Open spiral wing anti-mud bag centralizer for drilling

Abstract

The invention discloses an open type spiral wing mud drum-preventing centralizer for well drilling. The open type spiral wing mud drum-preventing centralizer for well drilling comprises a tubular centralizer body (21), wherein at least one spiral centralizing wing (31) is arranged on the outer wall of the middle section of the centralizer body (21); a mud block cutting belt (32) extending along the spiral centralizing wing (31) is arranged on one side of the spiral centralizing wing (31); and the mud block cutting belt (32) and the centralizer body (21) maintain preset distance. The mud block cutting belt is arranged on one side of the spiral centralizing wing, so after mud blocks scraped from the wall of the well by the spiral centralizing wing gather to a certain degree, the state that the mud blocks continue to form a large mud drum can be changed under the action of the mud block cutting belt and can be changed into the state of a relatively thin and long strip; after more and more mud blocks are accumulated, the mud blocks are pushed to the lower part of the mud block cutting belt, so that the mud blocks are washed away by high-speed liquid and mud drums of the centralizer are prevented.

Description

technical field [0001] The invention belongs to the technical field of drilling in oil and gas fields, in particular to an open spiral wing anti-mud bag centralizer for drilling. Background technique [0002] At present, in the prior art, the commonly used centralizers in the drilling process include straight wing centralizers and spiral centralizer wing centralizers, and conventional centralizers lack the anti-balling design. When drilling a large section of viscous mudstone or tripping through a shrinking mudstone section, the complicated situation of mud bag of the centralizer often occurs. During the drilling process, if the centralizer is bagged, the annular flow channel will become smaller, and serious back pressure problems may occur when drilling into new formations, resulting in distortion of the ground pressure on bit, poor annular pressure in the downhole, and slow drilling speed. Serious downhole problems such as , lame formation and even stuck pipe. If mud bal...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to avoid the deficiencies in the prior art and provide an open spiral wing anti-balling centralizer for drilling to solve the problem of mud balling of the centralizer

Images