[go: up one dir, main page]

EP2561180A2 - Device and method of enchancing production of hydrocarbons - Google Patents

Device and method of enchancing production of hydrocarbons

Info

Publication number
EP2561180A2
EP2561180A2 EP11714299A EP11714299A EP2561180A2 EP 2561180 A2 EP2561180 A2 EP 2561180A2 EP 11714299 A EP11714299 A EP 11714299A EP 11714299 A EP11714299 A EP 11714299A EP 2561180 A2 EP2561180 A2 EP 2561180A2
Authority
EP
European Patent Office
Prior art keywords
passage
flow
fluid
flow passage
internal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11714299A
Other languages
German (de)
French (fr)
Inventor
Øyvind STOKKA
Magnar Tveiten
Ståle PETTERSEN
Erling Kleppa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petroleum Technology Co AS
Original Assignee
Petroleum Technology Co AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petroleum Technology Co AS filed Critical Petroleum Technology Co AS
Publication of EP2561180A2 publication Critical patent/EP2561180A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/122—Gas lift
    • E21B43/123—Gas lift valves

Definitions

  • the present invention relates to a device and a method of use in a wellbore for oil and or gas production from a formation, preferably in relation to gas injection as a gas lift valve.
  • gas injection points will be provided at one or more points in the tubing, whereby the specific configuration is arranged for an optimal gas injection.
  • the gas lift valve(s) can then be controlled or checked according to several different principles, for example by a pressure, where it is the pressure differential round and/or across the valve which permits a controlled opening or closing of the valve.
  • An object with the present invention is to provide a device and an associated method which provide an alternative to normal gas lift valves, and operation of such, or an enhanced performance of a gas lift valve.
  • the present invention relates to a device and a method of use in a wellbore. More specifically it relates to a device and a method for injection of fluids into a wellbore to enhance the production from the well.
  • the device comprises an outer housing with two internal flow passages with separate inlets and a common outlet.
  • the inlets are preferably arranged in a distance from the outlet, with an elongation of the outer structure extending in a direction from the inlets to the outlet, where the passages extend in a longitudinal direction of the outer structure.
  • the inlets may also in one embodiment arranged at or close to one end of the device and the outlet at or close to the opposite end of the device, but other configurations are possible.
  • a device for enhancing the production of hydrocarbons in a wellbore comprising; an outer housing with two internal flow passages with separate inlets and a common outlet, a first flow passage fluidly connected to the inlet and in fluid communication with a main production flow from a wellbore, and a second flow passage comprising a pressure operated valve device, and where the second flow passage, downstream of the valve device, is leading to an ejector shaped part of the passages, forming an internal outlet of the second passage ending in the common outlet, where the device and passages are such configured that a fluid in the second passage acts as a driving fluid in the ejector shaped part in relation to the fluid in the first flow passage, and then out through the common outlet, and where the device is arranged in a side pocket mandrel, and that the device is configured for feeding a fraction of the production flow from the wellbore into the first flow passage, and means for feeding fluid into the second flow passage, through the inlet, and to mix the fraction flow with the fluid from the second flow
  • the inlet of the first passage in the device may preferably be positioned relatively below the outlet of the device, when the device is positioned in a mainly vertical part of a well. Or if not a vertical part of a well, the inlet of the device connected to a point in the well positioned upstream of a point connected to the common outlet of the device. By doing this, well fluid in the well may also be moved, as part of the well fluid upstream of the outlet drawn into the inlet of the device.
  • first passage downstream of the internal outlet of the second passage may be formed with increasing diameter towards the common outlet of the device.
  • Such a shape will further mix the components and create a larger area for inflow into the production tubing enhancing the effect of the gas injection in the well stream.
  • Some of the velocity in the mixed fluid will also in this part be converted to pressure in the flow as the flow decreases its velocity, thereby creating an increased pressure for introduction into the production tubing.
  • the common outlet may comprise one outlet.
  • the internal outlet of the second passage may be arranged centrally within the first passage.
  • the fluid in the first passage will in such a configuration mainly encircle the fluid flowing out of the outlet of the second passage at the internal outlet of the second passage.
  • the second passage in at least a part may be arranged within the first passage.
  • the first passage may in such an embodiment be formed by an annular space arranged around the second passage.
  • the first passage may be formed by one or more passages arranged around a centrally positioned second passage, for instance four, six or seven arranged spaced for instance evenly apart around a circumference, alternatively they may be grouped around the circumference.
  • the second passage may encircle the first passage.
  • the configuration of the different passages and internal outlet may vary dependent on the fluids to flow through the device and the production methods of the device.
  • the outer housing may comprise an outer sleeve element and an internal sleeve element, forming an annular space for the first flow passage, and the inner space of the sleeve element forms at least a part of the second flow passage.
  • the pressure operated valve device may comprise a valve seat formed by a surface of the sleeve element and a valve element arranged at least partly within the sleeve element.
  • the valve element may be moveably in the axial direction of the sleeve element.
  • the valve element itself may comprise an internal flow passage forming part of the second flow passage.
  • the flow in the second passage will then in an open state of the valve device flow in through the inlet and through a passage in the internal sleeve and in the inlet of the valve element through the internal passage in the valve element and out to a passage in the internal sleeve element and then through an annular passage between the internal sleeve element and the block element and then out through the internal outlet of the second passage and into the first flow passage.
  • the sleeve elements and sleeve part of valve element will have complementary shapes but they may have a mainly circular cross section, but they may also have another shaped cross section as triangular, rectangular, hexagonal, octagonal or generally multisided, or combinations. They may also have different shapes as long as they are complementary.
  • the annular sections of the first and second passage may have an even cross section around the circumference or an uneven cross section. It might in some embodiments also have a main annular shape, but which is not continued around a circumference, as for instance two halves.
  • the fluid within the first fluid passage is a well fluid
  • the fluid within the second passage is an injection fluid.
  • the device is configured such that an inlet of the first passage and the common outlet is connectable to the inside of the production tubing, and the inlet of the second passage is connectable to an injection fluid, for instance the annular space in a well, where the annular space is arranged to be pressurized by an injection fluid.
  • the injection fluid may be a gas and or water. There may be dedicated lines for injection fluids down to an inlet of the second passage.
  • the present invention relates thereby to a device for injection of different fluids in a well bore, where the device through its design will increase a production flow in a production tubing.
  • the device may also be used for injection of well stimulation fluids, water injection etc., in order to treat and/or stimulate the well and/or the production flow from the well.
  • the invention relates to a method of enhancing production of hydrocarbons from a wellbore by the use of the invented device, where the device is arranged in a side pocket mandrel and in that the method further includes the steps of; allowing a fraction of a main production flow to enter the first flow passage through an inlet and to mix with the fluid from the second flow passage, before returning the mixed flow to the main production flow.
  • the device comprises an outer hollow housing.
  • the outer housing may be produced in one single unit, or it can alternatively be composed of several connected parts, such as a main part, a nose and/or an extension part.
  • Inside the outer housing there may be arranged an internal body as a valve element in the second passage, where the internal body/valve element can be moved in a longitudinal direction of the outer housing.
  • the internal movable body comprises at least one inlet and outlet, where the at least one inlet and outlet is connected by an internal bore.
  • the internal bore may extend in the direction of movement of the internal body.
  • a seal system is provided between the outer hollow housing and the internal body.
  • the device may comprise a latch mechanism and sealing means connected to the side of the outer housing for positioning in a well.
  • the movement of the valve element/internal body is operated by pressure differential across the internal body.
  • the pressure differential is created by the device being subjected to a pressure acting on surfaces of the internal body, which surfaces may be exposed to the same or different fluids. These fluids may be well fluids or injection fluids on one side of the internal body and well fluid on the opposite side or combinations of these.
  • the pressure differential across the internal body may also be assisted by at least one predetermined pressure balanced elastic element in order to open and close the device.
  • Different parts forming the outer housing as nose/extension/sleeves/sleeve parts are connected to each other by appropriate means, for instance by threads, quick release coupling, detention sleeves etc. Furthermore, the different part may also be connected to each other by different means.
  • the outer structure may also be provided with one or more slots around its outer periphery along its length such as inlets to the first passage through the device, in order to allow a fluid to be imbibed into the device and/or to allow the fluid to be injected out of the device.
  • the one or more slots may be round, oval or elongated, where the slots are designed in relation to the fluids to be injected, well parameters, pressure etc., and also be formed to direct the flow through the slots.
  • the one or more outlets of the internal body and/or outer hollow housing may be longitudinal and distributed over the periphery of the inner body/valve element or outer housing of the device. The distribution may be evenly or unevenly around the periphery of the internal body/valve element and the outer hollow housing. The form of the outlets may be even or odd around the periphery.
  • the outlets may be longitudinal with a main longitudinal direction mainly parallel with a
  • the outlets may also be longitudinal with a main direction and at an angle relative to the longitudinal axis of the internal body or formed in a spiral or part of a spiral, or formed with another shape.
  • outlets in the internal body and/or outer housing may be made beveled and angled from an internal surface and towards an outer surface of the internal body and/or outer housing in order to obtain stream line flow from the internal bore and to the outside of the device.
  • Their function is to bring forth in the injected fluid the ability to penetrate the production flow in the tubing, thereby gaining a better incorporation of the injected fluid in the flow, in addition to the ejector effect in the device.
  • valve seat and the valve element sealing surface in an open or partially open position are positioned on opposite sides of an outlet, when seen in a longitudinal direction of the device.
  • the valve element sealing surface is positioned mainly outside the flow of injection fluid through the device, since it in an embodiment is at least partly covered by a part of the outer housing in the form of the internal sleeve of the outer housing.
  • the valve seat is positioned outside the flow of injection fluid through the device, at least partly covered by the valve element/internal body. This gives that the outlets of the second passage are positioned between the valve seat in the internal sleeve and the valve element sealing surface.
  • valve element may comprise a pressure surface exposed to the fluid in the first passage of the device, biasing the device towards a closed position.
  • the elastic element may comprise a spring element enclosed in a chamber, which chamber is filled with a fluid separate from the fluids both in the first and second passage of the device.
  • Fig. 1 shows a cross section of a first embodiment of the invention.
  • Fig. 2 shows the embodiment in fig. 1 in a closed state
  • Fig. 3 shows a second embodiment
  • Fig 4 is a schematic drawing of the invention arranged in a side pocket mandrel in a wellbore.
  • a valve device 30 in a second passage 20 of the device is shown in an open position (fig. 1) and a closed position (fig. 2).
  • the device comprises an outer housing 1 where through there is arranged two flow passages 10,20.
  • the first flow passage 10 extends from an inlet 1 1 in the wall of the outer housing 1 and along the housing 1 to an outlet 12 at an end of the housing 1.
  • the second flow passage 20 extends from an inlet 21 at an end of the housing 1 which is opposite to the outlet 12, to an internal outlet 22, positioned within the housing 1 and which leads into the first flow passage 10. This gives that the outlet 12 is a common outlet from the device for the two passages 10,20.
  • the outer housing 1 comprises an outer sleeve element 2 and within this an internal sleeve element 3 and within this sleeve element 3 an internal block element 4, all forming parts of the outer housing 1 and fixed relative each other.
  • the different elements forming the outer housing 1 may also be formed as one unit or of several parts.
  • the valve element 31 is formed with an internal passage 32, forming part of the second flow passage 20, which has an inlet 33 at one end of the valve element and outlets 34 leading from this internal passage 31 and out to the internal space of the inner sleeve element 31 and the annular passage between the inner sleeve element 3 and the block element 4.
  • the second flow passage 20 will therefore from the inlet 21 first be formed by the inner space of the inner sleeve 3 thereby through the inlet 33 and the internal passage 32 of the valve element 31 and out from this through outlets 34 and to the inner space of the inner sleeve 3 again and into the annular space between the inner sleeve 3 and the block element 4 and to the inner outlet 22.
  • the valve element 31 is arranged movable in the flow direction of the internal passage 32 of the valve element 31 , relative the inner sleeve 3 and thereby the outer housing 1.
  • an elastic element 36 between the valve element 31 and the inner sleeve 3, biasing the valve element 31 to one position.
  • the internal passage 32 is formed by a cylindrical shaped part of the valve element 31 , which is open in one end forming the inlet 33 and closed in the opposite end, close to the outlets 34.
  • the outlets 34 lead through the wall of the cylindrical shaped part.
  • the closed end of the internal passage 32 forms a pressure surface for pressure operating the valve element 31.
  • the closed end is formed by an end part of the valve element 31.
  • On the outside of the end part there is formed a sealing surface 35.
  • This sealing surface 35 is in a closed state of the device, as shown in fig. 2, in interaction with a valve seat 23 formed by a surface of the inner sleeve 3.
  • the valve element 31 is then moved axially relative the outer housing 1 .
  • the end part of the valve element 31 has an outer pressure surface 37 exposed to the fluid in the first flow passage 10 in a closed state of the valve device 30.
  • Part of this outer pressure surface 37 will interact with a stop surface 5 of the block element 4 in an open state of the valve device, thereby keeping the valve element 3 1 still.
  • the annular space between the inner sleeve 3 and the block element 4 is formed as a tapered flow passage part 25, which by its form increases the velocity of the fluid flowing through the second flow passage and out through the inner outlet 22.
  • the first flow passage 10 is from the inlet 1 1 formed with a first cylindrical shaped annular space between the inner sleeve 3 and the outer sleeve 2, followed by a tapered flow passage part 13 between the same sleeves until the internal outlet 22 of the second passage.
  • This will give that the fluid within the second flow passage will act as a driving fluid and create a suction pressure in the first flow passage 10, thereby draw fluid in through the first inlet 1 1 and into the first flow passage 10, and out through the common outlet 12.
  • the first flow passage 10 is downstream of the inner outlet 22 formed with a part 14 with an increasing diameter of the flow passage, as a truncated cone, towards the common outlet 12.
  • the larger diameter of the truncated cone is at the outlet 12. This will reduce the velocity of the mixed fluid and thereby increase the pressure of the mixed fluid before it exits the device through the common outlet 12.
  • the first flow passage 10 has in this embodiment an inlet 1 lb, closer to the outlet 12 compared to the embodiment shown in fig. l and fig. 2.
  • the inlet 1 lb leads more or less directly into a tapered flow passage part 13 upstream of the internal outlet 22 of the second flow passage 20.
  • Figure 4 shows a schematic view of the valve according to the invention arranged in a side pocket mandrel 40 in a wellbore 43, on the outside of the main production tubing 41 , and in fluid communication with the production fluid F in the main tubing 41.
  • At least a fraction Ffi of the production flow F enter the valve (1) through the at least one inlet 42 and mixes with gas in the valve such as to reduce the weight of the at least one fraction of the production flow, before the mixed production flow Ff2 returns to the main production flow through the at least one outlet 44, and mixes with the undisturbed, remaining fraction of the main
  • the amount of production flow entering the gas lift valve is dependent on several parameters including; the capacity of the topside compressor, the amount of injection gas, the temperature, and the depth of the side pocket mandrel.
  • the operator calculates the optimum size of the orifice installed in the valve dependent on the desired production rate. Said given parameters and the operator, decide the amount of production flow entering the valve as well as the amount of gas injected in the valve.
  • the embodiment of fig. 1 may in addition to the inlet 1 1 also have the inlet l ib arranged in relation to the first flow passage.
  • the valve device as explained in relation to the first embodiment one may instead for instance have a ball valve arranged within the inner sleeve.
  • the first flow passage within the second flow passage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Valve Housings (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Lift Valve (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

A device and an associated method, of enhancing production of hydrocarbons from a wellbore by the use of a device, where the device is arranged in a side pocket mandrel. The method, and associated device, includes means for allowing a fraction of a main production flow to enter a first flow passage (10) in the device through an inlet (11) and to mix with the fluid from a second flow passage (20) in the device, before returning the mixed flow to the main production flow.

Description

Device and method of enhancing production of hydrocarbons
The present invention relates to a device and a method of use in a wellbore for oil and or gas production from a formation, preferably in relation to gas injection as a gas lift valve.
There are some oil wells where the natural flow of hydrocarbons to the surface is not sufficient to permit or maintain commercial production. This may be due, for example, to the hydrocarbons' viscosity and/or weight, or the fact that the pressure in the oil well is too low to counteract the hydrostatic pressure of the fluid in the well together with the counter-pressure exerted on the fluid in the oil well by the processing installations.
For such oil wells a number of systems and different principles have therefore been developed which can increase the oil well's production by means of so-called artificial lifting. The two most commonly used systems today are water injection and gas injection. With gas injection natural gas under high pressure is injected into the annular space between the casing and the tubing. For this purpose a pressure- controlled valve, a so-called gas lift valve, is usually employed in order to be able to supply and control or check the amount of gas flowing into the actual production tubing. Pressure-controlled valves of this kind can also be used during a well startup phase, where completion fluid can be found in both the well's annulus and in the tubing. Another similar area of application will be after a well shut-in, where fluid has filled up at least parts of the annulus or where production fluid has lain for some time and gas has migrated to the surface and where the pressure in the well is too low for the well to begin producing without receiving pressure support from gas injection.
How these pressure-controlled valves are configured and located in the well will depend on a number of parameters. For example, according to the tubing's size (diameter) and the injection pressure available, so-called gas injection points will be provided at one or more points in the tubing, whereby the specific configuration is arranged for an optimal gas injection. The gas lift valve(s) can then be controlled or checked according to several different principles, for example by a pressure, where it is the pressure differential round and/or across the valve which permits a controlled opening or closing of the valve.
These known gas lift valves will inject gas into the production tubing. One problem associated with such injections is that gas is a relative low density fluid compared with the fluids normally in the production tubing. Thereby only a large amount or a high pressure will give the necessary boost of the fluid in the production tubing. It would be beneficial if one could achieve the lifting effect by the gas lift valves with less amount of, or with a lower pressure in the gas injected into the well. The known arrangements and systems will also only release a stream of high pressure gas into the production tubing, without controlling the stream's shape other than breaking the main injection stream into smaller streams and bubbles. Current release of high pressure gas like this may cause that a part of the stream of the high pressure gas may act against the production flow in the production tubing (i.e. the part of the stream will be injected in a downward direction in the production tubing), thereby decreasing the production flow. Hence leading to backflow or even inflow to the reservoir i.e. the injection pressure is working opposite of the natural flow direction
An object with the present invention is to provide a device and an associated method which provide an alternative to normal gas lift valves, and operation of such, or an enhanced performance of a gas lift valve.
This object is achieved with a device as indicated in the following independent claim, where further features of the invention will become evident from the dependent claims and the description below.
The present invention relates to a device and a method of use in a wellbore. More specifically it relates to a device and a method for injection of fluids into a wellbore to enhance the production from the well. The device comprises an outer housing with two internal flow passages with separate inlets and a common outlet. The inlets are preferably arranged in a distance from the outlet, with an elongation of the outer structure extending in a direction from the inlets to the outlet, where the passages extend in a longitudinal direction of the outer structure. The inlets may also in one embodiment arranged at or close to one end of the device and the outlet at or close to the opposite end of the device, but other configurations are possible. The invention describes: A device for enhancing the production of hydrocarbons in a wellbore, comprising; an outer housing with two internal flow passages with separate inlets and a common outlet, a first flow passage fluidly connected to the inlet and in fluid communication with a main production flow from a wellbore, and a second flow passage comprising a pressure operated valve device, and where the second flow passage, downstream of the valve device, is leading to an ejector shaped part of the passages, forming an internal outlet of the second passage ending in the common outlet, where the device and passages are such configured that a fluid in the second passage acts as a driving fluid in the ejector shaped part in relation to the fluid in the first flow passage, and then out through the common outlet, and where the device is arranged in a side pocket mandrel, and that the device is configured for feeding a fraction of the production flow from the wellbore into the first flow passage, and means for feeding fluid into the second flow passage, through the inlet, and to mix the fraction flow with the fluid from the second flow passage in the device, before the mixed flow is returned to the main production flow. According to one embodiment the first passage at the internal outlet of the second passage may be configured additionally such that a suction pressure is created in the fluid in the first passage when fluid in the second passage is flowing through the ejector shaped part and out of the internal outlet of the second passage.
By having such a device positioned for gas injection in the well, where the second passage is arranged in connection with the injection gas and the inlet of the first passage is arranged in fluid communication with the fluid in the production tubing and the outlet is leading into the production tubing, one may by pressurizing the injection gas, open the valve device in the second passage, and the injection gas will flow into the ejector shaped part and thereby create a suction pressure in the first passage and therefore in the well fluid, which will move well fluids through the first passage and pressurize it and mix it with the injection gas before it is let out into the production tubing, thereby creating a lift for the fluids in the production tubing. The inlet of the first passage in the device may preferably be positioned relatively below the outlet of the device, when the device is positioned in a mainly vertical part of a well. Or if not a vertical part of a well, the inlet of the device connected to a point in the well positioned upstream of a point connected to the common outlet of the device. By doing this, well fluid in the well may also be moved, as part of the well fluid upstream of the outlet drawn into the inlet of the device.
According to another aspect the first passage downstream of the internal outlet of the second passage may be formed with increasing diameter towards the common outlet of the device. Such a shape will further mix the components and create a larger area for inflow into the production tubing enhancing the effect of the gas injection in the well stream. Some of the velocity in the mixed fluid will also in this part be converted to pressure in the flow as the flow decreases its velocity, thereby creating an increased pressure for introduction into the production tubing.
According to another aspect the common outlet may comprise one outlet.
Alternatively there may be at least one, or several, outlets from the common outlet and out into a production tubing.
According to another aspect the internal outlet of the second passage may be arranged centrally within the first passage. The fluid in the first passage will in such a configuration mainly encircle the fluid flowing out of the outlet of the second passage at the internal outlet of the second passage. According to one embodiment the second passage in at least a part may be arranged within the first passage. The first passage may in such an embodiment be formed by an annular space arranged around the second passage. Alternatively the first passage may be formed by one or more passages arranged around a centrally positioned second passage, for instance four, six or seven arranged spaced for instance evenly apart around a circumference, alternatively they may be grouped around the circumference. In an alternative embodiment the second passage may encircle the first passage. The configuration of the different passages and internal outlet may vary dependent on the fluids to flow through the device and the production methods of the device.
According to another aspect there may be several inlets to the first flow passage. This will possibly give an easier inflow of fluids into the first flow passage of the device. There may also be only one inlet to the first flow passage.
According to another aspect the outer housing may comprise an outer sleeve element and an internal sleeve element, forming an annular space for the first flow passage, and the inner space of the sleeve element forms at least a part of the second flow passage. In one embodiment the pressure operated valve device may comprise a valve seat formed by a surface of the sleeve element and a valve element arranged at least partly within the sleeve element. In one embodiment the valve element may be moveably in the axial direction of the sleeve element. The valve element itself may comprise an internal flow passage forming part of the second flow passage. In such a configuration the flow in the second passage will then in an open state of the valve device flow in through the inlet and through a passage in the internal sleeve and in the inlet of the valve element through the internal passage in the valve element and out to a passage in the internal sleeve element and then through an annular passage between the internal sleeve element and the block element and then out through the internal outlet of the second passage and into the first flow passage. The sleeve elements and sleeve part of valve element will have complementary shapes but they may have a mainly circular cross section, but they may also have another shaped cross section as triangular, rectangular, hexagonal, octagonal or generally multisided, or combinations. They may also have different shapes as long as they are complementary. The annular sections of the first and second passage may have an even cross section around the circumference or an uneven cross section. It might in some embodiments also have a main annular shape, but which is not continued around a circumference, as for instance two halves.
According to one aspect the fluid within the first fluid passage is a well fluid, and the fluid within the second passage is an injection fluid. The device is configured such that an inlet of the first passage and the common outlet is connectable to the inside of the production tubing, and the inlet of the second passage is connectable to an injection fluid, for instance the annular space in a well, where the annular space is arranged to be pressurized by an injection fluid. According to an embodiment the injection fluid may be a gas and or water. There may be dedicated lines for injection fluids down to an inlet of the second passage.
The present invention relates thereby to a device for injection of different fluids in a well bore, where the device through its design will increase a production flow in a production tubing. As should be understood, the device may also be used for injection of well stimulation fluids, water injection etc., in order to treat and/or stimulate the well and/or the production flow from the well.
According to another aspect the invention relates to a method of enhancing production of hydrocarbons from a wellbore by the use of the invented device, where the device is arranged in a side pocket mandrel and in that the method further includes the steps of; allowing a fraction of a main production flow to enter the first flow passage through an inlet and to mix with the fluid from the second flow passage, before returning the mixed flow to the main production flow.
The device comprises an outer hollow housing. The outer housing may be produced in one single unit, or it can alternatively be composed of several connected parts, such as a main part, a nose and/or an extension part. Inside the outer housing there may be arranged an internal body as a valve element in the second passage, where the internal body/valve element can be moved in a longitudinal direction of the outer housing. The internal movable body comprises at least one inlet and outlet, where the at least one inlet and outlet is connected by an internal bore. The internal bore may extend in the direction of movement of the internal body. In order to close the at least one outlet of the internal body in a closed position of the device, a seal system is provided between the outer hollow housing and the internal body. Furthermore, the device may comprise a latch mechanism and sealing means connected to the side of the outer housing for positioning in a well.
The movement of the valve element/internal body is operated by pressure differential across the internal body. The pressure differential is created by the device being subjected to a pressure acting on surfaces of the internal body, which surfaces may be exposed to the same or different fluids. These fluids may be well fluids or injection fluids on one side of the internal body and well fluid on the opposite side or combinations of these. In one embodiment of the present invention the pressure differential across the internal body may also be assisted by at least one predetermined pressure balanced elastic element in order to open and close the device.
Different parts forming the outer housing as nose/extension/sleeves/sleeve parts are connected to each other by appropriate means, for instance by threads, quick release coupling, detention sleeves etc. Furthermore, the different part may also be connected to each other by different means.
The outer structure may also be provided with one or more slots around its outer periphery along its length such as inlets to the first passage through the device, in order to allow a fluid to be imbibed into the device and/or to allow the fluid to be injected out of the device. The one or more slots may be round, oval or elongated, where the slots are designed in relation to the fluids to be injected, well parameters, pressure etc., and also be formed to direct the flow through the slots. According to another aspect the one or more outlets of the internal body and/or outer hollow housing may be longitudinal and distributed over the periphery of the inner body/valve element or outer housing of the device. The distribution may be evenly or unevenly around the periphery of the internal body/valve element and the outer hollow housing. The form of the outlets may be even or odd around the periphery. The outlets may be longitudinal with a main longitudinal direction mainly parallel with a
longitudinal axis of the valve element. The outlets may also be longitudinal with a main direction and at an angle relative to the longitudinal axis of the internal body or formed in a spiral or part of a spiral, or formed with another shape.
According to another aspect the outlets in the internal body and/or outer housing may be made beveled and angled from an internal surface and towards an outer surface of the internal body and/or outer housing in order to obtain stream line flow from the internal bore and to the outside of the device. Their function is to bring forth in the injected fluid the ability to penetrate the production flow in the tubing, thereby gaining a better incorporation of the injected fluid in the flow, in addition to the ejector effect in the device.
According to another aspect of the invention the valve seat and the valve element sealing surface in an open or partially open position are positioned on opposite sides of an outlet, when seen in a longitudinal direction of the device. The valve element sealing surface is positioned mainly outside the flow of injection fluid through the device, since it in an embodiment is at least partly covered by a part of the outer housing in the form of the internal sleeve of the outer housing. The valve seat is positioned outside the flow of injection fluid through the device, at least partly covered by the valve element/internal body. This gives that the outlets of the second passage are positioned between the valve seat in the internal sleeve and the valve element sealing surface.
According to another aspect of the invention the valve element may comprise a pressure surface exposed to the fluid in the first passage of the device, biasing the device towards a closed position.
According to another aspect of the invention the elastic element may comprise a spring element enclosed in a chamber, which chamber is filled with a fluid separate from the fluids both in the first and second passage of the device.
The present invention will now be explained with a non-limiting embodiment with reference to the enclosed figures, where;
Fig. 1 shows a cross section of a first embodiment of the invention.
Fig. 2 shows the embodiment in fig. 1 in a closed state,
Fig. 3 shows a second embodiment, Fig 4 is a schematic drawing of the invention arranged in a side pocket mandrel in a wellbore.
In fig. 1 and 2 there is shown a first embodiment where a valve device 30 in a second passage 20 of the device is shown in an open position (fig. 1) and a closed position (fig. 2).
The device comprises an outer housing 1 where through there is arranged two flow passages 10,20. The first flow passage 10 extends from an inlet 1 1 in the wall of the outer housing 1 and along the housing 1 to an outlet 12 at an end of the housing 1. The second flow passage 20 extends from an inlet 21 at an end of the housing 1 which is opposite to the outlet 12, to an internal outlet 22, positioned within the housing 1 and which leads into the first flow passage 10. This gives that the outlet 12 is a common outlet from the device for the two passages 10,20. The outer housing 1 comprises an outer sleeve element 2 and within this an internal sleeve element 3 and within this sleeve element 3 an internal block element 4, all forming parts of the outer housing 1 and fixed relative each other. The different elements forming the outer housing 1 may also be formed as one unit or of several parts. There is between the outer sleeve element 2 and the inner sleeve element 3 formed an annular passage, forming part of the first flow passage 10. There is also between the inner sleeve element 3 and the inner block element 4 formed an annular space forming part of the second flow passage 20. There is within the inner sleeve element 3 also arranged a valve element 31 , formed with a mainly sleeve shaped part and an end part. The valve element 31 is formed with an internal passage 32, forming part of the second flow passage 20, which has an inlet 33 at one end of the valve element and outlets 34 leading from this internal passage 31 and out to the internal space of the inner sleeve element 31 and the annular passage between the inner sleeve element 3 and the block element 4. The second flow passage 20 will therefore from the inlet 21 first be formed by the inner space of the inner sleeve 3 thereby through the inlet 33 and the internal passage 32 of the valve element 31 and out from this through outlets 34 and to the inner space of the inner sleeve 3 again and into the annular space between the inner sleeve 3 and the block element 4 and to the inner outlet 22.
The valve element 31 is arranged movable in the flow direction of the internal passage 32 of the valve element 31 , relative the inner sleeve 3 and thereby the outer housing 1. There is arranged an elastic element 36 between the valve element 31 and the inner sleeve 3, biasing the valve element 31 to one position. The internal passage 32 is formed by a cylindrical shaped part of the valve element 31 , which is open in one end forming the inlet 33 and closed in the opposite end, close to the outlets 34. The outlets 34 lead through the wall of the cylindrical shaped part. The closed end of the internal passage 32 forms a pressure surface for pressure operating the valve element 31. The closed end is formed by an end part of the valve element 31. On the outside of the end part there is formed a sealing surface 35. This sealing surface 35 is in a closed state of the device, as shown in fig. 2, in interaction with a valve seat 23 formed by a surface of the inner sleeve 3. The valve element 31 is then moved axially relative the outer housing 1 .In a closed state the end part of the valve element 31 , has an outer pressure surface 37 exposed to the fluid in the first flow passage 10 in a closed state of the valve device 30. Part of this outer pressure surface 37 will interact with a stop surface 5 of the block element 4 in an open state of the valve device, thereby keeping the valve element 3 1 still.
The annular space between the inner sleeve 3 and the block element 4 is formed as a tapered flow passage part 25, which by its form increases the velocity of the fluid flowing through the second flow passage and out through the inner outlet 22. The first flow passage 10 is from the inlet 1 1 formed with a first cylindrical shaped annular space between the inner sleeve 3 and the outer sleeve 2, followed by a tapered flow passage part 13 between the same sleeves until the internal outlet 22 of the second passage. This gives an ejector shaped part l a of the outer housing in addition to the shape of the elements forming the second flow passage which gives an ejector functionality of the device around the inner outlet 22. This will give that the fluid within the second flow passage will act as a driving fluid and create a suction pressure in the first flow passage 10, thereby draw fluid in through the first inlet 1 1 and into the first flow passage 10, and out through the common outlet 12.
In the shown embodiment the first flow passage 10 is downstream of the inner outlet 22 formed with a part 14 with an increasing diameter of the flow passage, as a truncated cone, towards the common outlet 12. The larger diameter of the truncated cone is at the outlet 12. This will reduce the velocity of the mixed fluid and thereby increase the pressure of the mixed fluid before it exits the device through the common outlet 12.
In fig. 3 there is shown a second embodiment with several similar features to the first embodiments, and only the differences will be explained. The first flow passage 10 has in this embodiment an inlet 1 lb, closer to the outlet 12 compared to the embodiment shown in fig. l and fig. 2. The inlet 1 lb, leads more or less directly into a tapered flow passage part 13 upstream of the internal outlet 22 of the second flow passage 20.
Figure 4 shows a schematic view of the valve according to the invention arranged in a side pocket mandrel 40 in a wellbore 43, on the outside of the main production tubing 41 , and in fluid communication with the production fluid F in the main tubing 41. At least a fraction Ffi of the production flow F enter the valve (1) through the at least one inlet 42 and mixes with gas in the valve such as to reduce the weight of the at least one fraction of the production flow, before the mixed production flow Ff2 returns to the main production flow through the at least one outlet 44, and mixes with the undisturbed, remaining fraction of the main
production flow. By doing this, the overall weight of the production flow is reduced due to the gas mixed in the flow, and the transportation of the production fluids to the surface becomes easier.
The amount of production flow entering the gas lift valve is dependent on several parameters including; the capacity of the topside compressor, the amount of injection gas, the temperature, and the depth of the side pocket mandrel. The operator calculates the optimum size of the orifice installed in the valve dependent on the desired production rate. Said given parameters and the operator, decide the amount of production flow entering the valve as well as the amount of gas injected in the valve.
The invention has now been explained with reference to two different embodiments. A skilled person will understand that there may be made alterations and
modifications to these embodiments that are within the scope of the invention as defined in the following claims. In another embodiment the embodiment of fig. 1 may in addition to the inlet 1 1 also have the inlet l ib arranged in relation to the first flow passage. Instead of a valve device as explained in relation to the first embodiment one may instead for instance have a ball valve arranged within the inner sleeve. There is also the possibility of arranging the first flow passage within the second flow passage.

Claims

1. A device for enhancing the production of hydrocarbons in a wellbore, comprising; an outer housing (1) with two internal flow passages (10, 20) with separate inlets (11,21) and a common outlet (12), a first flow passage (10) fluidly connected to the inlet (11) and in fluid communication with a main production flow from a wellbore, and a second flow passage (20) comprising a pressure operated valve device (30), and where the second flow passage (20), downstream of the valve device (30), is leading to an ejector shaped part (la) of the passages (10, 20), forming an internal outlet (22) of the second passage (20) ending in the common outlet (12), where the device and passages (10,20) are such configured that a fluid in the second passage (20) acts as a driving fluid in the ejector shaped part (la) in relation to the fluid in the first flow passage (10), and then out through the common outlet (12), and where the device is arranged in a side pocket mandrel
characterized in that the device is configured for feeding a fraction of the production flow from the wellbore into the first flow passage (10), and means for feeding fluid into the second flow passage (20), through the inlet (11), and to mix the fraction flow with the fluid from the second flow passage (20) in the device, before the mixed flow is returned to the main production flow.
2. Device according to claim 1, wherein the first passage (10) at the internal outlet (22) of the second passage (20) is configured such that a suction pressure is created in the fluid in the first passage (10) when fluid in the second passage (20) is flowing through the ejector shaped part (la) and out of the internal outlet (22) of the second passage (20).
3. Device according to claim 1 or 2, wherein the first passage (10), downstream of the internal outlet (22) of the second passage (20), is formed with increasing diameter towards the common outlet (12) of the device.
4. Device according to one of the proceeding claims, wherein the common outlet (12) comprises at least one or several outlets.
5. Device according to one of the proceeding claims, wherein the internal outlet (22) of the second passage (20) is arranged centrally within the first passage
(10).
6. Device according to one of the proceeding claims, wherein the second passage (20) in at least a part is arranged within the first passage (10).
7. Device according to one of the proceeding claims, wherein there are several inlets (11) to the first flow passage (10).
8. Device according to one of the proceeding claims, wherein the outer housing (1) comprises an internal sleeve element (3), forming an annular space for the first flow passage (10), and the inner space of the sleeve element (3) forms at least a part of the second flow passage (20).
9. Device according to claim 8, w h e r e i n the pressure operated valve device comprises a valve seat (23) formed by a surface of the sleeve element (3) and a valve element (31) is arranged within the sleeve element (3) and moveably in the axial direction of the sleeve element (3), where the valve element (31) comprises an internal flow passage (32) forming part of the second flow passage (20).
10. Device according to one of the proceeding claims, wherein a fluid within the first fluid passage (10) is a well fluid, and a fluid within the second passage (20) is an injection fluid.
11. Device according to claim 7, wherein the injection fluid is a gas and or water.
12. Method of enhancing production of hydrocarbons from a wellbore by the use of the device of claims 1-11,
characterized in that the method includes the steps of; allowing a fraction of a main production flow to enter a first flow passage (10) through an inlet (11) and to mix with the fluid from a second flow passage (20), before returning the mixed flow to the main production flow.
EP11714299A 2010-04-21 2011-04-14 Device and method of enchancing production of hydrocarbons Withdrawn EP2561180A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20100573A NO20100573A1 (en) 2010-04-21 2010-04-21 Laryngeal Pump Valve
PCT/EP2011/055894 WO2011131551A2 (en) 2010-04-21 2011-04-14 Device and method of enchancing production of hydrocarbons

Publications (1)

Publication Number Publication Date
EP2561180A2 true EP2561180A2 (en) 2013-02-27

Family

ID=44625819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11714299A Withdrawn EP2561180A2 (en) 2010-04-21 2011-04-14 Device and method of enchancing production of hydrocarbons

Country Status (9)

Country Link
US (1) US20130094975A1 (en)
EP (1) EP2561180A2 (en)
AU (1) AU2011244454A1 (en)
BR (1) BR112012027003A2 (en)
CA (1) CA2796551A1 (en)
MX (1) MX2012012124A (en)
NO (1) NO20100573A1 (en)
SG (1) SG184872A1 (en)
WO (1) WO2011131551A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20111228A1 (en) 2011-09-09 2013-03-11 Petroleum Technology Co As Device for side pocket almond
WO2014039740A1 (en) * 2012-09-08 2014-03-13 Schlumberger Canada Limited Gas lift valve
US9453398B1 (en) * 2013-07-02 2016-09-27 The University Of Tulsa Self-stabilizing gas lift valve
CA2950237C (en) * 2014-07-28 2023-08-15 Petroleum Technology Company As Gas lift valve

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665955A (en) * 1970-07-20 1972-05-30 George Eugene Conner Sr Self-contained valve control system
US4504195A (en) * 1981-06-30 1985-03-12 Armco Inc. Jet pump for oil wells
WO1992008037A1 (en) 1990-11-03 1992-05-14 Peco Machine Shop & Inspection Services Ltd. Downhole jet pump system using gas as driving fluid
US5562161A (en) * 1995-04-27 1996-10-08 Hisaw; Jack C. Method for accelerating production
US6148843A (en) * 1996-08-15 2000-11-21 Camco International Inc. Variable orifice gas lift valve for high flow rates with detachable power source and method of using
GB2342670B (en) * 1998-09-28 2003-03-26 Camco Int High gas/liquid ratio electric submergible pumping system utilizing a jet pump
BR0100140B1 (en) * 2001-01-23 2010-10-19 pneumatic pump valve with central body venturi.
BR0300958B1 (en) * 2003-04-15 2013-06-04 chuck for pneumatic pump valve.
GB2429071B (en) * 2004-07-05 2008-11-05 Shell Int Research Monitoring fluid pressure in a well and retrievable pressure sensor assembly for use in the method
US7228909B2 (en) * 2004-12-28 2007-06-12 Weatherford/Lamb, Inc. One-way valve for a side pocket mandrel of a gas lift system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011131551A2 *

Also Published As

Publication number Publication date
SG184872A1 (en) 2012-11-29
NO20100573A1 (en) 2011-10-24
BR112012027003A2 (en) 2016-07-19
MX2012012124A (en) 2012-11-21
CA2796551A1 (en) 2011-10-27
AU2011244454A1 (en) 2012-12-06
US20130094975A1 (en) 2013-04-18
AU2011244454A2 (en) 2012-12-20
WO2011131551A3 (en) 2012-03-08
WO2011131551A2 (en) 2011-10-27

Similar Documents

Publication Publication Date Title
AU2011216607B2 (en) Valve system
US5806599A (en) Method for accelerating production
US10982514B2 (en) Tubing and annular gas lift
US8893799B2 (en) Subsurface safety valve including safe additive injection
EP2561180A2 (en) Device and method of enchancing production of hydrocarbons
US4083660A (en) Gas drive oil well pumping system having mixing means for the gas/oil mixture
RU2576729C1 (en) Apparatus for simultaneous separate operation of several deposits at same well (versions)
RU115408U1 (en) INSTALLATION FOR SIMULTANEOUSLY SEPARATE DEVELOPMENT OF TWO OPERATING OBJECTS ONE WELL
EP2181247B1 (en) Stealth orifice
US20220298898A1 (en) System for gas lift
CN107110181B (en) Counter flow jet pump
AU2015295629B2 (en) Gas lift valve
US9470074B2 (en) Device and method for improving gas lift
CA3036153C (en) Tubing and annular gas lift
EP2142757B1 (en) Power lift generator
CN205445570U (en) Water jet fracturing tubular column device
RU156571U1 (en) JET PUMP
RU64276U1 (en) PIPE LINING OF THE ORIENTAL FITTING OF THE EXPLOSIVE WELL
US2350472A (en) Intermitter
RU2633852C2 (en) Method of simultaneous-separate production of well fluid and injection of liquid into well and ejector plant for its implementation (versions)
CN204252949U (en) A kind of novel high-pressure adjuster
CA3077809A1 (en) Tubing and annular gas lift
WO2021091370A1 (en) Device and method for regulating pressure
WO2014197848A1 (en) Device and method for improving gas lift
CN106151670A (en) A kind of control valve of progressively buffer traffic

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20121121

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20141031