阅读说明：本技术 泵上球阀式井下油管液控环保防喷装置 (Ball valve type hydraulic control environment-friendly blowout preventer on pump for down-hole oil pipe ) 是由 康庆刚 于 2021-07-26 设计创作，主要内容包括：一种泵上球阀式井下油管液控环保防喷装置,包括上接头、外套拉动体、压缩弹簧、中心管、下接头、定位剪切销钉、推力滑套机构、转向机构和球阀机构,上接头的下端通过螺纹密封连接在中心管上端的外周；外套拉动体套装在该中心管的外周,该上接头的下端与该外套拉动体的上端螺纹连接；在所述的外套拉动体移动28mm位置与上接头之间安装定位剪切销钉；该外套拉动体的下端通过推力滑套机构与套装在中心管下部的转向机构连接；在该转向机构的下端连接有球阀机构。本发明的优点是：在起下管柱过程中,通道都是封闭的,井液不会从管柱内部喷涌到地面,从面避免了因此而造成的污染；而在正常工作状态下,通道是打开的可以保证正常生产。(An upper ball valve type hydraulic control environment-friendly blowout preventer for a downhole oil pipe on a pump comprises an upper joint, an outer sleeve pulling body, a compression spring, a central pipe, a lower joint, a positioning shear pin, a thrust sliding sleeve mechanism, a steering mechanism and a ball valve mechanism, wherein the lower end of the upper joint is hermetically connected to the periphery of the upper end of the central pipe through threads; the outer sleeve pulling body is sleeved on the periphery of the central pipe, and the lower end of the upper joint is in threaded connection with the upper end of the outer sleeve pulling body; a positioning shear pin is arranged between the position of the outer sleeve pulling body moving for 28mm and the upper joint; the lower end of the outer sleeve pulling body is connected with a steering mechanism sleeved at the lower part of the central tube through a thrust sliding sleeve mechanism; the lower end of the steering mechanism is connected with a ball valve mechanism. The invention has the advantages that: in the process of tripping the pipe column, the channels are closed, so that well fluid cannot gush to the ground from the interior of the pipe column, and pollution caused by the well fluid is avoided; and under the normal working condition, the channel is opened to ensure the normal production.)

1. The hydraulic control environment-friendly blowout preventer is characterized by comprising an upper joint (1), an outer sleeve pulling body (3), a compression spring (4), a central pipe, a spherical shell lower connecting body (24), a single flow channel (25), a lower joint (26), a positioning shear pin (2), a thrust sliding sleeve mechanism, a steering mechanism and a ball valve mechanism, wherein the lower end of the upper joint (1) is hermetically connected to the periphery of the upper end of the central pipe through threads; the upper part and the lower part of the outer sleeve pulling body (3) are respectively sleeved on the periphery of the lower end of the upper joint (1) and the periphery of the central pipe; a radial positioning shear pin (2) is arranged between the outer sleeve pulling body (3) and the upper joint (1); the lower end of the outer sleeve pulling body (3) is connected with a steering mechanism arranged at the lower part of the central tube through a thrust sliding sleeve mechanism; the lower end of the steering mechanism is connected with a ball valve mechanism.

2. The upper ball valve type hydraulic-controlled environment-friendly blowout preventer for the downhole oil pipe on the pump according to claim 1, wherein the central pipe is formed by coaxially sealing and butting an upper central pipe (5) and a lower central pipe (6) through a central pipe connecting sleeve (30).

3. The on-pump ball valve type downhole tubing hydraulic control environment-friendly blowout preventer as claimed in claim 2, wherein the thrust sliding sleeve mechanism comprises: the device comprises a compression spring (4), a sliding sleeve (7), an upper O-shaped sealing ring (8), a lower O-shaped sealing ring (9) and an outer sleeve (28), wherein the compression spring (4) is sleeved on the periphery of an upper central pipe (5) below an outer sleeve pulling body (3), the lower end of the compression spring (4) is provided with the sliding sleeve (7), and the sliding sleeve (7) is sleeved on the periphery of the upper central pipe (5); an outer sleeve (28) is arranged on the outer peripheral surface of the compression spring (4); the pipe wall of the lower central pipe (6) covered by the sliding sleeve (7) is provided with a plurality of radial through holes (10) distributed along the circumference, and the inner circumference of the sliding sleeve (7) is provided with an upper O-shaped sealing ring (8) and a lower O-shaped sealing ring (9) in a distribution way corresponding to the upper and lower positions of the radial through holes (10).

4. The on-pump ball valve type downhole tubing hydraulic-control environment-friendly blowout preventer as claimed in claim 3, wherein the outer casing (28) is two-section and is coaxially butted through an outer casing connecting sleeve (29), and the position of the outer casing connecting sleeve (29) corresponds to the position of the central pipe connecting sleeve (30); the two sections of outer sleeves (28) are respectively provided with one compression spring (4).

5. The ball-on-pump valve type downhole tubing hydraulic-controlled environment-friendly blowout preventer as claimed in claim 4, wherein the steering mechanism comprises a sliding connecting sleeve (12), a rotating connecting sleeve (13), a sliding sleeve (16) and a spherical shell upper connector (17), and a rotating track (14) capable of rotating 15 degrees is arranged on the outer peripheral surface of the spherical shell upper connector (17); the upper end of the sliding connecting sleeve (12) is connected with the lower end of the sliding sleeve (7) through threads, and the lower end of the sliding connecting sleeve (12) is connected with the upper end of the rotating connecting sleeve (13) through a set screw (11); a sliding pin (15) corresponding to the rotating track (14) is arranged on the rotating connecting sleeve (13); the upper end inner circumference of the spherical shell upper connector (17) is installed on the bottom outer circumference of the lower central tube (6) through a thread sealing sleeve and extends upwards to the inner side of the lower end of the rotary connecting sleeve (13); the bottom end of the rotating connecting sleeve (13) and the top end of the sliding sleeve (16) are welded together after the assembly is finished.

6. The ball-on-pump type downhole tubing hydraulic-control environment-friendly blowout preventer as claimed in claim 5, wherein the ball valve mechanism comprises a left steering slider (20), a right steering slider (27), a ball valve rod (21), a ball housing (22), a ball (23), a valve sleeve (18) and a valve seat (19), the upper end of the ball housing (22) is connected with the outer periphery of the lower end of the ball housing upper connector (17) in a sealing manner through threads, and the outer periphery of the upper part of the ball housing (22) is sleeved on the inner side of the lower part of the sliding sleeve (16); the upper end of the valve sleeve (18) is connected with the lower end of the spherical shell upper connector (17), and the lower end of the valve sleeve (18) is connected with a valve seat (19); a hollow ball body (23) is arranged in the valve seat (19); a ball valve rod (21) along a diameter line is fixedly connected to each side of the ball (23), a left steering slide block (20) is arranged on the periphery of each left ball valve rod (21), and a right steering slide block (27) is connected with the ball valve rods (21) through splines.

Technical Field

The invention relates to an on-pump ball valve type downhole oil pipe hydraulic control environment-friendly blowout preventer, which is a device for preventing well liquid from being sprayed out of a pipe column in the process of pulling up and pulling down the pipe column in oil field production operation, and belongs to the technical field of oil field application.

Background

At present, before normal production operation, an oil pumping well needs to put a pipe string formed by serially connecting oil pipes to the bottom of the well, an oil well pump and other downhole tools are installed below the pipe string, and an inner hole of the pipe string is a channel for up-and-down reciprocating motion of a rod string and is also a channel for discharging well liquid, so that the oil pumping well needs to be smooth in the working process. When the well is repaired, the rod column needs to be lifted out of the pipe column, then the pipe column is lifted out of the well, and the oil well pump can be lifted out of the ground for repair, so that the pipe column needs to be lifted out of the ground when the well is repaired and before normal production.

The underground formation pressure has high or low, and for some low-pressure wells, the liquid level in the well is far lower than the well head, and crude oil in the pipe column needs to be discharged underground in the process of lifting the pipe column, so that the pollution caused by bringing the pipe column to the ground is prevented. For some high-pressure wells, the pressure in the well continuously lifts well liquid to be sprayed out of the well mouth, so that the well liquid in the well can be continuously sprayed out of the ground from the inside of the pipe column in the pipe column running process, not only can the ground be polluted, but also potential safety hazards exist. Under the condition, the inner hole of the pipe column needs to be closed when the pipe column is put into the well, the inner hole of the pipe column needs to be completely opened in the working process to ensure the smoothness of the inner hole of the pipe column, and then the pipe column is plugged again before being lifted up in the well repairing operation. A device with these three functions can accomplish this task.

The prior art can not well complete the whole operation process, a plurality of devices can only complete a single underground closing action, and the inner hole of the tubular column can not be closed when the tubular column is lifted, so that well liquid is often sprayed out of the ground, and serious pollution and potential safety hazards are caused.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an upper ball valve type underground oil pipe hydraulic control environment-friendly blowout preventer of a pump, which is arranged at the upper part of a pump cylinder of an oil well pump and replaces a fixed valve assembly of the oil well pump.

The technical scheme of the invention is as follows: an upper ball valve type hydraulic control environment-friendly blowout preventer for a downhole oil pipe on a pump is characterized by comprising an upper joint, an outer sleeve pulling body, a compression spring, a central pipe, a lower joint, a positioning shear pin, a thrust sliding sleeve mechanism, a steering mechanism and a ball valve mechanism, wherein the lower end of the upper joint is hermetically connected to the periphery of the upper end of the central pipe through threads; the outer sleeve pulling body is sleeved on the periphery of the central pipe, and the lower end of the upper joint is in threaded connection with the upper end of the outer sleeve pulling body; a positioning shear pin is arranged between the position of the outer sleeve pulling body moving for 28mm and the upper joint; the lower end of the outer sleeve pulling body is connected with a steering mechanism sleeved at the lower part of the central tube through a thrust sliding sleeve mechanism; the lower end of the steering mechanism is connected with a ball valve mechanism.

The invention has the advantages that: in the process of tripping the pipe column, the channels are closed, so that well fluid cannot gush to the ground from the interior of the pipe column, and pollution caused by the well fluid is avoided; and under the normal working condition, the channel is opened to ensure the normal production.

Drawings

FIG. 1 is a schematic view of the main structure of the present invention (also referred to as the working state in the process of lowering the well);

fig. 2 is a sectional view a-a of fig. 1.

Detailed Description

The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.

Referring to fig. 1 and 2, the hydraulic control environment-friendly blowout preventer for the ball valve type downhole oil pipe on the pump is characterized by comprising an upper joint 1, an outer sleeve pulling body 3, a compression spring 4, a central pipe, a spherical shell lower joint body 24, a single flow channel 25, a lower joint 26, a positioning shear pin 2, a thrust sliding sleeve mechanism, a steering mechanism and a ball valve mechanism, wherein the lower end of the upper joint 1 is hermetically connected to the periphery of the upper end of the central pipe through threads; the upper part and the lower part of the outer sleeve pulling body 3 are respectively sleeved on the periphery of the lower end of the upper joint 1 and the periphery of the central pipe; a radial positioning shear pin 2 is arranged between the outer sleeve pulling body 3 and the upper joint 1; the lower end of the outer sleeve pulling body 3 is connected with a steering mechanism arranged at the lower part of the central tube through a thrust sliding sleeve mechanism; the lower end of the steering mechanism is connected with a ball valve mechanism.

The central tube is formed by coaxially and hermetically butting an upper central tube 5 and a lower central tube 6 through a central tube connecting sleeve 30.

The thrust sliding sleeve mechanism comprises: the compression spring 4 is sleeved on the periphery of an upper central tube 5 below the outer sleeve pulling body 3, the lower end of the compression spring 4 is provided with the sliding sleeve 7, and the sliding sleeve 7 is sleeved on the periphery of the upper central tube 5; an outer sleeve 28 is provided on the outer peripheral surface of the compression spring 4; a plurality of radial through holes 10 distributed along the circumference are arranged on the pipe wall of the lower central pipe 6 covered by the sliding sleeve 7, and an upper O-shaped sealing ring 8 and a lower O-shaped sealing ring 9 are distributed on the inner circumference of the sliding sleeve 7 corresponding to the upper and lower positions of the radial through holes 10.

The outer sleeve 28 is two-section and is coaxially butted through an outer sleeve connecting sleeve 29, and the position of the outer sleeve connecting sleeve 29 corresponds to the central pipe connecting sleeve 30; two compression springs 4 are respectively arranged in the two outer sleeves 28.

The steering mechanism comprises a sliding connecting sleeve 12, a rotating connecting sleeve 13, a sliding sleeve 16 and a spherical shell upper connecting body 17, wherein a rotating track 14 capable of rotating by 15 degrees is arranged on the peripheral surface of the spherical shell upper connecting body 17; the upper end of the sliding connecting sleeve 12 is connected with the lower end of the sliding sleeve 7 through threads, and the lower end of the sliding connecting sleeve 12 is connected with the upper end of the rotating connecting sleeve 13 through a set screw 11; a sliding pin 15 corresponding to the rotating track 14 is arranged on the rotating connecting sleeve 13; the upper inner circumference of the spherical shell upper connector 17 is mounted on the bottom outer circumference of the lower central tube 6 through a thread seal sleeve and extends upwards to the inner side of the lower end of the rotary connecting sleeve 13; the bottom end of the rotating connecting sleeve 13 and the top end of the sliding sleeve 16 are welded together after the assembly is finished.

The ball valve mechanism comprises a left steering slide block 20, a right steering slide block 27, a ball valve rod 21, a ball shell 22, a ball 23, a valve sleeve 18 and a valve seat 19, wherein the upper end of the ball shell 22 is hermetically connected with the periphery of the lower end of the ball shell upper connector 17 through threads, and the periphery of the upper part of the ball shell 22 is sleeved on the inner side of the lower part of the sliding sleeve 16; the upper end of the valve sleeve 18 is connected with the lower end of the spherical shell upper connector 17, and the lower end of the valve sleeve 18 is connected with a valve seat 19; a hollow ball 23 is provided in the valve seat 19; each fixedly connected with along the spheroid valve rod 21 of diameter line in the both sides of this spheroid 23, spheroid valve rod 21 sets up along spheroid 23 diameter, and spheroid valve rod 21 and spheroid 23 are the keyway connection, during the installation from inside to outside installation spheroid valve rod 21 in spheroid shell 22, reuse the recess installation spheroid 23 of spheroid 23 both sides. A left steering slider 20 is provided on the outer periphery of each of the left ball valve rods 21, and a right steering slider 27 is spline-connected to the ball valve rods 21.

The working principle of the invention is as follows:

as shown in figure 1, in the process of descending the well, the ball 23 is in a closed state, the channel of the device is blocked, well fluid cannot enter the channel to ascend, and the function of blowout prevention is achieved.

As shown in fig. 1-2, when normal operation is required, the pump truck is used to positively press the oil pipe, and the pressure is directly transmitted to the sealed annular cavity between the lower central pipe 6 and the sliding sleeve 7. The pressure-bearing rear sliding sleeve 7 moves linearly along the outer wall of the lower central tube 6. The locating pin is cut off, and the sliding pin 15 on the rotating connecting sleeve 13 moves forwards continuously along the first rotating track on the spherical shell upper connecting body 17. At the same time, the sliding sleeve 16 is pushed and the ball 23 is rotated by 90 degrees by the teeth on the sleeve through the left steering slide block 20 and the ball valve rod 21, and the channel is opened. After the pressure is released, the sliding pin on the rotating connecting sleeve 13 is retracted to the original point along the first rotating track on the spherical shell upper connector 17 by using the compression spring 4, and simultaneously enters the second rotating track. And normal operation is started.

When the channel needs to be closed again, the pump truck is used for pressurizing the oil pipe again, and the pressure is directly transmitted to the sealed annular cavity between the lower central pipe 6 and the sliding sleeve 7. The pressure-bearing rear sliding sleeve 7 moves linearly along the outer wall of the lower central tube 6. The sliding pin 15 on the rotating connecting sleeve 13 is advanced along the second rotating track on the ball-housing upper connecting body 17. At this time, the rotating connecting sleeve 13 pushes the sliding sleeve 16 to rotate by 15 degrees and uses the teeth on the sleeve to rotate the ball 23 by 90 degrees again through the right steering slide block 27 and the ball valve rod 21 to close the channel. After the pressure is released, the sliding pin 15 on the rotating connecting sleeve 13 is retracted to the original point along the second rotating track on the spherical shell upper connector 17 by the compression spring 4.