Multi-stage hydraulic pressurizer based on mechanical device

Abstract

The invention relates to a three-stage one-stroke hydraulic pressurizer applied to drilling of conventional wells, slim holes and micro-holes. The technical scheme of the three-stage one-stroke hydraulic pressurizer is that an upper joint, different stages of piston cylinders and a lower joint are connected sequentially through threads; the lower end of the upper joint of the hydraulic pressurizer is connected with a third-stage piston cylinder through threads; the third-stage piston cylinder and a second-stage piston cylinder are connected with a main piston cylinder; a third-stage piston, a second-stage piston and a main piston are mounted in the corresponding cylinder bodies respectively; the main piston cylinder and a main piston rod are flexibly connected through a roller mounted on the cylinder body and a keyway formed in the piston rod; the upper end of the main piston rod is connected with the main piston through threads, and the lower end of the main piston rod is fixed on the lower joint through threads. With adoption of the hydraulic pressurizer, mud power is converted into axial thrust, so that constant bit pressure is applied to a drill bit, the bit pressure transfer efficiency can be increased, the problems of bit jumping, backing pressure and the like are solved effectively, the service life of the drill bit is prolonged, fatigue failures of a drilling tool are reduced, and drilling efficiency is increased.

Description

technical field

[0001] The invention relates to a multi-stage hydraulic pressurizer based on a mechanical device used for drilling conventional boreholes, slim boreholes and tiny boreholes, and can be used for downhole operations in the process of oil and natural gas exploitation. Background technique

[0002] In oil and gas drilling operations, the way to apply WOB in conventional wellbore drilling is to rely on the gravity of the drill bit to apply WOB to the drill bit, and then realize the rock-breaking drilling of the drill bit. This traditional rigid pressure method has many unavoidable problems. The disadvantages of drilling, such as uneven feeding, jumping drill, bending of drilling tools, back pressure, etc., these disadvantages not only affect the ROP, but also cause rapid wear of the drill string and drill bit, seriously affecting the life of the drill bit and drilling tool.

[0003] However, slimhole and micro-hole drilling is an emerging high-efficiency, low-cost...

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