Wellhead oil and gas mixed production device

Abstract

The application discloses a wellhead oil-gas mixed production device, which comprises a cylinder, an annular fixing groove is formed in the right side of the outer side wall of the cylinder, a back cover is fixed to the inner side wall of the annular fixing groove, a fixing cylinder is fixed to the outer side wall of the cylinder, an end cover is fixed to the inside of the fixing cylinder, a connecting pipe is fixed to the end cover, a flowmeter is fixed to the other end of the connecting pipe, a sleeve is fixed to the other end of the flowmeter, a mounting groove is formed in the bottom of the back cover and the right side of the cylinder, a sealing valve is arranged in the mounting groove, with the reciprocating movement of the pumping rod, when the lower stroke, the negative pressure is generated in the cylinder to make the right sealing valve close, the negative pressure makes the upper sealing valve open, the gas in the sleeve enters the cylinder until the pressure is stable, the upper sealing valve is closed and the sleeve gas stops entering; when the upper stroke, the pressure in the cylinder rises to make the right sealing valve open and the upper sealing valve close, the upper and lower strokes are cyclically reciprocated to make the sleeve gas enter the gathering and transportation process.

Description

Technical Field

[0001] This invention relates to the field of oil and gas co-production technology, specifically to a wellhead oil and gas co-production device. Background Technology

[0002] Casing gas in oil wells is mainly formed during oil extraction when natural gas separates from the oil as the bottom hole pressure gradually decreases. Some of this gas is extracted along with the well fluid, while the rest enters the annular space between the oil well and casing, forming casing gas. The main component of casing gas is alkanes, with methane being the majority, and it is flammable and explosive. If this natural gas is not effectively recovered, it will lead to serious resource waste and pollute the surrounding air. Therefore, under the dual pressures of resource demand and safety hazards, how to effectively recover and efficiently utilize casing gas has become a key focus of current oil extraction operations.

[0003] Currently, four main processes are used for casing gas recovery in domestic oilfields: 1. Pressure regulating valve recovery: casing gas pressure > surface tubing back pressure, but this method is prone to gas lock-up; 2. Compressor-assisted gas extraction and pressurization recovery: this method requires significant investment and is difficult to implement at the well site; 3. Separate gas gathering pipeline recovery: this method requires large construction investment and is also affected by pipeline back pressure, increasing the casing gas recovery pressure; 4. Synchronous rotary oil and gas mixing and transportation device recovery: this method is generally used for oil and gas mixing and transportation at booster stations, but it cannot recover casing gas from the well site and is difficult to maintain later. In summary, these four casing gas recovery technologies have different characteristics and varying application effects. However, none of them are the most ideal recovery methods. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a wellhead oil and gas co-production device, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a wellhead oil and gas co-production device, comprising a cylinder, an annular fixing groove on the right side of the outer side wall of the cylinder, a rear cover fixed to the inner side wall of the annular fixing groove, a fixing cylinder fixed to the outer side wall of the cylinder, an end cover fixed inside the fixing cylinder, a connecting pipe fixed to the end cover, a flow meter fixed to the other end of the connecting pipe, a sleeve fixed to the other end of the flow meter, mounting grooves on the bottom of the rear cover and the right side of the cylinder, a sealing valve inside the mounting groove, the sealing valve comprising a valve body, a sealing plate, a pad, a fixing plate, a connecting plate, a support rod, a rotating rod, and two torsion springs.

[0006] Preferably, the outer wall of the valve body and the inner wall of the mounting groove are fixedly connected, the end of the support rod near the valve body and the side of the valve body away from the mounting groove are fixedly connected, the support rod has a movable groove inside, the outer walls of the connecting plate and the fixing plate are fixedly connected, and the fixing plate, the pad and the sealing plate are fixedly connected by sealing bolts and nuts.

[0007] Preferably, the movable groove has two circular grooves inside, the rotating rod passes through the connecting plate and is fixedly connected to the connecting plate, the two ends of the rotating rod are respectively fixedly connected to the opposite sides of the two circular grooves, the torsion spring is sleeved on the outside of the rotating rod, and the two ends of the torsion spring are respectively fixedly connected to the outer wall of the rotating rod and the inner wall of the circular groove.

[0008] Preferably, both the interior of the end cap and the interior of the cylinder are provided with sealing mechanisms. The sealing mechanism includes a rubber sealing ring, a pressure ring, multiple moving rods, multiple springs, a connecting ring, a fixing ring, and a sealing ring. The outer side wall of the annular fixing groove is provided with an annular groove, and the inner side wall of the annular groove and the outer side wall of the end cap are provided with an annular placement groove.

[0009] Preferably, an annular receiving groove is formed inside the annular placement groove on the side near the connecting ring. Multiple circular holes are formed inside the annular receiving groove on the side away from the annular placement groove. A spring hole is formed at the end of each circular hole away from the annular receiving groove. The rubber sealing ring is located inside the annular placement groove, and a pressure groove is formed at the end of the rubber sealing ring near the circular hole.

[0010] Preferably, the pressure ring is located inside the annular storage groove, the outer wall of the moving rod is slidably connected to the inner wall of the circular hole, the end of the moving rod away from the spring hole is fixedly connected to the side of the pressure ring away from the rubber sealing ring, the end of the moving rod away from the pressure ring is fixedly connected to the connecting ring, and the outer walls of the two fixed rings are respectively fixedly connected to the inner wall of the rear cover and the inner wall of the fixed cylinder.

[0011] Preferably, the spring is sleeved on the outside of the moving rod, the spring is located inside the spring hole, the two ends of the spring are fixedly connected to the spring hole and the connecting ring respectively, the outer walls of the two sealing rings are fixedly connected to the inner wall of the rear cover and the inner side of the fixing cylinder respectively, and the outer walls of the two fixing rings are fixedly connected to the inner wall of the rear cover and the inner side of the fixing cylinder respectively.

[0012] Beneficial effects This invention provides a wellhead oil and gas co-production device. Compared with the prior art, it has the following advantages: 1. This wellhead oil and gas co-production device, through the installation of two sealing valves, creates a negative pressure inside the cylinder during the downstroke as the sucker rod reciprocates. This pressure sucks in the right-side sealing plate, preventing back pressure from the well group from flowing into the cylinder. The cylinder pressure drops, and when it falls below the connecting pipe pressure, the negative pressure pulls in the upper fixed plate, opening the upper sealing valve. Gas from inside the casing enters the cylinder until the pressure at both ends stabilizes. Then, the upper torsion spring rotates the upper connecting plate and fixed plate upwards to close the valve, sealing the upper valve body and stopping gas from entering the wellhead. During the upstroke, the gas inside the cylinder... As the pressure rises and exceeds the well group back pressure, the strong pressure pushes the right-side sealing plate to move, thus opening the right-side sealing valve. Oil and gas enter the single-well oil production pipeline process and are input to the downstream station. The up and down strokes cycle repeatedly, allowing the casing gas to enter the gathering and transportation process successively, creating conditions for the smooth centralized recovery and utilization of casing gas. Moreover, when the casing pressure exceeds the casing pressure recovery value, the upper sealing valve opens, and the associated gas in the casing enters the oil production pipeline process and is transported to the downstream station, thereby achieving the purpose of effectively recovering casing gas. The sealing valve adopts a flap structure, which can quickly reseal with the cooperation of a torsion spring and has good pressure bearing capacity.

[0013] 2. This wellhead oil and gas co-production device, through the setting of a sealing mechanism, when installing and fixing the rear cover and end cover, the fixing ring squeezes the connecting ring, the connecting ring pushes the moving rod to move, the moving rod pushes the pressure ring to move, and the end of the pressure ring away from the moving rod is inserted into the inside of the pressure groove. This will open the rubber sealing ring to both sides, so that the inner and outer walls of the rubber sealing ring are tightly fitted with the sealing ring and the annular placement groove, respectively. This can improve the sealing effect and prevent leakage due to the lack of sealing between the rear cover and the cylinder and between the end cover and the fixing cylinder. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a cross-sectional view of the cylindrical body and the rear cover in this invention. Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A; Figure 5 This is a cross-sectional view of the cylindrical body in this invention; Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point B; Figure 7 This is a cross-sectional view of the right-side sealing valve support rod in this invention. Figure 8 This is a side view of the sealing valve on the right side in this invention.

[0015] In the diagram: 1. End cap; 2. Fixed cylinder; 3. Rear cover; 4. Cylinder body; 5. Sleeve; 6. Flow meter; 7. Connecting pipe; 8. Sealing mechanism; 9. Rubber sealing ring; 10. Fixed ring; 11. Sealing plate; 12. Valve body; 13. Support rod; 14. Sealing valve; 15. Sealing bolt; 16. Gasket; 17. Connecting ring; 18. Sealing ring; 19. Pressure groove; 20. Pressure ring; 21. Moving rod; 22. Spring; 23. Mounting groove; 24. Spring hole; 25. Annular groove; 26. Annular fixing groove; 27. Movable groove; 28. Round hole; 29. ​​Annular storage groove; 30. Annular placement groove; 31. Fixed plate; 32. Round groove; 33. Connecting plate; 34. Torsion spring; 35. Rotating rod; 36. Nut. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-8This invention provides a technical solution: a wellhead oil and gas co-production device, comprising a cylinder 4, an annular fixing groove 26 formed on the right side of the outer side wall of the cylinder 4, a rear cover 3 fixed on the inner side wall of the annular fixing groove 26, a fixing cylinder 2 fixed on the outer side wall of the cylinder 4, an end cover 1 fixed inside the fixing cylinder 2, a connecting pipe 7 fixed to the end cover 1, a flow meter 6 fixed to the other end of the connecting pipe 7, and a sleeve 5 at the other end of the flow meter 6. Installation grooves 23 are formed at the bottom of the rear cover 3 and on the right side of the cylinder 4, and a sealing valve 14 is provided inside the installation groove 23. The sealing valve 14 includes a valve body 12 and a sealing plate. 11. A pad 16, a fixing plate 31, a connecting plate 33, a support rod 13, a rotating rod 35, and two torsion springs 34 are fixedly connected to the outer wall of the valve body 12 and the inner wall of the mounting groove 23. The end of the support rod 13 near the valve body 12 is fixedly connected to the side of the valve body 12 away from the mounting groove 23. A movable groove 27 is provided inside the support rod 13. The connecting plate 33 is fixedly connected to the outer wall of the fixing plate 31. The fixing plate 31, the pad 16, and the sealing plate 11 are fixedly connected by sealing bolts 15 and nuts 36. Two circular grooves 32 are provided inside the movable groove 27, through which the rotating rod 35 passes. The rotating rod 35 is fixedly connected to the connecting plate 33. Both ends of the rotating rod 35 are fixedly connected to the opposite sides of the two circular grooves 32. A torsion spring 34 is sleeved on the outside of the rotating rod 35, with both ends fixedly connected to the outer wall of the rotating rod 35 and the inner wall of the circular groove 32, respectively. During the downstroke, a negative pressure is generated inside the cylinder 4, sucking in the right-side sealing plate 11. This prevents the back pressure of the well group from flowing into the cylinder 4, causing the pressure in the cylinder 4 to drop. When the pressure drops below that of the connecting pipe 7, the upper sealing valve 14 opens, allowing gas from inside the casing 5 to enter the cylinder 4 until the pressure reaches the two... When the end pressure is stable, the upper sealing valve 14 closes, and the gas inside casing 5 stops entering the wellhead. During the upstroke, the internal pressure of the cylinder 4 rises. When it exceeds the back pressure of the well group, the sealing valve 14 on the right opens, and oil and gas enter the single-well oil production pipeline process and are input to the downstream station. The upstroke and downstroke cycles repeatedly, which can make the gas in casing 5 enter the gathering and transportation process one after another, creating conditions for the smooth centralized recovery and utilization of the gas in casing 5. Moreover, after the pressure in casing 5 exceeds the casing pressure recovery value, the upper sealing valve 14 opens, and the associated gas in casing 5 enters the oil production pipeline process and is transported to the downstream station, thereby achieving the purpose of effectively recovering the gas in casing 5.

[0018] Furthermore, both the interior of the end cap 1 and the interior of the cylinder 4 are provided with sealing mechanisms 8. The sealing mechanism 8 includes a rubber sealing ring 9, a pressure ring 20, multiple moving rods 21, multiple springs 22, a connecting ring 17, a fixing ring 10, and a sealing ring 18. The outer wall of the annular fixing groove 26 is provided with an annular groove 25. The inner wall of the annular groove 25 and the outer wall of the end cap 1 are provided with an annular placement groove 30. The interior of the annular placement groove 30 is provided with an annular storage groove 29 on the side near the connecting ring 17. Multiple round holes 28 are provided inside the annular storage groove 29 on the side away from the annular placement groove 30. A spring hole 24 is provided at the end of each round hole 28 away from the annular storage groove 29. A rubber sealing ring 9 is located inside the annular placement groove 30. A pressure groove 19 is provided at the end of the rubber sealing ring 9 near the round hole 28. A pressure ring 20 is located inside the annular storage groove 29. The outer wall of the moving rod 21 is slidably connected to the inner wall of the round hole 28. The end of the moving rod 21 away from the spring hole 24 is fixedly connected to the side of the pressure ring 20 away from the rubber sealing ring 9. The end of the moving rod 21 away from the pressure ring 20 is fixedly connected to the connecting ring 17. The outer walls of the two fixing rings 10 are respectively connected to the inner wall of the rear cover 3 and the inner wall of the fixing cylinder 2. The sidewall is fixedly connected, and the spring 22 is sleeved on the outside of the moving rod 21. The spring 22 is located inside the spring hole 24. The two ends of the spring 22 are fixedly connected to the spring hole 24 and the connecting ring 17, respectively. The outer walls of the two sealing rings 18 are fixedly connected to the inner wall of the rear cover 3 and the inner side of the fixed cylinder 2, respectively. The outer walls of the two fixing rings 10 are fixedly connected to the inner wall of the rear cover 3 and the inner side of the fixed cylinder 2, respectively. The fixing ring 10 squeezes the connecting ring 17, and the connecting ring 17 pushes the moving rod 21 to move. The moving rod 21 pushes the pressure ring 20 to move. The end of the pressure ring 20 away from the moving rod 21 is inserted into the inside of the pressure groove 19. This will open the rubber sealing ring 9 to both sides, which can improve the sealing effect.

[0019] During operation, when installing and fixing the rear cover 3 and end cover 1, the fixing ring 10 squeezes the connecting ring 17, the connecting ring 17 pushes the moving rod 21 to move, and the moving rod 21 pushes the pressure ring 20 to move. The end of the pressure ring 20 away from the moving rod 21 is inserted into the inside of the pressure groove 19. This will spread the rubber sealing ring 9 to both sides, so that the inner and outer walls of the rubber sealing ring 9 are tightly fitted with the sealing ring 18 and the annular placement groove 30, respectively. This can improve the sealing effect and prevent leakage due to gaps in the connection between the rear cover 3 and the cylinder 4 and between the end cover 1 and the fixing cylinder 2. As the sucker rod reciprocates, during the downstroke, a negative pressure is generated inside the cylinder 4, which sucks up the right sealing plate 11. This prevents the right sealing valve 14 from connecting the well group back pressure to the cylinder, and the cylinder pressure drops. When it is lower than the pressure of the connecting pipe 7, the negative pressure will suck up the upper fixing plate 31, and the upper sealing valve 14 will open, allowing the gas inside the casing 5 to escape. The gas enters the casing until the pressure at both ends stabilizes. The upper torsion spring 34 rotates upwards with the upper connecting plate 33 and the fixing plate 31 to close the casing. The upper sealing plate 11 seals the upper valve body 12, and the gas inside the casing 5 stops entering the wellhead. During the upstroke, the pressure inside the casing rises. When it exceeds the back pressure of the well group, the strong pressure pushes the right sealing plate 11 to move, thus opening the right sealing valve 14. Oil and gas enter the single well oil production pipeline process and are input to the downstream station. The upstroke and downstroke cycles repeatedly, which allows the gas in the casing 5 to enter the gathering and transportation process one after another, creating conditions for the smooth centralized recovery and utilization of the gas in the casing 5. After the pressure in the casing 5 exceeds the casing pressure recovery value, the upper sealing valve 14 opens, and the associated gas in the casing 5 enters the oil production pipeline process and is transported to the downstream station, thereby achieving the purpose of effectively recovering the gas in the casing 5. The sealing valve 14 adopts a flap structure, which can quickly reseal with the cooperation of the torsion spring 34 and has good pressure bearing capacity.

[0020] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wellhead oil and gas co-production device, comprising a cylinder (4), characterized in that: An annular fixing groove (26) is provided on the right side of the outer wall of the cylinder (4). A rear cover (3) is fixed on the inner wall of the annular fixing groove (26). A fixing cylinder (2) is fixed on the outer wall of the cylinder (4). An end cover (1) is fixed inside the fixing cylinder (2). A connecting pipe (7) is fixed on the end cover (1). A flow meter (6) is fixed at the other end of the connecting pipe (7). A sleeve (5) is fixed at the other end of the flow meter (6). An installation groove (23) is provided at the bottom of the rear cover (3) and on the right side of the cylinder (4). A sealing valve (14) is provided inside the installation groove (23). The sealing valve (14) includes a valve body (12), a sealing plate (11), a pad (16), a fixing plate (31), a connecting plate (33), a support rod (13), a rotating rod (35), and two torsion springs (34).

2. The wellhead oil and gas co-production device according to claim 1, characterized in that: The outer wall of the valve body (12) and the inner wall of the mounting groove (23) are fixedly connected. The end of the support rod (13) near the valve body (12) and the side of the valve body (12) away from the mounting groove (23) are fixedly connected. The support rod (13) has an movable groove (27) inside. The outer wall of the connecting plate (33) and the fixing plate (31) are fixedly connected. The fixing plate (31), the pad (16) and the sealing plate (11) are fixedly connected by sealing bolts (15) and nuts (36).

3. The wellhead oil and gas co-production device according to claim 2, characterized in that: The movable groove (27) has two circular grooves (32) inside. The rotating rod (35) passes through the connecting plate (33) and is fixedly connected to the connecting plate (33). The two ends of the rotating rod (35) are fixedly connected to the opposite sides of the interior of the two circular grooves (32). The torsion spring (34) is sleeved on the outside of the rotating rod (35). The two ends of the torsion spring (34) are fixedly connected to the outer wall of the rotating rod (35) and the inner wall of the circular groove (32) respectively.

4. The wellhead oil and gas co-production device according to claim 3, characterized in that: Both the end cap (1) and the cylinder (4) are provided with sealing mechanisms (8). The sealing mechanism (8) includes a rubber sealing ring (9), a pressure ring (20), multiple moving rods (21), multiple springs (22), a connecting ring (17), a fixing ring (10), and a sealing ring (18). The outer wall of the annular fixing groove (26) is provided with an annular groove (25). The inner wall of the annular groove (25) and the outer wall of the end cap (1) are provided with an annular placement groove (30).

5. A wellhead oil and gas co-production device according to claim 4, characterized in that: An annular storage groove (29) is provided inside the annular placement groove (30) on the side near the connecting ring (17). Multiple round holes (28) are provided inside the annular storage groove (29) on the side away from the annular placement groove (30). A spring hole (24) is provided at the end of the round hole (28) away from the annular storage groove (29). The rubber sealing ring (9) is located inside the annular placement groove (30). A pressure groove (19) is provided at the end of the rubber sealing ring (9) near the round hole (28).

6. A wellhead oil and gas co-production device according to claim 5, characterized in that: The pressure ring (20) is located inside the annular storage groove (29). The outer side wall of the moving rod (21) and the inner side wall of the circular hole (28) are slidably connected. The end of the moving rod (21) away from the spring hole (24) is fixedly connected to the side of the pressure ring (20) away from the rubber sealing ring (9). The end of the moving rod (21) away from the pressure ring (20) is fixedly connected to the connecting ring (17). The outer side walls of the two fixed rings (10) are fixedly connected to the inner side wall of the rear cover (3) and the inner side wall of the fixed cylinder (2), respectively.

7. A wellhead oil and gas co-production device according to claim 6, characterized in that: The spring (22) is sleeved on the outside of the moving rod (21). The spring (22) is located inside the spring hole (24). The two ends of the spring (22) are fixedly connected to the spring hole (24) and the connecting ring (17) respectively. The outer walls of the two sealing rings (18) are fixedly connected to the inner wall of the rear cover (3) and the inner side of the fixing cylinder (2) respectively. The outer walls of the two fixing rings (10) are fixedly connected to the inner wall of the rear cover (3) and the inner side of the fixing cylinder (2) respectively.

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