Efficient pressure testing tool for blowout preventer unit

Abstract

The utility model discloses an efficient pressure test tool for a blowout preventer group, which comprises a tie-back male head, one end of the tie-back male head is connected with a ball seat, the other end of the tie-back male head is movably connected with a tie-back female head, and the tie-back female head is sleeved with a variable-diameter outer sleeve and is connected with the variable-diameter outer sleeve; resin balls are arranged in the tie-back male head and the ball seat, and the spring compresses the resin balls on the inner conical surface of the ball seat. A through pressure relief hole is formed in the side wall of the tie-back male head. The tie-back male head and the ball seat are connected in a combined mode and installed on the tubing hanger / pressure test plug, the resin ball and the spring are arranged in the tie-back male head and the ball seat to form a one-way valve ball seat, and pressure from top to bottom can be isolated; and the tie-back female head and reducing jacket combination is connected to the lower part of the lifting oil pipe / drill rod and is used for tie-back of the tie-back male head. The tool is simple in structure and convenient to operate, a local sealing cavity is formed through tubing hanger / pressure test plug sealing, tool internal resin ball sealing and blowout preventer flashboard sealing, a pressing test is carried out, flashboard sealing performance is verified, operation safety is improved, and operation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the blowout preventer pressure test technical field during oil field workover operation, especially relates to a blowout preventer group high -efficient pressure test tool. BACKGROUND

[0002] In the marine oil production process, the operation safety control is relatively strict, the offshore operation well control safety is particularly important, and the quality of the blowout preventer directly determines whether the blowout or overflow accident can be effectively prevented. The blowout preventer needs to be pressure tested every fixed time before and during the workover operation to ensure the safety during the operation.

[0003] In the conventional workover operation on the sea, the order of the commonly used blowout preventer group from bottom to top is single gate, four-way, variable gate plate, shear gate plate and annular blowout preventer. Since the single gate blowout preventer is at the lower end of the drilling four-way, there is no fixed pressure transmission channel between the single gate and the oil jacket four-way, which causes pressure testing difficulty. The full seal / shear gate plate pressure testing can be performed from the drilling four-way, but the oil jacket four-way needs to be cast for pressure testing plug or cast for two-way back pressure valve on the tubing hanger. The decoupling and coupling need to be performed during the casting tool process, and the operation is complicated. At present, the blowout preventer pressure testing operation mode has certain difficulty, and the blowout preventer group cannot be efficiently tested at all levels, which affects the safety and efficiency of the subsequent operation. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of blowout preventer group high -efficient pressure test tools, which are simple in structure, convenient to operate, can efficiently and quickly test the pressure of blowout preventer gate during workover operation, and improve the safety and efficiency of operation.

[0005] The utility model is implemented by the following technical solutions.

[0006] A blowout preventer group high -efficient pressure test tool includes a back connection male head, one end of the back connection male head is connected with a ball seat, the other end is movably connected with a back connection female head, and the back connection female head is provided with a variable-diameter sleeve outside and is connected with the variable-diameter sleeve;Resin balls are arranged in the back connection male head and the ball seat;A spring presses the resin balls on the internal conical surface of the ball seat;A through pressure relief hole is formed in the sidewall of the back connection male head.

[0007] Further, a rotation-preventing block is arranged at the connection between the back connection male head and the ball seat, and a rotation-preventing screw is arranged on the rotation-preventing block.

[0008] Further, a rubber ring groove for placing a sealing ring is arranged at the connection between the back connection male head and the ball seat.

[0009] Further, a plurality of lifting ring mounting holes are formed in the outer wall of the ball seat.

[0010] Further, the lower part of the outer wall of the ball seat is formed with a clamping groove.

[0011] Further, the top end of the back-connection male head is semicircular, and a plurality of splines are arranged on the upper part of the outer wall of the back-connection male head; and a spline groove matched with the splines is formed on the end of the back-connection female head close to the back-connection male head.

[0012] Further, the depth of the spline groove is greater than the height of the spline.

[0013] Further, the side of the back-connection female head away from the back-connection male head is provided with a fixing pin hole for connecting with the variable-diameter outer sleeve.

[0014] The present application has the following beneficial effects.

[0015] The back-connection male head and the ball seat can be connected and combined, and a spring, a resin ball, an anti-rotation block and an anti-rotation pin are arranged between the back-connection male head and the ball seat; the spring presses the resin ball surface and the contact surface of the ball seat to ensure the sealing property; the anti-rotation block and the anti-rotation pin cooperate to form a fixing effect, and can prevent the back-connection male head and the ball seat from being separated during back-off; and the combination can be directly connected with a tubing hanger / pressure testing plug.

[0016] The back-connection female head and the variable-diameter outer sleeve can be combined into a whole through the fixing pin, and the combination can be directly connected with a riser / drill pipe and lowered from the drilling platform; the spline groove of the back-connection female head and the spline of the back-connection male head cooperate to complete back-connection; due to the sealing of the tubing hanger / pressure testing plug, the resin ball and the blowout preventer gate, a local sealed cavity is formed in the inner cavity of the back-connection male head and the ball seat, the pressure relief hole of the back-connection male head and the annular space of the blowout preventer, and full seal, shear, single gate and other blowout preventer pressure testing operations can be realized to verify the sealing property of the gate.

[0017] The tool can be used for blowout preventer gate pressure testing operation during and before well repair operation; before well repair operation, after the Christmas tree is removed, the back-connection male head and the ball seat combination is directly connected to the tubing hanger, and then the riser and the blowout preventer group are installed; at this time, the full seal / shear gate can be pressure tested, the drilling platform directly connects the back-connection female head and the variable-diameter outer sleeve combination to the lower part of the riser, lowers the pipe column, completes pipe column back-connection, performs single gate, annular and other blowout preventer pressure testing, and when the pressure testing is qualified, the blowout preventer group efficient pressure testing tool is all pulled out through the spline groove of the back-connection female head and the spline of the back-connection male head cooperation back-off, and subsequent well repair operation is performed; during well repair operation, the drilling platform directly assembles the blowout preventer group efficient pressure testing tool into a whole, connects the tubing hanger / pressure testing plug to the lowermost part, lowers the pipe column to the tubing head, performs annular, single gate and other pressure testing, and when the pressure testing is qualified, the back-connection male head and the variable-diameter outer sleeve are pulled out through back-off, the tubing hanger / pressure testing plug, the back-connection male head and the ball seat are left in the well, and then the shear / full seal gate is pressure tested, and finally the left well tool is pulled out.

[0018] In summary, the blowout preventer group high-efficiency pressure testing tool has simple structure, meets pressure testing requirements of full sealing / cutting, single gate and the like of the blowout preventer, guarantees reliability and safety of the blowout preventer, and improves operation safety. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the utility model;

[0020] Figure 2 is a sectional view of the utility model back connection male head and ball seat combination;

[0021] Figure 3 is a structural schematic view of the utility model back connection male head and ball seat combination;

[0022] Figure 4 is a structural schematic view of the utility model back connection female head;

[0023] Figure 5 is a sectional view of the utility model variable-diameter outer sleeve.

[0024] Among them, 1, back connection female head; 2, back connection male head; 3, ball seat; 4, variable-diameter outer sleeve; 5, tubing hanger; 6, lifting tubing; 11, fixed pin hole; 12, key groove; 21, spring; 22, resin ball; 23, pressure relief hole; 24, spline; 31, anti-rotation block; 32, lifting ring mounting hole; 33, tight slot; 34, rubber ring groove; 35, anti-rotation screw. DETAILED DESCRIPTION

[0025] The patent application is further described below in combination with embodiments.

[0026] As Figure 1 shown, a blowout preventer group high-efficiency pressure testing tool includes a back connection female head 1, a variable-diameter outer sleeve 4, a back connection male head 2 and a ball seat 3. The pressure testing tool is connected with a lifting tubing 6 at the upper part and connected with a tubing hanger 5 at the lower part.

[0027] As Figure 2 , 3 shown, the back connection male head 2 and the ball seat 3 can be connected and combined to form a single-flow valve, and there are a spring 21, a resin ball 22, an anti-rotation block 31 and an anti-rotation pin 35 between the two. The combination can be directly connected with a tubing hanger / pressure testing plug. The spring 21 compresses the resin ball 22 to make it compact with the upper tapered surface in the inner cavity of the ball seat 3, which can prevent liquid from passing through in one direction and ensure sealing. When there is pressure in the well, the spring 21 can be compressed to connect the upper and lower parts, and the pressure is released.

[0028] Anti-rotation block 31 is installed at the connection between the male connector 2 and the ball seat 3. Anti-rotation screw 35 is installed on the anti-rotation block 31. The anti-rotation block 31 and the anti-rotation pin 35 work together to form a fixing effect, preventing the male connector 2 and the ball seat 3 from separating during subsequent back-threading. The fastening groove 33 is two flat surfaces on the outer surface of the ball seat 3, providing a clamping position for pipe wrenches when the ball seat 3 is connected to the oil pipe hanger 5, making it convenient for personnel to fasten the pipe.

[0029] The pressure relief hole 23 can communicate with the inner cavity of the male connector 2, which can be used to verify the sealing performance of the resin ball by connecting a hand pump, and can also provide a pressure test channel for the blowout preventer and a pressure relief channel in the well. A lifting ring can be installed at the lifting ring mounting hole 32 to facilitate the hoisting and movement of the male connector 2 and the ball seat 3 assembly, reducing the risk of personnel handling.

[0030] like Figure 4 , 5 As shown, the reconnecting female head 1 and the reducing sleeve 4 can be assembled into one unit by installing a pin at the fixing pin hole 11, and the upper part is directly connected to the lifting oil pipe 6.

[0031] In this embodiment, as Figure 1 As shown, first assemble the male return connector 2 and ball seat 3 onto the tubing hanger 5, then install the riser and blowout preventer assembly. At this time, water can be injected into the blowout preventer through the drilling four-way valve in the blowout preventer assembly. The injected water enters the inner cavity of the male return connector 2 through the pressure relief hole 23. Due to the sealing properties of the resin ball 22, a closed cavity is formed between the inner cavity of the blowout preventer and the inner cavity of the male return connector 2. Pressurization is used to verify the sealing performance of the full seal / shear gate.

[0032] In this embodiment, after the full-seal / shear gate's sealing performance is verified as qualified, the lift pipe 6, reconnection connector 1, and reducer sleeve 4 are connected together on the drilling rig. The tubing string is then lowered to complete the reconnection, and pressure stabilization tests such as annular and semi-seal / single-gate tests are performed. After the pressure test is completed, the tubing string can be reversed to remove the entire blowout preventer assembly high-efficiency pressure testing tool for subsequent operations.

[0033] In this embodiment, as Figure 3 , 4 As shown, the top of the male connector 2 is semi-circular, making it easy for the female connector 1 to be inserted into the male connector 2 during reconnection, thus facilitating operation. The male connector 2 has three splines 24 arranged in a circle, and the female connector 1 has three keyways 12 arranged in a circle. During reconnection, the splines 24 are inserted into the keyways 12, thereby enabling the reconnection pipe string to have the functions of lowering and rotating. Furthermore, the retaining edge of the keyway 12 is higher than the splines 24, which can effectively prevent the tool from falling off when removing the blowout preventer assembly high-efficiency pressure testing tool assembly pipe string.

[0034] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A blowout preventer stack high efficiency pressure testing tool, characterized in that: The utility model provides a ball joint, which comprises a male joint (2), one end of the male joint (2) is connected with a ball seat (3), the other end of the male joint (2) is movably connected with a female joint (1), the female joint (1) is sleeved with a variable-diameter sleeve (4) and is connected with the variable-diameter sleeve (4); the male joint (2) and the ball seat (3) are internally provided with a resin ball (22), and a spring (21) is used to compress the resin ball (22) on the internal conical surface of the ball seat (3); a through pressure relief hole (23) is formed in the side wall of the male joint (2).

2. The high-efficiency pressure testing tool for blowout preventer stack of claim 1, wherein: A rotation-preventing block (31) is arranged at the connecting position of the male joint (2) and the ball seat (3), and a rotation-preventing screw (35) is arranged on the rotation-preventing block (31).

3. The high efficiency pressure testing tool for BOP stack of claim 1, wherein: A rubber ring groove (34) for placing a sealing ring is arranged at the connecting position of the male joint (2) and the ball seat (3).

4. The high efficiency pressure testing tool for BOP stack of claim 1, wherein: A plurality of lifting ring mounting holes (32) are formed in the outer wall of the ball seat (3).

5. The high efficiency pressure testing tool for BOP stack of claim 1, wherein: A fastening groove (33) is formed in the lower part of the outer wall of the ball seat (3).

6. The high efficiency pressure testing tool for BOP stack of claim 1, wherein: The top end of the male joint (2) is semicircular, a plurality of splines (24) are arranged on the upper part of the outer wall of the male joint (2), and a key groove (12) that is matched with the splines (24) in shape and position is formed on the end of the female joint (1) close to the male joint (2).

7. The high efficiency pressure testing tool for BOP stack of claim 6, wherein: The depth of the key groove (12) is greater than the height of the splines (24).

8. The high efficiency pressure testing tool for BOP stack of claim 1, wherein: A fixing pin hole (11) for connecting with the variable-diameter sleeve (4) is arranged on the side of the female joint (1) away from the male joint (2).

Images