WO2011159187A1 - Installation for extracting gasified liquid - Google Patents

Abstract

The installation can be used for raising water, oil and condensate from oil wells. The installation for extracting gasified liquid is constructed on the basis of pneumatic well-drilling substitute pumps having working chambers alternately connected to a low- and high-pressure working-gas source, in the form of a vacuum-compressor unit. Each pump is additionally provided with a central pipe for removing exhaust and casing-head gases. The pipe is an integral part of a through pipeline for removing the exhaust and casing-head gases, which pipeline is connected via a supporting connecting pipe of a supporting flange, which is mounted hermetically on the flange of a drive pipe, to the input of the vacuum-compressor unit. The extracted liquid pipeline is in composite form and comprises a receiving part, pump working chambers, an intermediate part and an extracted liquid connecting pipe, which is connected via the supporting flange to a trunk pipeline. The supporting flange is additionally equipped with a connecting pipe with a pressure control valve which is connected to the pipeline for the casing-head gas and to a compressed-gas-supply connecting pipe which is connected to the output of the vacuum-compressor unit.

Description

 PLANT FOR PRODUCTION OF CARBON LIQUID

 Installation for the production of carbonated liquid refers to technical means for lifting liquids designed to work in a gas environment of high pressure, made on the basis of borehole replacement pumps, and can be used in any industry for lifting water, oil, condensate from boreholes.

 The well-known "Pump" according to patent RU 2295065 6t 2005.02.07, published 2007.03.10, IPC F04F 1/04, which contains a cylinder with a bottom equipped with a suction valve and filter, and a head with an inlet pipe connected to the air pipe, and also the output a pipe that is hermetically connected by welding or threaded connection to the liquid pipe, and is equipped with a check valve. Pipelines are placed in the casing, the free end of the liquid pipe is in communication with the capacity of the cycle frequency controller. The pump is equipped with a compressor and a vacuum pump. The cylinder is made in the form of a piece of casing, rigidly connected with the end surface of the lower end of the casing, in which the pipelines are placed. The free end of the air pipe is hermetically connected to the compressor outlet pipe and in parallel to the vacuum pump inlet pipe. There are sensors with the ability to interact with the cycle frequency controller, as well as transmit signals to turn on and off the compressor and the vacuum pump to the control panel.

 This pump can only be used when lifting water from shallow depths. It is difficult to manufacture and maintain, as the working elements are made and mounted as a unit with the casing. It has low productivity due to the presence of only one working chamber, so the supply of liquid to the surface will not be continuous, but cyclic. It cannot be used for multi-stage lifting of fluid from a well.

 Also known are deep-well sucker-rod pumps (SHG) (Oil production reference book. Authors: V.V. Andreev, K.R. Urazakov, V.U. Dalimov et al .; Edited by K.R. Urazakov, M. LLC “ Nedra-Business Center ”, 2000, chapter 5).

SHGN is expensive in manufacturing due to the use of high alloy steels and high-precision machining in manufacturing. Sufficiently stringent requirements for tubing used in rod production pumps, make the production and operation of SHGN expensive. SHGN has rather stringent requirements for the content of mechanical impurities in the produced fluid (up to 3.5 g / l), as well as for the content of free gas (up to 25%). The strength of the rods and their deformation limit the depth of application of the SHGN to 3200 m.

 As a result of fluid production at the SHGN, increased wear of the parts of the downhole pump, as well as the breakage of the rods, is observed, so frequent repairs are necessary.

 The closest technical solution is the "Pneumatic replacement pump" according to patent RU 2016258 of 1991.07.01, published 1994.07.15, IPC 5 F04F 1/02. It contains working chambers, alternately connected by means of a distribution mechanism to sources of high and low pressure of the working gas and equipped with suction and discharge pipes with suction and discharge valves. At the same time, the discharge valve is float-operated and differs in that the source of high and low pressure is made in the form of a vacuum compressor unit with air distribution boxes connected to the distribution mechanism. Electric type distribution mechanism. One of the chambers is equipped with a double-fused contact closure of the distribution mechanism contact, while the vacuum-compressor unit is in communication with each of the working chambers through valve boxes through two pipelines. The suction valve is also float-operated, and the suction and discharge valves are made with a variable buoyancy value.

 The pump is intended only for pumping liquid on the surface and cannot be used when lifting liquid from wells, it has a bulky and unreliable control system.

 The objective of the proposed technical solution is to create a borehole replacement pump, simple to manufacture and maintain, reliable in operation, electrically safe, with a maximum working pressure of not more than 1.0 MPa, providing a rise in carbonated liquid with a high content of mechanical impurities and associated gas in single-stage and multi-stage lifting fluid.

The problem is solved by the installation for the production of carbonated liquid, made on the basis of borehole pneumatic displacement pumps having working chambers, alternately connected to a source of high and low working gas pressure, in the form of a vacuum compressor unit, in addition, each pump is additionally equipped with a central exhaust pipe and associated gas, which is an integral part of a through pipe for exhaust, exhaust and associated gases, connected through a carrier pipe of the carrier flange mounted tightly on the flange casing pipe, to the inlet of the vacuum compressor unit; the pipeline of the produced fluid is made integral and contains a receiving part, working chambers of the pumps, an intermediate part and a branch pipe of the produced fluid, through a bearing flange connected to the main pipeline; the supporting flange is additionally equipped with a nozzle with an overpressure valve connected to the associated gas pipeline and a compressed gas supply nozzle connected to the outlet of the vacuum compressor unit.

 Equipping each pump with an additional central exhaust and associated gas exhaust pipe, which is an integral part of the through pipe for exhaust, exhaust and associated gases connected through a supporting flange to the inlet of the vacuum compressor unit, allows the creation of exhaust and associated gases in the pipeline by pumping gases reduced pressure allows you to increase the depth of fluid production by increasing the number of pumps suspended over a certain distance.

 Providing the supporting flange with an additional compressed gas supply pipe connected to the outlet of the vacuum compressor unit, an inlet connected to the exhaust and associated gas piping allows re-supplying the exhaust and associated gases to the annulus of the well to create high pressure, the energy of which is used in the lifting process liquids.

The execution of the pipeline of the produced fluid as a component of the receiving part, the working chambers of the pumps, the intermediate part and the upper part with the pipe of the produced fluid located on the supporting flange and connected to the main pipeline allows fluid to be received into the working chambers of the lower pump with subsequent displacement of the adjacent upper stage to the pump along the intermediate part of the pipeline, which in turn displaces further upwards, thus, to the upper pump, which in turn displaces through the nozzle ok produced fluid in the main pipeline. The supply of the supporting flange with an additional pipe with an overpressure valve allows you to remove excess associated gas from the produced fluid and creating excess pressure from the annular space of the well into the associated gas pipeline.

 Installation for the production of carbonated liquid based on borehole displacement pumps is shown in the drawings, Fig. 1 is a diagram of a multi-stage installation, Fig. 2 is an external view of a borehole displacement pump, Fig. 3 is a schematic diagram of a borehole displacement pump, Fig. 4 is a diagram of a bearing flange, 5, 6 and 7 - the operating procedure of the well substitution pumps.

Figure 1, 2, 3, 4, 5, 6, and 7 show: casing 1 of the well, perforations 2 of the casing, produced fluid 3, borehole displacement pumps 4, carrying pipe 5 for exhaust and associated gases, pipe 6 production fluid lifting, receiving pipe 7, intermediate cable 8, plug 9 of the lower socket of the borehole substitution pump power supply for the lower stage, casing pipe flange 10, bearing pump flange 11, gasket 12, supporting pipe 13, produced fluid pipe 14 , pipe 15 of compressed gas, vacuum compressor unit 16, electrical cabinet 17, outlet pipe 18 of a vacuum compressor unit, pipe 19 of compressed gas, electrical connector 20, electrical connector 21, main pipe 22, central pipe 23, pneumatic distributor 24, receiving pipe 25, discharge pipe 26, lower electrical connector 27, upper electrical connector 28, filter nozzle 29, downhole pump power cable 30, vacuum compressor unit power cable 31, line 32 el power supply, inlet pipe 33 of the vacuum compressor unit, connecting pipe 34, overpressure pipe 35, overpressure valve 36, associated gas pipe 37, breather 38, control section 39 of the downhole displacement pump, main section 40 of the downhole displacement pump, valve section 41 of the downhole displacement pump, first working chamber 42, second working chamber 43, float chamber 44 of the first working chamber, float chamber 45 of the second working chamber, first double-acting magnetic float valve 46, second meter double-acting solenoid float valve 47, seat 48 of the first working chamber, seat 49 of the second working chamber, upper seat 50 of the first working chamber, upper saddle 51 second working chamber, reed switch level sensor 52 of the first chamber, reed switch level sensor 53 of the second chamber, receiving valve 54 of the first working chamber, receiving valve 55 of the second working chamber, pressure valve 56 of the first working chamber, pressure valve 57 of the second working chamber, receiving channel 58 Channel 59 injection, through wire 60 of the power circuit, wire 61 of the power supply of the control unit, wire 62 of the control of the first electromagnet of the valve, control wire 63 of the second electromagnet of the valve, water 64 reed sensor of the first working chamber, wire 65 reed sensor of the second working chamber, hole 66 for exhaust gas, channel 67 for exhaust gas, channel 68 for supplying and discharging working gas to the first working chamber, channel 69 for supplying and discharging the working gas into the second working chamber, the control electronic unit 70, the compressed gas channel 71, the coupling 72, the suspension rod 73 of the receiving pipe, the intermediate wire 74, the compressed gas supply valve 75, the compressed gas filling valve 76, the control gauge valve 77, the control ny manometer 78, mounting holes 79, 80 discharge.

Installation for the production of carbonated liquid based on borehole displacement pumps is as follows. In figure 1 in the casing 1 of the well, equipped with perforations 2, immersed in the produced fluid 3, are located downhole displacement pumps 4 of the lower stage. To the upper end of the central pipe 23, the discharge pipe 26 and to the electrical connector 28 of the borehole replacement pump are connected detachably, respectively, a carrier pipe for exhaust gas 5, a pipe for lifting the produced fluid 6 and an electric cable 8. To the receiving pipe 25, also detachable, is connected to the receiving pipe 7 with a filter nozzle 29, which is attached to the lower end of the central pipe 23 by means of a suspension rod 73 and a sleeve 72, which seals the exhaust pipe 5. Hermetically receiving tube can be any, but at least 10 meters, and depends only on what depth of the need to raise the liquid. A plug 9 is installed on the lower electrical connector 27, which is installed only on the bottom stage substitution pump. The electric cable 8 is detachably connected to the upper electrical connector 28 of the downhole substitution pump 4 and the lower electrical connector 27 of the downhole pump of the next stage 4, and the discharge pipe 26 of the lower stage pump is detachably connected to the receiving pipe 25 of the upper stage pump through the intermediate part of the produced fluid pipe 6, the upper end of the lower pump central pipe 23 is connected detachably to the lower end of the central pipe of the upper pump by the supporting pipe 5. All well intermediate stage replacement pumps for multi-stage production. Connections of the borehole pump substitution 4 upper stage; the carrier pipe 5, the pipeline for lifting the produced fluid 6 and the electric cable 8 are detachably connected, respectively, with the supporting pipe 13, the produced fluid pipe 14 and the electrical connector 20 which are located on the supporting flange 11. The supporting flange 11 is mounted on the flange of the casing 10 and tightened with bolts (not shown in the drawing). To prevent the leakage of compressed working gas from the annulus of the well, a gasket 12 is installed. The pipe of the produced fluid 14 is detachably connected to the main pipe 22. To the overpressure pipe 35 with an overpressure valve 36 a detachable associated gas pipe 37 is connected. The inlet pipe 33 of the vacuum compressor unit 16 connected detachably to the supporting pipe 13 by means of a connecting pipe 34. To the connector 21 is connected a cable 30 of the power supply of the downhole replacement pumps with the other end of the connection ny to the cabinet 17. The electrical cabinet K 17 connected to the electric same vacuum compressor unit 16 via cable 31. Power supply installation is carried out on the power supply line 32.

The bearing flange of the well pump for producing carbonated liquid (Fig. 4) is an assembly unit consisting of a flange 11 and hermetically assembled on it: an overpressure pipe for the working gas 35 with an overpressure valve 36 through which excess associated gas released from fluid into the annulus through the associated gas pipeline 37, a carrier 13, designed to hold downhole displacement pumps with pipelines and electric cable, simultaneously serving for exhaust gas removal to the vacuum compressor unit, the produced fluid pipe 14 detachably connected to the main pipe 22, the compressed gas pipe 15 used to supply compressed gas to the annulus of the well, connected detachably to the valve 75 on the outlet pipe of the vacuum compressor unit 16 by means of a compressed gas pipeline 19. Electrical connectors 20 and 21 are also located on the carrier flange 11, which are interconnected by an intermediate wire 74 sealed therein. An outlet 80 is located on the compressed gas pipe 15, on which a valve 77 with a control pressure gauge 78 and a compressed gas filling valve 76 of the installation are mounted to create increased pressure in the annulus of the well before starting work.

 The number of installation steps for multi-stage lifting depends only on the depth with which it is necessary to raise the fluid and the step with which the well substitution pumps are mounted is determined by the formula:

 n = H / h

 where n is the number of installation steps

 H - the depth with which it is necessary to raise the liquid

 h is the step with which the well substitution pumps of the installation are mounted (5-50 m.).

 When installing the installation for the production of carbonated liquid, the downhole substitution pump of the lower stage is lowered to the required depth, with a single-stage lift up to 50 m, with multi-stage up to 5000 m and deeper, it is necessary to observe the condition that the immersion depth of the downhole replacement pump in the liquid is 5-25 m. Below its static level in the well. In this case, the length of the receiving pipe can be any, and depends on how deep it is necessary to raise it from the static level of the liquid in the well.

 Before turning on the mounted installation, it is necessary to create an increased working gas pressure in the annulus of the well (Fig. 1). Increased pressure in the annulus is created by injection of compressed associated gas. For this purpose, a hose for supplying compressed gas from another source to the annular space (not shown) is connected to the filling valve 76. When pumping compressed gas into the well, valve 75 is closed and valve 76 is opened. Gas control is carried out using a pressure gauge 78, with valve 77 open. Upon reaching the required gas pressure in the annulus of the well, valve 76 must be closed and the filling hose disconnected from it.

When filling a well with associated gas in the annulus create increased pressure (up to 1.0 MPa) (Fig. 1), under the influence of which the static liquid level in the well will decrease, and the downhole substitution pump for the lower stage 4 will be higher than the liquid level. Accordingly, the gas entering one of the working chambers (FIG. 3) of the borehole displacement pump through the breather 38, the compressed gas channel 71, the air distributor 24 and the channels 68 or 69, depending on the position of the air distributor 24, will displace the liquid from the working chamber 42 or 43 into the pipeline of produced fluid 6. At the same time, the float valve 46 or 47 will lower and block the seats 48 or 49, thereby preventing leakage of compressed gas into the pipeline of produced fluid 6. The second working chamber at this time remains filled with fluid. In the installation (Fig. 1), after filling a well, compressed gas will also fill one of the working chambers of the well pump for replacing all intermediate stages. After the gas pressure in the annulus of the well reaches its maximum working value (1.0 MPa), the well pumping unit is ready for operation.

 Installation for the production of carbonated liquid works as follows:

Open valve 75, Turn on the vacuum compressor unit 16 which pumps the exhaust and associated gases from the exhaust and associated gas pipeline into the annulus of the well, creating a low pressure in it. At the same time, an electric current of 24 V. is supplied to the borehole displacement pumps 4, as a result of which the installation starts to work. At the time of the supply of electricity to control the borehole displacement pumps in the annulus is gas under high pressure (figure 5). Gas is also located in the working chamber 42, and the other working chamber 43 is filled with liquid. The float valve 47, in the upper position, closes the seat 51 and thereby prevents liquid from entering the exhaust gas pipe 5, and the magnet built into it includes a reed switch 53. The pressure in the exhaust gas pipe 5 is low, since high pressure gas the start-up of the well substitution pump does not have access there. When power is supplied via cable 8, the reed switch 53 gives a signal via wire 65 to control unit 70, which generates a command and transmits it via wire 63 to switch the air distributor 24. After switching the air distributor 24 (Fig. 6), compressed gas begins to flow from chamber 43 from annular space through the breather 38 through the channel 71 and 69 and displaces the liquid in the pipeline 6 through the seat 49, the discharge valve 57 and through the channel 59 into the pipeline of the produced fluid 6 to the upper stage pump. When the process of displacing the liquid from the chamber 43 is completed, the float valve 47 closes the seat 49, preventing the leakage of compressed air. At the same time, compressed gas is removed from the chamber 42 into the exhaust gas pipe 5 through channels 68 and 67 through a pneumatic distributor 24, as a result of a decrease in pressure, pressure fluid enters the chamber under pressure through the seat 48, valve 54 and through the receiving channel 58 from the receiving pipe 7. At this time, when filling the chamber 42, the float valve 46, floating up, closes the seat 50, at the same time closing the reed switch 52, as a result of which the pneumatic distributor 24 switches. After switching the pneumatic distributor 24 (Fig. 7), compressed ha h and displaces the liquid through the seat 48 and valve 56 into the discharge channel 59 and then into the pipeline 6 to the upper stage pump. At this time, compressed gas is removed from the chamber 43 into the exhaust gas pipe 5, and liquid enters the chamber through the seat 49, valve 55 and through the channel 58 from the intake pipe 7. All the pumps of the intermediate stages work similarly as soon as one of the working chambers is filled with liquid lower stage pump, until this moment they are in standby mode. Thus, by continuously alternating the intake and displacement cycles in the working chambers 42 and 43, the well substitution pumps create a continuous liquid flow in the produced fluid pipe 6, which rises to the surface and is pumped further along the main pipe 22. The exhaust gas is pumped out through the exhaust gas pipe 5 vacuum - compressor unit 16, which pumps it back into the annulus, thereby maintaining pressure in it, this process is carried out automatically. Associated gas generated during the production of carbonated liquid creates excess pressure in the annulus of the well and is removed into the associated gas pipe 37 through an overpressure valve 36. The downhole pumping unit for producing carbonated liquid works until the power is turned off.

The borehole replacement pump of any intermediate stage is designed to receive from the lower bottom and rise to the neighboring upper produced fluid, and the top to rise to the surface. Borehole displacement pump of any stage begin to work only when one of the working chambers YU

it will fill the produced fluid raised by the lower well displacement pump, and until that moment they are in standby mode. The principle of operation of all borehole pumps for the equivalent installation is the same. All borehole displacement pumps for soda production are interchangeable.

 The working pressure of the gas used during operation of the installation may exceed

1.0 MPa in case the well substitution pumps, pipelines and other components are manufactured in a reinforced version.

 In the installation for producing carbonated liquid, borehole substitution pumps are used that are specially designed for working in high pressure gas environment and for their operation in the annular space of the well they create increased associated gas pressure before starting work, which is maintained during operation due to its circulation. Associated gas is circulated by a vacuum compressor unit, which continuously pumps it from the exhaust gas pipeline into the annulus of the well. In the process of production associated gas is released from the carbonated liquid, and this leads to an increase in pressure in the annulus of the well above the working one. To remove associated gas from the annulus of the well into the associated gas pipeline and thereby prevent associated gas from being released into the atmosphere, an overpressure pipe with an overpressure valve is sealed on the carrier flange.

The technical effect is the creation of a borehole replacement pump, simple to manufacture and maintain, reliable in operation, electrically safe, with a maximum working pressure of not more than 1.0 MPa, which provides a rise in carbonated liquid with a high content of mechanical impurities and associated gas during a single-stage and multi-stage liquid lifting , due to the installation for the production of carbonated liquid, made on the basis of borehole pneumatic displacement pumps having working chambers, are alternately connected to a source of high and low pressure of the working gas, in the form of a vacuum compressor unit, in addition, each pump is additionally equipped with a central exhaust pipe and associated gas, which is an integral part of a through pipe for exhaust, exhaust and associated gases connected through a carrier pipe of the bearing flange installed tightly on the casing flange to the inlet of the vacuum compressor unit; produced fluid pipeline integral and contains a receiving part, working chambers of the pumps, an intermediate part and a nozzle of the produced fluid, through a bearing flange connected to the main pipeline; the supporting flange is additionally equipped with a nozzle with an overpressure valve connected to the associated gas pipeline and a compressed gas supply nozzle connected to the outlet of the vacuum compressor unit.

Claims

FORMULA  Installation for producing carbonated liquid, made on the basis of borehole pneumatic displacement pumps having working chambers alternately connected to a source of high and low pressure of the working gas, in the form of a vacuum compressor unit, characterized in that each pump is additionally equipped with a central exhaust pipe and associated gases, which is an integral part of the through pipeline for exhaust, exhaust and associated gases, connected through the carrier pipe of the carrier flange installed tightly on the casing flange, to the inlet of the vacuum compressor unit; the pipeline of the produced fluid is made integral and contains a receiving part, working chambers of the pumps, an intermediate part and a branch pipe of the produced fluid, through a bearing flange connected to the main pipeline; the supporting flange is additionally equipped with a nozzle with an overpressure valve connected to the associated gas pipeline and a compressed gas supply pipe connected to the outlet of the vacuum compressor unit.