Multi-well oil-gas-liquid three-phase metering switching device

Abstract

A multi-well oil-gas-liquid three-phase metering switching device relates to the technical field of oil-gas metering. A row of liquid inlet pipes is welded on the wall of a conversion pipe, two liquid outlet pipes are welded on the positions on the two sides of the liquid inlet pipes, a piston is arranged in the conversion pipe, the left side of the piston is connected with a jack rod, the jack rod is fixedly connected with a rigid plate, an electric push rod is connected with the upper part of the conversion pipe through a hinge, and the screw rod of the electric push rod is connected with the rigid plate through a hinge. The beneficial effects of the device are as follows: multiple single-well liquid inlet pipes and liquid outlet pipes are arranged on the conversion pipe through design, the piston is moved by the electric push rod, when the piston moves to the position of a liquid inlet pipe, the gas and liquid of the single well flow into the metering pipe for metering, the gas and liquid of the single well on the two sides of the piston are discharged to the external pipeline through the liquid outlet pipes, and the pressure is not blocked when the piston is switched to other liquid inlet pipes, which is beneficial to safe operation, can prevent fine sand in the liquid from damaging the seal, and has the characteristics of simple structure, stable and reliable operation, low cost and high safety performance.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas metering technology, and in particular to a multi-well oil, gas and liquid three-phase metering switching device. Background Technology

[0002] Multi-well oil and gas wells currently use multi-well metering skids for metering. At regular intervals, the production of a single well is metered (fluid production, oil production, and gas production). After metering of one well is completed, the system switches to the next well. The metering switching device currently uses a rotary multi-way valve (e.g., Figure 1 (As shown) The multi-way valve includes an inlet valve body d, an outlet valve body e, and a switching valve body f. The inlet valve body d has multiple inlet ports a around its circumference. One of the inlet ports a is connected to the inner hole of the switching valve body f. The outlet port b of the switching valve body f is connected to the metering instrument. The liquid from the other wells flows out from the outlet manifold port c. Rotating the switching valve body f allows switching between individual wells. The switching valve body f and the inlet valve body d are connected by a planar hard seal g. The switching valve body f and the outlet valve body e are connected by a mechanical seal h. Because the pressure difference between the wells is very large, sometimes reaching several MPa, the sealing between the metering pipeline and other individual wells is particularly important for the metering results. The above multi-way valve structure uses a simple planar hard seal g, which is difficult to withstand large pressures. The contact surfaces of the inlet valve body d and the switching valve body f need to be honed, which has extremely high processing requirements and high costs.

[0003] The produced fluid from a single well contains fine sand. When switching the valve body f, the sand gets stuck between the planar hard seals g, which can easily cause equipment failure, affect the safety performance of on-site measurement, and damage the planar seal. Utility Model Content

[0004] To address the problems of poor pressure resistance and frequent malfunctions in existing multi-well metering switching devices, this invention provides a multi-well oil-gas-liquid three-phase metering switching device.

[0005] The technical solution provided by this utility model is: a multi-well oil-gas-liquid three-phase metering switching device, including a switching pipe, a row of liquid inlet pipes welded on the pipe wall of the switching pipe, the number of liquid inlet pipes being more than two, two liquid outlet pipes welded on both sides of the switching pipe, a piston provided inside the switching pipe, a push rod connected to the left side of the piston by a thread, the push rod extending to the left of the switching pipe and then fixedly connected to a rigid plate by bolts, an electric push rod connected to the upper part of the switching pipe by a hinge, the lead screw of the electric push rod connected to the rigid plate by a hinge, and the lead screw and the push rod being arranged in parallel;

[0006] The piston and the conversion tube are connected with a clearance fit. There is an annular groove in the middle of the outer circle of the piston. There is a countersunk hole on the right end of the piston facing left. Several side holes are opened between the countersunk hole and the annular groove. The right side of the piston is connected to the metering core tube by threads and O-ring seals. The right side of the conversion tube is connected to the sleeve seat by threads and O-ring seals. The metering core tube and the sleeve seat are connected with a clearance fit. The right side of the sleeve seat is equipped with a metering tube, which communicates with the inner hole of the sleeve seat. The inlet pipe and outlet pipe communicate with the inner hole of the conversion tube.

[0007] Two elastic rings and one lip-shaped skeleton seal are provided on both sides of the piston's ring groove. The elastic rings are arranged on the side closer to the ring groove. Two elastic rings and one lip-shaped skeleton seal are provided between the metering core tube and the sleeve seat. The elastic rings are located inside the lip-shaped skeleton seal. Two elastic rings and one lip-shaped skeleton seal are provided between the push rod and the conversion tube. The elastic rings are located inside the lip-shaped skeleton seal.

[0008] The distance between the piston's ring groove and the piston's left end face is less than the inner hole of the inlet pipe, and the distance between the piston's ring groove and the piston's right end face is less than the inner hole of the inlet pipe. The inlet pipe is connected to the conversion pipe by a square-round connecting pipe. The part where the square-round connecting pipe connects to the conversion pipe is a rectangular connecting pipe. The part where the square-round connecting pipe connects to the inlet pipe is a round connecting pipe. The inner wall width of the rectangular tube of the square-round connecting pipe is equal to the inner hole size of the inlet pipe.

[0009] The dimensions of the switching tube, push rod, metering core tube, and sleeve seat are such that the piston can be accommodated in the switching tube on the right side of the right drain tube.

[0010] The electric actuator has a built-in potentiometer with full signal feedback. A radar level gauge is installed on the right side of the rigid plate. There is a reflective ring on the left side of the conversion tube. The probe of the radar level gauge is installed facing the reflective ring. The width of the ring groove is 10mm wider than the inner hole of the inlet pipe.

[0011] The elastic ring is cut with a slant, which is cut obliquely from the outer circle of the elastic ring inward. The diameter of the elastic ring is 0.8 to 1.2 mm larger than the inner diameter of the conversion tube. The elastic ring is made of nylon material.

[0012] The number of bolts connecting the rigid plate and the top rod is two.

[0013] The beneficial effects of this utility model are as follows: This utility model changes the traditional rotary switching method and adopts a piston linear motion method to switch single-well metering, which greatly reduces the processing difficulty and accuracy, while improving the sealing performance. By designing multiple single-well inlet pipes and outlet pipes to be arranged on a switching pipe, the piston is moved by an electric push rod. When the piston moves to a certain inlet pipe position, the gas and liquid of that single well flows into the metering pipe for metering. The gas and liquid of the single wells on both sides of the piston are discharged to the external transmission pipeline through the outlet pipe. By changing the position of the piston, the metering can be switched to the inlet pipe of the next single well. There is no pressure backing phenomenon when the piston switches to other inlet pipes, which is conducive to safe operation. At the same time, it can prevent fine sand in the liquid from damaging the seal. It has the characteristics of simple structure, stable and reliable operation, low cost and high safety performance. Attached Figure Description

[0014] Appendix Figure 1 This is a schematic diagram of an existing rotary multi-way valve;

[0015] Appendix Figure 2 This is a schematic diagram of the structure of this utility model;

[0016] Appendix Figure 3 It is attached Figure 2 Enlarged view of point A;

[0017] Appendix Figure 4 It is attached Figure 2 Enlarged view of point B;

[0018] Appendix Figure 5 This is a schematic diagram of the piston structure in this utility model;

[0019] Appendix Figure 6 This is a working drawing of this utility model;

[0020] Appendix Figure 7 It is attached Figure 2 CC cross-section;

[0021] Appendix Figure 8 This is a partial schematic diagram showing the piston at a relevant position in the inlet pipe;

[0022] Appendix Figure 9 This is a schematic diagram showing the connection between the switching pipe and the inlet pipe;

[0023] Appendix Figure 10 This is a schematic diagram of the elastic ring in this utility model.

[0024] In the diagram, a-inlet, b-outlet, c-outlet manifold, d-inlet valve body, e-drain valve body, f-converter valve body, g-flat hard seal, h-mechanical seal, 1-converter pipe, 2-inlet pipe, 201-square and round connecting pipe, 3-drain pipe, 4-piston, 401-ring groove, 402-side hole, 403-countersunk hole, 5-push rod, 6-rigid plate, 7-electric push rod, 701-screw rod, 8-metering core tube, 9-sleeve seat, 10-elastic ring, 1001-slanted slit, 11-lip-shaped skeleton seal ring, 12-O-ring seal ring, 13-radar level gauge, 14-metering tube, 15-reflective ring surface. Detailed Implementation

[0025] like Figures 1-10 As shown, a multi-well oil-gas-liquid three-phase metering switching device includes a switching pipe 1, a row of inlet pipes 2 welded on the pipe wall of the switching pipe 1, the number of inlet pipes 2 being more than two, the inlet pipes 2 connecting to the wellheads of each single well, two outlet pipes 3 welded on both sides of the inlet pipes 2 of the switching pipe 1, the outlet pipes 3 connecting to the external transmission pipeline, a piston 4 provided inside the switching pipe 1, a push rod 5 connected to the left side of the piston 4 by a thread, the push rod 5 extending to the left of the switching pipe 1 and then fixedly connected to the rigid plate 6 by bolts, an electric push rod 7 connected to the upper part of the switching pipe 1 by a hinge, the lead screw 701 of the electric push rod 7 connected to the rigid plate 6 by a hinge, the lead screw 701 and the push rod 5 being arranged in parallel;

[0026] Piston 4 is connected to conversion tube 1 with clearance fit. Piston 4 has an annular groove 401 in the middle of its outer circle. Piston 4 has a countersunk hole 403 on its right end face to the left. Several side holes 402 are opened between the countersunk hole 403 and the annular groove 401. Piston 4 is connected to metering core tube 8 by thread and O-ring seal 12 on its right side. Conversion tube 1 is connected to sleeve seat 9 by thread and O-ring seal 12 on its right side. Metering core tube 8 and sleeve seat 9 are connected with clearance fit. A metering tube 14 is provided on the right side of sleeve seat 9. Metering tube 14 is connected to the inner hole of sleeve seat 9. Inlet pipe 2 and outlet pipe 3 are connected to the inner hole of conversion tube 1.

[0027] Two elastic rings 10 and one lip-shaped skeleton seal ring 11 are respectively provided on both sides of the annular groove 401 of the piston 4. The elastic rings 10 are arranged on the side closer to the annular groove 401. Two elastic rings 10 and one lip-shaped skeleton seal ring 11 are provided between the metering core tube 8 and the sleeve seat 9. The elastic rings 10 are located inside the lip-shaped skeleton seal ring 11. Two elastic rings 10 and one lip-shaped skeleton seal ring 11 are provided between the push rod 5 and the conversion tube 1. The elastic rings 10 are located inside the lip-shaped skeleton seal ring 11.

[0028] The lip-shaped skeleton seal ring 11 serves as a movable seal, while the elastic ring 10 blocks fine sand in the liquid from the outside of the lip-shaped skeleton seal ring 11, maintaining the integrity of the lip-shaped skeleton seal ring 11 and ensuring that the sealing performance is not compromised during operation.

[0029] By designing multiple single-well inlet pipes 2 and outlet pipes 3 to be arranged on a switching pipe 1, the piston 4 is moved by the electric push rod 7. When the piston 4 moves to a certain inlet pipe 2, the annular groove 401 of the piston 4 covers the inner hole of the inlet pipe 2. The gas and liquid of the single well then flow into the metering pipe 14 through the metering core pipe 8 and the casing seat 9 for metering. The gas and liquid of the single well on both sides of the piston 4 are discharged to the external transmission pipeline through the outlet pipe 3. By changing the position of the piston 4, the metering can be switched to the inlet pipe 2 of the next single well.

[0030] The distance between the annular groove 401 of piston 4 and the left end face of piston 4 is less than the inner hole of inlet pipe 2. The distance between the annular groove 401 of piston 4 and the right end face of piston 4 is less than the inner hole of inlet pipe 2. Inlet pipe 2 is connected to conversion pipe 1 by a square-round pipe 201. The part of square-round pipe 201 that connects to conversion pipe 1 is a rectangular pipe connector. The part of square-round pipe 201 that connects to inlet pipe 2 is a round pipe connector. The inner wall width of the rectangular pipe of square-round pipe 201 is equal to the inner hole size of inlet pipe 2.

[0031] The above structural design is based on the following considerations: When the original multi-way valve switches to the next valve position after the single-well metering is completed, the rotation of the switching valve body f will cause the inlet a to be temporarily blocked, resulting in a wellhead pressure buildup, which is not conducive to safe operation. In this technical solution, when the piston 4 leaves a certain inlet pipe 2, the inlet fluid will switch from the annular groove 401 to flow between the annular groove 401 and the switching pipe 1. The structure of the square and round connecting pipe 201 increases the cross-sectional area of ​​the fluid flowing into the switching pipe 1 at this time, and will not cause pressure buildup, which is conducive to safe and continuous operation.

[0032] like Figures 8-9 As shown, the dimensions of the switching pipe 1, top rod 5, metering core tube 8 and casing seat 9 are such that the piston 4 can be accommodated in the switching pipe 1 on the right side of the right drainage pipe 3. At this time, all single wells' fluid intake flows into the drainage pipe 3 through the switching pipe 1, that is, all single wells are in a non-metering state.

[0033] The electric push rod 7 has a built-in potentiometer with full-range signal feedback. A radar level gauge 13 is installed on the right side of the rigid plate 6. There is a reflective ring surface 15 on the left side of the conversion tube 1. The probe of the radar level gauge 13 is installed facing the reflective ring surface 15. The signal collected by the radar level gauge 13 is compared with the signal of the potentiometer, so that the position of the piston 4 is more accurate. The width of the ring groove 401 is 10mm larger than the inner hole of the liquid inlet pipe 2, which can ensure that the ring groove 401 of the piston 4 can cover the inner hole of the liquid inlet pipe 2, reducing the machining accuracy and control accuracy, and reducing costs.

[0034] like Figure 10As shown, the elastic ring 10 is cut with a slit 1001. The slit 1001 is cut obliquely inward from the outer circle of the elastic ring 10. The diameter of the elastic ring 10 is 0.8 to 1.2 mm larger than the inner diameter of the conversion tube 1. The elastic ring 10 is made of nylon material. The slit 1001 allows for the shrinkage of the elastic ring 10 during installation and can also block fine sand in the axial direction.

[0035] Two bolts connect the rigid plate 6 and the push rod 5 to ensure that the push rod 5 will not rotate and to prevent the push rod 5 from rotating and disengaging from the piston 4 during operation.

[0036] By designing multiple single-well inlet pipes 2 and outlet pipes 3 arranged on a switching pipe 1, and using an electric push rod 7 to push the piston 4 to move, when the piston 4 moves to a certain inlet pipe 2 position, the gas and liquid of that single well flows into the metering pipe 14 for metering. The gas and liquid of the single well on both sides of the piston 4 are discharged to the external transmission pipeline through the outlet pipe 3. By changing the position of the piston 4, it can be switched to the inlet pipe 2 of the next single well for metering. When the piston 4 is switched to other inlet pipes 2, there will be no pressure backing phenomenon, which is conducive to safe operation. At the same time, it can prevent fine sand in the liquid from damaging the seal. It has the characteristics of simple structure, stable and reliable operation, low cost and high safety performance.

Claims

1. A multi-well oil-gas-liquid three-phase metering switching device, comprising a switching pipe (1), characterized in that: A row of inlet pipes (2) is welded on the wall of the conversion pipe (1). The number of inlet pipes (2) is greater than two. Two outlet pipes (3) are welded on both sides of the inlet pipes (2). A piston (4) is provided inside the conversion pipe (1). The piston (4) is connected to a push rod (5) by a thread on the left side. The push rod (5) extends to the left of the conversion pipe (1) and is fixedly connected to the rigid plate (6) by bolts. An electric push rod (7) is connected to the upper part of the conversion pipe (1) by a hinge. The lead screw (701) of the electric push rod (7) is connected to the rigid plate (6) by a hinge. The lead screw (701) and the push rod (5) are arranged in parallel. The piston (4) is connected to the conversion tube (1) with clearance fit. A ring groove (401) is opened in the middle of the outer circle of the piston (4). A countersunk hole (403) is opened to the left on the right end of the piston (4). Several side holes (402) are opened between the countersunk hole (403) and the ring groove (401). The right side of the piston (4) is connected to the metering core tube (8) by thread and O-ring seal (12). The right side of the conversion tube (1) is connected to the sleeve seat (9) by thread and O-ring seal (12). The metering core tube (8) is connected to the sleeve seat (9) with clearance fit. A metering tube (14) is provided on the right side of the sleeve seat (9). The metering tube (14) is connected to the inner hole of the sleeve seat (9). The liquid inlet pipe (2) and the liquid outlet pipe (3) are connected to the inner hole of the conversion tube (1). Two elastic rings (10) and one lip-shaped skeleton seal ring (11) are respectively provided on both sides of the annular groove (401) of the piston (4). The elastic rings (10) are arranged on the side close to the annular groove (401). Two elastic rings (10) and one lip-shaped skeleton seal ring (11) are provided between the metering core tube (8) and the sleeve seat (9). The elastic rings (10) are located inside the lip-shaped skeleton seal ring (11). Two elastic rings (10) and one lip-shaped skeleton seal ring (11) are provided between the push rod (5) and the conversion tube (1). The elastic rings (10) are located inside the lip-shaped skeleton seal ring (11).

2. The multi-well oil-gas-liquid three-phase metering switching device according to claim 1, characterized in that: The distance between the annular groove (401) of the piston (4) and the left end face of the piston (4) is less than the inner hole of the inlet pipe (2). The distance between the annular groove (401) of the piston (4) and the right end face of the piston (4) is less than the inner hole of the inlet pipe (2). The inlet pipe (2) is connected to the conversion pipe (1) by a square-round pipe (201). The part of the square-round pipe (201) that connects to the conversion pipe (1) is a rectangular pipe connector. The part of the square-round pipe (201) that connects to the inlet pipe (2) is a round pipe connector. The inner wall width of the rectangular pipe of the square-round pipe (201) is equal to the inner hole size of the inlet pipe (2).

3. The multi-well oil-gas-liquid three-phase metering switching device according to claim 1, characterized in that: The dimensions of the switching tube (1), push rod (5), metering core tube (8) and sleeve seat (9) are such that the piston (4) can be accommodated in the switching tube (1) on the right side of the right drain tube (3).

4. The multi-well oil-gas-liquid three-phase metering switching device according to claim 1, characterized in that: The electric push rod (7) has a potentiometer with full signal feedback. A radar level gauge (13) is installed on the right side of the rigid plate (6). There is a reflective ring (15) on the left side of the conversion tube (1). The probe of the radar level gauge (13) is installed facing the reflective ring (15). The width of the ring groove (401) is 10mm greater than the inner hole of the liquid inlet pipe (2).

5. A multi-well oil-gas-liquid three-phase metering switching device according to claim 1, characterized in that: The elastic ring (10) is cut with a slanted slit (1001). The slanted slit (1001) is cut obliquely inward from the outer circle of the elastic ring (10). The diameter of the elastic ring (10) is 0.8 to 1.2 mm larger than the inner diameter of the conversion tube (1). The elastic ring (10) is made of nylon material.

6. The multi-well oil-gas-liquid three-phase metering switching device according to claim 1, characterized in that: The number of bolts connecting the rigid plate (6) and the top rod (5) is two.

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