Screw type negative pressure pulsed hydroscillator

Abstract

The invention discloses a hydroscillator which is used in petroleum drilling and other fields and has a cuttings discharging function. According to the technical scheme, an upper connector, a stator casing, a universal shaft casing, a bearing supporting sub and a lower connector are sequentially in threaded connection; a power assembly comprises the upper connector, a rotor compressing cap, a screw rotor, a rubber stator and the stator casing; the screw rotor, a universal shaft and a transmission shaft are sequentially in threaded connection; a valve assembly comprises a flow passing transmission shaft, a cam system, a spray nozzle, a spring system and the lower connector, the flow passing transmission shaft and a cam bushing are in threaded connection, a cam is fixed on the cam bushing through screws, and a valve element is matched with the lower connector through a key groove; the cam system converts rotation motion of a screw motor into axial motion of the valve element, and opening and closing of a valve are realized. With the adoption of the hydroscillator, friction resistance between a drilling tool at the lower part of a horizontal well or a large-displacement well and the well wall can be reduced effectively, the cuttings bringing capacity of a drilling fluid can be improved, the drilling efficiency is improved, and downhole accidents such as sticking can be avoided.

Description

technical field [0001] The invention belongs to a novel downhole tool in the field of petroleum and natural gas drilling engineering, in particular to a novel hydraulic oscillator with the function of promoting debris removal. Background technique [0002] The exploitation of new oil and gas wells makes drilling engineering more complex. In order to meet the needs of new drilling conditions (such as ultra-deep wells) or new oil and gas resources (such as coalbed methane, shale gas, offshore oil and gas, etc.), corresponding new drilling methods and tools Also evolving. During the development of these new drilling technologies, increasing the rate of penetration, reducing borehole wall friction, and increasing the borehole target diameter are important basic issues that need to be solved. Among the methods to solve these problems, downhole tools that work mechanically use drilling fluid to achieve energy conversion and generate certain expected vibrations, which have develop...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of large drilling friction in existing horizontal wells and extended-reach wells, the inability of the drilling pressure at the wellhead to be effectively transmitted to the drill bit, the low rock-carrying capacity of the drilling fluid and the use effect of the existing axial vibration tools Unsatisfactory problem, design a new screw type negative pressure pulse hydraulic oscillator

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