Intelligent control motion plunger

Abstract

The application discloses a kind of intelligent control motion plunger, including buffer seat, buffer seat is connected with lower joint, lower joint is connected with rubber cylinder support, rubber cylinder support is connected with center cylinder, center cylinder is connected with fishing joint thread, upper mandrel is installed in rubber cylinder support, upper mandrel is connected with lower mandrel thread, drive motor connects upper mandrel, rubber cylinder support outer diameter connects vulcanized rubber cylinder, vulcanized rubber cylinder inner cavity is communicated with hydraulic hole and hydraulic cavity and liquid flow cavity;Insert pin is installed in the eccentric hole of center cylinder and is connected with pressure transmitter and acceleration sensor respectively, the application solves the problems that the gap between traditional plunger and oil pipe cannot be adjusted, the plunger cannot reach wellhead, liquid slip loss is serious, the depth of throwing cannot be adjusted, downhole data cannot be collected, the position depth of plunger in wellbore cannot be monitored and calculated, running speed and the problem that plunger down slowly and the low efficiency of drainage and production.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas field development and production process, and relates to an intelligent control moving plunger. BACKGROUND

[0002] In the middle and later stages of natural gas well development and production, wellbore liquid accumulation gradually increases, which will cause the gas well production to decline, and eventually lead to the shutdown of the gas well due to excessive liquid accumulation. In view of the downhole liquid accumulation problem, the production site usually uses a traditional plunger with a columnar structure for water drainage and gas production. Due to the continuous increase of liquid discharge in the middle and later stages of production, the reservoir pressure thrust is not enough to push the plunger to move to the wellhead, causing the drainage and production to fail. At the same time, when the traditional plunger is used for water drainage and gas production on site, the gap between the plunger and the inner wall of the oil pipe is fixed and cannot be adjusted, liquid slip loss is serious, the plunger depth cannot be adjusted according to the liquid accumulation, the plunger descends slowly, downhole data cannot be monitored and collected, the position depth and movement speed of the plunger in the wellbore cannot be monitored and calculated, the plunger cannot be used for liquid drainage in low-pressure and high-liquid discharge wellbores, and the water drainage and gas production efficiency is low, which cannot meet the actual needs of the construction of smart oil and gas fields at the present stage. SUMMARY

[0003] The purpose of the present application is to provide an intelligent control moving plunger, which solves the problems of the traditional plunger in the water drainage and gas production technology, such as the unadjustable gap between the plunger and the oil pipe, the plunger cannot reach the wellhead, the serious liquid slip loss, the inability to adjust the depth, the inability to collect downhole data, the inability to monitor and calculate the position depth of the plunger in the wellbore, the slow descent of the plunger and the low drainage and production efficiency.

[0004] The technical scheme adopted by the present application is an intelligent control moving plunger, which comprises a buffer seat, the buffer seat is connected with a lower joint, the lower joint is connected with a rubber cylinder support through threads, the end of the rubber cylinder support away from the lower joint is connected with a center cylinder, and the center cylinder is connected with a fishing joint;

[0005] The rubber cylinder support is embedded with a sealing disc, the upper end of the sealing disc is connected with an upper mandrel through sliding sealing, the end of the upper mandrel away from the sealing disc is connected with a lower mandrel, the rubber cylinder support is externally sleeved with a vulcanized rubber cylinder, liquid injection plugs are arranged at the two ends of the vulcanized rubber cylinder, the liquid injection plugs at the two ends of the vulcanized rubber cylinder are arranged on one side of the upper mandrel and the lower mandrel respectively, and the vulcanized rubber cylinder and the rubber cylinder support are communicated through a hydraulic hole; the hydraulic hole serves as a channel for communicating the vulcanized rubber cylinder, the hydraulic cavity and the liquid flow cavity and transmitting hydraulic pressure;

[0006] The connecting sleeve coaxial with the center cylinder is connected in the center cylinder, and the pin is installed on both sides of the connecting sleeve, the acceleration sensor and the pressure transmitter are connected with the pin respectively, the battery pack is connected with the acceleration sensor and the pressure transmitter respectively, the battery pack is used for power supply of the control storage module and the driving motor, the battery pack is connected with the control storage module, the bearing is installed in the connecting sleeve, the screw rod is connected with the bearing, one end of the screw rod is screwed with the upper mandrel, the other end of the screw rod is screwed with the shaft coupling, and the shaft coupling is connected with the driving motor.

[0007] The application also has the characteristics that:

[0008] The small-diameter rod is provided with a gasket and a spring, the bottom of the lower connector is provided with an inner hole matched with the small-diameter rod, the spring and the small-diameter rod are embedded in the inner hole of the lower connector, the inner hole of the lower connector is provided with a locking cap, and the buffer seat is connected with the lower connector through the locking cap.

[0009] The outer diameter groove is provided with a centralizing ring.

[0010] The upper end of the limiting boss in the rubber tube support is installed with the upper mandrel, the upper mandrel is processed with a boss matched with the limiting boss in the inner hole of the rubber tube support, the movement of the upper mandrel is prevented from being out of limit and unable to return, the lower end of the limiting boss in the rubber tube support is installed with the lower mandrel, the lower mandrel is connected with the upper mandrel through threads, the upper mandrel, the sealing disc and the inner hole of the rubber tube support are sealed to form a hydraulic cavity, the lower mandrel is processed with a sealing boss, the sealing boss and the inner hole of the rubber tube support form a liquid flow cavity, and the injection plug is communicated with the hydraulic cavity and the liquid flow cavity.

[0011] The outer diameter of the rubber tube support is provided with an outer diameter boss, the outer diameter boss is sleeved with the vulcanized rubber tube through threads, and the end of the rubber tube support close to the buffer seat is provided with a convection hole; the convection hole and the bypass hole make the plunger fall faster and have smaller resistance in the well.

[0012] The vulcanized rubber tube is vulcanized by full fluorinated ether rubber and stainless steel, and has the characteristics of sealing, temperature resistance, wear resistance, high elasticity, acid and alkali resistance and the like.

[0013] The center cylinder is processed with a bypass hole, a test hole and a measurement hole, the test hole is used as a test channel of the pressure transmitter, the measurement hole is used as a test channel of the acceleration sensor, the test hole and the measurement hole are used as fluid collection test channels of the pressure transmitter and the acceleration sensor, and information collection is more convenient.

[0014] The pressure transmitter collects the annular fluid pressure value introduced by the test hole, outputs an electric control signal to the control storage module, the control storage module stores data and issues a control instruction to intelligently control the rotation of the driving motor, the driving motor drives the up and down mandrels to go up, the bypass hole is closed, the vulcanized rubber tube expands to seal the oil pipe and the plunger annulus, the pressure of the well bottom fluid acts on the vulcanized rubber tube and the plunger, so that the plunger goes up to the wellhead to complete the drainage; the driving motor drives the up and down mandrels to go down, the bypass hole is opened, the vulcanized rubber tube shrinks to unseal, and the plunger quickly falls from the wellhead to the wellbore;

[0015] The acceleration sensor detects the posture and motion speed of the plunger in the wellbore through the measuring hole, and stores the collected data into the control storage module; the collected acceleration data can be directly judged to determine the position depth of the plunger in the oil pipe after playback;

[0016] The center flow hole is provided with branch flow passages A and B on both sides of one end, and the bypass hole, the branch flow passages A and B and the center flow hole form a flow passage, and the connection of the bypass hole and the main flow passage can ensure that the plunger falls quickly, so that the vulcanized rubber tube is easy to unseal;

[0017] The center cylinder is provided with an outer diameter groove on the outer side, and the outer diameter groove is also provided with a centralizing ring;

[0018] The inner cavity formed by the threaded connection of the fishing barrel and the center cylinder seals the pin, the acceleration sensor, the pressure transmitter, the battery pack, the control storage module and the driving motor.

[0019] The beneficial effects of the present application are

[0020] The intelligent control motion plunger of the present application is used for downhole drainage of oil and gas wells, the bypass hole, the convection hole and the main flow hole of the plunger can ensure that the plunger falls quickly, and has acceleration and pressure test storage functions, can intelligently judge the position depth, motion posture and motion speed of the plunger in the wellbore according to the acceleration value, can intelligently control the forward and reverse rotation of the driving motor according to the annular pressure of the plunger, achieve the purpose of intelligently controlling the expansion and contraction of the vulcanized rubber tube and changing the annular gap of the plunger, can make the plunger quickly go down and enter the liquid surface depth which is intelligently controllable, the liquid does not slip when the plunger is pressed to go up, and can safely reach the wellhead to drain water, the drainage and gas production efficiency is high; meet the needs of low pressure and large liquid discharge wellbore for drainage. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of an intelligent control motion plunger of the present application;

[0022] Figure 2 is a working state schematic diagram of an intelligent control motion plunger of the present application;

[0023] Figure 3 is the present invention Figure 1 partial enlarged view of the bypass hole opening;

[0024] Figure 4 is the present invention Figure 2 partial enlarged view of the bypass hole closing;

[0025] Figure 5 is the present invention

[0026] Figure 6 is the present invention

[0027] In the figure, 1. Buffer seat, 2. Gasket, 3. Spring, 4. Centralizing ring, 5. Lower joint, 6. Locking cap, 7. Rubber cylinder support, 8. Lower mandrel, 9. Liquid injection plug, 10. Vulcanized rubber cylinder, 11. Upper mandrel, 12. Sealing disc, 13. Center tube, 14. Screw rod, 15. Fishing joint, 16. Bearing, 17. Pin, 18. Acceleration sensor, 19. Pressure transmitter, 20. Battery pack, 21. Control storage module, 22. Transition sleeve, 23. Sleeve, 24. Coupling, 25. Connection disc, 26. Nut, 27. Screw, 28. Protective cylinder, 29. Drive motor, 30. Bypass hole, 31. Test hole, 32. Convection hole, 33. Hydraulic hole, 34. Center flow channel hole, 35. Branch flow channel A, 36. Branch flow channel B, 37. Hydraulic cavity, 38. Liquid flow cavity, 39. Measuring hole. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0029] The present invention is a kind of intelligent control motion plunger, as Figure 1 shown, including buffer seat 1, buffer seat 1 is connected with lower joint 5 through locking cap 6, lower joint 5 is threadedly connected with rubber cylinder support 7, rubber cylinder support 7 is threadedly connected with center tube 13, center tube 13 is threadedly connected with fishing joint 15, the above connection constitutes the external structure of the present invention; The above structure or components are installed in the cylindrical space between buffer seat 1, lower joint 5, rubber cylinder support 7, center tube 13 and fishing joint 15, wherein buffer seat 1, lower joint 5, rubber cylinder support 7, center tube 13 and fishing joint 15 are all threadedly connected;

[0030] Gasket 2 and spring 3 are sleeved on the small diameter rod of buffer seat 1, spring 3 and the small diameter rod of buffer seat are placed in the inner hole of lower joint 5, locking cap 6 in the inner hole of lower joint 5 connects and fixes buffer seat 1 with lower joint 5, centralizing ring 4 is installed in the outer diameter groove of lower joint 5, the basic function of this part is to buffer and centralize the whole plunger;

[0031] The inner hole of the rubber sleeve support 7 is threadedly connected with a sealing disc 12, the sealing disc 12 is in sliding sealing with the upper shaft 11, the upper end of the limiting boss in the inner hole of the rubber sleeve support 7 is installed with the upper shaft 11, the lower end of the limiting boss in the inner hole of the rubber sleeve support 7 is accommodated with the lower shaft 8, the lower shaft 8 is threadedly connected with the upper shaft 11, the upper shaft 11 and the sealing disc 12 are in sealing with the inner hole of the rubber sleeve support 7 to form a hydraulic cavity 37, the lower shaft 8 is in sealing with the inner hole of the rubber sleeve support 7 to form a flow cavity 38; the outer diameter of the rubber sleeve support 7 is processed with a convection hole 32, a hydraulic hole 33, a liquid injection hole and a boss, the boss is sleeved with the vulcanization rubber sleeve 10 through threads at both ends, the liquid injection plug 9 is installed in the liquid injection hole of the rubber sleeve support 7 at both ends of the vulcanization rubber sleeve 10, the liquid in the hydraulic cavity 37 and the flow cavity 38 injected by the liquid injection plug 9 enters the inner cavity of the vulcanization rubber sleeve 10 through the hydraulic hole 33; the convection hole 32 forms a normally open bypass passage; the basic function of the part is that the driving motor 29 drives the upper shaft 11 and the lower shaft 8 to go up to respectively compress the liquid in the hydraulic cavity 37 and the flow cavity 38, the vulcanization rubber sleeve 10 expands outward (inflates) under the action of the hydraulic pressure, and two sections of annular space between the oil pipe and the plunger are sealed, as shown in the figure, when the driving motor 29 drives the upper shaft 11 and the lower shaft 8 to go down, the liquid in the inner cavity of the vulcanization rubber sleeve 10 returns to the hydraulic cavity 37 and the flow cavity 38, the vulcanization rubber sleeve shrinks, and the annular space between the plunger and the oil pipe is not sealed. The normally open bypass passage formed by the convection hole 32 can make the plunger fall quickly; Figure 2

[0032] The central sleeve 13 is installed with a centralizing ring 4 in the groove on the outer diameter, the two ends of the centralizing ring 4 play a role in centralizing the plunger in the oil pipe; the central sleeve 13 is processed with a bypass hole 30, a test hole 31 and a measuring hole 39, as shown in the figure, the bypass hole 30 is in communication with the inner cavity of the vulcanization rubber sleeve 10 and the annular space between the oil pipe and the plunger, the test hole 31 is in communication with the inner cavity of the vulcanization rubber sleeve 10 and the annular space between the oil pipe and the plunger, and the measuring hole 39 is in communication with the inner cavity of the vulcanization rubber sleeve 10 and the annular space between the oil pipe and the plunger; Figure 6 ​The bypass hole 30 forms a flow passage with the branch channel A 35, the branch channel B 36 and the central flow channel hole 34. The test hole 31 serves as a test passage for the pressure transmitter 19, and the measuring hole 39 serves as a test passage for the acceleration sensor 18, so that the test pressure acceleration is more convenient and accurate. The sleeve 23 is screwed on the upper end of the central cylinder 13, the pin 17 is installed in the eccentric hole of the central cylinder 13 outside the sleeve 23, the pin 17 is connected with the acceleration sensor 18 and the pressure transmitter 19 respectively, the acceleration sensor 18 and the pressure transmitter 19 are connected with the battery pack 20, the battery pack 20 is connected with the control storage module 21, the control storage module 21 is close to the sleeve 23, the bearing 16 is installed in the sleeve 23, the bearing 16 supports the screw rod 14, one end of the screw rod 14 is screwed on the upper mandrel 11, one end of the screw rod 14 is connected with the transition sleeve 22, the transition sleeve 22 is screwed on the coupling 24, the coupling 24 is connected with the driving motor 29, the driving motor 29 is sleeved with the protection cylinder 28, the protection cylinder 28 is fixed with the fixing disc 25 through the screw 27 and the nut 26, and the fixing disc 25 is screwed on the sleeve 23. The fishing joint 15 and the central cylinder 13 are screwed to form a cavity, and the pin 17, the acceleration sensor 18, the pressure transmitter 19, the battery pack 20, the control storage module 21 and the driving motor 29 are sealed in the cavity; the basic function of this part is that the pressure transmitter 19 collects the annular fluid pressure value introduced by the test hole, outputs an electric control signal to the control storage module 21, the control storage module 21 sends a control instruction to control the rotation of the driving motor 29, when the driving motor 29 drives the upper mandrel 11 to go up, the bypass hole 30 is closed, and when the driving motor 29 drives the upper mandrel 11 to go down, the bypass hole 30 is communicated, and the fluid enters the plunger and the annulus of the oil pipe through the main flow channel 34, the branch flow channel AB and the bypass hole 30. Figure 4 As shown, the hydraulic cavity 37 and the liquid flow cavity 38 are compressed, the hydraulic pressure makes the vulcanized rubber cylinder 10 expand (swell), and the vulcanized rubber cylinder 10 seals the inner wall of the oil pipe. When the driving motor 29 drives the upper mandrel 11 to go down, the bypass hole 30 is communicated, and the fluid enters the plunger and the annulus of the oil pipe through the main flow channel 34, the branch flow channel AB and the bypass hole 30. Figure 3 As shown, the volume of the hydraulic cavity 37 and the liquid flow cavity 38 increases, the liquid in the vulcanized rubber cylinder 10 flows back, the liquid pressure decreases, the vulcanized rubber cylinder 10 shrinks and unseals.

[0033] The intelligent control movement plunger has the advantages that the bypass hole, the convection hole and the main flow hole of the plunger can ensure that the plunger falls quickly, and the plunger has the acceleration and pressure test storage functions, can intelligently judge the movement posture and speed of the plunger in the wellbore according to the acceleration value, can judge the position depth of the plunger in the oil pipe, can intelligently control the driving motor to reverse according to the annular pressure of the plunger, can achieve the purpose of intelligently controlling the vulcanized rubber cylinder to expand and contract and changing the annular gap of the plunger, can make the plunger quickly go down and enter the liquid surface at a controllable depth, can make the liquid not slip when the plunger is pressed to go up and can safely reach the wellhead to drain water, and the drainage and gas recovery efficiency is high. The plunger can meet the needs of draining low-pressure and large-liquid-output wellbores.

Claims

1. A smart control motion plunger, characterized by, Including buffer seat (1), buffer seat (1) is connected with lower joint (5), lower joint (5) is connected with rubber cylinder support (7) by screw thread, one end of rubber cylinder support (7) away from lower joint (5) is connected with center cylinder (13), center cylinder (13) is connected with fishing joint (15); The rubber cylinder support (7) is embedded with a sealing disc (12), the upper end of the sealing disc (12) is slidably connected with an upper mandrel (11), the lower end of the upper mandrel (11) is connected with a lower mandrel (8), the rubber cylinder support (7) is sleeved with a vulcanized rubber cylinder (10), the outer diameter of the rubber cylinder support (7) is provided with liquid injection plugs (9) at both ends of the vulcanized rubber cylinder (10), and the liquid injection plugs (9) are located on one side of the upper mandrel (11) and the lower mandrel (8), respectively, and the vulcanized rubber cylinder (10) is communicated with the rubber cylinder support (7) through a hydraulic hole (33). The outer diameter of the rubber cylinder support (7) is provided with an outer diameter boss, and the outer diameter boss is sleeved with the vulcanized rubber cylinder (10) at both ends by screw thread, and the rubber cylinder support (7) is provided with a convection hole (32) at one end close to the buffer seat (1). The center cylinder (13) is connected with a connecting sleeve (23) coaxial with the center cylinder (13), the connecting sleeve (23) is provided with a pin (17) on both sides, the pin (17) is connected with an acceleration sensor (18) and a pressure transmitter (19), respectively, the acceleration sensor (18) and the pressure transmitter (19) are connected with a battery pack (20), the battery pack (20) is connected with a control storage module (21), a bearing (16) is installed in the connecting sleeve (23), the bearing (16) is connected with a screw rod (14), one end of the screw rod (14) is connected with the upper mandrel (11) by screw thread, the other end of the screw rod (14) is connected with a transition sleeve (22), the transition sleeve (22) is connected with a shaft coupling (24), and the shaft coupling (24) is connected with a driving motor (29). The center cylinder (13) is provided with a bypass hole (30), a test hole (31) and a measurement hole (39), the test hole (31) is used as a test channel of the pressure transmitter (19), and the measurement hole (39) is used as a test channel of the acceleration sensor (18). The upper mandrel (11) is provided with a center flow hole (34), and the center flow hole (34) is provided with a branch flow channel A (35) and a branch flow channel B (36) on both sides of one end, and the bypass hole (30), the branch flow channel A (35) and the branch flow channel B (36) form a flow channel passage with the center flow hole (34).

2. The smart control motion plunger of claim 1, wherein, The buffer seat (1) is provided with a small diameter rod, a washer (2) and a spring (3) are sleeved on the small diameter rod, an inner hole matched with the small diameter rod is formed in the bottom of the lower joint (5), the spring (3) and the small diameter rod are embedded in the inner hole of the lower joint (5), a locking cap (6) is arranged in the inner hole of the lower joint (5), and the buffer seat (1) is connected with the lower joint (5) through the locking cap (6).

3. The smart control motion plunger of claim 1, wherein, The lower joint (5) is provided with an outer diameter groove around the outer side, and a centralizing ring (4) is installed in the outer diameter groove.

4. The smart control motion plunger of claim 1, wherein, The rubber cylinder support (7) is internally provided with a limiting boss, the upper mandrel (11) is installed on the upper end of the limiting boss in the rubber cylinder support (7), the upper mandrel (11) is processed with a boss matched with the limiting boss in the inner hole of the rubber cylinder support, the lower end of the limiting boss in the rubber cylinder support (7) is installed with the lower mandrel (8), the lower mandrel (8) is threadedly connected with the upper mandrel (11), the upper mandrel (11), the sealing disc (12) and the inner hole of the rubber cylinder support (7) are sealed to form a hydraulic cavity (37), the lower mandrel (8) and the inner hole of the rubber cylinder support (7) are sealed to form a liquid flow cavity (38), and the liquid injection plug (9) is communicated with the hydraulic cavity (37) and the liquid flow cavity (38) respectively.

5. The smart control motion plunger of claim 1, wherein, The vulcanized rubber cylinder (10) is vulcanized by using perfluoroether rubber and stainless steel.

6. The smart control motion plunger of claim 1, wherein, The central cylinder (13) is provided with an outer diameter groove around the outer side, and a centralizing ring (4) is also installed in the outer diameter groove.

7. The smart control motion plunger of claim 1, wherein, The inner cavity formed by the fishing joint (15) and the central cylinder (13) in threaded connection seals the insertion pin (17), the acceleration sensor (18), the pressure transmitter (19), the battery pack (20), the control storage module (21) and the driving motor (29).

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