Double-channel hydraulic control downhole test blowout prevention pipe

Abstract

The invention discloses a double-channel hydraulic control downhole testing blowout prevention pipe and belongs to the technical field of oil field water injection wells. Comprising an upper connector, a first pressure transmitting pipe, a second pressure transmitting pipe, a connecting pipe, a sealing pipe, a piston and the like. The first pressure transmission pipe is used for pressing on the ground to close a ball valve in the dual-channel hydraulic control downhole testing blowout prevention pipe, high-pressure liquid in a well is sealed at the lower part of the ball valve, and at the moment, a testing tool or a steel wire tool can be tripped in after the high-pressure liquid in an oil pipe at the upper part is discharged; and when the ball valve needs to be opened, the second pressure transmission pipe is used for pressing on the ground. According to the tool, the working procedures of blowout-prevention-pipe-free cable testing, steel wire operation, quick valve replacement and the like are achieved, the danger of high-altitude operation and the complexity that the valve can be replaced only through well killing or operation construction are well avoided, and therefore a large amount of cost can be saved, and high economic value is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield water injection wells, and particularly relates to a double-channel hydraulically controlled downhole test blowout preventer. Background Art

[0002] At present, when conducting cable testing or using wireline tools in oil field water injection wells, it is necessary to connect the blowout preventer to the upper part of the wellhead Christmas tree before lowering the tool. Since the height of the blowout preventer reaches 3-5 meters, it is necessary to climb to a height of 3-5 meters from the ground to ensure the smooth lowering of the tool. This is a high-altitude operation during the operation and is somewhat dangerous.

[0003] When the wellhead tubing valves of high-pressure gas wells, rodless pump oil production wells and conventional injection wells fail, they can only be replaced after killing the well or performing construction work, which will greatly increase the operating cost. Summary of the invention

[0004] In view of the above shortcomings, the purpose of the present invention is to provide a dual-channel hydraulically controlled downhole test blowout preventer to solve the dangers brought by high-altitude operations and the problem of rapid replacement of wellhead valves.

[0005] The technical solution adopted by the invention is: a dual-channel hydraulically controlled downhole test blowout preventer, the technical key points of which are: comprising a connecting pipe, an upper joint sleeved outside the connecting pipe and threadedly connected to the connecting pipe, a pressure transmission sleeve sleeved outside the connecting pipe and threadedly connected to the connecting pipe, a sealing pipe inserted into the pressure transmission sleeve and threadedly connected to the pressure transmission sleeve, a ball valve outer tube sleeved outside the pressure transmission sleeve and threadedly connected to the pressure transmission sleeve, an upper ball seat sleeved outside the sealing pipe and threadedly connected to the sealing pipe, a spacer sleeve sleeved outside the sealing pipe and one end of which is inserted into the pressure transmission sleeve and the other end is inserted into the upper ball seat, a cavity for passing liquid is formed between the sealing pipe and the spacer sleeve; a movable sleeve sleeved outside the spacer sleeve The plug is inserted into the outer tube of the ball valve at the same time, and the piston moves left and right in the cavity between the pressure transmission sleeve and the upper ball seat; the rack sleeve is connected to the outer tube of the upper ball seat, and the rack sleeve is threaded with the piston and moves synchronously with the piston; the first sealing seat is inserted into the upper ball seat, and the second sealing seat is inserted into the lower ball seat, and the valve ball meshed with the rack sleeve is installed between the two sealing seats, and the sealing seat and the valve ball are both in spherical contact; the lower ball seat is connected to the outer tube of the lower ball seat, and a spring is provided between the lower ball seat and the lower joint, and the spring is used to push the lower ball seat to move so that the sealing seat and the valve ball contact surface have a certain contact stress, so that the valve ball is sealed when closed; the lower joint is threaded with the outer tube of the ball valve; A transition sleeve is arranged outside the upper joint, the transition sleeve is connected to the protective sleeve, the protective sleeve is connected to the pressure transmission sleeve, a first pressure transmission pipe is arranged in the upper cavity between the protective sleeve and the connecting pipe, one end of the first pressure transmission pipe is connected to the pressure transmission sleeve and welded by argon arc welding, and the other end passes through the transition sleeve and is led out to the wellhead; a second pressure transmission pipe is arranged in the lower cavity between the protective sleeve and the connecting pipe, one end of the second pressure transmission pipe is connected to the pressure transmission sleeve and welded by argon arc welding, and the other end passes through the transition sleeve and is led out to the wellhead.

[0006] In the above scheme, a boss is provided on the surface of the gear, and the boss has a mounting hole arranged coaxially with the gear. The valve ball is provided with a channel running through the interior thereof. Two opposite planes are also provided on the surface of the valve ball, and a groove is provided on the plane for plugging and cooperating with the boss of the gear. A positioning connecting column is provided in the groove for plugging and cooperating with the mounting hole on the boss.

[0007] In the above scheme, the rack sleeve includes a sleeve, a first rack arm and a second rack arm connected to the sleeve and arranged opposite to each other. Both rack arms are provided with racks arranged along the length direction of the rack arms for kneading with the gear transmission.

[0008] In the above scheme, the valve ball is installed between the first rack arm and the second rack arm of the rack sleeve, and one of the two opposite planes on the valve ball faces the first rack arm, and the other faces the second rack arm.

[0009] In the above scheme, a gear pressing cap is inserted on the gear of the gear to prevent the gear from moving.

[0010] The beneficial effects of the present invention are as follows: the dual-channel hydraulically controlled downhole test blowout preventer is connected to the lower end of the oil pipe when the pipe string is lowered into the well, and the first pressure transmission pipe and the second pressure transmission pipe are led out to the outside of the wellhead big four-way, and the ball valve inside the dual-channel hydraulically controlled downhole test blowout preventer is closed by pressing the first pressure transmission pipe on the ground, and the high-pressure liquid in the well is sealed at the bottom of the ball valve. At this time, the high-pressure liquid in the upper oil pipe is released, and the test tool or the steel wire tool can be lowered, and the wellhead oil pipe valve can also be replaced. When the ball valve needs to be opened, it can be pressed on the ground through the second pressure transmission pipe. The tool can realize the processes such as blowout preventer-free cable testing, steel wire operation, and rapid valve replacement, which well avoids the danger of high-altitude operation and the complexity of replacing the valve after well killing or operation construction, so it can save a lot of expenses and has high economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 The double-channel hydraulically controlled downhole test blowout preventer structure in the embodiment of the present invention; Figure 2 for Figure 1 Middle AA view; Figure 3 Schematic diagram of the structure of the sealing tube in this embodiment; Figure 4 This is a schematic diagram of the structure of the valve ball in this embodiment; Figure 5 Schematic diagram of the rack sleeve structure in this embodiment; Figure 6 It is a partial enlarged view of this embodiment; The serial numbers in the figure are explained as follows: 1 upper joint, 2 transition sleeve, 3 protective sleeve, 4 first pressure transmission tube A, 5 second pressure transmission tube B, 6 connecting pipe, 7 pressure transmission sleeve, 8 sealing tube, 9 ball valve outer tube, 10 spacer sleeve, 11 piston, 12 upper ball seat, 13 rack sleeve, 14 sealing seat, 15 lower ball seat, 16 lower joint, 17 spring, 18 gear pressure cap, 19 gear, 20 valve ball. DETAILED DESCRIPTION

[0013] To make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1-Figure 6 The present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

[0014] The dual-channel hydraulically controlled downhole test blowout preventer used in this embodiment has the following specific structure: the connecting pipe 6 is connected and fixed to the upper joint 1 through threads; the pressure transmission sleeve 7 is connected and fixed to the connecting pipe 6 through threads; the sealing pipe 8 is connected and fixed to the pressure transmission sleeve 7 through threads; the ball valve outer tube 9 is connected and fixed to the pressure transmission sleeve 7 through threads; the upper ball seat 12 is connected and fixed to the sealing pipe 8 through threads; the left end of the spacer sleeve 10 is inserted into the pressure transmission sleeve 7, and the right end is inserted into the upper ball seat 12 and fixed in the middle position between the pressure transmission sleeve and the upper ball seat, and a cavity is formed between the spacer sleeve 10 and the sealing pipe 8 for passing liquid (see Figure 3C); the piston 11 is sleeved on the spacer sleeve 10 and inserted into the ball valve outer tube 9 at the same time, and can move left and right here; the rack sleeve 13 is sleeved on the upper ball seat 12, and is connected and fixed to the piston 11 by threads, so it can move synchronously with the piston; one of the sealing seats 14 is inserted into the upper ball seat 12, and the other is inserted into the lower ball seat 15; the valve ball 20 is installed between the two sealing seats 14, and the sealing seat and the valve ball are in contact with the same spherical surface; the lower ball seat 15 is inserted into the lower joint 16, and the spring 17 is installed in the lower ball seat 15. At the same time, the lower joint 16 is connected and fixed to the ball valve outer tube 9 by threads. At this time, the spring 17 has a certain compression stroke, and at the same time pushes the lower ball seat 15 to move to the left so that the contact surface of the sealing seat 14 and the valve ball 20 have a certain contact stress, ensuring that the sealing performance of the valve ball 20 is reliable when it is closed; the gear 19 passes through the boss thereon (see Figure 2 G) into the groove on the valve ball 20 (see Figure 2 H), while the teeth on the gear (see Figure 2 I) and the upper teeth of the rack sleeve 13 (see Figure 2 K); the gear pressing cap 18 is inserted into the gear 19 and connected and fixed to the valve ball 20 through threads, and the gear position is fixed to prevent the gear from moving. Since two symmetrical gear rack mechanisms are set, both sides of the valve ball and the inner side of the rack sleeve are flat (see Figure 2 L and M), so when the rack moves left and right, the valve ball can only rotate around the rotation axis J (see Figure 2 J) rotates, when it rotates counterclockwise 90 degrees, the channel is closed, and when it rotates clockwise 90 degrees again, the channel returns to the open state; the protective sleeve 3 is outside the connecting pipe 6 and is connected and fixed to the pressure transmission sleeve 7 through a thread; it is sleeved on the upper joint 1 and is connected and fixed to the protective sleeve 3 through a thread; one end of the pressure transmission pipe A4 is connected to the pressure transmission sleeve 7 and is firmly welded by argon arc welding, and the other end is led out to the wellhead after passing through the transition sleeve 2; one end of the pressure transmission pipe B5 is connected to the pressure transmission sleeve 7 and is firmly welded by argon arc welding, and the other end is led out to the wellhead after passing through the transition sleeve 2.

[0015] 3. Working principle: The tool has the function of closing and opening the oil pipe channel on the ground, and can meet the functions of testing under the oil pipe or wireline tools and replacing the wellhead oil pipe valve.

[0016] (I) Tool lowering: The tool is connected to the oil pipe and the lower part of the first oil pipe is hung down into the well. During the lowering process, the pressure transmission pipes A and B are led out to the ground.

[0017] (II) Closing the channel: After the tool is lowered into the well, when the channel needs to be closed, the high-pressure outlet of the surface pressure device is connected to the pressure transmission pipe A and pressure is applied. At this time, the high-pressure liquid is transmitted to the left side of the piston 11 through the pressure transmission pipe, pushing the piston to the right. Since the rack sleeve 13 and the piston 11 are fixedly connected by threads, the rack sleeve 13 and the piston 11 move synchronously. At this time, the rack sleeve 13 will cause the gear to rotate around the J axis (see Figure 2 J) rotates counterclockwise, when O and P touch (see Figure 3 O and P) to rotate the valve ball 20 exactly 90 degrees to close the channel, and at the same time seal the high-pressure fluid in the lower part of the valve ball 20. After the pressure is released from the upper part of the valve ball 20, the test tools or wire tools can be lowered, the valve can be replaced, and other construction operations can be carried out, thus avoiding the danger of climbing or killing the well to erect a test blowout preventer, etc., thereby improving the operation efficiency and saving the operation cost.

[0018] (III) Opening the channel: When the channel needs to be opened, connect the high-pressure outlet of the ground pressure device to the pressure transmission pipe B and pressurize it. At this time, the high-pressure liquid is transmitted to the pressure transmission pipe through the pressure transmission pipe. Figure 3 The cavity at C is transmitted to F through D, pushing the piston to move to the left. Since the rack sleeve 13 and the piston 11 are fixedly connected by threads, the rack sleeve 13 and the piston 11 move synchronously. At this time, the rack sleeve 13 will make the gear rotate around the J axis (see Figure 2 J) is rotated clockwise, and when the piston 11 returns to the position shown in the figure, the valve ball 20 is rotated 90 degrees to open the channel. Then the test tool or wire tool can be put into the test operation normally, and the valve replacement well can be produced normally. Therefore, the tool has the advantages of simple operation, safety and reliability, and thus has a good application prospect.

[0019] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A dual-channel hydraulically controlled downhole test blowout preventer, characterized in that: It includes a connecting pipe, an upper joint sleeved outside the connecting pipe and threadedly connected to the connecting pipe, a pressure transmission sleeve sleeved outside the connecting pipe and threadedly connected to the connecting pipe, a sealing pipe inserted into the pressure transmission sleeve and threadedly connected to the pressure transmission sleeve, a ball valve outer cylinder sleeved outside the pressure transmission sleeve and threadedly connected to the pressure transmission sleeve, an upper ball seat sleeved outside the sealing pipe and threadedly connected to the sealing pipe, a spacer sleeved outside the sealing pipe and having one end inserted into the pressure transmission sleeve and the other end inserted into the upper ball seat, and a cavity for passing liquid is formed between the sealing pipe and the spacer sleeve; The piston is sleeved outside the spacer sleeve and inserted into the outer tube of the ball valve. The piston moves left and right in the cavity between the pressure transmission sleeve and the upper ball seat; the rack sleeve is connected to the outer surface of the upper ball seat, and the rack sleeve is threaded with the piston and moves synchronously with the piston; the first sealing seat is inserted into the upper ball seat, and the second sealing seat is inserted into the lower ball seat. The valve ball meshed with the rack sleeve is installed between the two sealing seats, and the sealing seat and the valve ball are both in spherical contact; the lower ball seat is connected to the outer surface of the lower ball seat, and a spring is provided between the lower ball seat and the lower joint. The spring is used to push the lower ball seat to move so that the contact surface between the sealing seat and the valve ball has a certain contact stress, so that the valve ball is sealed when closed; the lower joint is threaded with the outer tube of the ball valve; A transition sleeve is arranged outside the upper joint, the transition sleeve is connected to the protective sleeve, the protective sleeve is connected to the pressure transmission sleeve, a first pressure transmission pipe is arranged in the upper cavity between the protective sleeve and the connecting pipe, one end of the first pressure transmission pipe is connected to the pressure transmission sleeve and welded by argon arc welding, and the other end passes through the transition sleeve and is led out to the wellhead; a second pressure transmission pipe is arranged in the lower cavity between the protective sleeve and the connecting pipe, one end of the second pressure transmission pipe is connected to the pressure transmission sleeve and welded by argon arc welding, and the other end passes through the transition sleeve and is led out to the wellhead.

2. A dual-channel hydraulically controlled downhole test blowout preventer as claimed in claim 1, characterized in that: The gear surface is provided with a boss, and the boss has a mounting hole arranged coaxially with the gear. The valve ball is provided with a channel running through its interior. Two opposing planes are also provided on the valve ball surface, and a groove is provided on the plane for plugging and matching with the boss of the gear. A positioning connecting column is provided in the groove for plugging and matching with the mounting hole on the boss.

3. A dual-channel hydraulically controlled downhole test blowout preventer as claimed in claim 1, characterized in that: The rack sleeve comprises a sleeve, a first rack arm and a second rack arm connected to the sleeve and arranged opposite to each other. Both rack arms are provided with racks arranged along the length direction of the rack arms for meshing with the gear transmission.

4. A dual-channel hydraulically controlled downhole test blowout preventer as claimed in claim 3, characterized in that: The valve ball is installed between the first rack arm and the second rack arm of the rack sleeve. Two opposite planes on the valve ball, one is opposite to the first rack arm, and the other is opposite to the second rack arm.

5. A dual-channel hydraulically controlled downhole test blowout preventer as claimed in claim 1, characterized in that: A gear pressing cap is inserted on the gear of the gear to prevent the gear from moving.

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