Anti-hand-twisting control system and method for hydraulic tongs

Abstract

The invention discloses an anti-wring control system and method for hydraulic tongs, and relates to the technical field of well drilling and downhole operation. The system comprises: a two-position three-way stroke valve installed beside a hydraulic clamp valve; a gas inlet of the three-position four-way gas-liquid reversing valve is connected with a port A of the two-position three-way stroke valve; a port P of the three-position four-way gas-liquid reversing valve is connected with an oil inlet pipeline, and a port T of the three-position four-way gas-liquid reversing valve is connected with an oil return pipeline; a P port of the manual three-position four-way reversing valve of the hydraulic clamp is connected with an A port of the three-position four-way gas-liquid reversing valve, a T port is connected with an oil return pipeline, the A port is connected with a main clamp motor of the hydraulic clamp, and a B port is connected with a back-up clamp oil cylinder of the hydraulic clamp. The safety protection device is suitable for various vehicle types such as well drilling and workover, the safety protection requirement of the hydraulic tongs when a tubular column is lifted and lowered in the well drilling and workover operation can be effectively met, the occurrence of hand twisting prevention accidents is fundamentally eradicated, and the construction process is safer and more efficient.

Description

Technical Field

[0001] This invention relates to the field of drilling and downhole operations technology, specifically to a hydraulic tongs anti-entanglement control system and method. Background Technology

[0002] In domestic oilfields, hydraulic tubing tongs, commonly used during tubing tripping operations, are crucial for attaching and disconnecting tubing strings during well workover. These tongs feature a mechanical anti-entrapment interlock device at the tong jaws to reduce the risk of hand entrapment during operation. This design aims to prevent operators from accidentally inserting their hands into the hydraulic tongs while opening / closing safety doors or repairing the tongs, thus avoiding hand injuries due to misoperation. However, currently used anti-entrapment devices frequently experience mechanical failures in practical applications. The main challenge lies in the fact that these mechanical anti-entrapment devices rely solely on external control and fail to effectively disconnect the power system, making them prone to interlocking and significantly increasing the risk of production safety accidents. Summary of the Invention

[0003] The purpose of this invention is to provide a hydraulic clamp anti-snagging control system and method, which improves the safety and reliability of hydraulic clamp operation by using pneumatic-hydraulic technology without changing the hydraulic clamp structure and operating valve.

[0004] To achieve the above objectives, the technical solution of this application is: a hydraulic clamp anti-snagging control system, comprising:

[0005] A two-position three-way stroke valve is installed next to the hydraulic clamp valve;

[0006] The three-position four-way pneumatic-hydraulic directional valve has its air inlet connected to the A port of a two-position three-way stroke valve; the P port of the three-position four-way pneumatic-hydraulic directional valve is connected to the oil inlet line, and the T port is connected to the oil return line.

[0007] The hydraulic clamp manual three-position four-way directional valve has its P port connected to the A port of the three-position four-way pneumatic-hydraulic directional valve, its T port connected to the return oil line, its A port connected to the main clamp motor of the hydraulic clamp, and its B port connected to the back clamp cylinder of the hydraulic clamp.

[0008] In one embodiment, the P port of the two-position three-way valve is connected to the gas circuit of the workover rig via a gas pipeline.

[0009] In one embodiment, an oil-water separator is provided between the two-position three-way valve and the workover rig's gas path.

[0010] In one embodiment, an overflow valve is installed between the inlet line and the return line.

[0011] In one embodiment, the three-position four-way gas-liquid reversing valve is an M-type valve or an O-type valve.

[0012] In one embodiment, port B of the three-position four-way gas-liquid reversing valve is blocked.

[0013] In one embodiment, the oil inlet line and the oil return line are connected to the main oil circuit of the workover rig.

[0014] The present invention also provides a hydraulic clamp anti-tangling control method, which realizes the clamping and untangling operation and the hydraulic clamp safety protection operation based on a two-position three-way stroke valve and a three-position four-way pneumatic-hydraulic directional valve.

[0015] In one embodiment, the method for implementing the upper and lower buckle operation is as follows: when the hydraulic clamp valve is in the closed state, the two-position three-way stroke valve is activated to connect the air circuit, and the three-position four-way air-hydraulic directional valve is activated to connect its P port and A port. At this time, the hydraulic clamp oil circuit is connected. By operating the hydraulic clamp manual three-position four-way directional valve, the hydraulic clamp main clamp motor and the hydraulic clamp back clamp cylinder are controlled to work, thereby realizing the upper and lower buckle operation.

[0016] In one embodiment, the hydraulic clamp safety protection operation is achieved as follows: when the hydraulic clamp valve is in the open state, the two-position three-way stroke valve is activated to disconnect the air circuit, and the three-position four-way air-hydraulic directional valve loses the external force of the air circuit, its valve core returns to the neutral position, and the oil inlet line and oil return line are connected; at this time, if the hydraulic clamp manual three-position four-way directional valve is operated, due to the loss of power, the hydraulic clamp main clamp motor and the hydraulic clamp back clamp cylinder stop working, thus achieving the purpose of hydraulic clamp safety protection.

[0017] Due to the adoption of the above technical solutions, this invention achieves the following technical effects: It features a simple structure, low cost, safety, reliability, and significant effectiveness, winning widespread recognition from on-site construction and technical personnel. Applicable to various vehicle types, including drilling and well workover operations, it effectively meets the safety protection requirements of hydraulic clamps during the running-in and running-out of tubing in drilling and well workover operations, fundamentally eliminating the occurrence of hand-locking accidents and making the construction process safer and more efficient. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a hydraulic clamp anti-snagging control system.

[0020] The numbers in the diagram are explained as follows: 1. Air line; 2. Two-position three-way stroke valve; 3. Three-position four-way air-hydraulic directional valve; 4. Hydraulic clamp manual three-position four-way directional valve; 5. Hydraulic clamp main clamp motor; 6. Hydraulic clamp back clamp cylinder; 7. Return oil line; 8. Inlet oil line; 9. Relief valve. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly specified. "Several" means one or more, unless otherwise expressly specified.

[0024] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Example 1

[0027] Please see Figure 1 This embodiment provides a hydraulic clamp anti-snagging control system, which can fundamentally solve the problem of injury during the operation of hydraulic clamps, making the construction process safer and more efficient; specifically including:

[0028] Gas line 1, one end of which is connected to port P of a two-position three-way valve, and the other end of which is connected to the gas line of the workover rig;

[0029] The two-position three-way stroke valve 2 is installed near the hydraulic clamp valve. The A port of the two-position three-way stroke valve is connected to the air inlet of the three-position four-way pneumatic-hydraulic reversing valve 3 through another air pipeline.

[0030] The three-position four-way pneumatic-hydraulic directional valve 3 has its port A connected to the port P of the hydraulic clamp manual three-position four-way directional valve, and its port B is blocked.

[0031] The hydraulic clamp manual three-position four-way directional valve 4 has its T port connected to the return oil line 7; the A port and B port of the hydraulic clamp manual three-position four-way directional valve 4 are respectively connected to the hydraulic clamp main clamp motor 5 and the hydraulic clamp back clamp cylinder 6.

[0032] Oil inlet line 8, one end of which is connected to the main oil circuit of the workover rig, and the other end is connected to port P of the three-position four-way gas-liquid reversing valve;

[0033] The return oil line 7 has one end connected to the main oil circuit of the workover rig and the other end connected to the T port of the three-position four-way gas-liquid reversing valve.

[0034] As a preferred embodiment provided in this example, an oil-water separator can be installed on the gas line connecting the gas line 1 and the equipment to prevent freezing and blockage during winter use.

[0035] As a preferred embodiment provided in this example, there is an overflow valve 9 between the oil inlet line 8 and the oil return line 7.

[0036] As a preferred embodiment provided in this example, the three-position four-way gas-liquid reversing valve 3 adopts an M-type valve or an O-type valve, or a two-position three-way gas-liquid valve can be used instead.

[0037] The advantage of this implementation method is that, without changing the original structure and operating valve design of the hydraulic clamp, the safety and reliability of the hydraulic clamp operation are improved by using pneumatic-hydraulic technology.

[0038] Example 2

[0039] This embodiment provides a hydraulic clamp anti-tangling control method, which is based on the two-position three-way stroke valve and the three-position four-way pneumatic-hydraulic directional valve in the control system of Embodiment 1 to realize the buckle-on and unhooking operation and the hydraulic clamp safety protection operation.

[0040] During use, if the hydraulic clamp valve is closed, the two-position three-way stroke valve 2 will activate to connect the air circuit, and the three-position four-way air-hydraulic directional valve 3 will activate, connecting the P port and A port of the three-position four-way air-hydraulic directional valve 3. At this time, the hydraulic clamp oil circuit will be connected. By operating the hydraulic clamp manual three-position four-way directional valve 4, the hydraulic clamp main clamp motor 5 and the hydraulic clamp back clamp cylinder 6 can be controlled to work, realizing the upper and lower clamping operations.

[0041] During use, if the hydraulic clamp valve is open, the valve core in the two-position three-way stroke valve 2 disconnects port P from port A under the action of the spring, thus cutting off the air circuit. The three-position four-way pneumatic-hydraulic directional valve 3 loses the external force of the air circuit, and the valve core returns to the neutral position under the spring thrust, connecting the oil inlet line 8 and the oil return line 7. At this time, if the hydraulic clamp manual three-position four-way directional valve 4 is operated again, the hydraulic clamp main clamp motor 5 and the hydraulic clamp back clamp cylinder 6 will stop working due to the loss of power, thus achieving the purpose of safety protection for the hydraulic clamp.

[0042] The advantage of this implementation is that the hydraulic clamp's oil circuit is cut off or opened by the hydraulic clamp's valve switch, effectively controlling the operation of the hydraulic clamp.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A hydraulic clamp anti-snagging control system, characterized in that, include: A two-position three-way stroke valve is installed next to the hydraulic clamp valve; The three-position four-way pneumatic-hydraulic directional valve has its air inlet connected to the A port of a two-position three-way stroke valve; the P port of the three-position four-way pneumatic-hydraulic directional valve is connected to the oil inlet line, and the T port is connected to the oil return line. The hydraulic clamp manual three-position four-way directional valve has its P port connected to the A port of the three-position four-way pneumatic-hydraulic directional valve, its T port connected to the return oil line, its A port connected to the main clamp motor of the hydraulic clamp, and its B port connected to the back clamp cylinder of the hydraulic clamp.

2. The hydraulic clamp anti-entanglement control system according to claim 1, characterized in that, The P port of the two-position three-way valve is connected to the gas circuit of the workover rig via a gas pipeline.

3. The hydraulic clamp anti-entanglement control system according to claim 2, characterized in that, An oil-water separator is installed between the two-position three-way valve and the gas line of the workover rig.

4. The hydraulic clamp anti-entanglement control system according to claim 1, characterized in that, An overflow valve is installed between the oil inlet pipeline and the oil return pipeline.

5. The hydraulic clamp anti-entanglement control system according to claim 1, characterized in that, The three-position four-way gas-liquid reversing valve is either an M-type valve or an O-type valve.

6. The hydraulic clamp anti-entanglement control system according to claim 1, characterized in that, The B port of the three-position four-way gas-liquid reversing valve is blocked.

7. The hydraulic clamp anti-entanglement control system according to claim 1, characterized in that, The oil inlet pipeline and oil return pipeline are connected to the main oil circuit of the workover rig.

8. A method for controlling the anti-entanglement of hydraulic clamps, characterized in that, The two-position three-way stroke valve and the three-position four-way pneumatic-hydraulic directional valve are used to realize the operation of unhooking and the safety protection operation of hydraulic clamps.

9. The hydraulic clamp anti-entanglement control method according to claim 8, characterized in that, The operation of attaching and detaching the clamp is as follows: When the hydraulic clamp valve is closed, the two-position three-way stroke valve is activated to connect the air circuit, and the three-position four-way air-hydraulic directional valve is activated to connect its P port and A port. At this time, the hydraulic clamp oil circuit is connected. By operating the hydraulic clamp manual three-position four-way directional valve, the hydraulic clamp main clamp motor and the hydraulic clamp back clamp cylinder are controlled to work, thereby realizing the attachment and detachment operation.

10. The hydraulic clamp anti-entanglement control method according to claim 8, characterized in that, The safety protection operation of the hydraulic clamp is achieved as follows: When the hydraulic clamp valve is in the open state, the two-position three-way stroke valve is activated to disconnect the air circuit. The three-position four-way air-hydraulic directional valve loses the external force of the air circuit, and its valve core returns to the neutral position, connecting the oil inlet and return lines. At this time, if the hydraulic clamp manual three-position four-way directional valve is operated, the hydraulic clamp main clamp motor and the hydraulic clamp back clamp cylinder will stop working due to the loss of power, thus achieving the purpose of hydraulic clamp safety protection.

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