Torque-withstanding type double-acting releasing tool

Abstract

The invention provides a torque-withstanding type double-acting releasing tool. The torque-withstanding type double-acting releasing tool comprises an upper connector, a lower connector and a sliding sleeve, wherein a suspended step is arranged on the inner wall of the upper connector, the lower connector is sealed and arranged at the lower portion of the upper connector in a sleeving mode, the lower connector and the upper connector are fixed through first shear screws in a penetrating mode, the sliding sleeve is sealed and arranged in the upper connector and the lower connector in a penetrating mode, a step is arranged on the outer wall of the sliding sleeve in a protruding mode and is located above the suspended step, a sealing conical surface for clamping a steel ball is arranged on the inner wall of the sliding sleeve, the sliding sleeve is provided with overflow holes formed in the upper portion of the sealing conical surface, and the sliding sleeve and the lower connector are fixed through second shear screws in a penetrating mode. The torque-withstanding type double-acting releasing tool has mechanical and hydraulic releasing modes simultaneously and is simple in structure, high in reliability and good in internal pressure bearing capacity.

Description

technical field [0001] The invention relates to the technical field of oil wells, in particular to a hand-disposal tool, in particular to a torsion-bearing double-acting hand-disposable tool suitable for downhole fracturing, oil production and workover operations in oil wells. Background technique [0002] In the process of downhole fracturing, oil production, workover, and completion of oil wells, various types of hand-throwing tools are often used. The existing hand-throwing tools are divided into two types: mechanical and hydraulic. [0003] The main feature of the existing mechanical hand throwing tool is to use the method of rotating or lifting the pipe string to cut the scissors between the upper and lower joints of the hand throwing tool to complete the throwing action. The hand tool has large tensile force and internal pressure bearing capacity, but cannot bear the torque load, and has a complex structure and a small inner diameter. The inner diameter can be made la...

AI Technical Summary

Problems solved by technology

[0003] The main feature of the existing mechanical throwing tool is to use the method of rotating or lifting the pipe string to cut the shear nail between the upper and lower joints of the throwing tool to complete the hand throwing action; wherein the rotating pipe string is used to cut the shear nail and throw it away. The hand tool has a large capacity to bear tension and internal pressure, but cannot bear torque load, and has a complex structure and a small internal diameter; while a tool that uses a lifting pipe string to cut shear nails and throw it away, its structure is relatively simple. The internal diameter can be made larger, but the disadvantage is that the internal pressure bearing capacity of the pipe string is directly determined by the shearing force of the shear nails, so that the pipe string cannot withstand the internal pressure above 50MPa during operation. When fluctuating, it is easy to cause mishandling

[0004] The main feature of the existing hydraulic throwing tool is that the ball is thrown inside the pipe string, the sliding sleeve is set to seal, and then the pressure is suppressed in the pipe string, and the sliding sleeve turns on the throwing switch, so that the tool completes the throwing action and can withstand high pressure of 70MPa. Internal pressure, but its disadvantages are complex structure, high cost, difficult assembly, and the overall tensile force of the tool is not very large. During the construction process, the pressure and the speed control of the tool are high, which is easy to cause premature loss. Not very reliable

[0005] Moreover, the existing mechanical or hydraulic release methods all adopt a single release method. Once the release fails, you can only replace the release tool and re-enter the pipe string. The operation is cumbersome and the reliability is low.

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