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EP2041477A1 - Pipe string device for conveying a fluid from a well head to a vessel - Google Patents

Pipe string device for conveying a fluid from a well head to a vessel

Info

Publication number
EP2041477A1
EP2041477A1 EP07793921A EP07793921A EP2041477A1 EP 2041477 A1 EP2041477 A1 EP 2041477A1 EP 07793921 A EP07793921 A EP 07793921A EP 07793921 A EP07793921 A EP 07793921A EP 2041477 A1 EP2041477 A1 EP 2041477A1
Authority
EP
European Patent Office
Prior art keywords
pipe string
fluid
vessel
well head
accordance
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Withdrawn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
EP07793921A
Other languages
German (de)
French (fr)
Inventor
Roger Stave
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.)
AGR Subsea AS
Original Assignee
AGR Subsea 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 AGR Subsea AS filed Critical AGR Subsea AS
Publication of EP2041477A1 publication Critical patent/EP2041477A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/12—Conveying liquids or viscous products by pressure of another fluid
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
    • 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
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems

Definitions

  • Pipe string device for conveying a fluid from a well head to a vessel.
  • This invention relates to a pipe string. More particularly, it relates to a pipe string for conveying a fluid from a well head to a vessel, in which, for well-technical reasons, the fluid located in the pipe string needs to be given a flow boost, and in which the pipe string is provided along its length with at least one injection point for a driving fluid.
  • the injection point may be formed by a fluid-operated ejector.
  • the invention also includes a method of using the device .
  • drilling fluid which is adapted for the conditions in the well with respect to density and viscosity, among other things. It is common, for example, to use drilling fluid having a density of approximately 1.6 kg/1.
  • US patent 6745851 deals with work of this kind and discloses a pump-operated solution which can recover and recirculate the drilling fluid.
  • the head from the drilling vessel down to the well formation may become so great that drilling fluid penetrates into the formation.
  • Such a flow of drilling fluid into the formation is unfortunate both because relatively expensive drilling fluid is lost, but also because an inflow of this kind may reduce the future productivity of a well.
  • a method which has gained some ground in offshore wells involves the drilling fluid being pumped, as it is returning from the borehole, out at the well head on the sea floor, then flowing back to the vessel via a separate pipe.
  • the static pressure in the borehole can be controlled, for example by controlling the liquid head in the riser, if such is installed, between the well head and vessel.
  • NO patent 319213 discloses a method directed towards controlling the liquid pressure in the well by filling the upper portion of the riser with a fluid having a different density relative to the density of the drilling fluid.
  • the invention has as its object to remedy or to reduce at least one of the drawbacks of the prior art.
  • a pipe string in accordance with the invention for conveying a fluid from a well head to a vessel, in which the fluid located in the pipe string needs, for well-technical reasons, to be given a flow boost, is characterized by the pipe string being provided along its length with at least one injection point for a driving fluid.
  • the injection point is most advantageously constituted by a fluid-operated ejector.
  • One such injection point or more can be disposed at suitable intervals along the pipe string from the sea floor and up to the vessel.
  • the pipe string forms a separate flow path relative to a possible riser.
  • the injection point is constituted by an ejector
  • a possible ejector located above will relieve the ejector located below, so that this ejector starts a flow feeding the ejector located above with fluid.
  • a pump may be arranged, pumping the fluid through the pipe string, one or more ejectors at the upper portion of the pipe string forming auxiliary apparatuses for a sufficient flow rate through the pipe string to be achieved.
  • the driving fluid has a lower density than the fluid located in the pipe string.
  • the overall liquid pressure within the fluid string at the sea floor will be reduced.
  • the gas may expand as it rises in the pipe string, thereby further reducing the overall liquid pressure within the pipe string at the sea floor .
  • the pipe string may be anchored on the sea floor and be provided with buoyancy bodies at its upper portion, or it may be suspended from the vessel which then carries the weight of the pipe string.
  • the device and method according to the invention may provide a satisfactory flow rate in the pipe string, even with the use of a pipe string of a relatively small diameter.
  • FIG. 1 shows schematically a vessel which is provided with a. pipe string in accordance with the invention.
  • Figure 2 shows the invention in an alternative embodiment .
  • the reference numeral 1 indicates a pipe string which is connected at its lower end portion to a well head 2 on the sea floor 4, and which is connected at its upper end portion to a separator 6.
  • the separator 6 is located on a vessel 8.
  • the vessel 8 is typically carrying out work in a well 10 in the ground and is connected to the well 10 by means of a pipe connection 12 extending through the well head 2.
  • the pipe connection 12 may comprise, in a manner known per se, one or more of drill pipe, marine riser, work riser or other well intervention tools.
  • the pipe string 1 is anchored on the sea floor 4 by means of an anchor 14. At its upper portion, near the sea surface 16, is arranged a buoyancy body 18 which is arranged to take the weight of the pipe string 1.
  • the pipe string 1 is provided with fluid-operated ejectors 20 suitably spaced apart, which are supplied with driving fluid from the vessel 8 via at least one driving-fluid pipe 22.
  • the fluid enters the separator 6, in which possible driving gases are separated from the rest of the fluid before the remaining fluid flows on for treatment in, for example, screening machines, not shown.
  • the return pressure at the well head 2 can be controlled by adjusting the driving-fluid pressure into the ejectors 20.
  • a mechanically working pump 24 is arranged at the lower portion of the pipe string 1.
  • the ejectors 20, which are arranged at the upper portion of the pipe 1, are used here to increase the flow rate through the pipe string 1 beyond that effected by the pump 24 on its own.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Public Health (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Earth Drilling (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Pipeline Systems (AREA)

Abstract

A method and pipe string device (1) for conveying a fluid from a well head (2) to a vessel (8), the fluid in the pipe string (1) needing, for well-technical reasons, to be given a flow boost, and the pipe string (1) being provided with at least one injection point for a driving fluid, the injection point may be constituted by an ejector (20).

Description

T/NO2007/000269
Pipe string device for conveying a fluid from a well head to a vessel.
This invention relates to a pipe string. More particularly, it relates to a pipe string for conveying a fluid from a well head to a vessel, in which, for well-technical reasons, the fluid located in the pipe string needs to be given a flow boost, and in which the pipe string is provided along its length with at least one injection point for a driving fluid. The injection point may be formed by a fluid-operated ejector. The invention also includes a method of using the device .
In the drilling for and recovery of petroleum it is necessary, for drilling- and well-technical reasons, to use a well fluid which is adapted for the conditions in the well with respect to density and viscosity, among other things. It is common, for example, to use drilling fluid having a density of approximately 1.6 kg/1.
During the first phase of the drilling it has previously been common to use "disposable drilling fluid" and deposit the effluent cuttings on the sea floor, which is unfavourable to the environment and which also means increased costs .
US patent 6745851 deals with work of this kind and discloses a pump-operated solution which can recover and recirculate the drilling fluid. In drilling at great depths offshore, the head from the drilling vessel down to the well formation may become so great that drilling fluid penetrates into the formation. Such a flow of drilling fluid into the formation is unfortunate both because relatively expensive drilling fluid is lost, but also because an inflow of this kind may reduce the future productivity of a well.
A method which has gained some ground in offshore wells involves the drilling fluid being pumped, as it is returning from the borehole, out at the well head on the sea floor, then flowing back to the vessel via a separate pipe.
In this way the static pressure in the borehole can be controlled, for example by controlling the liquid head in the riser, if such is installed, between the well head and vessel.
NO patent 319213 (WO2005052307) discloses a method directed towards controlling the liquid pressure in the well by filling the upper portion of the riser with a fluid having a different density relative to the density of the drilling fluid.
At relatively great sea depths, at which the return pipe necessarily is long, the necessary pump pressure at the sea floor is relatively high because of the density and viscosity of the drilling fluid. It has turned out to be difficult to achieve the necessary flow rate without having to use pipes of a relatively large diameter, which entails increased pipe weight and thereby considerably higher investment costs.
The invention has as its object to remedy or to reduce at least one of the drawbacks of the prior art.
The object is achieved through features specified in the description below and in the claims that follow.
A pipe string in accordance with the invention for conveying a fluid from a well head to a vessel, in which the fluid located in the pipe string needs, for well-technical reasons, to be given a flow boost, is characterized by the pipe string being provided along its length with at least one injection point for a driving fluid.
The injection point is most advantageously constituted by a fluid-operated ejector.
One such injection point or more can be disposed at suitable intervals along the pipe string from the sea floor and up to the vessel. The pipe string forms a separate flow path relative to a possible riser.
When the injection point is constituted by an ejector, a possible ejector located above will relieve the ejector located below, so that this ejector starts a flow feeding the ejector located above with fluid.
Alternatively, a pump may be arranged, pumping the fluid through the pipe string, one or more ejectors at the upper portion of the pipe string forming auxiliary apparatuses for a sufficient flow rate through the pipe string to be achieved.
Typically, the driving fluid has a lower density than the fluid located in the pipe string. Thus, on injection of a second fluid the overall liquid pressure within the fluid string at the sea floor will be reduced.
If the second fluid comprises a gas, the gas may expand as it rises in the pipe string, thereby further reducing the overall liquid pressure within the pipe string at the sea floor .
The pipe string may be anchored on the sea floor and be provided with buoyancy bodies at its upper portion, or it may be suspended from the vessel which then carries the weight of the pipe string.
The device and method according to the invention may provide a satisfactory flow rate in the pipe string, even with the use of a pipe string of a relatively small diameter.
In what follows is described an example of a preferred embodiment and method which are visualized in the accompanying drawings, in which:
Figure 1 shows schematically a vessel which is provided with a. pipe string in accordance with the invention; and
Figure 2 shows the invention in an alternative embodiment .
In the drawings the reference numeral 1 indicates a pipe string which is connected at its lower end portion to a well head 2 on the sea floor 4, and which is connected at its upper end portion to a separator 6. The separator 6 is located on a vessel 8.
The vessel 8 is typically carrying out work in a well 10 in the ground and is connected to the well 10 by means of a pipe connection 12 extending through the well head 2. Dependent on the operations involved, the pipe connection 12 may comprise, in a manner known per se, one or more of drill pipe, marine riser, work riser or other well intervention tools.
The pipe string 1 is anchored on the sea floor 4 by means of an anchor 14. At its upper portion, near the sea surface 16, is arranged a buoyancy body 18 which is arranged to take the weight of the pipe string 1. The pipe string 1 is provided with fluid-operated ejectors 20 suitably spaced apart, which are supplied with driving fluid from the vessel 8 via at least one driving-fluid pipe 22.
When a fluid is to be brought to flow through the pipe string 1 from the well head 2 , the pressure fluid supply via the driving-fluid pipe 22 from the vessel 8 to the ejectors 20 is opened. The flow starts by each ejector 20 supplying the necessary pressure to the fluid until the fluid flows to the next ejector along the pipe string 1.
At the vessel 8 the fluid enters the separator 6, in which possible driving gases are separated from the rest of the fluid before the remaining fluid flows on for treatment in, for example, screening machines, not shown.
The return pressure at the well head 2 can be controlled by adjusting the driving-fluid pressure into the ejectors 20.
In an alternative embodiment, see figure 2, a mechanically working pump 24 is arranged at the lower portion of the pipe string 1. The ejectors 20, which are arranged at the upper portion of the pipe 1, are used here to increase the flow rate through the pipe string 1 beyond that effected by the pump 24 on its own.

Claims

C l a i m s
1. A pipe string device (1) for conveying a fluid from a well head (2) to a vessel (8), the fluid located in the pipe string (1) needing, for well-technical reasons, to be given a flow boost, c h a r a c t e r i z e d i n that the pipe string (1) is provided with at least one injection point for a driving fluid.
2. The device in accordance with claim 1, c h a r a c - t e r i z e d i n that the injection point is constituted by a fluid-operated ejector (20).
3. The device in accordance with claim 1, c h a r a c t e r i z e d i n that a mechanically working pump (24) is connected to the pipe string (1) .
4. The device in accordance with claim 1, c ha r a c t e r i z e d i n that the pipe string (1) leads into a separator tank (6) on the vessel (8).
5. The device in accordance with claim 1, c h a r a c t e r i z e d i n that the pipe string (1) is anchored on the sea floor (4) by means .of an anchor (14) and provided with a buoyancy body (18) near the sea surface (16) .
6. The device in accordance with claim 1, c h a r a c t e r i z e d i n that the pipe string (1) is suspended from the vessel (8) and connected to the well head (2) by means of a flexible connection.
7. A method of providing flow assistance to a fluid located in a pipe string (1) , the fluid, being conveyed by means of the pipe string (1) from a well head (2) to a vessel (8), c ha r a c t e r i z e d i n that the pipe string (1) is supplied with a driving fluid at least at one injection point located on the pipe string (1) .
The method in accordance with claim 7, c h a r a c t e r i z e d i n that at the injection point there is supplied a driving fluid which has a lower specific gravity than the fluid located in the pipe string.
EP07793921A 2006-07-14 2007-07-13 Pipe string device for conveying a fluid from a well head to a vessel Withdrawn EP2041477A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20063269A NO325931B1 (en) 2006-07-14 2006-07-14 Device and method of flow aid in a pipeline
PCT/NO2007/000269 WO2008007973A1 (en) 2006-07-14 2007-07-13 Pipe string device for conveying a fluid from a well head to a vessel

Publications (1)

Publication Number Publication Date
EP2041477A1 true EP2041477A1 (en) 2009-04-01

Family

ID=38923461

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07793921A Withdrawn EP2041477A1 (en) 2006-07-14 2007-07-13 Pipe string device for conveying a fluid from a well head to a vessel

Country Status (7)

Country Link
US (1) US20100006297A1 (en)
EP (1) EP2041477A1 (en)
BR (1) BRPI0714138A2 (en)
CA (1) CA2657557A1 (en)
MX (1) MX2009000458A (en)
NO (1) NO325931B1 (en)
WO (1) WO2008007973A1 (en)

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Also Published As

Publication number Publication date
WO2008007973A1 (en) 2008-01-17
MX2009000458A (en) 2009-01-27
BRPI0714138A2 (en) 2012-12-25
NO20063269L (en) 2008-01-15
US20100006297A1 (en) 2010-01-14
CA2657557A1 (en) 2008-01-17
NO325931B1 (en) 2008-08-18

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