Negative pressure pulse oscillator

Abstract

The invention discloses an oscillator which is used in the field of petroleum drilling and is capable of promoting cutting bringing of drilling fluid. According to the technical scheme, an upper connector, an impeller shell, a bearing shell, a nozzle shell and a lower connector are in threaded connection in sequence; an impeller and an impeller mandrel are positioned through a flat key and a locking cap; the impeller mandrel, a water cap and a valve core tube are in threaded connection in sequence; torque generated by the impeller impacted by drilling fluid is conducted to the valve core tube through the impeller mandrel and the water cap, and then the valve core tube is driven to rotate. A radial through hole is formed in the nozzle shell, fluid inside the tube is communicated and cut off from the outside when the valve core tube is rotated, pressure fluctuation of the fluid inside a tube column is achieved through internal and external pressure differences of the tube column, and a drilling column is vibrated. By adopting the oscillator, the friction resistance of a drill rig at the lower part of a horizontal well or a large displacement well to a well wall is effectively reduced, the cutting carrying property of the drilling fluid is improved, the drilling efficiency is improved, and under-well accidents such as drilling blocking 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] 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 complicated. 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. During the development of these new drilling technologies, increasing the ...

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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 type of negative pressure pulse oscillator

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