Negative pressure pulse oscillating tool

Abstract

The invention discloses a negative pressure pulse oscillating tool which is integrally composed of four parts: an oscillating part, a power part, a transmission part and a rotating part. An upper joint is connected to an outer barrel of a spline through a thread, a plurality of reset disc springs are arranged in an oscillating short section, and a piston is in threaded connection to the oscillating short section to be sealed with a cylinder; a screw stator and a screw rotor provide power to the whole tool; a winding shaft is separately connected to the screw rotor and a water cap, and a bearing shaft connected to the water cap through a flat key forms the transmission part with a hard alloy bearing pack and a serial bearing pack; a movable valve rotates relative to a fixed valve and formsthe rotating part; a fluid enters into the tool through an inner runner of the upper joint, and is discharged from the tool from a bypass nozzle and the inner runner of a lower joint. The negative pressure pulse oscillating tool has the characteristics of being high in oscillating amplitude and capable of adjusting the pressure pulse, so that problems that a wear-reducing and resistance-reducing tool in the prior art is complex in structure, not obvious in wear-reducing and resistance-reducing effect and the like are solved, the drilling efficiency is improved and the drilling time is shortened.

Description

technical field [0001] The invention belongs to the technical field of downhole tools for oil and natural gas drilling engineering, and relates to a negative pressure pulse that can effectively reduce friction, transmit drilling pressure, and improve drilling speed and production efficiency in the production of complex structure wells such as extended-reach wells and long horizontal wells. Oscillating tool. Background technique [0002] In the oil and gas industry, with the gradual development of the application of highly deviated wells and horizontal wells in drilling engineering, especially the drilling depth of the horizontal section continues to increase. The friction between the drill string and the drill string and the well wall or the inner wall of the casing is increasing, which seriously affects the drilling speed, and sometimes causes the string to bend or even lock. In order to solve the above problems, many companies at home and abroad have successively develope...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a negative pressure pulse oscillating tool, which has the characteristics of high vibration amplitude and adjustable pressure pulse, and solves the

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