Drainage gas recovery plunger with buffering function

By adding a buffer spring to the drainage gas pump plunger, the problem of easy damage to the wellhead spring and buffer positioner spring in the gas lifting and drainage gas pumping device is solved, extending the service life of the device and improving the safety of the gas well.

CN119434906APending Publication Date: 2025-02-14PETROCHINA CO LTD
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Patent Information

Application Number
CN202310967412.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-08-02
Publication Date
2025-02-14

AI Technical Summary

Technical Problem

In the prior art, the wellhead spring of the gas lifting and drainage gas extraction device is easily damaged. The safety of the gas well is affected after the wellhead spring fails, and the buffer positioner spring is not easy to detect after the failure, which may cause damage to the gas wellbore, and in severe cases, the gas well is scrapped.

Method used

A drainage gas pump plunger with buffering function is designed. By adding buffer springs inside the plunger, the stress of the inlet springs and buffer positioner springs is improved, and the damage to these springs is reduced when the plunger moves.

Benefits of technology

By increasing the buffer spring, the life of the wellhead spring and the buffer positioner spring is extended, the maintenance time and service life of the device are extended, and the safety and reliability of the gas well are improved.

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Abstract

The invention discloses a drainage gas recovery plunger with a buffering function, which comprises a plunger main body, the plunger main body is a hollow cylinder, a spring structure is arranged in the plunger main body, a baffle ring is fixedly connected to the inner wall of a port at one end of the plunger main body, an end cover is fixedly connected to the other end of the plunger main body, and the plunger main body is connected with a first support rod through the baffle ring; the plunger body is connected with a second supporting rod through an end cover, the two ends of the spring structure are in contact connection with one end of a first supporting rod and one end of the second supporting rod respectively, the other end of the first supporting rod is fixedly connected with a supporting ring, and the other end of the second supporting rod is fixedly connected with a fishing end supporting ring. Damage to a spring at the buffer positioner end and a wellhead spring in the plunger gas lift drainage gas recovery device during plunger movement is reduced, the service life of the spring is prolonged, the maintenance time of the device is prolonged, and the service life is prolonged.
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Description

Technical Field

[0001] The invention belongs to the technical field of petroleum industry devices and relates to a water drainage and gas production plunger with a buffering function. Background Art

[0002] During the operation of the gas lift drainage and gas production device, the buffer locator is first fixed at the oil pipe coupling at the predetermined position, the wellhead device is installed on the gas production tree, the ground pipeline is modified, etc., and finally the plunger is dropped. When the gas well is closed, the plunger falls on the upper end face of the buffer locator. After the gas well is opened, the high-pressure gas and liquid in the well drive the plunger to carry the liquid above the plunger to move toward the wellhead. When the plunger moves to the spring seat of the wellhead device, the upward movement of the plunger is transmitted to the inlet spring in the gas lift drainage and gas production device through the spring seat, and the plunger tends to be stationary under the action of the inlet spring; the ground valve is closed, and the plunger moves to the bottom of the well. When the plunger contacts the buffer locator, the downward movement is transmitted to the buffer locator spring in the gas lift drainage and gas production device through the upper end face of the buffer locator, and the plunger tends to be stationary under the action of the inlet spring.

[0003] Since the material downhole is under high pressure, when the existing plunger moves up to the top dead center, the salvage end hits the wellhead spring, and the kinetic energy is distributed to the wellhead spring and the spring inside the plunger. When the plunger moves down to the bottom dead center, it hits the buffer locator spring and the imported spring, thereby causing damage to the imported spring and the buffer locator spring until they fail. After the imported spring fails, it may cause the blowout preventer to rupture, resulting in direct connection between the gas well and the outside world, posing a serious safety risk; after the buffer locator spring fails, it is not easy to detect, which may cause damage to the gas wellbore, and in severe cases, the gas well may be scrapped, and the buffer locator needs to be salvaged, which makes replacement difficult. Summary of the invention

[0004] The purpose of the present invention is to provide a drainage and gas production plunger with a buffering function, which solves the problem in the prior art that the wellhead spring of a gas lift drainage and gas production device is easily damaged and the safety of the gas well is affected after the wellhead spring fails.

[0005] The technical solution adopted by the drainage and gas production plunger with buffering function of the present invention is to include a plunger body, which is a hollow cylinder. A spring structure is arranged inside the plunger body. A retaining ring is fixedly connected to the inner wall of the port at one end of the plunger body, and an end cover is fixedly connected to the other end of the plunger body. The plunger body is connected to a first support rod through the retaining ring, and the plunger body is connected to a second support rod through the end cover. Both ends of the spring structure are respectively in contact with one end of the first support rod and one end of the second support rod, the other end of the first support rod is fixedly connected to a support ring, and the other end of the second support rod is fixedly connected to a salvage end support ring.

[0006] The present invention is also characterized in that: a flow groove is provided at the center of the first support rod;

[0007] The inner wall of the retaining ring is provided with threads;

[0008] The ring surface of the baffle ring is evenly provided with a number of flow holes;

[0009] The inner wall of the end cover is provided with threads, and the annular surface of the end cover is evenly provided with a number of flow holes;

[0010] The spring structure includes a first buffer spring;

[0011] The spring structure comprises a partition, a second buffer spring is arranged at one end of the partition, and a third buffer spring is arranged at the other end of the partition.

[0012] The beneficial effects of the present invention are as follows: the drainage and gas production plunger with a buffering function of the present invention improves the force on the inlet spring and the buffering locator spring by adding a buffering spring inside the plunger, while reducing the damage to the spring and the wellhead spring at the buffering locator end of the plunger gas lift drainage and gas production device during the movement of the plunger, and prolongs the maintenance time of the device by increasing the life of the spring, thereby extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the water drainage and gas collection plunger with buffering function of the present invention;

[0014] Figure 2 It is a side view of the retaining ring of the water drainage and gas collection plunger with buffering function of the present invention;

[0015] Figure 3 This is a front view of the retaining ring of the water drainage and gas collection plunger with a buffering function of the present invention;

[0016] Figure 4 This is a front view of the first support rod of the water drainage and gas collection plunger with buffering function of the present invention;

[0017] Figure 5 This is a side view of the first support rod of the water drainage and gas collection plunger with buffering function of the present invention;

[0018] Figure 6 It is a side view of the end cover of the water drainage and gas collection plunger with buffering function of the present invention;

[0019] Figure 7 This is a front view of the end cover of the water drainage and gas collection plunger with a buffering function of the present invention;

[0020] Figure 8 It is a structural schematic diagram of a second embodiment of a water drainage and gas collection plunger with a buffering function of the present invention;

[0021] Fig. 9 It is a schematic diagram of a plunger gas lift drainage and gas production device having a drainage and gas production plunger with a buffering function according to the present invention.

[0022] In the figure, 1. support ring, 2. first support rod, 3. retaining ring, 4. plunger body, 5. spring structure, 6. end cover, 7. second support rod, 8. salvage end support ring;

[0023] 501. First buffer spring, 502. Partition plate, 503. Second buffer spring, 504. Third buffer spring. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] The water drainage and gas collection plunger with buffering function of the present invention is as follows: Figure 1 As shown, it includes a first support rod 2, one end of which is fixedly connected to a support ring 1, the other end of the first support rod 2 is sleeved with a spring structure 5, the spring structure 5 is a first buffer spring 501, the first support rod 2 is also connected to a retaining ring 3, the retaining ring 3 is fixedly connected to a plunger body 4, the retaining ring 3 is located at a port at one end of the plunger body 4, the spring structure 5 is arranged in the plunger body 4, the other end of the plunger body 4 is provided with an end cover 6, the end cover 6 is connected to a second support rod 7, one end of the second support rod 7 is in contact with the spring structure 5, the other end of the second support rod 7 is fixedly connected to a salvage end support ring 8, and the support ring 1, the retaining ring 3, the end cover 6, and the salvage end support ring 8 are fixed again using set screws to prevent loosening.

[0026] like Figure 2 , Figure 3 As shown, the retaining ring 3 is an annular body, the outer wall of the retaining ring 3 is fixedly connected to the plunger body 4, the inner wall of the retaining ring 3 is provided with threads, and a plurality of flow holes are evenly arranged on the annular surface of the retaining ring 3 for draining and exhausting water to increase air tightness.

[0027] like Figure 4 , Figure 5 As shown, a flow groove is provided at the center of the first support rod 2, and a buffer function is realized inside the plunger through the flow groove.

[0028] like Figure 6 , Figure 7 As shown, the end surface of the end cover 6 is provided with a flow hole for draining and exhausting water to increase air tightness, and the inner wall of the end cover is provided with a thread, which is connected to the second support rod 7 through the thread.

[0029] like Figure 8As shown, it includes a first support rod 2, one end of the first support rod 2 is fixedly connected to a support ring 1, the other end of the first support rod 2 is sleeved with a spring structure 5, the first support rod 2 is also connected to a retaining ring 3, the retaining ring 3 is fixedly connected to a plunger body 4, the retaining ring 3 is located at a port at one end of the plunger body 4, the spring structure 5 is arranged in the plunger body 4, the other end of the plunger body 4 is provided with an end cover 6, the end cover 6 is connected to a second support rod 7, one end of the second support rod 7 is in contact with the spring structure 5, the other end of the second support rod 7 is fixedly connected to a salvage end support ring 8, the spring structure 5 includes a partition 502, one end of the partition 502 is provided with a second buffer spring 503, and the other end of the partition 502 is provided with a third buffer spring 504.

[0030] The drainage and gas production plunger with a buffering function of the present invention has the following working principle: the support ring 1 is threadedly connected to the first support rod 2 and then locked with a set screw, the plunger body 4 is threadedly connected to the first support rod 2 through a retaining ring 3, and the relative positions are adjusted, the first support rod 2 presses the spring structure 5, the set screw tightens the retaining ring 3 to prevent loosening, the end cover 6 is threadedly connected to the plunger body 4 and presses the spring structure 5, the set screw tightens the end cover to prevent loosening, the salvage end support ring 8 is threadedly connected to the second support rod 7, and the set screw tightens the salvage end support ring 8 again to prevent loosening.

[0031] After the wellhead valve is opened, under the action of downhole pressure, when the plunger moves upward and contacts the spring seat, the plunger movement tends to stop under the simultaneous action of the wellhead spring in the plunger gas lift drainage gas production device and the spring structure 5 of the drainage gas production plunger with a buffering function, and the downhole liquid and gas are discharged; the inlet valve is closed, and the plunger moves downward to the upper end of the buffer positioner under the action of gravity, and the plunger stops moving under the simultaneous action of the spring at the buffer positioner end and the spring structure 5 in the plunger gas lift drainage gas production device; the above actions are repeated after the formation pressure is restored. By adding the spring structure 5, the damage to the spring at the buffer positioner end and the wellhead spring in the plunger gas lift drainage gas production device during the movement of the plunger is reduced, and the maintenance time of the device is extended by increasing the spring life.

[0032] Example 1

[0033] like Figure 1 As shown, the drainage and gas production plunger with a buffering function of the present invention includes a plunger body 4, the plunger body 4 is a hollow cylinder, a spring structure 5 is arranged in the plunger body 4, a retaining ring 3 is fixedly connected to the inner wall of the port at one end of the plunger body 4, and an end cover 6 is fixedly connected to the other end of the plunger body 4. The plunger body 4 is connected to the first support rod 2 through the retaining ring 3, and the plunger body 4 is connected to the second support rod 7 through the end cover 6. The two ends of the spring structure 5 are respectively in contact with one end of the first support rod 2 and one end of the second support rod 7. The other end of the first support rod 2 is fixedly connected to the support ring 1, and the other end of the second support rod 7 is fixedly connected to the salvage end support ring 8.

[0034] Example 2

[0035] like Figure 1-7 As shown, the water drainage and gas production plunger with a buffering function of the present invention comprises a plunger body 4, the plunger body 4 is a hollow cylinder, a spring structure 5 is arranged in the plunger body 4, a retaining ring 3 is fixedly connected to the inner wall of the port at one end of the plunger body 4, an end cover 6 is fixedly connected to the other end of the plunger body 4, the plunger body 4 is connected to the first support rod 2 through the retaining ring 3, the plunger body 4 is connected to the second support rod 7 through the end cover 6, two ends of the spring structure 5 are respectively in contact with one end of the first support rod 2 and one end of the second support rod 7, the other end of the first support rod 2 is fixedly connected to the support ring 1, and the other end of the second support rod 7 is fixedly connected to the salvage end support ring 8;

[0036] A flow groove is provided at the center of the first support rod 2;

[0037] The inner wall of the retaining ring 3 is provided with threads, and the annular surface of the retaining ring 3 is evenly provided with a plurality of flow holes;

[0038] The inner wall of the end cover 6 is provided with threads, and the annular surface of the end cover 6 is evenly provided with a plurality of flow holes.

[0039] Example 3

[0040] like Figure 1-7 As shown, the water drainage and gas production plunger with a buffering function of the present invention comprises a plunger body 4, the plunger body 4 is a hollow cylinder, a spring structure 5 is arranged in the plunger body 4, a retaining ring 3 is fixedly connected to the inner wall of the port at one end of the plunger body 4, an end cover 6 is fixedly connected to the other end of the plunger body 4, the plunger body 4 is connected to the first support rod 2 through the retaining ring 3, the plunger body 4 is connected to the second support rod 7 through the end cover 6, two ends of the spring structure 5 are respectively in contact with one end of the first support rod 2 and one end of the second support rod 7, the other end of the first support rod 2 is fixedly connected to the support ring 1, and the other end of the second support rod 7 is fixedly connected to the salvage end support ring 8;

[0041] A flow groove is provided at the center of the first support rod 2;

[0042] The inner wall of the retaining ring 3 is provided with threads, and the annular surface of the retaining ring 3 is evenly provided with a plurality of flow holes;

[0043] The inner wall of the end cover 6 is provided with threads, and the annular surface of the end cover 6 is evenly provided with a plurality of flow holes;

[0044] The spring structure 5 includes a first buffer spring 501 .

[0045] Example 4

[0046] like Figure 8As shown, the water drainage and gas production plunger with a buffering function of the present invention comprises a plunger body 4, the plunger body 4 is a hollow cylinder, a spring structure 5 is arranged in the plunger body 4, a retaining ring 3 is fixedly connected to the inner wall of the port at one end of the plunger body 4, an end cover 6 is fixedly connected to the other end of the plunger body 4, the plunger body 4 is connected to the first support rod 2 through the retaining ring 3, the plunger body 4 is connected to the second support rod 7 through the end cover 6, two ends of the spring structure 5 are respectively in contact with one end of the first support rod 2 and one end of the second support rod 7, the other end of the first support rod 2 is fixedly connected to the support ring 1, and the other end of the second support rod 7 is fixedly connected to the salvage end support ring 8;

[0047] A flow groove is provided at the center of the first support rod 2;

[0048] The inner wall of the retaining ring 3 is provided with threads, and the annular surface of the retaining ring 3 is evenly provided with a plurality of flow holes;

[0049] The inner wall of the end cover 6 is provided with threads, and the annular surface of the end cover 6 is evenly provided with a plurality of flow holes;

[0050] The spring structure 5 includes a partition plate 502 , a second buffer spring 503 is disposed at one end of the partition plate 502 , and a third buffer spring 504 is disposed at the other end of the partition plate 502 .

[0051] The drainage and gas production plunger with a buffering function of the present invention has the advantages of reducing damage to the spring at the buffering positioner end and the wellhead spring in the plunger gas lift drainage and gas production device during plunger movement, extending the device maintenance time and service life by increasing the spring life.

Claims

1. A water drainage and gas collection plunger with a buffering function, characterized in that: The invention comprises a plunger body (4), wherein the plunger body (4) is a hollow cylinder, a spring structure (5) is arranged inside the plunger body (4), a retaining ring (3) is fixedly connected to the inner wall of the port at one end of the plunger body (4), and an end cover (6) is fixedly connected to the other end of the plunger body (4), the plunger body (4) is connected to a first support rod (2) through the retaining ring (3), and the plunger body (4) is connected to a second support rod (7) through the end cover (6), and two ends of the spring structure (5) are respectively in contact with one end of the first support rod (2) and one end of the second support rod (7), the other end of the first support rod (2) is fixedly connected to a support ring (1), and the other end of the second support rod (7) is fixedly connected to a salvage end support ring (8).

2. The water drainage and gas collection plunger with buffering function according to claim 1, characterized in that: A flow groove is provided at the center of the first support rod (2).

3. The water drainage and gas collection plunger with buffering function according to claim 1, characterized in that: The inner wall of the retaining ring (3) is provided with threads.

4. The water drainage and gas collection plunger with buffering function according to claim 1, characterized in that: The annular surface of the baffle ring (3) is evenly provided with a plurality of flow holes.

5. The water drainage and gas collection plunger with buffering function according to claim 1, characterized in that: The inner wall of the end cover (6) is provided with threads, and the annular surface of the end cover (6) is evenly provided with a plurality of flow holes.

6. The water drainage and gas collection plunger with buffering function according to claim 1, characterized in that: The spring structure (5) comprises a first buffer spring (501).

7. The water drainage and gas collection plunger with buffering function according to claim 1, characterized in that: The spring structure (5) comprises a partition (502), a second buffer spring (503) is arranged at one end of the partition (502), and a third buffer spring (504) is arranged at the other end of the partition (502).