Gas well injection liquid drawing device

Abstract

The utility model discloses a gas well injection liquid drawing device, and relates to the technical field of natural gas field exploitation, in particular to a gas well injection liquid drawing device which comprises an injection liquid drawing assembly, a starting assembly and a locating assembly, the injection liquid drawing assembly comprises an injection liquid drawing assembly body and a shell, and the injection liquid drawing assembly can slide between two limiting intervals; when the driving fluid is sprayed out from the nozzle at a high speed, negative pressure is generated in the mixing chamber and the liquid drawing channel; the technology has the advantages that on one hand, the technology has the advantages of being high in liquid drainage efficiency, low in use cost, easy to maintain, convenient to operate and the like, and the recovery efficiency of a natural gas well can be remarkably improved; and on the other hand, the structure can be independently used and also supports advanced deployment, and when the pressure and the yield of an air layer are reduced and seepage liquid in a shaft is difficult to continue and effectively discharge, the injection liquid drawing assembly can be put into the well-entering seating assembly and is started.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas field exploitation, in particular to a gas well injection liquid pumping device. Background Art

[0002] After a natural gas well has been producing for a certain period of time, the formation pressure gradually decreases. Under the conventional oil-casing structure, the natural gas itself cannot bring the excess formation fluid out of the wellbore. When the wellbore is flooded with liquid to a certain height, liquid column pressure is formed, which hinders the output of natural gas and seriously affects natural gas production.

[0003] In the prior art, the gas lift process is usually used to solve the above problems. The gas lift process is an important drainage and gas production technology after conventional pipe string drainage, foam drainage, plunger drainage, rod pump drainage, screw pump drainage and electric submersible pump drainage. Conventional gas lift valves are placed in sequence in the vertical well section flooded with liquid in the drainage and production pipe string, and gas is injected into the annulus of the casing from the ground, and the accumulated liquid in the vertical well section is brought out of the wellbore from top to bottom through high-pressure gas circulation.

[0004] In this type of downhole tubular structure, the tubing shoe is the connection point between the oil casing and the oil casing during lifting. When the tubing shoe is lowered to a deep position, a high wellhead pumping pressure is required, which requires a high compressor grade. If the compressor pressure grade needs to be reduced, it is generally necessary to pull out the production tubing to connect downhole tools such as a gas lift valve or a jet pump, which makes the process complicated. Secondly, the continuous gas lift mode of laying the gas injection pipeline and the production pipeline in the same trench between the wellhead and the gas gathering station has problems such as large investment, high management and maintenance costs, and low equipment utilization for gas wells with low reservoir grade and small remaining recoverable reserves.

[0005] Based on this, the utility model provides a gas well ejection and pumping device, a pipe column including the same, and a construction process, which can effectively suck out the accumulated liquid at the bottom of the well and realize efficient liquid drainage and gas production in the oil and gas well. Utility Model Content

[0006] The utility model aims to provide a gas well injection pumping device to solve the above problems.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A gas well ejection pumping device comprises an ejection pumping assembly and a starting assembly, wherein the ejection pumping assembly comprises an ejection pumping assembly body and a shell, wherein the shell is a tubular structure, wherein the shell is provided with an air inlet hole, and wherein limit blocks are provided at both ends of the inner wall, wherein the ejection pumping assembly is sleeved in the shell, and the ejection pumping assembly can slide between the two limit blocks;

[0009] The ejector and liquid drawing assembly includes an ejector, a drainage channel and a liquid drawing channel. The ejector also includes a nozzle and a mixing chamber. The drainage channel is arranged on the side of the ejector and liquid drawing assembly and is connected to the nozzle. The liquid drawing pipe is connected to the mixing chamber. When the nozzle ejects the fluid at a high speed, negative pressure is generated in the mixing chamber and the liquid drawing pipe.

[0010] When the ejection and liquid drawing component slides to the liquid inlet end of the shell, the drainage channel and the air inlet hole are connected, and when it is at the non-liquid inlet end of the shell, the drainage channel and the air inlet hole are disconnected; the starting component is arranged between the shell and the ejection and liquid drawing component, and is used to fix the ejection and liquid drawing component to the non-liquid inlet end of the shell.

[0011] Furthermore, it comprises a seating component, a side wall of which is provided with a through hole, a sleeve is slidably provided in the seating component, and an elastic component is provided at one end of the sleeve to enable the sleeve to cover the through hole.

[0012] Furthermore, after the ejection and pumping assembly is inserted into the seating assembly, an anti-retraction device is provided at the corresponding position.

[0013] Furthermore, sealing rings are provided at both ends of the sleeve.

[0014] Furthermore, a check valve is provided in the air inlet.

[0015] Furthermore, the starting component is provided with an easy-to-break layer at the junction of the shell and the ejection and liquid-drawing component.

[0016] Furthermore, connection structures for connecting the continuous oil pipe are provided at both ends of the shell.

[0017] Furthermore, connection structures for connecting oil pipes are provided at both ends of the seating assembly.

[0018] Furthermore, it comprises a sealing rubber tube, the through holes are arranged in two, the sealing rubber tube is sleeved on the seating component and arranged between the two through holes.

[0019] Furthermore, a slit screen tube and / or a rupture disk is provided at the lower part of the liquid drawing pipe.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] The utility model creatively proposes not to use the conventional gas lift process, but to change it to an ejector to deal with the problem of insufficient energy downhole. The ejector is a device that uses a high-speed and high-energy flow (liquid flow, air flow or other material flow) to eject another low-speed and low-energy flow. The jet bursts into the mixing chamber through a contraction-shaped nozzle, and is surrounded by the ejected flow. Through the mixing effect of the boundary, the ejected flow transfers energy to the ejected flow. The mixing zone formed by the mixing gradually expands and fills the entire mixing chamber. After a period of mixing, the flow becomes almost a uniform flow at the outlet of the mixing chamber. Usually there is also a diffuser at the back to reduce the flow rate and increase the static pressure.

[0022] Through the injection technology, on the one hand, this technology has the characteristics of high drainage efficiency, low use cost, simple maintenance, and easy operation, which can significantly improve the recovery rate of natural gas wells. On the other hand, this structure also supports early deployment. When the formation energy is reduced and is not enough to carry the liquid in the well, you can choose to lower and start the injection device. In this way, the advantage is that you don’t need to lift the oil pipe, you can directly lower the injection liquid pumping component to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the first embodiment of the utility model;

[0024] Figure 2 This is a diagram of the overall structure of the first embodiment of the utility model installed on the oil pipe;

[0025] Figure 3 This is a schematic diagram of the structure of the liquid extraction component of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the seating assembly of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the utility model after the ejection and liquid drawing component is lowered into the seating component;

[0028] Figure 6 It is a structural schematic diagram of the utility model after the ejection and pumping assembly is lowered into the seating assembly and the starting pin is opened;

[0029] Figure 7 It is a structural schematic diagram of the third embodiment of the present utility model.

[0030] Markings in the figure:

[0031] 1-injection and liquid drawing assembly, 2-starting assembly, 3-housing, 4-limiting block, 5-injector, 6-drainage channel, 7-liquid drawing tube, 8-nozzle, 9-mixing chamber, 10-air inlet, 11-seat assembly, 12-through hole, 13-sleeve, 14-elastic component, 15-anti-retraction device, 16-sealing ring, 17-check valve, 18-breakable layer, 19-connecting structure, 20-sealing rubber cylinder. DETAILED DESCRIPTION

[0032] The utility model is described in detail below in conjunction with the accompanying drawings.

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] Embodiment 1:

[0035] In this embodiment, if Figure 1 , Figure 2 As shown, a gas well ejection pumping device comprises: an ejection pumping assembly 1 and a starting assembly 2, the ejection pumping assembly 1 comprises an ejection pumping assembly 1 body and a shell 3, the shell 3 is a tubular structure, the shell 3 is provided with an air inlet 10, and limit blocks 4 are provided at both ends of the inner wall, the ejection pumping assembly 1 is sleeved in the shell 3, and the ejection pumping assembly 1 can slide between the two limit blocks 4;

[0036] The ejector and liquid drawing assembly 1 includes an ejector 5, a drainage channel 6 and a liquid drawing tube 7. The ejector 5 also includes a nozzle 8 and a mixing chamber 9. The drainage channel 6 is arranged on the side of the ejector and liquid drawing assembly 1 and is connected to the nozzle 8. The liquid drawing tube 7 is connected to the mixing chamber 9. When the nozzle 8 sprays at a high speed, negative pressure is generated in the mixing chamber 9 and the liquid drawing tube 7.

[0037] When the ejection and liquid drawing component 1 slides to the liquid inlet end of the housing 3, the drainage channel 6 and the air inlet hole 10 are connected, and when it is at the non-liquid inlet end of the housing 3, the drainage channel 6 and the liquid inlet hole 10 are disconnected; the starting component 2 is arranged between the housing 3 and the ejection and liquid drawing component 1, and is used to fix the ejection and liquid drawing component 1 to the non-liquid inlet end of the housing 3;

[0038] Specifically, when the downhole pressure is insufficient, the housing 3 is connected between two sections of continuous tubing through the connecting structure 19. The connecting structure 19 adopts a threaded connection method. The ejector and pumping assembly 1 is lowered into the well together with the continuous tubing. A soluble ball is placed through the wellhead. After the ball is pumped into place, the pressure is held up to shear off the starter assembly 2. Alternatively, the pressure is held up at the wellhead directly. The starter assembly 2 is sheared off from the easy-to-break layer 18 under the action of the throttling pressure of the ejector 5. After the starter assembly 2 is sheared off, the body of the ejector and pumping assembly 1 moves toward the liquid inlet end relative to the housing 3 under the action of the wellhead pressure. Movement, the drainage channel 6 is connected with the air inlet hole 10, and the liquid and / or gas outside the oil pipe are introduced into the nozzle 8. The nozzle 8 accelerates the liquid and / or gas outside the oil pipe to spray into the mixing chamber 9. Negative pressure is generated in the mixing chamber 9, and the liquid and / or gas in the oil pipe at the liquid inlet end are sucked from the liquid suction pipe 7 connected to the bypass, so as to further draw downhole natural gas through the ejector 5 under the condition of insufficient downhole pressure. This 90 has the characteristics of high drainage efficiency, low use cost, simple maintenance, convenient operation, etc., and can significantly improve the recovery rate of natural gas wells.

[0039] Embodiment 2

[0040] Based on the first embodiment, Figure 4 As shown, further, it includes a seating component 11, a through hole 12 is provided on the side wall of the seating component 11, a sleeve 13 is slidably provided in the seating component 11, and an elastic component 14 is provided at one end of the sleeve 13 to enable the sleeve 13 to cover the through hole 12;

[0041] Specifically, the sleeve 13 is set in a cylindrical shape, matching the inner wall of the seating component 11, a slide groove is set on the inner wall of the seating component 11, a coil spring is set in the slide groove, and a convex block is set on the outer wall of the sleeve 13, which can limit the sliding of the sleeve 13 in the slide groove and play a limiting role. At the same time, the coil spring can support the convex block so that it is always kept at one end of the slide groove. When the seating component 11 is installed on the oil pipe, the sleeve 13 can always be kept at one end of the slide groove so that it blocks the through hole 12 on the seating component 11 to prevent the through hole 12 from penetrating into the oil pipe;

[0042] Preferably, when lowering the oil pipe, the seating assembly 11 can be connected to the oil pipe in advance and lowered into the well together. When the pressure in the well is sufficient in the early stage, the seating assembly 11 becomes a part of the oil pipe and is used normally. When the pressure in the well is insufficient in the later stage, the oil pipe does not need to be lifted out. After the situation in the well is understood, the injection and pumping assembly 1 can be directly lowered to perform the injection operation. This is convenient and fast, saves manpower and material resources, and greatly improves the working efficiency of the gas well.

[0043] Further, such as Figure 5 As shown, after the ejection and pumping assembly 1 is inserted into the seating assembly 11, an anti-retraction device 15 is provided at the corresponding position;

[0044] Specifically, an anti-retraction block is provided at the liquid outlet end of the seating component 11, and the anti-retraction block is installed on the inner wall groove of the first working cylinder through a latch, and the anti-retraction block can rotate around the latch, and a corresponding anti-retraction groove is provided at a corresponding position of the ejection and liquid drawing component 1. When the ejection and liquid drawing component 1 is inserted into the seating component 11, the anti-retraction block is stuck in the anti-retraction groove to prevent it from moving toward the liquid outlet end, and is firmly fixed in the seating component 11 with the cooperation of the lower end sleeve 13;

[0045] Specifically, when the injection and liquid drawing component 1 is stuck in the anti-retraction block, the sleeve 13 is pushed to the extreme position, which can fix the injection and liquid drawing component 1 to prevent it from continuing to move toward the liquid inlet end, so that it is fixed in the seating component 11, ensuring that it is stable and reliable during operation, providing effective injection and liquid drawing function, and improving gas production efficiency.

[0046] Furthermore, sealing rings 16 are provided at both ends of the sleeve 13; when the seating assembly 11 is not inserted into the ejection and pumping assembly 1, sealing rings 16 are provided at both ends of the sleeve 13 that blocks the through hole 12 to prevent substances outside the pipeline from penetrating into the oil pipe through the through hole 12;

[0047] Furthermore, a check valve 17 is provided in the air inlet 12; the check valve 17 is provided in the air inlet 12 so that the flow direction in the air inlet 12 can only flow from outside the pipeline to inside the pipeline. In this way, the material in the pipeline can be prevented from leaking outward, and the sealing of the pipeline can be further strengthened, thereby improving the efficiency of the injection and suction of liquid.

[0048] Furthermore, the starter assembly 2 is provided with an easy-to-break layer 18 at the junction of the housing 3 and the ejection and liquid-drawing assembly 1; in this embodiment, the starter assembly 2 is made of metal material to ensure its strength and corrosion resistance when not in use. At the same time, the easy-to-break layer 18 is provided on the starter assembly 2, and the easy-to-break layer 18 is made of metal or other composite materials with low rigidity. When in use, the easy-to-break layer 18 is located at the junction of the housing 3 and the ejection and liquid-drawing assembly 1, so that the starter assembly 2 can be easily disconnected from the easy-to-break layer 18 when the starter assembly 2 needs to be disconnected;

[0049] Specifically, grooves are provided at positions corresponding to the outer shell 3 and the ejection and suction assembly 1, and the starter assembly 2 is installed in the two grooves. The advantage of using the grooves is that they are relatively sealed to prevent external liquid from seeping in or internal liquid from leaking.

[0050] Furthermore, connection structures 19 for connecting to the coiled tubing are provided at both ends of the housing 3; the ejector assembly 1 used in the first embodiment is used to directly connect to the coiled tubing, and adopts a connection method of internal and external threads.

[0051] Furthermore, connection structures 19 for connecting to oil pipes are provided at both ends of the seating component 11; the seating component 11 used in the second embodiment is used to directly connect to the oil pipe, and adopts a connection method of internal thread and external thread.

[0052] Specifically, this arrangement allows the ejector and pumping assembly 1 to be salvaged for maintenance by a salvage tool when a failure occurs in the ejector and pumping assembly 1. The salvage assembly can open the anti-retraction block and be lifted out from the wellhead for maintenance or replacement. The advantage of this arrangement is that maintenance can be carried out without removing the entire string of oil pipes, thereby improving the working efficiency of the gas well and reducing manpower and material costs.

[0053] Embodiment 3

[0054] Further, such as Figure 7As shown, it includes a sealing rubber tube 20, and two through holes 12 are set. The sealing rubber tube 20 is sleeved on the seating component 11 and is set between the two through holes 12; the sealing rubber tube 20 is made of a liquid-expanding material. When the formation energy is insufficient, the sealing rubber tube 20 expands when it encounters liquid, so that the sealing rubber tube 20 is against the inner wall of the gas well, and the annulus between the oil pipe and the casing is divided into an upper and lower part. One through hole 12 is located at the liquid inlet end part divided by the sealing rubber tube 20, and the other through hole 12 is located at the liquid outlet end part divided by the sealing rubber tube 20. Gas is injected into the sealing rubber tube 20 through the ground, and high-pressure gas enters the nozzle 8 through the liquid outlet through the through hole 12. Under the action of the high-pressure gas flow, the gas flow enters the nozzle 8 through the through hole 12 to form an accelerating fluid; this embodiment can artificially inject high-pressure gas when the outside of the oil pipe cannot provide sufficient pressure for the nozzle 8, so that the ejection and pumping assembly 1 can work normally, improve the working efficiency of the equipment, and make the downhole pressure at different time periods available for effective response plans, so that the downhole energy can be effectively released, and the gas production efficiency is improved.

[0055] Furthermore, the liquid drawing pipe 7 is provided with a slit screen tube and / or a rupture disk; the provision of the slit screen tube and / or the rupture disk can effectively filter impurities and maintain stable operation of the equipment.

[0056] Furthermore, a method for using a gas well ejection pumping device comprises the following steps:

[0057] S1: When lowering the oil pipe, the seating assembly 11 is connected between two sections of the oil pipe through the connecting structure 19 and lowered into the well together. Under the elastic force of the elastic component 14, the sleeve 13 blocks the through hole 12 to prevent liquid outside the oil pipe from entering the oil pipe;

[0058] S2: When the downhole pressure is sufficient, the seating assembly 11 operates normally as a part of the tubing;

[0059] S3: When the downhole pressure is insufficient, the ejector assembly 1 is lowered from the wellhead. Under the action of gravity, the ejector assembly 1 is inserted into the seat assembly 11, and the elastic component 14 is compressed to make the sleeve 13 fall off to expose the through hole 12. At this time, the through hole 12 is connected with the air inlet 10, and the ejector assembly 1 is fixed by the anti-retraction device 15.

[0060] S4: Figure 6 As shown, when the conditions for starting the ejector pumping assembly 1 are met, a soluble ball is placed through the wellhead, and after being pumped into place, the pressure is held up to shear off the starter assembly 2, or the pressure is held up at the wellhead directly, and the starter assembly 2 is sheared off from the easy fault layer 18 under the throttling pressure of the ejector 5;

[0061] S5: After the starting component 2 is cut off, the main body of the ejector assembly 1 moves toward the liquid inlet end relative to the shell 3 under the action of the wellhead pressure, and the drainage channel 6 is connected with the air inlet hole 10. The through hole 12, the air inlet hole 10 and the drainage channel 6 introduce the liquid and / or gas outside the oil pipe into the nozzle 8. The nozzle 8 accelerates the liquid and / or gas outside the oil pipe to spray into the mixing chamber 9. Negative pressure is generated in the mixing chamber 9, and the liquid and / or gas in the oil pipe at the liquid inlet end is sucked from the liquid pumping pipe 7 connected by the bypass.

[0062] Furthermore, after step S5 continues for a period of time, when the formation energy is insufficient, the sealing rubber tube 20 expands when it encounters liquid, dividing the annulus between the oil pipe and the casing into two parts, upper and lower parts, and air is injected into the sealing rubber tube 20 through the ground. Under the action of high-pressure airflow, the airflow enters the nozzle 8 through the through hole 12 to form an accelerating fluid.

[0063] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A gas well pumping device, characterized in that: include: An ejection and liquid drawing component (1) and a starting component (2), wherein the ejection and liquid drawing component (1) comprises an ejection and liquid drawing component (1) body and a shell (3), wherein the shell (3) is arranged as a tubular structure, the shell (3) is provided with an air inlet hole (10), and limit blocks (4) are arranged at both ends of the inner wall, the ejection and liquid drawing component (1) is arranged in the shell (3), and the ejection and liquid drawing component (1) can slide between the two limit blocks (4); The ejector and liquid-drawing assembly (1) comprises an ejector (5), a drainage channel (6) and a liquid-drawing pipe (7); the ejector (5) further comprises a nozzle (8) and a mixing chamber (9); the drainage channel (6) is arranged on the side of the ejector and liquid-drawing assembly (1) and is connected to the nozzle (8); the liquid-drawing pipe (7) is connected to the mixing chamber (9); when the nozzle (8) ejects fluid at a high speed, negative pressure is generated in the mixing chamber (9) and the liquid-drawing pipe (7); When the ejection and liquid drawing component (1) slides to the liquid inlet end of the housing (3), the drainage channel (6) and the air inlet hole (10) are connected, and when it is at the non-liquid inlet end of the housing (3), the drainage channel (6) and the air inlet hole (10) are disconnected; the starting component (2) is arranged between the housing (3) and the ejection and liquid drawing component (1) and is used to fix the ejection and liquid drawing component (1) to the non-liquid inlet end of the housing (3).

2. A gas well pumping device according to claim 1, characterized in that: The invention comprises a seating component (11), wherein a through hole (12) is arranged on a side wall of the seating component (11), a sleeve (13) is slidably arranged inside the seating component (11), and an elastic component (14) is arranged at one end of the sleeve (13) so as to enable the sleeve (13) to cover the through hole (12).

3. A gas well pumping device according to claim 2, characterized in that: After the ejection and liquid drawing component (1) is inserted into the seating component (11), an anti-retraction device (15) is arranged at the corresponding position.

4. A gas well pumping device according to claim 2, characterized in that: Sealing rings (16) are provided at both ends of the sleeve (13).

5. A gas well pumping device according to claim 1, characterized in that: A check valve (17) is arranged in the air inlet (10).

6. A gas well pumping device according to claim 1, characterized in that: The starting component (2) is provided with an easy-to-break layer (18) at the junction of the outer shell (3) and the ejection and liquid-drawing component (1).

7. A gas well pumping device according to claim 1, characterized in that: Both ends of the housing (3) are provided with connection structures (19) for connecting to a continuous oil pipe.

8. A gas well pumping device according to claim 2, characterized in that: Both ends of the seating assembly (11) are provided with connection structures (19) for connecting oil pipes.

9. A gas well pumping device according to claim 2, characterized in that: It comprises a sealing rubber tube (20), the through holes (12) are arranged in two numbers, the sealing rubber tube (20) is sleeved on the seating component (11) and arranged between the two through holes (12).

10. A gas well pumping device according to claim 2, characterized in that: The lower part of the liquid drawing pipe (7) is provided with a slit screen pipe and / or a rupture disk.

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