CN110566450B

CN110566450B - Hydraulic control blowout prevention device for oil pipe under pump

Info

Publication number: CN110566450B
Application number: CN201910924962.9A
Authority: CN
Inventors: 康庆刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-12
Filing date: 2019-09-27
Publication date: 2024-12-06
Anticipated expiration: 2039-09-27
Also published as: CN110566450A

Abstract

The utility model provides a tubing liquid accuse blowout preventer under pump, its device includes top connection, urceolus, lower clutch, tubular column lift valve, working valve and tubular column well valve, is equipped with the tubular column lift valve that can be with the interior upper and lower passageway confined of tubular column when lifting the tubular column in this top connection hole lower part and urceolus inside, the periphery of this top connection is connected with the upper end of urceolus through the screw thread, threaded connection has the working valve that can seal upper and lower passageway at the during operation between the lower extreme of this urceolus and the lower clutch inside be equipped with can be with the interior tubular column well valve of passageway confined when tubular column well is gone into. The invention has the advantages that the channel is closed in the process of tripping the pipe column, well fluid cannot be sprayed from the inside of the pipe column to the ground, pollution caused by the surface is avoided, and the channel is opened in a normal working state, so that normal production can be ensured.

Description

Hydraulic control blowout preventer for oil pipe under pump

Technical Field

The invention relates to a hydraulic control blowout preventer for a pump oil pipe, which is used for preventing well fluid from being ejected from a pipe column in the process of lifting and lowering the pipe column in the oilfield production operation, and belongs to the technical field of oilfield application.

Background

At present, a tubular column formed by connecting oil pipes in series needs to be lowered to the bottom of a well before normal production operation of an oil pumping well, an oil pump and other downhole tools are installed below the tubular column, an inner hole of the tubular column is a channel for reciprocating motion of the tubular column up and down, and meanwhile, the inner hole of the tubular column is a channel for discharging well fluid, and the inner hole is required to be unobstructed in the working process. When the well is repaired, the rod column is lifted out of the pipe column, and then the pipe column is lifted out of the well, so that the oil well pump can be lifted out of the ground for maintenance, and the pipe column lifting operation is needed when the well is needed and before normal production.

The underground stratum pressure is high or low, and for some low-pressure wells, the liquid level in the well is far lower than that of the well mouth, so that crude oil in the pipe column needs to be discharged underground in the process of lifting the pipe column, and pollution caused by bringing the crude oil to the ground is prevented. For some high-pressure wells, the pressure in the well continuously lifts the well liquid to be sprayed out of the wellhead, 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 lifting process, the ground pollution can be caused, and potential safety hazards exist. In this case, the inner hole of the pipe column needs to be closed when the pipe column is lowered into the well, and the pipe column needs to be completely opened to ensure smoothness in the working process, and then the pipe column is plugged again before the pipe column is lifted up in the well repairing operation. The device with the three functions can complete the work.

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

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a hydraulic control blowout preventer for a lower oil pipe of a pump, which is arranged at the lower part of a pump cylinder of an oil pump to replace a fixed valve assembly of the oil pump.

The hydraulic control blowout preventer for the lower oil pipe of the pump is characterized by comprising an upper joint, an outer barrel, a lower joint, a pipe column lifting valve, a working valve and a pipe column well descending valve, wherein the pipe column lifting valve capable of sealing an upper channel and a lower channel in the pipe column when the pipe column is lifted up is arranged at the lower part of an inner hole of the upper joint and inside the outer barrel, the periphery of the upper joint is connected with the upper end of the outer barrel through threads, the working valve capable of sealing the upper channel and the lower channel when the pipe column is in a well descending state is connected between the lower end of the outer barrel and the lower joint through threads, and the pipe column well descending valve capable of sealing the inner channel of the pipe column when the pipe column is in a well descending state is arranged inside the lower joint.

The invention has the advantages that the channel is closed in the process of tripping the pipe column, well fluid cannot be sprayed from the inside of the pipe column to the ground, pollution caused by the surface is avoided, and the channel is opened in a normal working state, so that normal production can be ensured.

Drawings

FIG. 1 is a schematic diagram of the main structure of the present invention (also referred to as a working state reference diagram when the present invention is in a well);

FIG. 2 is a reference diagram of the normal operating condition of FIG. 1;

Fig. 3 is a state reference diagram when the string is lifted up in fig. 1.

Detailed Description

The invention will be further described with reference to specific embodiments, and advantages and features of the invention will become apparent from the description. These examples are merely exemplary and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes and substitutions of details and forms of the technical solution of the present invention may be made without departing from the spirit and scope of the present invention, but these changes and substitutions fall within the scope of the present invention.

Referring to fig. 1-3, the hydraulic control blowout preventer for the tubing under the pump is characterized by comprising an upper joint 1, an outer cylinder 3, a lower joint 16, a tubing string lifting valve, a working valve and a tubing string well descending valve, wherein the tubing string lifting valve capable of sealing an upper channel and a lower channel in the tubing string when lifting the tubing string is arranged at the lower part of an inner hole of the upper joint 1 and inside the outer cylinder 3, the periphery of the upper joint 1 is connected with the upper end of the outer cylinder 3 through threads, the working valve capable of sealing the upper channel and the lower channel when working is arranged between the lower end of the outer cylinder 3 and the lower joint 16 is arranged at the lower joint 16, and the tubing string well descending valve capable of sealing the inner channel of the tubing string when the tubing string is in a well descending mode is arranged inside the lower joint 16.

The pipe column lifting valve comprises a blowout prevention female sleeve 2, a blowout prevention ball rod 4, a spring 5, a seat sealing constant pressure shear pin 6, a thrust plunger 7, an upper O-shaped sealing ring 8, a lower O-shaped sealing ring 9 and a cylinder body 10, wherein the periphery of the blowout prevention female sleeve 2 is connected with the lower part of an inner hole of the upper joint 1 through threads, the cylinder body 10 is arranged below the blowout prevention female sleeve 2, the thrust plunger 7 and the blowout prevention ball rod 4 are arranged in an axial hole of the cylinder body 10 from bottom to top, the top end of the blowout prevention ball rod 4 extends out of the top end of the cylinder body 10 and is provided with a ball 41, the outside of the blowout prevention ball rod 4 between the ball 41 and the top end of the cylinder body 10 is provided with the spring 5, a radial screw hole is arranged on the side wall of the upper part of the cylinder body 10 and is filled with the seat sealing constant pressure shear pin 6, the inner end of the seat sealing constant pressure shear pin 6 is detected into a hole on the upper part of the upper joint 1, the side wall of the cylinder body 10 is provided with the thrust plunger 7 and the thrust plunger 4 from bottom to top, the side wall of the lower part of the cylinder body 10 is provided with the thrust plunger 7 communicated with the outer part of the outer cylinder 3, the thrust plunger 101 is arranged at the bottom end of the pressure release hole 101 is arranged at the side wall 101 corresponding to the upper end of the pressure release hole 101 of the cylinder body 7 and the upper part of the pressure release hole 101 is arranged at the pressure release hole 101. The bottom end of the cylinder body 10 is connected with a boss 131 at the top end of the valve housing 13 by screw threads.

The working valve comprises a valve ball 11, a valve seat 12 and a valve cover 13, wherein the outer periphery of the upper end of the valve cover 13 is connected with the inner periphery of the lower end of the outer cylinder 3 through threads, a convex column 131 is arranged at the top end of the valve cover 13, the bottom end of the cylinder body 10 is arranged on the convex column 131 through threads, an overflow hole 132 penetrating through the upper end and the lower end of the valve cover 13 is arranged beside the convex column 131, the middle part of the valve cover 13 is provided with the valve seat 12 (positioned below a diameter-reducing step in the middle part of the valve cover 13), the top end of the valve seat 12 is provided with the valve ball 11, the lower end of the valve cover 13 is connected with the lower joint 16 through threads, and the top end of the lower joint 16 abuts against the bottom end of the valve seat 12.

The tubular column well descending valve comprises an O-shaped sealing ring (14), a deblocking constant pressure shear pin 15 and a sealing plug 17, wherein the sealing plug 17 is connected with the inner part of the lower joint 16 in a threaded mode, a side hole is formed in the side face of the sealing plug 17, a radial screw hole is formed in the side wall of the lower joint 16, the deblocking constant pressure shear pin 15 is installed in the screw hole, the inner end of the deblocking constant pressure shear pin penetrates into the side hole of the sealing plug 17, the O-shaped sealing ring (14) is installed on the periphery of the sealing plug 17, a push rod 171 is arranged at the top end axis of the sealing plug 17, the top end of the push rod extends upwards to penetrate through the valve seat 12 and abuts against the bottom face of the valve ball 11, and the valve ball 11 is positioned at a position away from the valve seat 12.

The shearing pressure of the seat sealing fixed pressure shear pin 6 is larger than the shearing pressure of the unsealing fixed pressure shear pin 15.

The outer cylinder 3 and the cylinder body 10 are welded together after the assembly is completed.

The working principle of the invention is as follows:

As shown in fig. 1, in the process of going into the well, the sealing plug 17 plugs the channel of the device, well fluid cannot enter the channel to ascend, so that a blowout prevention effect is achieved, at the moment, the valve ball 11 is separated from the valve seat 12, the top space can ensure that the pressure in the pipe column directly reaches the sealing plug 17, and the blowout prevention club 4 keeps potential energy under the action of the spring 5.

As shown in fig. 2, when the normal operation is required, the pressure is directly transmitted to the sealing plug 17 from the inside of the pipe column and pushes the sealing plug 17 to move downwards to shear the unsealing constant pressure shear pin 15, after the unsealing constant pressure shear pin 15 is sheared, the sealing plug 17 continues to slide downwards to drop into the tail pipe of the pipe column from the lower joint 16, the channel is opened, the valve ball 11 returns to the working position at the moment, the normal operation can be realized, and the potential energy of the blowout preventer 4 is kept under the action of the spring 5 at the moment.

As shown in fig. 3, when the pipe column is required to be lifted, the pipe column is lifted out of the pipe column, then the pipe column is pressed into the pipe column, and because the valve ball 11 and the valve seat 12 are in a closed state, pressure enters the bottom end of the thrust plunger 7 from the air inlet hole 102, the thrust plunger 7 is pushed to move upwards, the thrust plunger 7 pushes the blowout preventer pole 4 to shear the seat sealing fixed pressure shear pin 6, the blowout preventer pole 4 is sprung upwards under the action of the spring 5 after the seat sealing fixed pressure shear pin 6 is sheared, and after the ball 41 at the top end of the blowout preventer pole 4 enters the inner hole of the blowout preventer female sleeve 2, a channel is blocked to realize seat sealing, and liquid in the pipe column is sealed in a well.

Because the shearing pressure of the seat sealing fixed pressure shear pin 6 is larger than that of the unsealing fixed pressure shear pin 15, well fluid needs to enter from below in normal operation, the unsealing fixed pressure shear pin 15 is broken to release the sealing plug 17 to the lower side, and at the moment, the seat sealing fixed pressure shear pin 6 is not moved, and the blowout preventer 4 is also not moved. When lifting is needed, the thrust plunger 7 is pushed by pressure, so that the thrust plunger 7 pushes the blowout preventer 4 to move upwards, and the seat seal constant pressure shear pin 6 is broken, so that the blowout preventer 4 is pushed to move upwards.

Claims

1. A pump-down oil pipe hydraulic control blowout prevention device, characterized in that it comprises an upper joint (1), an outer tube (3), a lower joint (16), a pipe column lifting valve, a working valve and a pipe column downhole valve, wherein the pipe column lifting valve capable of closing the upper and lower passages in the pipe column when the pipe column is lifted is installed in the lower part of the inner hole of the upper joint (1) and inside the outer tube (3), the outer periphery of the upper joint (1) is connected to the upper end of the outer tube (3) by a thread, the lower end of the outer tube (3) and the lower joint (16) are threadedly connected with a working valve capable of closing the upper and lower passages when working, and the lower joint (16) is installed with a pipe column downhole valve capable of closing the passage in the pipe column when the pipe column is downhole;

The pipe column lifting valve comprises: a blowout prevention sleeve (2), a blowout prevention ball rod (4), a spring (5), a seat seal constant pressure shear pin (6), a thrust plunger (7), an upper O-ring (8), a lower O-ring (9) and a cylinder body (10). The outer periphery of the blowout prevention sleeve (2) is connected to the lower part of the inner hole of the upper joint (1) through a thread; the cylinder body (10) is arranged below the blowout prevention sleeve (2), and the thrust plunger (7) and the blowout prevention ball rod (4) are installed from bottom to top in the axial hole of the cylinder body (10). The top end of the blowout prevention ball rod (4) extends out of the top end of the cylinder body (10) and is provided with a ball (41). The spring (5) is installed outside the blowout prevention ball rod (4) between the ball (41) and the top end of the cylinder body (10); a spring (5) is installed outside the blowout prevention ball rod (4) between the ball (41) and the top end of the cylinder body (10); a spring (5) is installed outside the blowout prevention ball rod (4) on the side of the upper part of the cylinder body (10). A radial screw hole is provided on the wall, and a seat sealing fixed pressure shear nail (6) is installed therein, the inner end of the seat sealing fixed pressure shear nail (6) is inserted into the hole on the anti-blowout ball rod (4), and the anti-blowout ball rod (4) is positioned on the cylinder body (10) through the seat sealing fixed pressure shear nail (6); a pressure relief hole (101) communicating with the outside of the outer cylinder (3) is provided on the lower side wall of the cylinder body (10), and the outer end of the pressure relief hole (101) is welded to the inner wall of the outer cylinder (3); a pressurizing hole (102) is provided on the side wall of the cylinder body (10) below the pressure relief hole (101), and the pressurizing hole (102) is located at the bottom end of the thrust plunger (7); an upper O-type sealing ring (8) and a lower O-type sealing ring (9) are respectively installed on the thrust plunger (7) above and below the pressure relief hole (101);

The downhole valve of the tubing column comprises an O-type sealing ring (14), an unsealing constant pressure shear nail (15) and a sealing plug (17); the sealing plug (17) is connected to the inner thread of the lower joint (16), and a side hole is provided on the side of the sealing plug (17); a radial screw hole is provided on the side wall of the lower joint (16), and the unsealing constant pressure shear nail (15) is installed in the screw hole, and the inner end of the nail is inserted into the side hole of the sealing plug (17); an O-type sealing ring (14) is installed on the outer periphery of the sealing plug (17); a push rod (171) is provided at the top axis of the sealing plug (17), the top end of which extends upward through the valve seat (12) of the working valve and abuts against the bottom surface of the valve ball (11) of the working valve, so that the valve ball (11) is positioned away from the valve seat (12);

The shearing pressure of the sealing constant-pressure shearing pin (6) is greater than the shearing pressure of the unsealing constant-pressure shearing pin (15).

2. The pump down oil pipe hydraulic control blowout prevention device according to claim 1 is characterized in that the working valve comprises a valve ball (11), a valve seat (12) and a valve cover (13); the outer periphery of the upper end of the valve cover (13) is connected to the inner periphery of the lower end of the outer cylinder (3) by means of a thread; a boss (131) is provided at the top end of the valve cover (13); the bottom end of the cylinder body (10) is mounted on the boss (131) by means of a thread; a flow hole (132) penetrating the top and bottom of the top end of the valve cover (13) is provided next to the boss (131); a valve seat (12) is installed in the middle of the valve cover (13); a valve ball (11) is provided at the top end of the valve seat (12); the lower end of the valve cover (13) is connected to the lower joint (16) by means of a thread; the top end of the lower joint (16) abuts against the bottom end of the valve seat (12).

3. The pump-down oil pipe hydraulically controlled blowout prevention device according to claim 1, characterized in that the outer tube (3) and the cylinder body (10) are welded together after assembly.