Reverse-rotation preventing structure for screw drilling tool ground driving device for petroleum and natural gas exploitation

Abstract

The invention discloses a reverse-rotation preventing structure for a screw drilling tool ground driving device for petroleum and natural gas exploitation. The reverse-rotation preventing structure comprises a slurry pump. The inlet end of the slurry pump is connected with a first three-way joint, and other two connectors of the first three-way joint communicate with outlets of a slurry inlet pipeand an energy accumulator correspondingly, and the slurry inlet pipe and the connectors of the first three-way joint communicate through first one-way valves; the outlet end of the slurry pump is connected with a second three-way joint, and other two connectors of the second three-way joint communicate with a bypass valve and an energy accumulator slurry inlet pipe of a screw drilling tool correspondingly; and the outlet end of the energy accumulator slurry inlet pipe is connected with a third three-way joint, and other two connectors of the third three-way joint communicate with inlets of the energy accumulator and the energy accumulator slurry inlet pipe correspondingly. The reverse-rotation preventing structure enables the screw drilling tool ground driving device to rotate at a low speed, reverse-rotation potential energy applying to a rod column is slowly released, various damage to man-machine is avoided, and maintaining of on-site operators is facilitated.

Description

technical field [0001] The invention relates to the field of an anti-reversal device for a screw drilling tool, in particular to an anti-reversal structure for a surface drive device for a screw drilling tool used in oil and natural gas development. Background technique [0002] When screw drilling tools are used for oil and natural gas extraction, when the screw pump is stopped or the pump is stuck, the elastic deformation energy stored in the rod string will be released quickly, causing the rod string to reverse quickly. After shutting down, under the action of the hydraulic pressure difference between the fluid in the tubing and the external pipeline and the inner well of the casing, the screw pump will become a hydraulic motor, causing the rotor and the connected rod to reverse rapidly. The greater the pressure difference of the oil jacket, the faster the reverse speed of the rod column, and the longer the duration until the pressure difference of the oil jacket returns ...

AI Technical Summary

Problems solved by technology

[0010] (2) At low speed, the ratchet pawl will generate noise and wear due to contact

[0011] (3) The adjustment of the pressing force of the friction surface of the brake belt and the release of the reverse torque require manual close-range operation, and during the torque release process, the rod column will also reverse at a certain speed. If the operation is improper or the friction surface of the brake belt slips , will also pose a safety hazard to the operator

[0015] (1) Although the reverse rotation of the rod column is prevented, the reverse torque stored in the rod column driving device has not been released, so the problem of reverse rotation has not been solved during the process of moving the rod column

[0016] (2) It is inconvenient to replace and maintain, lubricating oil is required for daily management, and a crane is required for disassembly and replacement

[0017] (3) If the reverse torque is too large, the anti-reverse system will be stuck

It is inconvenient to replace and maintain, and equipment needs to be replaced, which poses a safety hazard

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