Pulsed jet rock debris washing tool

Abstract

The invention relates to a pulsed jet rock debris washing tool and belongs to the technical field of auxiliary equipment for drilling. The pulsed jet rock debris washing tool is composed of an upper joint, a housing, a central pipe and a lower joint; the upper joint is installed at one end of the housing by screw threads; the lower joint is installed at the other end of the housing by screw threads; the central pipe is movably installed inside the housing by virtue of a left bearing and a right bearing; the head of one end of the central pipe is in leaning connection with the upper joint and correspondingly communicates with the upper joint; the head of the other end of the central pipe is in leaning connection with the lower joint and correspondingly communicates with the lower joint; thepart, between the left bearing and the right bearing, of the central pipe is provided with at least two flow guide holes; the flow guide holes communicate with a central hole of the central pipe; thecircumference of the housing is provided with a plurality of jet flow holes corresponding to the flow guide holes; and the flow guide holes intermittently communicate with the jet flow holes. The washing tool can be used for cleaning a rock debris bed so as to prevent deposition of rock debris, and also enhances the turbulence degree of drilling fluid around the washing tool so that the fluid generates a better rock taking effect, thereby preventing the risk of blocking of a drilling bit due to deposition of too much rock debris.

Description

technical field [0001] The invention relates to a pulse jet cuttings cleaning tool, which belongs to the technical field of drilling auxiliary equipment. Background technique [0002] In the oil drilling process of complex structure wells such as extended-reach horizontal wells and multi-branch wells, rocks are drilled by the drill bit to form cuttings that accumulate in the wellbore annulus and are continuously carried to the surface by circulating drilling fluid. However, due to the influence of gravity, viscous resistance, impact force and other forces, it is very easy to generate cuttings beds. If the thickness of the sedimentary cuttings bed in the well is too high, it will cause a series of serious downhole problems, such as the inability to effectively transmit the drilling weight and the downhole Increased frictional resistance and torque of the drill tool assembly, slow ROP, and serious obstructions during tripping and tripping will cause problems such as drill stic...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a reasonable structure and easy to use to solve the problem of unsatisfactory cleaning effect of the existing cuttings bed cleaning tool due to structural reasons, and the easy accumulation of cuttings will cause the stuck drill to affect the normal cleaning work. Pulse jet cuttings cleaning tool for efficiency and other issues

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