Pump-down circulating oil pipe hydraulic control environmental protection blowout prevention device

Abstract

A pump-under-circulation oil pipe hydraulic control environmental protection blowout prevention device, characterized in that it includes an upper joint and a pressure pipe installed on the upper part of the oil pump, and a circulation working valve installed on the lower part of the oil pump for repeatedly opening and closing the upper and lower channels, and a circulation pulling system for pulling the ball of the circulation working valve, the top of the circulation working valve is connected to the bottom of the oil pump; the bottom of the circulation working valve is connected to the top of the circulation pulling system through a coupling pipe; the two ends of the pressure pipe are connected between one side of the top of the circulation pulling system and one side of the lower end of the upper joint. The advantages of the present invention are: in the process of lifting and lowering the pipe string, the channels are closed, and the well fluid will not gush from the inside of the pipe string to the ground, thereby avoiding the pollution caused by this; and in the normal working state, the channels are open to ensure normal production.

Description

Technical Field

[0001] The invention relates to a pump-down circulating oil pipe hydraulic control environmental protection blowout prevention device, which is a device used in the process of lifting and lowering the pipe string in oil field production operations to prevent well fluid from spraying out of the pipe string, and belongs to the field of oil field application technology. Background Art

[0002] At present, before normal production operations of pumping wells, the tubing string composed of oil pipes needs to be lowered to the bottom of the well. The oil pump and other downhole tools are installed under the tubing string. The inner hole of the tubing string is the channel for the rod string to reciprocate up and down, and it is also the channel for the well fluid to be discharged. It needs to be unobstructed during the operation. During well repair operations, the rod string needs to be lifted out of the tubing string, and then the tubing string needs to be lifted out of the well before the oil pump can be lifted out of the ground for maintenance. Therefore, the tubing string needs to be lifted and lowered when operations are required and before normal production.

[0003] The formation pressure downhole varies. For some low-pressure wells, the liquid level in the well is far below the wellhead. During the process of lifting the tubing, the crude oil in the tubing needs to be released underground to prevent it from being brought to the ground and causing pollution. For some high-pressure wells, the pressure in the well continuously lifts the well fluid and sprays out of the wellhead. Therefore, during the process of lifting and lowering the tubing, the well fluid in the well will continuously spray out of the ground from the inside of the tubing, which will not only cause ground pollution, but also pose a safety hazard. In this case, it is necessary to close the inner hole of the tubing when lowering the tubing into the well, and it needs to be fully opened during the working process to ensure smooth flow, and then it needs to be sealed again before lifting the tubing for well repair operations. A device that has these three functions at the same time can complete this task.

[0004] The existing technology cannot complete the entire operation process well. Many devices can only complete a single downhole sealing action. The inner hole of the pipe string cannot be sealed when the pipe string is lifted up, which often causes well fluid to spray out of the ground, causing serious pollution and safety hazards. Summary of the invention

[0005] In order to overcome the defects of the prior art, the present invention provides an under-pump circulating oil pipe hydraulically controlled environmentally friendly blowout prevention device, which is installed at the lower part of the oil pump barrel and replaces the fixed valve assembly of the oil pump.

[0006] The technical solution of the present invention is: a pump-under circulating oil pipe hydraulic control environmental protection blowout prevention device, characterized in that it includes an upper joint and a pressure pipe installed on the upper part of the oil pump, and a circulating working valve installed on the lower part of the oil pump for repeatedly opening and closing the upper and lower channels, and a circulating pulling system for pulling the ball of the circulating working valve, the top of the circulating working valve is connected to the bottom end of the oil pump; the bottom end of the circulating working valve is connected to the top of the circulating pulling system through a coupling pipe; the two ends of the pressure pipe are connected between one side of the top of the circulating pulling system and one side of the lower end of the upper joint.

[0007] The invention has the advantages that during the process of raising and lowering the pipe string, the channels are closed, and the well fluid will not gush from the inside of the pipe string to the ground, thereby avoiding the pollution caused thereby; and under normal working conditions, the channels are open to ensure normal production. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the main structure of the present invention (also a reference diagram of the working state when going down the well);

[0009] Figure 2 It is a schematic diagram of the shape of the rotating track groove of the present invention. DETAILED DESCRIPTION

[0010] See also Figure 1 The present invention is a pump-under-circulation oil pipe hydraulic control environmental protection blowout prevention device, characterized in that it includes an upper joint 1 and a pressure pipe 2 installed on the upper part of the oil pump 3, a circulation working valve installed on the lower part of the oil pump 3 for repeatedly opening and closing the upper and lower channels, and a circulation pulling system for pulling the ball 7 of the circulation working valve, the top of the circulation working valve is connected to the bottom end of the oil pump 3; the bottom end of the circulation working valve is connected to the top of the circulation pulling system through a coupling pipe 17; the two ends of the pressure pipe 2 are connected between one side of the top of the circulation pulling system and one side of the lower end of the upper joint 1.

[0011] The circulating working valve comprises a ball seat 4, a ball valve body 5, a sealing ring 6, a spring upper retaining ring 8, a ball pressing spring 9, A spring lower retaining ring 10, a pull rod 11, an upper coupling 12, a screen tube 13, a lower coupling 14, a connecting sleeve 15, a nut 16 and the ball 7, the upper end of the ball valve body 5 is connected to the bottom end of the oil pump 3, an inner flange is provided in the upper part of the ball valve body 5 as a valve seat 4, and a sealing ring 6, a ball 7, a spring upper retaining ring 8, a ball pressure spring 9 and a spring lower retaining ring 10 are provided in sequence below the valve seat 4, the top end of the pull rod 11 is connected to the ball 7, and the bottom end of the pull rod 11 is connected to the connecting sleeve 15; the bottom end of the ball valve body 5 is connected to the top end of the screen tube 13 through the upper coupling 12, and a spring lower retaining ring 10 for positioning the bottom end of the ball pressure spring 9 is provided in the ball valve body 5; the bottom end of the screen tube 13 is connected to the top end of the lower coupling 14; a retaining ring is provided in the lower coupling 14 for resisting the connecting sleeve 15; the bottom end of the lower coupling 14 is connected to the top end of the coupling pipe 17.

[0012] The circulating pulling system includes a retaining ring 18, a central axis 19, a lower connecting body 20, an upper O-ring 21, a lower O-ring 22, a track pin 24, a compression spring 25, a spring adjustment retaining ring 26, an outer sleeve 27 and a tail pipe 28. The top of the lower connecting body 20 is connected to the bottom end of the coupling pipe 17, and the central axis 19 is arranged in the lower connecting body 20; an L-shaped through hole 201 communicating with the inside and outside is arranged in the middle of the lower connecting body 20, and the outer end of the L-shaped through hole 201 is connected to the lower end of the pressure-conducting pipe 2, and an upper O-ring 21 and a lower O-ring 22 are respectively arranged between the inner circumference of the lower connecting body 20 and the outer circumference of the central axis 19 at the upper and lower positions corresponding to the L-shaped through hole 201, forming a sealing annular cavity; a rotating track groove 23 capable of repeatedly rotating back and forth 90° is provided on the lower outer circumferential surface of the central shaft 19; a track pin 24 slidingly matched with the rotating track groove 23 is provided on the inner side of the lower connecting body 20; a reduced diameter extension section 191 extending downwardly from the lower connecting body 20 is provided at the bottom end of the central shaft 19, a compression spring 25 is sleeved on the outer periphery of the reduced diameter extension section 191, and an outer sleeve 27 is sleeved on the outer periphery of the compression spring 25; the upper and lower ends of the outer sleeve 27 are respectively connected to the bottom end of the lower connecting body 20 and the upper end of the tail pipe 28 by threads; a spring adjustment retaining ring 26 is installed in the bottom of the outer sleeve 27, and the bottom end of the compression spring 25 is against the upper end of the spring adjustment retaining ring 26.

[0013] See also Figure 2 The shape of the rotating track groove 23 when unfolded is such that the horizontal length is the circumference of the central axis 19, and the overall shape is four zigzag fold lines. The upper four zigzag shapes are the same, which are the opening track a; two of the lower four zigzag shapes are the closing track origins b, and the other two are the opening track origins c, and the closing track origins b and the opening track origins c are arranged alternately. The opening track origin c is a mirror image of the opening track a above (corresponding to the trough above); the tip of the closing track origin b is longer than the tip of the opening track origin c by a certain distance. The functions of the various parts of the rotating track groove 23 can be found in the following working process description.

[0014] An upper protrusion 101 and a lower protrusion 202 are respectively provided at the lower end of the upper joint 1 and the upper end of the lower connecting body 20, which correspond to each other and protrude from the outer peripheral surface. Interfaces for connecting with the two ends of the pressure guiding pipe 2 are provided at the lower end of the upper protrusion 101 and the upper end of the lower protrusion 202.

[0015] The working principle of the present invention is:

[0016] During the process of going down the well, the sealing ring 6 and the ball 7 are tightly fitted together by the ball pressure spring 9 and are in a closed state, blocking the channel of the device. The well fluid below the device cannot enter the channel and go up, which plays a role in preventing blowout. The upper joint 1 is installed on the upper part of the oil pump, and the lower part of the oil pump is connected to the pump-down circulation type oil pipe hydraulic control environmental protection blowout prevention device of the present invention. When normal operation is required, the pump truck is used to pressurize the oil pipe, and the pressure is directly transmitted to the pressure pipe 2 of the upper joint 1, and then transmitted to the sealed annular cavity between the lower connector 20 and the central axis 19 by the pressure pipe 2. After the pressure is applied, the central axis 19 moves linearly along the inner wall of the lower connector 20. At this time, the track pin 24 enters the open track a from the closed track origin b, and the ball 7 is pulled open by the pull rod 11. After the pressure is released, the compression spring 25 is used to make the track pin 24 enter the open track origin c along the rotating track groove 23. Normal operation begins.

[0017] When the channel needs to be closed again, the above process is repeated, and the track pin 24 on the lower connecting body 20 moves from the opening track origin to the closing track origin. The cyclic pulling system of the present invention has the function of being cyclically used repeatedly.

Claims

1. A pump-down circulating oil pipe hydraulic control environmental protection blowout prevention device, characterized in that: It comprises an upper joint (1) and a pressure-conducting pipe (2) installed on the upper part of the oil pump (3), a circulating working valve installed on the lower part of the oil pump (3) for repeatedly opening and closing the upper and lower channels, and a circulating pulling system for pulling a ball (7) of the circulating working valve, wherein the top end of the circulating working valve is connected to the bottom end of the oil pump (3); the bottom end of the circulating working valve is connected to the top end of the circulating pulling system via a coupling pipe (17); and the two ends of the pressure-conducting pipe (2) are connected between one side of the top end of the circulating pulling system and one side of the lower end of the upper joint (1); The circulating working valve comprises a valve seat (4), a ball valve body (5), a sealing ring (6), a spring upper retaining ring (8), a ball pressure spring (9), a spring lower retaining ring (10), a tie rod (11), an upper coupling (12), a screen tube (13), a lower coupling (14), a connecting sleeve (15), a nut (16) and the ball (7). The upper end of the ball valve body (5) is connected to the bottom end of the oil pump (3). An inner flange is provided at the upper part of the ball valve body (5) as a valve seat (4). A sealing ring (6), a ball (7), a spring upper retaining ring (8), a ball pressure spring (9) and a spring lower retaining ring (10) are provided in sequence below the valve seat (4). The top of the tie rod (11) is connected to the bottom end of the oil pump (3). The end of the ball valve body (5) is connected to the ball body (7), and the bottom end of the pull rod (11) is connected to the connecting sleeve (15); the bottom end of the ball valve body (5) is connected to the top end of the screen tube (13) through the upper coupling (12), and a spring lower retaining ring (10) is provided in the ball valve body (5) for positioning the bottom end of the ball pressure spring (9); the bottom end of the screen tube (13) is connected to the top end of the lower coupling (14); a clamping ring is provided in the lower coupling (14) for abutting against the connecting sleeve (15); the bottom end of the lower coupling (14) is connected to the top end of the coupling pipe (17); The cyclic pulling system comprises a retaining ring (18), a central shaft (19), a lower connecting body (20), an upper O-ring (21), a lower O-ring (22), a track pin (24), a compression spring (25), a spring adjustment retaining ring (26), an outer sleeve (27) and a tail pipe (28); the top end of the lower connecting body (20) is connected to the bottom end of the coupling pipe (17); the central shaft (19) is arranged in the lower connecting body (20); an L-shaped through hole (201) communicating with the inside and outside is arranged in the middle of the lower connecting body (20); the outer end of the L-shaped through hole (201) is connected to the lower end of the pressure guiding pipe (2); an upper O-ring (21) and a lower O-ring (22) are respectively arranged between the inner circumference of the lower connecting body (20) and the outer circumference of the central shaft (19) at upper and lower positions corresponding to the L-shaped through hole (201), forming A sealed annular cavity; a rotating track groove (23) capable of repeatedly rotating back and forth 90 degrees is provided on the lower outer circumferential surface of the central shaft (19); a track pin (24) slidably matched with the rotating track groove (23) is provided on the inner side of the lower connecting body (20); the bottom end of the central shaft (19) is provided with a reduced diameter extension section (191) extending downward from the lower connecting body (20); a compression spring (25) is sleeved on the outer circumference of the reduced diameter extension section (191); an outer sleeve (27) is sleeved on the outer periphery of the compression spring (25); the upper and lower ends of the outer sleeve (27) are respectively connected to the bottom end of the lower connecting body (20) and the upper end of the tail pipe (28) by threads; a spring adjustment retaining ring (26) is installed in the bottom of the outer sleeve (27), and the bottom end of the compression spring (25) abuts against the upper end of the spring adjustment retaining ring (26).

2. The pump-under-circulation oil pipe hydraulic control environmental protection blowout prevention device according to claim 1 is characterized in that: An upper protrusion (101) and a lower protrusion (202) are respectively provided at the lower end of the upper joint (1) and the upper end of the lower connecting body (20) and correspond to each other and protrude from the outer peripheral surface. Interfaces for connecting to the two ends of the pressure-conducting pipe (2) are provided at the lower end of the upper protrusion (101) and the upper end of the lower protrusion (202).

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