Rotating wheel driving type pulse generator

Abstract

The invention relates to a rotating wheel driving type pulse generator. The rotating wheel driving type pulse generator comprises a hollow tubular shell, wherein a drainage block, a throttling controlmechanism and a throttling block are sequentially arranged in the shell from top to bottom; a throttling hole is formed in the throttling block; the drainage block is used for changing the flowing direction of drilling fluid; and the drilling fluid acts on the throttling control mechanism after flowing through the drainage block, so that the throttling control mechanism does up-and-down reciprocating motion, then the drilling fluid exits from or enters the throttling hole in a reciprocating mode, the flow area of the drilling fluid is changed, and periodic pressure pulse fluctuation is generated. According to the rotating wheel driving type pulse generator, the drilling fluid is used for driving an impact rotating wheel with fan blades to rotate, a throttling rod is driven to do up-and-down reciprocating motion, so that the periodic change of the flow area of the throttling block is realized, then periodic pressure pulses are generated, the pressure pulses are upwards transmitted andact on an oscillation short section of a hydraulic oscillator, the oscillation short section is driven to vibrate periodically at high frequency, and then the effect of relieving the directional supporting pressure is achieved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling, in particular to a wheel-driven pulse generator. Background technique [0002] With the deepening of exploration and development, there are more and more wells with complex structures such as directional wells and horizontal wells. The problems of low WOB transmission efficiency and unstable tool door lead to low overall orientation efficiency and low ROP. [0003] At present, the hydraulic oscillator is one of the most effective tools for alleviating directional backpressure. The hydraulic oscillator is mainly composed of a pulse generator and an oscillating subsection. Drilling fluid flows through the pulse generator to generate periodic pressure pulses, and the pressure pulses act on the oscillating sub to drive the oscillating sub to generate periodic high-frequency vibrations. [0004] At present, the pulse generator commonly used in hydraulic oscillators is mainly screw type...

AI Technical Summary

Problems solved by technology

[0004] At present, the pulse generator commonly used in hydraulic oscillators is mainly screw type, which is composed of stator, rotor, moving disc valve, fixed valve disc, etc. In actual work, since the stator is composed of rubber, its life is short in high temperature and oil-based environments. Seriously affect the applicability of the hydraulic oscillator

In addition, the contact surfaces of the movable disc valve and the fixed disc valve are severely worn during long-term high-speed rotation, which restricts the effective working life of the tool

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