Opening pressure field-adjustable easily-measured gas lift valve device and opening pressure field-adjustable easily-measured gas lift valve method

Abstract

The invention discloses an easy-to-test gas lift valve device with opening pressure adjustable on site and a method, and belongs to the technical field of oil and gas exploitation equipment. The device comprises a working barrel, an adjusting valve body, a corrugated valve body, an opening valve body, a connecting barrel, a nitrogen charging valve body, a check valve body, an oil pipe joint, a corrugated pipe, a valve rod, a valve seat, an elastic damper, a compression spring, a tail plug, a sealing head seat, a sealing ring, a sealing rod and a series of parts of a manual hydraulic pump. The function that the opening pressure of the gas lift valve can be adjusted on site is achieved through cooperation of the gas lift pressure adjusting tool module and the gas lift valve adjusting valve body, and the problem that the nitrogen injection amount cannot be adjusted in time when actual formation parameters (formation pressure, fluid characteristics and the like) of an oil well are different from a predicted value due to the fact that the gas lift opening pressure is fixed is solved. Meanwhile, the valve rod and the valve seat are prevented from being collided and damaged, the corrugated pipe is high in pressure resistance, heavy oil and sediment mixtures are prevented from flowing back, and gas lift pressure loss is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas production equipment, and particularly relates to a gas lift valve device and method with adjustable on-site opening pressure and easy measurement. Background Technique

[0002] In the recent oil and gas exploration and development process in the ocean, the early conventional test results for deep, low-permeability, heavy oil, and high pour-point reservoirs are not ideal. It is difficult to obtain data such as the true production capacity, formation fluid samples, formation pressure and temperature of deep, low-permeability heavy oil reservoirs, which ultimately affects the economic exploitation value assessment of the entire exploration block and causes difficulties for subsequent development evaluation. At the same time, it is also very difficult to achieve efficient and safe exploitation of deep, low-permeability reservoirs. Artificial lift assistance process is one of the key measures to ensure the effective release of test production capacity. For example: screw pump, electric submersible pump, coiled tubing gas lift, etc. However, due to the limitations of their own design physical principles, they cannot be applied to deep / low-permeability / high pour-point reservoirs. Therefore, the gas lift process plays an important role and significance in the testing and exploitation of deep, low-permeability reservoirs.

[0003] The gas lift valve lift process has achieved good application results in the liquid drainage of deep, low-permeability reservoirs, proving that it can effectively solve the problem of efficient liquid drainage. However, through on-site application, it is found that there are still some shortcomings in its technical process and need to be optimized and technologically upgraded. For example:

[0004] (1) The opening pressure of the gas lift valve is fixed. When the actual formation parameters (formation pressure, fluid characteristics, etc.) of the test well are different from the predicted values, the nitrogen injection volume cannot be adjusted in time.

[0005] (2) In the existing gas lift valve stem and seat design, it is very easy to cause severe collision between the valve stem and seat due to the disappearance of the external nitrogen pressure, damaging the seat and resulting in inability to seal.

[0006] (3) The bellows design of the existing gas lift valve cannot withstand high pressure, has poor pressure resistance, and is easily damaged in some high-pressure environments during the use of the gas lift valve, making it unable to be used, which in turn affects the entire gas lift process.

[0007] (4) The existing gas lift valve has no anti-backflow design, and the heavy oil and sediment mixture in the tubing will enter the gas lift valve under pressure, causing blockage of the gas lift valve and seriously affecting the normal operation of the gas lift valve.

[0008] (5) The existing gas lift valve nozzle structure design will cause gas lift pressure loss, increase the power of the ground nitrogen filling facility, and increase the overall cost of the gas lift valve lift process.

[0009] (6) The existing gas lift valve working barrel structure is welded by multiple components, with low strength, and is very easy to collide during the lowering process of the gas lift valve, resulting in damage to the gas lift valve working barrel and inability to work normally.

[0010] In order to effectively solve the deficiencies existing in the existing gas lift lifting process, it is urgent to invent a gas lift valve device and method with adjustable opening pressure on-site and easy to measure, so as to solve several problems in the use process of the existing gas lift device. Summary of the Invention

[0011] The purpose of the present invention is to propose a gas lift valve device and method with adjustable opening pressure on-site and easy to measure in view of the problems existing in the existing gas lift valve. Its characteristics are as follows: it includes a gas lift operation tool and a pressure adjustment and measurement tool supporting the gas lift valve;

[0012] The gas lift operation tool mentioned above includes a gas lift valve, a working barrel and a setscrew. The gas lift valve includes an adjusting valve body, a nitrogen charging valve body, a corrugated valve body, an opening valve body, a connecting barrel and a tubing joint. The nitrogen charging valve body is connected to the corrugated valve body, the corrugated valve body is connected to the opening valve body, the opening valve body is connected to the connecting barrel, and the connecting barrel is connected to the tubing joint by threads; among them, the adjusting valve body includes a tail plug, a sealing ring, a head seat I, a head seat II, a gasket, a sealing rod. The tail plug is connected to the adjusting valve body by threads. The sealing ring, head seat I, head seat II and gasket are connected in contact with each other from left to right and placed in the cavity of the adjusting valve body. The gasket is located on the third-stage boss of the adjusting valve body; among them, the corrugated valve body includes a corrugated pipe, a valve rod and an elastic damper, a valve seat. The valve seat is located on the boss of the opening valve body. The corrugated pipe is located on the inner wall of the corrugated valve body and is connected in contact with both the corrugated valve body and the valve rod. The elastic damper is fixed between the valve rod and the valve seat; among them, the tubing joint includes a check valve, the check valve is connected to a compression spring, and the lower end of the compression spring is connected to the inner cavity boss of the tubing joint; the upper end of the working barrel is provided with an arc-shaped boss, and the lower end is provided with an arc-shaped air inlet; the setscrew is connected to the working barrel by threads and is in contact with the tail plug of the gas lift valve at the same time. The tubing joint of the gas lift valve is connected to the working barrel by threads;

[0013] The pressure adjustment and measurement tool supporting the gas lift valve includes a manual hydraulic pump, a pressure gauge I, an oil inlet pipe, a cover valve body, a fixed valve body, an oil outlet valve body, a fixed buckle, an oil outlet pipe, a lock buckle, a box body, a pressure gauge II, a cover plate. The manual hydraulic pump is fixed in the pressure regulation tool box by screws. The cover valve body is connected to the fixed valve body, and the fixed valve body is connected to the oil outlet valve body by threads. The oil inlet pipe and the fixed valve body, and the oil outlet pipe and the oil outlet valve body are both interference connections.

[0014] An internal thread Ⅰ is provided in the inner cavity at the left end of the corrugated valve body. An external thread Ⅰ is provided on the outer wall at the right end of the corrugated valve body, and a positioning boss Ⅰ is also provided. An internal thread Ⅱ is provided in the inner cavity at the left end of the opening valve body. An external thread Ⅱ is provided on the outer wall at the right end of the opening valve body. An air lift intake hole is circumferentially provided in the middle of the outer wall, and a raised step Ⅰ is provided in the middle. An internal thread Ⅲ is provided in the inner cavity at the left end of the connecting cylinder, and an external thread Ⅲ is provided on the outer side at the right end. A limiting boss Ⅱ is provided inside the outer end in the middle of the nitrogen charging valve body. A positioning boss Ⅱ is provided at the outer part of the right end. An external thread Ⅳ is provided on the outer wall at the right end, and a pressure adjustment scale line is provided on the outer surface at the upper end. An internal thread Ⅴ is provided in the inner cavity at the left end of the oil pipe joint, and a connecting taper thread is provided on the outer wall at the right end of the oil pipe joint.

[0015] A piston rod is provided at the right end of the regulating valve body. A hexahedron concave platform is provided at the outer part of the left end. A first-stage boss, a second-stage boss, a third-stage boss, and a fourth-stage boss are successively provided from left to right.

[0016] A positioning boss Ⅲ is provided in the middle of the valve stem, and a valve ball is provided at the right end thereof.

[0017] A Venturi-type boss is provided at the upper end of the valve seat. A sealing groove Ⅰ is provided in the middle, and a sealing ring is provided in the sealing groove Ⅰ.

[0018] Positioning bosses Ⅳ are provided at both ends of the corrugated pipe, and the corrugated pipe is subjected to pressure resistance treatment.

[0019] A sealing valve ball is provided at the top of the check valve. A sealing groove Ⅱ is provided in the middle of the sealing valve ball, and a sealing ring is provided in the sealing groove Ⅱ.

[0020] A connecting hinge Ⅱ is provided at the rear end of the box body. A hydraulic pump fixing plate is provided in the upper part inside the box. A valve body fixing boss is provided in the lower part. Mounting holes are provided at the four corners of the top end surface. A connecting hinge Ⅰ is designed at the rear end of the cover plate, and a handle is provided at the upper end of the cover plate.

[0021] A hexagonal boss is provided at the left end of the capping valve body. A connecting external thread Ⅰ is provided at the outer part of the left end of the fixing valve body. A threaded base is provided inside the middle end. An oil inlet pipe connection port is provided at the upper part of the right end. A connecting external thread Ⅱ is provided at the outer part of the right end. An oil outlet pipe connection port is provided at the left end of the oil outlet valve body, and a connecting internal thread is provided at the right end.

[0022] According to the described air lift valve device with adjustable and easily measurable opening pressure on-site, a method for easily measuring the opening pressure of the air lift valve on-site is designed. The specific steps for pressure adjustment are as follows:

[0023] S1: Installation of the air lift valve

[0024] Place the gas lift valve into the pressure adjustment and testing tool for the gas lift valve. Fix the threaded base on the fixed valve body in the pressure adjustment and testing tool for the gas lift valve to the tubing joint of the gas lift valve through threads, and simultaneously lock the fixing buckle.

[0025] S2: Coarse adjustment of gas lift pressure

[0026] After the gas lift valve is fixed, rotate the hexahedron concave platform of the adjusting valve body with a movable wrench for pressure adjustment. There are pressure adjustment scale lines set on the nitrogen-filled valve body of the gas lift valve according to the test results of the gas lift valve pressure experiment. Screw the adjusting valve body to the pressure adjustment scale line corresponding to the required pressure value, and then stop rotating.

[0027] S3: Fix the cover valve body

[0028] Use a movable wrench to tighten the cover valve body and the fixed valve body through threads, so that the gas lift valve is completely fixed in the pressure adjustment and testing tool for the gas lift valve.

[0029] S4: Pressure test

[0030] Connect the inlet pipe to the oil inlet of the fixed valve body, and pressurize the annulus formed between the fixed valve body, the cover valve body and the gas lift valve. When the value of pressure gauge Ⅱ is stable, the pressure value of pressure gauge Ⅰ at this moment is the current opening pressure of the gas lift valve.

[0031] S5: Fine adjustment of pressure

[0032] If the pressure shown by pressure gauge Ⅰ does not match the required opening pressure of the gas lift valve and there is a certain error, pressure fine adjustment will be carried out. Separate the cover valve body from the fixed valve body through threads, remove the cover valve body, slightly turn the adjusting valve body with a movable wrench for pressure adjustment, and decide whether to rotate inward to increase the pressure or rotate outward to decrease the pressure according to the pressure error range. After completion, fix the cover valve body again and conduct the pressure test again. If there is still an error in the pressure, repeat the above steps until the value shown by pressure gauge Ⅰ is equal to the required opening pressure value of the gas lift valve, and complete the adjustment of the gas lift opening pressure.

[0033] The beneficial effects of the present invention are:

[0034] (1) The present invention uses the gas lift pressure adjustment tooling module to cooperate with the adjusting valve body of the gas lift valve, realizing the function of adjustable on-site opening pressure of the gas lift valve, and solving the problem that when the opening pressure of the gas lift is fixed and the actual formation parameters of the oil well are different from the predicted values, the injection nitrogen volume cannot be adjusted in time.

[0035] (2) In the present invention, a corrugated pipe and an elastic damper are combined and used. An elastic damper is installed between the valve seat and the valve stem to increase the damping effect, slow down the rebound speed of the valve ball, and prevent the corrugated pipe from instantly retracting when the gas lift system becomes unstable due to a sudden decrease in the injection pressure. This avoids the rapid displacement of the valve ball and its violent collision with the valve seat, which may cause damage to the valve seat and the valve ball, thereby affecting the gas lift effect.

[0036] (3) In the present invention, by increasing the number of layers of the corrugated pipe, changing the relative structural parameters of the corrugated pipe, and increasing the thickness of each layer of the corrugated pipe, the internal nitrogen pressure value of the corrugated pipe is increased, and the corrugated pipe can withstand a pressure of 35 Mpa. At the same time, a nozzle in the shape of a Venturi tube is adopted to reduce the pressure loss of the gas passing through the nozzle, thereby reducing the operating pressure for opening the gas lift valve, reducing the burden on the compressor, and saving the gas lift cost.

[0037] (4) The present invention designs and utilizes a check valve to achieve the function of preventing the mixture of viscous oil and sediment from flowing back into the gas lift valve, solving the problem of blockage of the gas lift valve caused by the backflow of the mixture of viscous oil and sediment, and thus being unable to work properly. At the same time, the check valve's anti-backflow ability is increased through a compression spring, making its anti-backflow effect better.

[0038] (5) The working barrel is integrally cast and formed with an arc-shaped fixed boss, which has relatively high strength and can prevent damage to the working barrel of the gas lift valve caused by collision during the process of lowering the gas lift valve. Description of the Drawings

[0039] Figure 1 It is a half-sectional view of the assembly of the gas lift valve and the working barrel of the present invention;

[0040] Figure 2 It is a half-sectional view of the working barrel of the present invention;

[0041] Figure 3 It is an overall assembly drawing of the pressure adjustment and measurement tool supporting the gas lift valve of the present invention;

[0042] Figure 4 It is a partial sectional view of the pressure adjustment and measurement tool supporting the gas lift valve of the present invention;

[0043] Figure 5 It is a half-sectional view of the corrugated valve body of the present invention;

[0044] Figure 6 It is a half-sectional view of the opening valve body of the present invention;

[0045] Figure 7 It is a half-sectional view of the connecting barrel of the present invention;

[0046] Figure 8 It is an external view of the nitrogen-filled valve body of the present invention;

[0047] Figure 9 It is a half-sectional view of the nitrogen-filled valve body of the present invention;

[0048] Figure 10 Half-sectional view of the tubing joint of the present invention;

[0049] Figure 11 Half-sectional view of the regulating valve body of the present invention;

[0050] Figure 12 Half-sectional view of the valve stem of the present invention;

[0051] Figure 13 Half-sectional view of the valve seat of the present invention;

[0052] Figure 14 Half-sectional view of the bellows of the present invention;

[0053] Figure 15 Half-sectional view of the check valve of the present invention;

[0054] Figure 16 Three-dimensional schematic diagram of the cover plate of the present invention;

[0055] Figure 17 Three-dimensional schematic diagram of the box body of the present invention;

[0056] Figure 18 Three-dimensional schematic diagram of the sealing valve body of the present invention;

[0057] Figure 19 Half-sectional view of the fixed valve body of the present invention;

[0058] Figure 20 Half-sectional view of the oil outlet valve body of the present invention;

[0059] Figure 21 Flow chart of the on-site adjustment method for the opening pressure of the present invention;

[0060] In the figure, 1 is the tail plug; 2 is the sealing ring; 3 is the head seat I; 4 is the regulating valve body, 401 is the first-stage boss, 402 is the second-stage boss, 403 is the third-stage boss, 404 is the fourth-stage boss, 405 is the piston rod, 406 is the hexahedron concave; 5 is the head seat II; 6 is the gasket; 7 is the sealing rod; 8 is the nitrogen charging valve body, 801 is the limit boss II, 802 is the positioning boss II, 803 is the external thread IV, 804 is the pressure regulating scale line; 9 is the corrugated valve body, 901 is the internal thread I, 902 is the external thread I, 903 is the positioning boss I; 10 is the corrugated pipe, 1001 is the positioning boss IV; 11 is the elastic damper, 1101 is the positioning boss I, 1102 is the valve ball, 1103 is the valve rod air inlet; 12 is the valve rod, 1201 is the positioning boss III, 1202 is the valve ball; 13 is the valve seat, 1321 is the Venturi boss, 1322 is the sealing groove I; 14 is the opening valve body, 1401 is the internal thread II, 1402 is the external thread II, 1403 is the gas lift air inlet, 1404 is the raised step I; 15 is the connecting cylinder, 1501 is the internal thread III, 1502 is the external thread III; 16 is the check valve, 1601 is the sealing valve ball, 1602 is the sealing groove II; 17 is the compression spring; 18 is the tubing joint, 1801 is the internal thread V, 1802 is the connecting taper thread; 19 is the working cylinder, 1901 is the arc boss, 1902 is the arc air inlet; 20 is the setscrew; 21 is the manual hydraulic pump; 22 is the pressure gauge I; 23 is the inlet pipe; 24 is the cover valve body, 2401 is the hexagonal boss; 25 is the fixed valve body, 2501 is the connecting external thread I, 2502 is the threaded base, 2503 is the inlet pipe connection port, 2504 is the connecting external thread II; 26 is the outlet valve body, 2601 is the outlet pipe connection port, 2602 is the connecting internal thread; 27 is the fixed buckle; 28 is the outlet pipe; 29 is the locking buckle; 30 is the box body, 3001 is the hydraulic pump fixing plate, 3002 is the connecting hinge II, 3003 is the mounting hole, 3004 is the valve body fixing boss; 31 is the pressure gauge II; 32 is the cover plate, 3201 is the connecting hinge I, 3202 is the handle. Detailed implementation mode

[0061] To make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific implementation modes and with reference to the accompanying drawings. It should be noted that these are exemplary and are not intended to limit the application scope of the present invention.

[0062] As Figure 1-21 shown, an air lift valve device with adjustable opening pressure and easy on-site measurement, characterized in that it includes an air lift operation tool and an air lift valve supporting pressure adjustment and measurement tool;

[0063] The described gas lift operation tool includes a gas lift valve, a working barrel 19, and a setscrew 20. The gas lift valve includes an adjusting valve body 4, a nitrogen charging valve body 8, a corrugated valve body 9, an opening valve body 14, a connecting barrel 15, and a tubing joint 18. The nitrogen charging valve body 8 is threadedly connected to the corrugated valve body 9, the corrugated valve body 9 is threadedly connected to the opening valve body 14, the opening valve body 14 is threadedly connected to the connecting barrel 15, and the connecting barrel 15 is threadedly connected to the tubing joint 18. Among them, the adjusting valve body 4 includes a tail plug 1, a sealing ring 2, a head seat I 3, a head seat II 5, a gasket 6, and a sealing rod 7. The tail plug 1 is threadedly connected to the adjusting valve body 6. The sealing ring 2, the head seat I 3, the head seat II 5, and the gasket 6 are sequentially in contact and connected and placed in the cavity of the adjusting valve body 4. The gasket 6 is located on the third-stage boss 403 of the adjusting valve body 4. Among them, the corrugated valve body 9 includes a corrugated pipe 10, a valve rod 12, an elastic damper 11, and a valve seat 13. The valve seat 13 is located on the boss of the opening valve body 14. The corrugated pipe 10 is located on the inner wall of the corrugated valve body 9 and is in contact connection with both the corrugated valve body 9 and the valve rod 12. The elastic damper 11 is fixed between the valve rod 12 and the valve seat 13. Among them, the tubing joint 18 includes a check valve 16. The check valve 16 is connected to a compression spring 17, and the lower end of the compression spring 17 is connected to the inner cavity boss 1803 of the tubing joint. The upper end of the working barrel 19 is provided with an arc-shaped boss 1901, and the lower end is provided with an arc-shaped air inlet 1902. The setscrew 20 is threadedly connected to the working barrel 19 and is in contact with the tail plug 1 of the gas lift valve at the same time. The tubing joint 18 of the gas lift valve is threadedly connected to the working barrel 19.

[0064] The described pressure adjustment and measurement tool for the gas lift valve includes a manual hydraulic pump 21, a pressure gauge I 22, an oil inlet pipe 23, a cover valve body 24, a fixed valve body 25, an oil outlet valve body 26, a fixed buckle 27, an oil outlet pipe 28, a lock buckle 29, a box body 30, a pressure gauge II 31, and a cover plate 32. The manual hydraulic pump 21 is fixed in the pressure regulation tool box 29 by screws. The cover valve body 24 is threadedly connected to the fixed valve body 25, and the fixed valve body 25 is threadedly connected to the oil outlet valve body 26. The oil inlet pipe 23 and the fixed valve body 25, and the oil outlet pipe 28 and the oil outlet valve body 26 are both in interference connection.

[0065] An internal thread I 901 is provided in the left - hand inner cavity of the corrugated valve body 9. An external thread I 902 is provided on the outer wall at the right end of the corrugated valve body 9, and a positioning boss I 903 is also provided. An internal thread II 1401 is provided in the left - hand inner cavity of the opening valve body 14. An external thread II 1402 is provided on the outer wall at the right end of the opening valve body 14. An air - lift air inlet hole 1403 is circumferentially provided in the middle of the outer wall, and a raised step I 1404 is provided in the middle. An internal thread III 1501 is provided in the left - hand inner cavity of the connecting cylinder 15, and an external thread III 1502 is provided on the outer side at the right end. A limiting boss II 801 is provided inside the outer end in the middle of the nitrogen - filling valve body 8. A positioning boss II 802 is provided at the right - hand outer part. An external thread IV 803 is provided on the outer wall at the right end, and a pressure - regulating scale line 804 is provided on the outer surface at the upper end. An internal thread V 1801 is provided in the left - hand inner cavity of the oil - pipe joint 18, and a connecting taper thread 1802 is provided on the outer wall at the right end of the oil - pipe joint 5.

[0066] A piston rod 405 is provided at the right end of the regulating valve body 4. A hexahedron concave platform 406 is provided at the outer part of the left end. A first - stage boss 401, a second - stage boss 402, a third - stage boss 403, and a fourth - stage boss 404 are provided in sequence from left to right.

[0067] A positioning boss III 1201 is provided in the middle of the valve stem 12, and a valve ball 1202 is provided at its right end.

[0068] A Venturi - type boss 1321 is provided at the upper end of the valve seat 13. A sealing groove I 1322 is provided in the middle, and a sealing ring 2 is provided in the sealing groove I 1322.

[0069] Positioning bosses IV 1001 are provided at both ends of the corrugated pipe 10, and the corrugated pipe has been subjected to pressure resistance treatment.

[0070] A sealing valve ball 1601 is provided at the top of the check valve 16. A sealing groove II 1602 is provided in the middle of the sealing valve ball, and a sealing ring 2 is provided in the sealing groove II 1602.

[0071] A connecting hinge II 3002 is provided at the rear end of the box body 30. A hydraulic - pump fixing plate 3001 is provided in the upper part inside the box, a valve - body fixing boss 3004 is provided in the lower part, and mounting holes 3003 are provided at the four corners of the top surface. A connecting hinge I 3201 is designed at the rear end of the cover plate 32, and a handle 3202 is provided at the upper end of the cover plate.

[0072] A hexagonal boss 2401 is provided at the left end of the sealing valve body 24. A connecting external thread I 2501 is provided at the outer part of the left end of the fixed valve body 25, a threaded base 2502 is provided inside the middle part, an oil - inlet pipe connection port 2503 is provided at the upper part of the right end, and a connecting external thread II 2504 is provided at the outer part of the right end. An oil - outlet pipe connection port 2601 is provided at the left end of the oil - outlet valve body 26, and a connecting internal thread 2602 is provided at the right end.

[0073] A method for easily measuring the opening pressure of a gas lift valve on-site is designed for a gas lift valve device with an on-site adjustable opening pressure as described in claims 1-9. The specific steps for pressure adjustment are as follows:

[0074] S1: Installation of the gas lift valve

[0075] Place the gas lift valve into the pressure adjustment and measurement tool supporting the gas lift valve. Fix the threaded base 2502 on the fixed valve body 25 in the pressure adjustment and measurement tool supporting the gas lift valve and the tubing joint 18 of the gas lift valve to the threaded base 2502 by threading, and at the same time lock the fixing buckle 27.

[0076] S2: Coarse adjustment of the gas lift pressure

[0077] After the gas lift valve is fixed, use a movable wrench to rotate the hexahedron concave platform 406 of the adjusting valve body 4 for pressure adjustment. There is a pressure adjustment scale line 804 set on the nitrogen-filled valve body 8 of the gas lift valve according to the test results of the gas lift valve pressure experiment. Rotate the adjusting valve body 4 until it reaches the pressure adjustment scale line 804 corresponding to the required pressure value, and then stop rotating.

[0078] S3: Fix the cover valve body

[0079] Use a movable wrench to tighten the cover valve body 24 and the fixed valve body 25 by threading, so that the gas lift valve is completely fixed in the pressure adjustment and measurement tool supporting the gas lift valve.

[0080] S4: Pressure test

[0081] Connect the inlet pipe 23 to the oil inlet of the fixed valve body 25, and press the oil into the annulus formed between the fixed valve body 25, the cover valve body 24 and the gas lift valve. When the value of pressure gauge Ⅱ 31 is stable, the pressure value of pressure gauge Ⅰ 22 at this moment is the current opening pressure of the gas lift valve.

[0082] S5: Fine adjustment of pressure

[0083] If the pressure shown by pressure gauge Ⅰ 31 does not match the required opening pressure of the gas lift valve and there is a certain error, pressure fine adjustment will be carried out. Separate the cover valve body 24 from the fixed valve body 25 by threading, remove the cover valve body 24, and slightly turn the adjusting valve body 4 with a movable wrench for pressure adjustment. Determine whether to rotate inward to increase the pressure or rotate outward to reduce the pressure according to the pressure error range. After completion, fix the cover valve body 24 again and conduct a pressure test again. If there is still an error in the pressure, repeat the above steps until the value shown by pressure gauge Ⅰ 22 is equal to the required opening pressure value of the gas lift valve, and complete the adjustment of the gas lift opening pressure.

Claims

1. A gas lift valve device with field adjustable and testable opening pressure, characterized in that: Including gas lift operation tools, gas lift valve supporting pressure adjustment and testing tools; The gas lift operation tool comprises a gas lift valve, a working cylinder (19) and a top screw (20); the gas lift valve comprises a regulating valve body (4), a nitrogen charging valve body (8), a bellows valve body (9), an opening valve body (14), a connecting cylinder (15) and an oil pipe joint (18); the nitrogen charging valve body (8) and the bellows valve body (9), the bellows valve body (9) and the opening valve body (14), the opening valve body (14) and the connecting cylinder (15), and the connecting cylinder (15) and the oil pipe joint (18) are connected. The regulating valve body (4) includes a tail plug (1), a sealing ring (2), a head seat I (3), a head seat II (5), a sealing gasket (6), and a sealing rod (7). The tail plug (1) is connected to the regulating valve body (6) by threads. The sealing ring (2), the head seat I (3), the head seat II (5), and the sealing gasket (6) are contacted and connected in sequence from left to right and are placed in the cavity of the regulating valve body (4). The sealing gasket (6) is located at the three-stage convex portion of the regulating valve body (4). The bellows valve body (9) includes a bellows (10), a valve stem (12), an elastic damper (11), and a valve seat (13). The valve seat (13) is located on the boss of the open valve body (14). The bellows (10) is located on the inner wall of the bellows valve body (9) and is connected to the bellows valve body (9) and the valve stem (12) by contact. The elastic damper (11) is fixed between the valve stem (12) and the valve seat (13). The oil pipe joint (18) includes a check valve. (16), the check valve (16) is connected to the compression spring (17), and the lower end of the compression spring (17) is connected to the inner cavity boss (1803) of the oil pipe joint; the upper end of the working cylinder (19) is provided with an arc boss (1901), and the lower end is provided with an arc air inlet (1902); the top screw (20) is connected to the working cylinder (19) by threading, and is in contact with the tail plug (1) of the gas lift valve at the same time, and the oil pipe joint (18) of the gas lift valve is connected to the working cylinder (19) by threading; The pressure adjustment and testing tool for the gas lift valve comprises a manual hydraulic pump (21), a pressure gauge I (22), an oil inlet pipe (23), a sealing valve body (24), a fixed valve body (25), an oil outlet valve body (26), a fixing buckle (27), an oil outlet pipe (28), a locking buckle (29), a box (30), a pressure gauge II (31), and a cover plate (32). The manual hydraulic pump (21) is fixed in the pressure regulating tool box (29) by screws, the sealing valve body (24) and the fixed valve body (25), the fixed valve body (25) and the oil outlet valve body (26) are all connected by threads, and the oil inlet pipe (23) and the fixed valve body (25), and the oil outlet pipe (28) and the oil outlet valve body (26) are all interference fit connections.

2. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The inner cavity of the left end of the bellows valve body (9) is provided with an internal thread I (901), and the outer wall of the right end of the bellows valve body (9) is provided with an external thread I (902), and a positioning boss I (903) is also provided; the inner cavity of the left end of the opening valve body (14) is provided with an internal thread II (1401), and the outer wall of the right end of the opening valve body (14) is provided with an external thread II (1402), and the middle part of the outer wall is provided with an air lift inlet hole (1403) in the circumferential direction, and a raised step I (1404) is provided in the middle; the inner cavity of the left end of the connecting tube (15) An internal thread III (1501) is arranged inside, and an external thread III (1502) is arranged on the outer side of the right end; a limiting boss II (801) is arranged inside the outer end of the middle part of the nitrogen charging valve body (8), a positioning boss II (802) is arranged outside the right end, an external thread IV (803) is arranged on the outer wall of the right end, and a pressure adjustment scale line (804) is arranged on the outer surface of the upper end; an internal thread V (1801) is arranged in the inner cavity of the left end of the oil pipe joint (18), and a connecting cone thread (1802) is arranged on the outer wall of the right end of the oil pipe joint (5).

3. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The regulating valve body (4) is provided with a piston rod (405) at the right end, and a hexahedral concave platform (406) is provided on the outside of the left end. From left to right, a primary boss (401), a secondary boss (402), a tertiary boss (403) and a quaternary boss (404) are provided in sequence.

4. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: A positioning boss III (1201) is arranged in the middle of the valve stem (12), and a valve ball (1202) is arranged at the right end thereof.

5. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The upper end of the valve seat (13) is provided with a Venturi-type boss (1321), the middle part is provided with a sealing groove I (1322), and a sealing ring (2) is provided in the sealing groove I (1322).

6. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The two ends of the bellows (10) are provided with positioning bosses IV (1001), and the bellows is subjected to pressure resistance treatment.

7. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The top of the check valve (16) is provided with a sealing valve ball (1601), the middle of the sealing valve ball is provided with a sealing groove II (1602), and a sealing ring (2) is provided in the sealing groove II (1602).

8. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The box body (30) is provided with a connecting hinge II (3002) at the rear end, a hydraulic pump fixing plate (3001) is provided at the upper part of the box, a valve body fixing boss (3004) is provided at the lower part, and mounting holes (3003) are provided at the four corners of the top surface; the cover plate (32) is designed with a connecting hinge I (3201) at the rear end, and a handle (3202) is provided at the upper end of the cover plate.

9. The gas lift valve device with field adjustable and testable opening pressure according to claim 1, characterized in that: The left end of the sealing valve body (24) is provided with a hexagonal boss (2401); the left end of the fixed valve body (25) is provided with a connecting external thread I (2501) on the outside, the middle end is provided with a threaded base (2502) on the inside, the upper right end is provided with an oil inlet pipe connection port (2503), and the right end is provided with a connecting external thread II (2504) on the outside; the left end of the oil outlet valve body (26) is provided with an oil outlet pipe connection port (2601), and the right end is provided with a connecting internal thread (2602).

10. A method for easily measuring the opening pressure of a gas lift valve on site, characterized in that: Using any one of the gas lift valve devices with adjustable opening pressure in situ and easy to measure according to claims 1-9, the specific steps of pressure regulation are as follows: S1: Gas lift valve installation Place the gas lift valve into the gas lift valve supporting pressure adjustment and testing tool, and fix the gas lift valve oil pipe joint (18) on the threaded base (2502) on the fixed valve body (25) in the gas lift valve supporting pressure adjustment and testing tool by threading, and lock the fixing buckle (27) at the same time; S2: Coarse adjustment of gas lift pressure After the gas lift valve is fixed, the pressure is adjusted by rotating the hexahedral concave platform (406) of the regulating valve body (4) with an adjustable wrench. The nitrogen charging valve body (8) of the gas lift valve has a pressure adjustment scale line (804) set according to the test results of the gas lift valve pressure experiment. The regulating valve body (4) is screwed to the pressure adjustment scale line (804) corresponding to the required pressure value, and the rotation can be stopped. S3: Fixed cover valve body Using an adjustable wrench, tighten the sealing valve body (24) and the fixed valve body (25) through threads, so that the gas lift valve is completely fixed in the pressure adjustment tool matched with the gas lift valve; S4: Stress Test Connect the oil inlet pipe (23) to the oil inlet of the fixed valve body (25), and apply pressure to the annulus formed between the fixed valve body (25), the cover valve body (24) and the gas lift valve; when the value of the pressure gauge II (31) is observed to be stable, the pressure value of the pressure gauge I (22) at this moment is the current opening pressure of the gas lift valve; S5: Fine-tuning the pressure If the pressure displayed by the pressure gauge Ⅰ (31) does not match the required gas lift valve opening pressure and there is a certain error, the pressure will be fine-tuned; the cover valve body (24) is separated from the fixed valve body (25) by the thread, the cover valve body (24) is removed, and the regulating valve body (4) is slightly turned by an adjustable wrench to adjust the pressure. According to the pressure error range, it is decided to rotate inward to increase the pressure or outward to reduce the pressure; after completion, the cover valve body (24) is re-fixed and the pressure test is performed again; if there is still an error in the pressure, repeat the above steps until the value displayed by the pressure gauge Ⅰ (22) is equal to the required gas lift valve opening pressure value, and the gas lift opening pressure adjustment is completed.

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