Anti-friction centralizer having anti-balling and boosted propelling functions

A centralizer and anti-mud technology, which is applied in the direction of drill pipe, casing, drill pipe, etc., can solve the problems of high resistance and difficulty in moving the drill bit forward, improve the quality of the well wall, facilitate running in and out, The effect of easy disassembly and assembly

Active Publication Date: 2017-09-05
DAQING DANNUO PETROLEUM TECH DEV
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AI Technical Summary

Problems solved by technology

[0003] In the horizontal section of extended-reach drilling, because the drilling tool lies on the well wall, the resistance to rotation and forward drilling is very large, it is difficult to push the drill bit forward horizontally, and it cannot be pressurized by the drill collar in a vertical well drill bit

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  • Anti-friction centralizer having anti-balling and boosted propelling functions
  • Anti-friction centralizer having anti-balling and boosted propelling functions
  • Anti-friction centralizer having anti-balling and boosted propelling functions

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Referring to the accompanying drawings, the anti-friction centralizer with the functions of mud bag prevention and pressurized propulsion proposed by the present invention is composed of a body 1 and a roller assembly. The front and rear ends of the body 1 are connected between downhole drilling tools through threaded buckles. There are evenly distributed ridges on the outer surface of the cylinder of 1, and each ridge is processed with a gap for installing the roller assembly; the roller assembly consists of a roller 2, an alloy tooth a3, a nut 4, and a bolt shaft 5 , oil deflector ring 6, outer wear-resistant sleeve 7, inner wear-resistant sleeve 8 and O-ring 11, first assemble the inner wear-resistant sleeve 8, outer wear-resistant sleeve 7 and roller 2 in sequence, Then install an oil deflector ring 6 in the stepped holes at both ends of th...

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Abstract

The invention relates to an anti-friction centralizer having anti-balling and boosted propelling functions. The anti-friction centralizer comprises a body and roller assemblies, wherein the body is connected between underhole tools through threads, and the roller assemblies are arranged on prisms which are uniformly distributed outside the body along the circumferential direction; a certain included angle exists between the roller shaft of each roller assembly and the axial direction of the body; the body rotates in the drilling process, and the rollers spirally roll on a well wall to push an underhole tool to move forward and supply drilling pressure to a drill bit; alloy teeth are embedded to the outer surfaces of the rollers and positions, provided with the roller assemblies, of the body, so that the friction mode is changed into rolling friction, friction resistance of the underhole drill with the well wall in the drilling process can be reduced, and failure of roller balling can be prevented. The anti-friction centralizer has a relatively simple structure, low cost, high strength and long service life, and can be used for solving the technical problems of poor resistance reduction effect, complicated structure, low strength and short service life in the prior art.

Description

technical field [0001] The invention relates to a downhole tool used for oil drilling, in particular to an anti-friction centralizer with the functions of anti-balling and pressurized propulsion. Background technique [0002] In the drilling operations of horizontal extended reach wells, directional wells and conventional wells in oil and gas fields, due to the gravity and the complex interaction between the drill bit and the formation, the drill string is prone to deflection or easy to lie on the well wall, making it difficult to center , seriously affecting the drilling quality. The centralization accuracy of the conventional drill string centralizer is not high, and it has limited effect on improving the centering degree of the drill string. The conventional rigid centralizer is also very seriously worn when working in the downhole, and the circumferential resistance is very large. In order to control and adjust the wellbore deviation during the drilling process, a large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/10E21B4/18
CPCE21B4/18E21B17/1057E21B17/1085
Inventor 田家林朱志李居瑞杨毅林晓月张堂佳
Owner DAQING DANNUO PETROLEUM TECH DEV
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