Hydraulic oscillator based on roller and impeller

Abstract

The invention discloses an oscillator with drag reduction and increased speed and belongs to the fields of oil drilling and the like. According to the technical scheme, an upper joint, an outer shellbody and a lower joint are connected through screw threads in a threaded mode in sequence; a throttle valve plate and the upper joint are connected through screw threads in a threaded mode; the throttle valve plate and cylindrical pins are connected through a locking screw, the cylindrical pins are located between an impeller and the throttle valve plate; an impeller shaft, the impeller and an impeller shell are welded into a whole, series bearings are installed between the impeller shell and the outer shell body, the upper end and the lower end of the series bearings are positioned through aninner sleeve and an outer sleeve, and the lower end of the impeller shell makes contact with the upper end of an roller; and the roller is connected and fixed to a supporting cylinder through a thread, the supporting cylinder is connected with the outer shell body through a flat key to achieve the circumferential positioning, and the lower end of the supporting cylinder abuts against the lower joint to realize the axial positioning. According to the hydraulic oscillator based on the roller and the impeller, a rubber structure design is excluded from the inner part of the hydraulic oscillatorbased on the roller and the impeller, the structure is simple, the friction between lower drill tools and a borehole wall of a horizontal well and a large displacement well can be effectively reduced,the drilling pressure transmission capacity is enhanced, the drilling efficiency is improved, and meanwhile, downhole accidents of sticking and clamping and the like 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 reducing drag and increasing speed. Background technique [0002] In recent years, with the continuous development of my country's industry, the demand and exploitation of oil and natural gas are also increasing. However, in order to alleviate the shortage of oil resources in our country, people began to exploit oil in areas with severe environmental conditions such as deep wells and ultra-deep wells. The exploitation of new oil and gas wells makes drilling engineering more complex. In order to meet the needs of new drilling conditions or new oil and gas resources (such as coalbed methane, shale gas, offshore oil and gas, etc.), corresponding new drilling methods and tools are also constantly being developed. In horizontal wells and extended-reach wells, with the increase of w...

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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 wellhead drilling pressure to be effectively transmitted to the drill bit, the low rock-carrying ability of drilling fluid and the use effect of existing axial vibration tools Unsatisfactory problem, design a new type of pulse oscillator

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