Self-lubricating sleeve type spiral centralizer

Abstract

The invention relates to a self-lubricating sleeve type spiral centralizer, comprising a centralizer body. The periphery of the centralizer body is provided with an inner ring body which protrudes outwards along a radial direction. The diameters of the inner ring body are gradually reduced towards directions of two ends along an axial direction. The periphery of the inner ring body is sleeved with a sleeve which can rotate relative to the inner ring body. The inner surface of the sleeve is adapted to the peripheral surface of the inner ring body, and a clearance space is formed between the inner surface of the sleeve and the peripheral surface of the inner ring body. The sleeve of the self-lubricating sleeve type spiral centralizer is separated from the inner ring body on the centralizer body, and the sleeve and the inner ring body form clearance fit, and a contact surface is lined with a composite material or the contact surface is processed by a special technology, so a structure similar to a self-lubricating spherical plain bearing is formed between the sleeve and the centralizer body. The spiral centralizer has technical performance and operating characteristics of self-lubricating and self-aligning.

Description

technical field [0001] The invention relates to the technical field of geological drilling, in particular to a self-lubricating sleeve type spiral centralizer. Background technique [0002] The spiral centralizer is a rigid full-hole drilling tool stabilizer. The bottom hole assembly formed by assembling a certain number of spiral centralizers at the proper position of the drill string can not only prevent the well deviation when drilling vertical wells, but also control the wellbore trajectory when drilling directional wells. It can also make the drill string centered, ensure the accuracy of the inclination measurement data, and improve the stability of the drill bit. [0003] In the prior art helical centralizer, several helical belts are installed on the effective centralizing section of a cylindrical steel body according to a certain size, and then a plurality of diameter-gauge alloy blocks are inserted on the helical belt according to a certain arrangement rule. This s...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a self-lubricating sleeve-type screw centralizer with more reliable working performance and the ability to reduce the risk of pipe sticking, which solves the problems caused by the poor use effect and excessive vibration in the formation with high plasticity in the prior art. The failure of vertical drilling tools and logging while drilling tools

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