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

Abstract

The invention discloses a multi-well oil-gas-liquid three-phase metering switching device, and relates to the technical field of oil-gas metering. A row of liquid inlet pipes are welded to the pipe wall of the conversion pipe, two liquid outlet pipes are welded to the two sides of each liquid inlet pipe, a piston is arranged in the conversion pipe, the left side of the piston is connected with an ejector rod, the ejector rod is fixedly connected with a rigid plate, the upper portion of the conversion pipe is connected with an electric push rod through a hinge, and a lead screw of the electric push rod is connected with the rigid plate through a hinge. The gas-liquid metering device has the beneficial effects that the liquid inlet pipes and the liquid discharge pipes of the single wells are arranged on the conversion pipe, the piston is pushed to move through the electric push rod, when the piston moves to a certain liquid inlet pipe, gas and liquid of the single wells flow into the metering pipe to be metered, and the gas and liquid of the single wells on the two sides of the piston are discharged to an external conveying pipeline through the liquid discharge pipes; when the piston is switched to other liquid inlet pipes, the pressure building phenomenon cannot be generated, safe operation is facilitated, meanwhile, fine sand in liquid can be prevented from damaging sealing, and the liquid inlet pipe has the advantages of being simple in structure, stable and reliable in operation, low in cost and high in safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas metering, and in particular to a multi-well oil, gas and liquid three-phase metering switching device. Background Art

[0002] Multi-well oil and gas wells currently use multi-well metering skids for metering. The liquid production, oil production and gas production of a single well are measured at regular intervals. After the measurement of the single well is completed, the metering is switched to the next single well. The metering switching device currently uses a rotary multi-way valve (such as Figure 1 (As shown) the multi-way valve includes an inlet valve body d, a discharge valve body e and a conversion valve body f. The inlet valve body d is circumferentially opened with multiple liquid inlets a, one of which is connected to the inner hole of the conversion valve body f. The liquid outlet b of the conversion valve body f is connected to a metering instrument, and the liquids from other wellheads flow out from the liquid outlet manifold c. Rotating the conversion valve body f can realize switching between individual wells. The conversion valve body f and the inlet valve d are connected by a flat hard seal g, and the conversion valve body f and the outlet valve body e are connected by a mechanical seal h. Since the pressure difference between the wells is large, sometimes reaching several MPa, the seal between the metering pipeline and other individual wells is particularly important to the metering results. The above-mentioned multi-way valve structure adopts a simple flat hard seal g, which is difficult to withstand high pressure. The contact surface of the inlet valve body d and the conversion valve body f needs to be honed, which has extremely high processing requirements and high cost.

[0003] The produced fluid from a single well contains fine sand. When the conversion valve body f is switched, the sand is stuck between the flat hard seals g, which can easily cause equipment failure, affect the safety performance of on-site measurement, and destroy the flat seal. Summary of the Invention

[0004] In order to solve the problems of poor pressure bearing capacity and frequent failures in existing multi-well metering switching devices, the present invention provides a multi-well oil, gas and liquid three-phase metering switching device.

[0005] The technical solution provided by the present invention is: a multi-well oil, gas and liquid three-phase metering switching device, including a conversion tube, a row of liquid inlet pipes welded to the tube wall of the conversion tube, the number of liquid inlet pipes being greater than two, two liquid discharge pipes welded to the conversion tube at both sides of the liquid inlet pipe, a piston is provided in the conversion tube, the left side of the piston is connected to a push rod via a thread, the push rod extends to the left of the conversion tube and is fixedly connected to a rigid plate via bolts, the upper part of the conversion tube is connected to an electric push rod via a hinge, the lead screw of the electric push rod is connected to the rigid plate via a hinge, and the lead screw and the push rod are arranged in parallel;

[0006] The piston is connected with the conversion tube with a clearance fit, an annular groove is opened in the middle of the outer circle of the piston, a countersunk hole is opened on the left side of the right end surface of the piston, and a plurality of 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 through a thread and an O-ring, and the right side of the conversion tube is connected to the sleeve seat through a thread and an O-ring. The metering core tube is connected with the sleeve seat with a clearance fit, and a metering tube is provided on the right side of the sleeve seat. The metering tube is connected to the inner hole of the sleeve seat, and the liquid inlet pipe and the liquid discharge pipe are connected to the inner hole of the conversion tube;

[0007] Two elastic rings and a lip-shaped skeleton sealing ring are respectively provided on both sides of the ring groove of the piston. The elastic ring is arranged close to one side of the ring groove. Two elastic rings and a lip-shaped skeleton sealing ring are provided between the metering core tube and the sleeve seat. The elastic ring is arranged on the inner side of the lip-shaped skeleton sealing ring. Two elastic rings and a lip-shaped skeleton sealing ring are provided between the push rod and the conversion tube. The elastic ring is arranged on the inner side of the lip-shaped skeleton sealing ring.

[0008] The distance between the piston's annular groove and the left end face of the piston is smaller than the inner hole of the liquid inlet pipe, and the distance between the piston's annular groove and the right end face of the piston is smaller than the inner hole of the liquid inlet pipe. The liquid inlet pipe transitions from a square-round pipe to a square-round pipe at the connection to the conversion pipe. The part where the square-round pipe connects to the conversion pipe is a rectangular pipe, and the part where the square-round pipe connects to the liquid inlet pipe is a round pipe. The inner wall width of the rectangular tube of the square-round pipe is equal to the inner hole size of the liquid inlet pipe.

[0009] The dimensions of the conversion tube, the ejector rod, the metering core tube and the sleeve seat are such that the piston can be accommodated in the conversion tube to the right of the right discharge tube.

[0010] The electric push rod has a potentiometer with full-range signal feedback. A radar level meter is installed on the right side of the rigid plate. There is a reflecting ring surface on the left side of the conversion tube. The probe of the radar level meter is installed facing the reflecting ring surface. The width of the ring groove is 10mm larger than the inner hole of the liquid inlet pipe.

[0011] The elastic ring is cut with an oblique seam which is cut obliquely inward from the outer circle of the elastic ring. The diameter of the elastic ring is 0.8 to 1.2 mm larger than the inner hole 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 the present invention are as follows: the present invention changes the traditional rotary switching method and adopts the piston linear motion method to switch the single well metering, which greatly reduces the processing difficulty and precision, and improves the sealing performance. Through design, multiple single well liquid inlet pipes and liquid discharge pipes are arranged on a conversion tube, and the piston is pushed to move by an electric push rod. When the piston moves to a certain liquid inlet pipe position, the gas and liquid of the single well flow into the metering pipe for metering, and the single well gas and liquid on both sides of the piston are discharged to the external transmission pipeline through the liquid discharge pipe. By changing the position of the piston, the liquid inlet pipe of the next single well can be switched for metering. When the piston switches to other liquid inlet pipes, no pressure holding phenomenon will occur, which is conducive to safe operation. At the same time, it can prevent fine sand in the liquid from destroying the seal. It has the characteristics of simple structure, stable and reliable operation, low cost and high safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attachment Figure 1 It is a structural diagram of an existing rotary multi-way valve;

[0015] Attachment Figure 2 It is a structural schematic diagram of the present invention;

[0016] Attachment Figure 3 It is attached Figure 2 A magnified view of point A;

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

[0018] Attachment Figure 5 It is a structural schematic diagram of the piston in the present invention;

[0019] Attachment Figure 6 It is a working diagram of the present invention;

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

[0021] Attachment Figure 8 It is a partial schematic diagram of the piston located in the relevant position of the liquid inlet pipe;

[0022] Attachment Figure 9 This is a schematic diagram of the connection between the conversion tube and the liquid inlet pipe;

[0023] Attachment Figure 10 It is a structural schematic diagram of the elastic ring in the present invention.

[0024] In the figure, a-liquid inlet, b-liquid outlet, c-liquid outlet manifold, d-liquid inlet valve body, e-liquid discharge valve body, f-conversion valve body, g-flat hard seal, h-mechanical seal, 1-conversion tube, 2-liquid inlet pipe, 201-square and round pipe, 3-liquid discharge pipe, 4-piston, 401-ring groove, 402 side hole, 403-sink hole, 5-top rod, 6-rigid plate, 7-electric push rod, 701-screw rod, 8-metering core tube, 9-sleeve seat, 10-elastic ring, 1001-oblique slit, 11-lip skeleton seal ring, 12-O-ring, 13-radar level meter, 14-metering tube, 15-reflection annulus. DETAILED DESCRIPTION

[0025] like Figures 1 to 10 As shown, a multi-well oil, gas and liquid three-phase metering switching device includes a conversion tube 1. A row of liquid inlet pipes 2 are welded to the tube wall of the conversion tube 1. The number of liquid inlet pipes 2 is greater than two. The liquid inlet pipes 2 are connected to the wellheads of each single well. Two liquid discharge pipes 3 are welded to the conversion tube 1 on both sides of the liquid inlet pipe 2. The liquid discharge pipes 3 are connected to the external transmission pipeline. A piston 4 is provided in the conversion tube 1. The left side of the piston 4 is connected to a push rod 5 through a thread. The push rod 5 extends to the left of the conversion tube 1 and is fixedly connected to a rigid plate 6 by bolts. The upper part of the conversion tube 1 is connected to an electric push rod 7 through a hinge. The screw rod 701 of the electric push rod 7 is connected to the rigid plate 6 through a hinge. The screw rod 701 and the push rod 5 are arranged in parallel.

[0026] The piston 4 is connected to the conversion tube 1 with a clearance fit, an annular groove 401 is opened in the middle of the outer circle of the piston 4, a countersunk hole 403 is opened on the left side of the right end surface of the piston 4, and a plurality of side holes 402 are opened between the countersunk hole 403 and the annular groove 401. The right side of the piston 4 is connected to the metering core tube 8 by a thread and an O-ring 12, and the right side of the conversion tube 1 is connected to the sleeve seat 9 by a thread and an O-ring 12. The metering core tube 8 is connected to the sleeve seat 9 with a clearance fit, and 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, and the liquid inlet pipe 2 and the liquid discharge pipe 3 are connected to the inner hole of the conversion tube 1;

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

[0028] The lip-shaped skeleton sealing ring 11 plays the role of mobile sealing, and the elastic ring 10 blocks the fine sand in the liquid outside the lip-shaped skeleton sealing ring 11, maintaining the integrity of the lip-shaped skeleton sealing ring 11 and not damaging the sealing performance during operation.

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

[0030] The distance between the annular groove 401 of the piston 4 and the left end face of the piston 4 is smaller than the inner hole of the liquid inlet pipe 2, and the distance between the annular groove 401 of the piston 4 and the right end face of the piston 4 is smaller than the inner hole of the liquid inlet pipe 2. The liquid inlet pipe 2 is transitioned by a square-round connecting pipe 201 at the connection part of the conversion pipe 1. The part where the square-round connecting pipe 201 connects to the conversion pipe 1 is a rectangular tube connecting pipe, and the part where the square-round connecting pipe 201 connects to the liquid inlet pipe 2 is a circular tube connecting pipe. The inner wall width of the rectangular tube of the square-round connecting pipe 201 is equal to the inner hole size of the liquid 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 conversion valve body f rotates, which will cause the liquid inlet a to be temporarily blocked, resulting in a state of pressure buildup at the wellhead, which is not conducive to safe operation. In this technical solution, when the piston 4 leaves a certain liquid inlet pipe 2, the liquid will be transferred from the annular groove 401 to flow between the annular groove 401 and the conversion pipe 1. The structure of the square-circular connecting pipe 201 increases the cross-sectional area of ​​the liquid flowing into the conversion 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 conversion tube 1, the push rod 5, the metering core tube 8 and the sleeve seat 9 are such that the piston 4 can be accommodated in the conversion tube 1 on the right side of the right drainage tube 3. At this time, all the liquid inflow from the single wells flows into the drainage tube 3 through the conversion tube 1, that is, all the single wells are in an unmetered state.

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

[0034] like Figure 10As shown, the elastic ring 10 is cut with an oblique slit 1001, which 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 hole diameter of the conversion tube 1. The elastic ring 10 is made of nylon material. The oblique slit 1001 allows the elastic ring 10 to shrink during installation and can also block fine sand in the axial direction.

[0035] There are two bolts connecting the rigid plate 6 and the push rod 5 to ensure that the push rod 5 does not rotate and to prevent the push rod 5 from rotating and disengaging from the piston 4 during operation.

[0036] Through design, multiple single-well liquid inlet pipes 2 and liquid discharge pipes 3 are arranged on a conversion tube 1, and the piston 4 is pushed to move by the electric push rod 7. When the piston 4 moves to a certain liquid inlet pipe 2, the gas and liquid of the single well flow into the metering pipe 14 for metering, and the gas and liquid of the single well on both sides of the piston 4 are discharged to the external transmission pipeline through the liquid discharge pipe 3. By changing the position of the piston 4, the liquid inlet pipe 2 of the next single well can be switched to for metering. When the piston 4 switches to other liquid inlet pipes 2, no pressure build-up will occur, which is conducive to safe operation. At the same time, it can prevent fine sand in the liquid from destroying 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 and liquid three-phase metering switching device, comprising a conversion tube 1, characterized in that: A row of liquid inlet pipes (2) is welded on the wall of the conversion tube (1), the number of the liquid inlet pipes (2) is greater than two, and two liquid discharge pipes (3) are welded on both sides of the liquid inlet pipe (2) of the conversion tube (1). A piston (4) is provided in the conversion tube (1), and the left side of the piston (4) is connected to a push rod (5) through a thread, and the push rod (5) extends to the left of the conversion tube (1) and is fixedly connected to a rigid plate (6) through a bolt, and the upper part of the conversion tube (1) is connected to an electric push rod (7) through a hinge, and a screw rod (701) of the electric push rod (7) is connected to the rigid plate (6) through a hinge, and the screw rod (701) and the push rod (5) are arranged in parallel; The piston (4) is connected to the conversion tube (1) with clearance fit, an annular groove (401) is provided in the middle of the outer circle of the piston (4), a countersunk hole (403) is provided on the right end surface of the piston (4) to the left, and a plurality of side holes (402) are provided between the countersunk hole (403) and the annular groove (401), the right side of the piston (4) is connected to the metering core tube (8) through a thread and an O-type sealing ring (12), the right side of the conversion tube (1) is connected to the sleeve seat (9) through a thread and an O-type sealing ring (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 communicated with the inner hole of the sleeve seat (9), and the liquid inlet pipe (2) and the liquid discharge pipe (3) are communicated with the inner hole of the conversion tube (1); Two elastic rings (10) and a lip-shaped skeleton sealing ring (11) are respectively provided on both sides of the ring groove (401) of the piston (4), and the elastic ring (10) is arranged close to one side of the ring groove (401). Two elastic rings (10) and a lip-shaped skeleton sealing ring (11) are provided between the metering core tube (8) and the sleeve seat (9), and the elastic ring (10) is arranged on the inner side of the lip-shaped skeleton sealing ring (11). Two elastic rings (10) and a lip-shaped skeleton sealing ring (11) are provided between the push rod (5) and the conversion tube (1), and the elastic ring (10) is arranged on the inner side of the lip-shaped skeleton sealing ring (11).

2. The multi-well oil, gas and liquid three-phase metering switching device according to claim 1 is characterized in that: The distance between the annular groove (401) of the piston (4) and the left end surface of the piston (4) is smaller than the inner hole of the liquid inlet pipe (2); the distance between the annular groove (401) of the piston (4) and the right end surface of the piston (4) is smaller than the inner hole of the liquid inlet pipe (2); the liquid inlet pipe (2) is transitioned by a square-round connecting pipe (201) at the portion where it is connected to the conversion pipe (1); the portion where the square-round connecting pipe (201) is connected to the conversion pipe (1) is a rectangular connecting pipe; the portion where the square-round connecting pipe (201) is connected to the liquid inlet pipe (2) is a round connecting pipe; the inner wall width of the rectangular tube of the square-round connecting pipe (201) is equal to the inner hole size of the liquid inlet pipe (2).

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

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

5. The multi-well oil, gas and liquid three-phase metering switching device according to claim 1 is characterized in that: The elastic ring (10) is cut with an oblique slit (1001), which 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 hole diameter of the conversion tube (1). The elastic ring (10) is made of nylon material.

6. The multi-well oil, gas and 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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