Device for driving shear valve to generate pulse pressure waves by utilizing liquid power and method thereof

Abstract

The invention discloses a device for driving a shear valve to generate pulse pressure waves by utilizing liquid power and a method thereof. An elastic reset device is used for giving an initial position to a plane swing valve rotor, a fixed original angle is formed between the planar swing valve rotor and a planar swing valve stator, when a signal needs to be transmitted, the position of an electromagnet is changed through current, the electromagnet directly drives a pilot control mechanism to move, a runner for communicating high-pressure hydraulic oil with a main piston is opened, the main piston is driven to make contact with the high-pressure fluid, under the action of the high-pressure fluid, the main piston generates longitudinal movement (in the axis direction of a drill column), under the action of a thread transmission conversion device, the longitudinal movement of the main piston is converted into rotary movement, the rotor is further driven to rotate, and the purpose of transmitting pressure waves is achieved.

Description

technical field [0001] The invention relates to a device and a method for generating pulsed pressure waves by using liquid power to drive a shear valve, and belongs to the technical field of drilling auxiliary equipment. Background technique [0002] At present, when drilling for oil exploration, it is generally necessary to carry out measurement while drilling, so as to understand the well site data in real time, so as to improve guidance and on-site decision-making for subsequent drilling. Logging while drilling instruments have become an essential part of drilling operations. Current LWD instruments generally adopt a modular design, and each sub has an independent function. The shear valve mud pulser is also an independent sub. The valve plate cuts the fluid in the drill string downhole and utilizes the fluid The water hammer effect causes pressure pulsation in the mud. [0003] Since the shear valve pulsator always works under high temperature and high pressure conditio...

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Problems solved by technology

[0003] Since the shear valve pulsator always works under high temperature and high pressure conditions underground, its working environment is very harsh and requires high performance. The current shear valve pulsator is driven by a motor. For example, Chinese patent CN104481518A discloses an oscillating The shear valve pulse generator is driven by a motor, but the motor is easily damaged when working in high-temperature, high-pressure mud. For this, Chinese patent CN106014396A discloses a dynamic seal and pressure compensation device for a shear valve pulser , it uses dynamic seals to achieve the sealing protection of the motor, which not only leads to very complicated results, but also the sealing effect will decrease after the dynamic seal is used for a long time, and the heat of the motor running is difficult to get rid of, which will cause damage to the motor

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