Hydraulic power system shared by main tongs and back-up tongs

Abstract

The invention discloses a hydraulic power system shared by a main tong and a back-up tong. The hydraulic power system comprises a multi-way reversing valve assembly, a back-up tong clamping hydraulic oil cylinder and a main tong hydraulic motor. The multi-way reversing valve assembly comprises a hydraulic oil inlet pipe, a hydraulic oil return pipe, a switching valve, a three-position six-way reversing valve I and a three-position six-way reversing valve III, and the back-up tong clamping hydraulic oil cylinder is connected with a first working oil port A and a second working oil port B of the three-position six-way reversing valve I through a first connecting pipe module. A hydraulic oil pipeline of the main tong hydraulic motor is connected with a first working oil port A and a second working oil port B of the three-position six-way reversing valve III; hydraulic control of a back-up tong clamping hydraulic oil cylinder, a main tong safety door hydraulic driving module and a main tong hydraulic motor is integrated, automatic operation is completed, the safety door is clamped and closed firstly, then screwing-on and screwing-off are conducted, safety and reliability are achieved, and omission caused by manual control is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power tongs, and in particular to a hydraulic power system shared by a main tong and a backup tong. Background Art

[0002] Power tongs are special tools for loading and unloading drill pipes, sucker rods, and oil pipes in oil system drilling and downhole operations. The backup tongs can be used in conjunction with the main tongs. At present, the backup tongs can clamp the pipeline through the clamping cylinder, but the backup tongs clamping cylinder and the main tongs hydraulic control switching still rely on manual operation, which has a low degree of intelligence, and manual operation has great safety risks and is prone to operational errors. Summary of the invention

[0003] The object of the present invention is to provide a hydraulic power system shared by a main tong and a backup tong in view of the deficiencies of the prior art.

[0004] The technical solution of the present invention to solve the above problem is: a hydraulic power system shared by the main tongs and the backup tongs, including a multi-way reversing valve assembly, a backup tong clamping hydraulic cylinder, and a main tong hydraulic motor;

[0005] The multi-way reversing valve assembly includes a hydraulic oil inlet pipe, a hydraulic oil return pipe, a switching valve, a three-position six-way reversing valve I, and a three-position six-way reversing valve III;

[0006] The three-position six-way reversing valve includes an intermediate oil inlet E, an intermediate oil outlet F, a first working oil port A, a second working oil port B, an oil return port T and an overflow port N. The intermediate oil inlet E and the intermediate oil outlet F are connected to form an intermediate channel; the oil return port T is connected to the hydraulic oil return pipe through an oil return branch pipe, and the overflow port N is connected to the overflow main pipe through an overflow branch pipe, and the overflow main pipe is connected to the hydraulic oil return pipe;

[0007] The middle channels of the three-position six-way directional valve I and the three-position six-way directional valve III are connected through a switching valve, the middle oil inlet E of the three-position six-way directional valve I is connected to the hydraulic oil inlet pipe, and the middle oil outlet F of the three-position six-way directional valve III is connected to the hydraulic oil return pipe;

[0008] The switching valve includes a switching inlet, a first switching outlet, and a second switching outlet. The switching inlet is connected to the middle oil outlet F of the three-position six-way reversing valve I through a pipeline, the first switching outlet is connected to the middle oil inlet E of the three-position six-way reversing valve III through a pipeline, and the second switching outlet is connected to the hydraulic oil return pipe through a pipeline;

[0009] The back-up clamp clamping hydraulic cylinder is connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve I through the first connecting pipe module; the first connecting pipe module includes a first connecting oil pipe, a second connecting oil pipe, a first overflow valve group and a first detection module. The two hydraulic oil ports of the back-up clamp clamping hydraulic cylinder are respectively connected to the first working oil port A and the second working oil port B through the first connecting oil pipe and the second connecting oil pipe. The first overflow valve group includes a plurality of first overflow pipes. The two ends of the first overflow pipe are respectively connected to the first connecting oil pipe and the second connecting oil pipe. Each first overflow pipe is respectively provided with a second overflow valve. The first detection module includes four flow sensors, namely flow sensor I, flow sensor II, flow sensor III and flow sensor IV. The flow sensor I and flow sensor II are arranged on the first connecting oil pipe and are respectively located at the two ends of the connection of the first overflow pipe. The flow sensor III and flow sensor IV are arranged on the second connecting oil pipe and are respectively located at the two ends of the connection of the first overflow pipe.

[0010] The hydraulic oil pipeline of the main clamp hydraulic motor is connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve III;

[0011] The flow sensor I, the flow sensor II, the flow sensor III, the flow sensor IV, the three-position six-way reversing valve I, the three-position six-way reversing valve III and the switching valve are respectively connected to the controller.

[0012] Furthermore, it also includes a main clamp safety door hydraulic drive module and a three-position six-way reversing valve II;

[0013] The three-position six-way reversing valve II is connected between the three-position six-way reversing valve I and the switching valve, the intermediate channels of the three-position six-way reversing valve I and the three-position six-way reversing valve II are connected through the first pipeline, the intermediate channels of the three-position six-way reversing valve II and the three-position six-way reversing valve III are connected through the switching valve, the switching inlet of the switching valve is connected to the intermediate oil outlet F of the three-position six-way reversing valve II through a pipeline, and the first switching outlet is connected to the intermediate oil inlet E of the three-position six-way reversing valve III through a pipeline;

[0014] The main clamp safety door hydraulic drive module includes two safety door hydraulic cylinders, and the two safety door hydraulic cylinders are connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve II through the second connecting pipe module; the second connecting pipe module includes a third connecting oil pipe, a fourth connecting oil pipe, a second overflow pipe and a second detection module, the third connecting oil pipe and the fourth connecting oil pipe are respectively connected to the first working oil port A and the second working oil port B, the two hydraulic oil ports of the two safety door hydraulic cylinders are connected in parallel to the third connecting oil pipe and the fourth connecting oil pipe, the two ends of the second overflow pipe are respectively connected to the third connecting oil pipe and the fourth connecting oil pipe, and the second overflow pipe is provided with a third overflow valve, the second detection module includes four flow sensors, namely flow sensor V, flow sensor VI, flow sensor VII, and flow sensor VIII, the flow sensor V and the flow sensor VI are arranged on the third connecting oil pipe, and are respectively located at the two ends of the connection of the second overflow pipe, the flow sensor VII and the flow sensor VIII are arranged on the fourth connecting oil pipe, and are respectively located at the two ends of the connection of the second overflow pipe;

[0015] The flow sensor V, the flow sensor VI, the flow sensor VII, the flow sensor VIII, and the three-position six-way reversing valve II are respectively connected to the controller.

[0016] Furthermore, when making up and breaking up the buckle, the following steps are included:

[0017] In the first step, the controller synchronously controls the three-position six-way reversing valve I and the three-position six-way reversing valve II to clamp the back clamp hydraulic cylinder and close the safety door. The controller controls the second switching outlet of the switching valve to open and the first switching outlet to close. When the clamping operation is completed, the controller obtains the first safety signal; after the safety door is closed, the controller obtains the second safety signal;

[0018] In the second step, after the controller obtains the first safety signal and the second safety signal, the controller controls the second switching outlet of the switching valve to close and the first switching outlet to open, and synchronously controls the three-position six-way reversing valve III to start the main clamp hydraulic motor to rotate forward or reverse, and perform make-up and break-out operations respectively.

[0019] Furthermore, the method for obtaining the first safety signal is that after the clamping operation is completed, the hydraulic oil pressure in the pipeline increases, and the first overflow pipe overflows. At this time, the detection values ​​of the flow sensor III and the flow sensor IV are inconsistent.

[0020] Furthermore, the second safety signal is obtained in that after the safety door is closed, the hydraulic oil pressure in the pipeline increases, and the second overflow pipe overflows. At this time, the detection values ​​of the flow sensor VII and the flow sensor VIII are inconsistent.

[0021] Furthermore, in the second step, the controller controls the safety door to remain statically closed, and controls the dynamic and continuous clamping of the back-up clamp hydraulic cylinder.

[0022] The present invention has the beneficial effects:

[0023] The present invention provides a hydraulic power system shared by a main tong and a backup tong, which integrates the hydraulic control of the backup tong clamping hydraulic cylinder, the main tong safety door hydraulic drive module and the main tong hydraulic motor to complete automated operations, first clamping and closing the safety door, and then making and breaking the buckle, which is safe and reliable and avoids omissions caused by manual control. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a three-position six-way directional valve;

[0026] Figure 3 It is a structural diagram of the back-up clamp clamping hydraulic cylinder;

[0027] Figure 4 A schematic diagram of the structure of the main tongs safety door hydraulic drive module and the main tongs hydraulic motor;

[0028] In the figure: 1-back clamp clamping hydraulic cylinder, 2-main clamp hydraulic motor, 3-safety door hydraulic cylinder, 4-hydraulic oil inlet pipe, 5-hydraulic oil return pipe, 6-three-position six-way reversing valve I, 7-three-position six-way reversing valve II, 8-three-position six-way reversing valve III, 9-switching valve, 10-first pipeline, 11-return oil branch pipe, 12-overflow branch pipe, 13-overflow main pipe, 14-check valve, 15-first overflow valve, 16-first connecting oil pipe, 17-second connecting oil pipe, 18-first overflow pipe, 19-second overflow valve, 20-flow sensor I, 21-flow sensor II, 22-flow sensor III, 23-flow sensor IV, 24-third connecting oil pipe, 25-fourth connecting oil pipe, 26-second overflow pipe, 27-third overflow valve, 28-flow sensor V, 29-flow sensor VI, 30-flow sensor VII, 31-flow sensor VIII. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0030] As shown in the figure, a main tongs and backup tongs share a hydraulic power system, including a multi-way reversing valve assembly, a backup tongs clamping hydraulic cylinder, a main tongs safety door hydraulic drive module and a main tongs hydraulic motor.

[0031] The multi-way reversing valve assembly includes a hydraulic oil inlet pipe, a hydraulic oil return pipe, three three-position six-way reversing valves and a switching valve, which are respectively a three-position six-way reversing valve I, a three-position six-way reversing valve II, and a three-position six-way reversing valve III; the three-position six-way reversing valve includes an intermediate oil inlet E, an intermediate oil outlet F, a first working oil port A, a second working oil port B, an oil return port T and an overflow port N.

[0032] The middle oil inlet E and the middle oil outlet F are connected to form an intermediate channel, the middle channels of the three-position six-way reversing valve I and the three-position six-way reversing valve II are connected through the first pipeline, the middle channels of the three-position six-way reversing valve II and the three-position six-way reversing valve III are connected through the switching valve, the middle oil inlet E of the three-position six-way reversing valve I is connected to the hydraulic oil inlet pipe, the middle oil outlet F of the three-position six-way reversing valve III is connected to the hydraulic oil return pipe, the oil return ports T of the three three-position six-way reversing valves are connected to the hydraulic oil return pipe through the return oil branch pipes, the overflow ports N of the three three-position six-way reversing valves are connected to the overflow main pipe through the overflow branch pipes, the overflow main pipe is connected to the hydraulic oil return pipe, each overflow branch pipe is provided with a one-way valve, and the overflow main pipe is provided with a first overflow valve.

[0033] The switching valve includes a switching inlet, a first switching outlet and a second switching outlet. The switching inlet is connected to the middle oil outlet F of the three-position six-way reversing valve II through a pipeline, the first switching outlet is connected to the middle oil inlet E of the three-position six-way reversing valve III through a pipeline, and the second switching outlet is connected to the hydraulic oil return pipe through a pipeline.

[0034] The three-position six-way directional valve I, the three-position six-way directional valve II, the three-position six-way directional valve III and the switching valve are connected to the controller respectively. The three-position six-way directional valve I, the three-position six-way directional valve II and the three-position six-way directional valve III are of model DODL*-F15L, which can be electrically controlled and pneumatically switched.

[0035] The back-up clamp clamping hydraulic cylinder is connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve I through the first connecting pipe module. The first connecting pipe module includes a first connecting oil pipe, a second connecting oil pipe, a first overflow valve group and a first detection module. The two hydraulic oil ports of the back-up clamp clamping hydraulic cylinder are respectively connected to the first working oil port A and the second working oil port B through the first connecting oil pipe and the second connecting oil pipe. The first overflow valve group includes a plurality of first overflow pipes. The two ends of the first overflow pipe are respectively connected to the first connecting oil pipe and the second connecting oil pipe. Each first overflow pipe is respectively provided with a second overflow valve. The first detection module includes four flow sensors, namely flow sensor I, flow sensor II, flow sensor III and flow sensor IV. The flow sensor I and flow sensor II are arranged on the first connecting oil pipe and are respectively located at the two ends of the connection of the first overflow pipe. The flow sensor III and flow sensor IV are arranged on the second connecting oil pipe and are respectively located at the two ends of the connection of the first overflow pipe.

[0036] The main clamp safety door hydraulic drive module includes two safety door hydraulic cylinders, and the two safety door hydraulic cylinders are connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve II through the second connecting pipe module. The second connecting pipe module includes a third connecting oil pipe, a fourth connecting oil pipe, a second overflow pipe and a second detection module. The third connecting oil pipe and the fourth connecting oil pipe are respectively connected to the first working oil port A and the second working oil port B. The two hydraulic oil ports of the two safety door hydraulic cylinders are connected in parallel to the third connecting oil pipe and the fourth connecting oil pipe. The two ends of the second overflow pipe are respectively connected to the third connecting oil pipe and the fourth connecting oil pipe. The second overflow pipe is provided with a third overflow valve. The second detection module includes four flow sensors, namely flow sensor V, flow sensor VI, flow sensor VII and flow sensor VIII. Flow sensor V and flow sensor VI are arranged on the third connecting oil pipe and are respectively located at the two ends of the connection of the second overflow pipe. The flow sensor VII and flow sensor VIII are arranged on the fourth connecting oil pipe and are respectively located at the two ends of the connection of the second overflow pipe.

[0037] The hydraulic oil pipeline of the main tongs hydraulic motor is connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve III.

[0038] The flow sensor I, the flow sensor II, the flow sensor III, the flow sensor IV, the flow sensor V, the flow sensor VI, the flow sensor VII, and the flow sensor VIII are connected to the controller respectively.

[0039] When this system is making and breaking the buckle, in the first step, the controller synchronously controls the three-position six-way reversing valve I and the three-position six-way reversing valve II to clamp the back clamp hydraulic cylinder and close the safety door. The controller controls the second switching outlet of the switching valve to open and the first switching outlet to close. When the clamp clamp hydraulic cylinder is clamped, the working hydraulic oil of the three-position six-way reversing valve I enters from the second working oil port B and returns from the first working oil port A (the detection values ​​of flow sensor I, flow sensor II, flow sensor III, and flow sensor IV are consistent. If they are inconsistent, hydraulic oil leakage may occur, and an early warning is carried out for investigation). When the clamping operation is completed After that, the hydraulic oil pressure in the pipeline increases, and the first overflow pipe overflows. At this time, the detection values ​​of flow sensor III and flow sensor IV are inconsistent, that is, the controller obtains the first safety signal; when the safety door is closed, the working hydraulic oil of the three-position six-way reversing valve II enters from the second working oil port B and returns from the first working oil port A (the detection values ​​of flow sensor V, flow sensor VI, flow sensor VII, and flow sensor VIII are consistent). After the safety door is closed, the hydraulic oil pressure in the pipeline increases, and the second overflow pipe overflows. At this time, the detection values ​​of flow sensor VII and flow sensor VIII are inconsistent, that is, the controller obtains the second safety signal. In the second step, after the controller obtains the first safety signal and the second safety signal, the controller controls the second switching outlet of the switching valve to close and the first switching outlet to open, synchronously controls the three-position six-way reversing valve III, starts the main clamp hydraulic motor to rotate forward or reverse, and performs the buckling and unbuckling operations respectively.

[0040] In one of the real-time methods, in the second step, the controller controls the first working oil port A and the second working oil port B of the three-position six-way reversing valve II to be closed, the safety door remains statically closed, and the three-position six-way reversing valve II is controlled to continuously clamp the back-up clamp clamping hydraulic cylinder. The hydraulic oil enters from the second working oil port B and returns from the first working oil port A. Most of the hydraulic oil directly passes through the first overflow pipe to ensure dynamic and continuous clamping of the back-up clamp.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A hydraulic power system shared by the main tongs and backup tongs, characterized in that: It includes a multi-way reversing valve assembly, a back-up clamping hydraulic cylinder, and a main clamp hydraulic motor; The multi-way reversing valve assembly includes a hydraulic oil inlet pipe, a hydraulic oil return pipe, a switching valve, a three-position six-way reversing valve I, and a three-position six-way reversing valve III; The three-position six-way reversing valve includes an intermediate oil inlet E, an intermediate oil outlet F, a first working oil port A, a second working oil port B, an oil return port T and an overflow port N. The intermediate oil inlet E and the intermediate oil outlet F are connected to form an intermediate channel; the oil return port T is connected to the hydraulic oil return pipe through an oil return branch pipe, and the overflow port N is connected to the overflow main pipe through an overflow branch pipe, and the overflow main pipe is connected to the hydraulic oil return pipe; The middle channels of the three-position six-way directional valve I and the three-position six-way directional valve III are connected through a switching valve, the middle oil inlet E of the three-position six-way directional valve I is connected to the hydraulic oil inlet pipe, and the middle oil outlet F of the three-position six-way directional valve III is connected to the hydraulic oil return pipe; The switching valve includes a switching inlet, a first switching outlet, and a second switching outlet. The switching inlet is connected to the middle oil outlet F of the three-position six-way reversing valve I through a pipeline, the first switching outlet is connected to the middle oil inlet E of the three-position six-way reversing valve III through a pipeline, and the second switching outlet is connected to the hydraulic oil return pipe through a pipeline; The back-up clamp clamping hydraulic cylinder is connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve I through the first connecting pipe module; the first connecting pipe module includes a first connecting oil pipe, a second connecting oil pipe, a first overflow valve group and a first detection module. The two hydraulic oil ports of the back-up clamp clamping hydraulic cylinder are respectively connected to the first working oil port A and the second working oil port B through the first connecting oil pipe and the second connecting oil pipe. The first overflow valve group includes a plurality of first overflow pipes. The two ends of the first overflow pipe are respectively connected to the first connecting oil pipe and the second connecting oil pipe. Each first overflow pipe is respectively provided with a second overflow valve. The first detection module includes four flow sensors, namely flow sensor I, flow sensor II, flow sensor III and flow sensor IV. The flow sensor I and flow sensor II are arranged on the first connecting oil pipe and are respectively located at the two ends of the connection of the first overflow pipe. The flow sensor III and flow sensor IV are arranged on the second connecting oil pipe and are respectively located at the two ends of the connection of the first overflow pipe. The hydraulic oil pipeline of the main clamp hydraulic motor is connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve III; The flow sensor I, the flow sensor II, the flow sensor III, the flow sensor IV, the three-position six-way reversing valve I, the three-position six-way reversing valve III and the switching valve are respectively connected to the controller.

2. A hydraulic power system shared by a main tong and a backup tong as claimed in claim 1, characterized in that: It also includes the main clamp safety door hydraulic drive module and three-position six-way reversing valve II; The three-position six-way reversing valve II is connected between the three-position six-way reversing valve I and the switching valve, the intermediate channels of the three-position six-way reversing valve I and the three-position six-way reversing valve II are connected through the first pipeline, the intermediate channels of the three-position six-way reversing valve II and the three-position six-way reversing valve III are connected through the switching valve, the switching inlet of the switching valve is connected to the intermediate oil outlet F of the three-position six-way reversing valve II through a pipeline, and the first switching outlet is connected to the intermediate oil inlet E of the three-position six-way reversing valve III through a pipeline; The main clamp safety door hydraulic drive module includes two safety door hydraulic cylinders, and the two safety door hydraulic cylinders are connected to the first working oil port A and the second working oil port B of the three-position six-way reversing valve II through the second connecting pipe module; the second connecting pipe module includes a third connecting oil pipe, a fourth connecting oil pipe, a second overflow pipe and a second detection module, the third connecting oil pipe and the fourth connecting oil pipe are respectively connected to the first working oil port A and the second working oil port B, the two hydraulic oil ports of the two safety door hydraulic cylinders are connected in parallel to the third connecting oil pipe and the fourth connecting oil pipe, the two ends of the second overflow pipe are respectively connected to the third connecting oil pipe and the fourth connecting oil pipe, and the second overflow pipe is provided with a third overflow valve, the second detection module includes four flow sensors, namely flow sensor V, flow sensor VI, flow sensor VII, and flow sensor VIII, the flow sensor V and the flow sensor VI are arranged on the third connecting oil pipe, and are respectively located at the two ends of the connection of the second overflow pipe, the flow sensor VII and the flow sensor VIII are arranged on the fourth connecting oil pipe, and are respectively located at the two ends of the connection of the second overflow pipe; The flow sensor V, the flow sensor VI, the flow sensor VII, the flow sensor VIII, and the three-position six-way reversing valve II are respectively connected to the controller.

3. A hydraulic power system shared by a main tong and a backup tong as claimed in claim 2, characterized in that: When making and breaking the buckle, The following steps are involved: In the first step, the controller synchronously controls the three-position six-way reversing valve I and the three-position six-way reversing valve II to clamp the back clamp hydraulic cylinder and close the safety door. The controller controls the second switching outlet of the switching valve to open and the first switching outlet to close. When the clamping operation is completed, the controller obtains the first safety signal; after the safety door is closed, the controller obtains the second safety signal; In the second step, after the controller obtains the first safety signal and the second safety signal, the controller controls the second switching outlet of the switching valve to close and the first switching outlet to open, and synchronously controls the three-position six-way reversing valve III to start the main clamp hydraulic motor to rotate forward or reverse, and perform make-up and break-out operations respectively.

4. A hydraulic power system for main tongs and backup tongs as claimed in claim 3, characterized in that: The method for obtaining the first safety signal is that after the clamping operation is completed, the hydraulic oil pressure in the pipeline increases, and the first overflow pipe overflows. At this time, the detection values ​​of the flow sensor III and the flow sensor IV are inconsistent.

5. A hydraulic power system shared by a main tong and a backup tong as claimed in claim 3, characterized in that: The method for obtaining the second safety signal is that after the safety door is closed, the hydraulic oil pressure in the pipeline increases, and the second overflow pipe overflows. At this time, the detection values ​​of flow sensor VII and flow sensor VIII are inconsistent.

6. A hydraulic power system shared by a main tong and a backup tong as claimed in claim 3, characterized in that: In the second step, the controller controls the safety door to remain statically closed and controls the dynamic continuous clamping of the back-up clamp hydraulic cylinder.

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