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Enclosed screw wing anti-mud bag centralizer for drilling

A centralizer and closed technology, which is applied to drilling equipment, drill pipes, drill pipes, etc., can solve problems such as mud bagging of the centralizer, and achieve the effects of preventing mud bagging of the centralizer, simple structure and low investment cost.

Inactive Publication Date: 2015-11-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 a kind of closed spiral wing anti-balling centralizer for drilling to solve the problem of mud balling of the centralizer

Method used

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  • Enclosed screw wing anti-mud bag centralizer for drilling

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Embodiment Construction

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. And the features in the embodiments can be combined with each other.

[0019] The core of the present invention is to provide a closed spiral wing anti-balling centralizer for drilling to solve the problem of mud balling of the centralizer.

[0020] Such as figure 1 As shown, the enclosed spiral wing anti-balling centralizer for drilling in the present invention includes a tubular centralizer body 21, the upper end of the centralizer body 21 is a threaded box 11, and the lower end of the centralizer body 21 is a threaded male. Button 12, threaded female button 11 and threaded male button 12 are used to connect with other parts of the drilling tool. At least one spiral centralizing wing 32 is provided on the outer wall of t...

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Abstract

The invention discloses a closed spiral wing anti-balling centralizer for well drilling. The closed spiral wing anti-balling centralizer for well drilling comprises a tubular centralizer body (21), at least one spiral centralizer wing (32) is arranged on the outer wall of the middle section of the centralizer body (21), a coaxial closed barrel (31) is arranged in the middle section of the centralizer body (21), the external diameter of the closed barrel (31) is smaller than that of each spiral centralizer wing (32), the closed barrel (31) and the centralizer body (21) form an annular space, and a clod discharge chute (33) communicated with the annular space is formed in the outer wall of the closed barrel (31). Owing to the structure of the closed barrel and the clod discharge chute, clod can enter the annular space formed by the closed barrel and the centralizer body through the clod discharge chute and then is taken away by high-speed fluids passing the annular space when the clod scraped from the wall of a well by the centralizer wings is gathered to a certain extent, and balling of the centralizer is prevented.

Description

technical field [0001] The invention belongs to the technical field of drilling in oil and gas fields, in particular to a closed 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 ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/10
Inventor 鹿传世张勇黄凯文王小勇李磊熊永卫张超梁继文徐一龙吴江曾春珉许发宾张崇黄亮余意
Owner CHINA NAT OFFSHORE OIL CORP
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