RU2011776C1 - Spindle of face motor - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: invention deals with face motors for drilling of oil and gas wells. Spindle has body, shaft, rubber-and-metal axial support composed of discs and thrust bearing, radial bearings. Upper radial bearing consists of bushing put on shaft and bushing anchored in body. Elastic cylindrical member made of durable material with low friction coefficient is placed between bushings. Compression spring is vulcanized in elastic member. In upper part elastic member rests against disc anchored in body, in lower part elastic member rests against disc mounted on shaft. EFFECT: enhanced efficiency of motor. 2 cl, 2 dwg

Description

 The invention relates to drilling equipment, namely to downhole motors used for drilling oil and gas wells.

 Known downhole motor spindle, comprising a housing, a shaft, multi-row thrust rolling bearings, cages of which are based on elastic elements mounted with an interference fit in the axial direction [1].

 The elastic elements, compressing, form the bearing surfaces on all bearings of the axial support, increasing its load capacity, due to the uniform distribution of the load between the rows.

 The main drawback of the spindle is the design complexity. The presence of elastic elements lengthens the spindle of the downhole motor, which complicates the drilling, especially of directional wells.

 The prototype is a spindle, including a housing, a shaft, multi-row axial rubber-metal bearings, radial rubber-metal bearings [2].

 The main disadvantage of the spindle is the low reliability due to the high resistance of the axial bearings. When drilling wells with cone bits, significant dynamic loads lead to a beating of the shaft relative to the housing within the play, while the rubber elements of the thrust bearing collapse, and the disks break.

 The purpose of the invention is to increase the reliability of the spindle by ensuring constant preloading of the working surfaces of the disks and thrust bearings, axial bearings while maintaining linear dimensions.

 This goal is achieved by the fact that the upper radial support of the spindle is made in the form of two bushings and two disks and an elastic cylindrical element made of wear-resistant material with a low coefficient of friction with a compression spring vulcanized inside, with one sleeve and disk mounted on the shaft and the other sleeve and the disk is in the housing, the elastic element is freely placed between the bushings, and the elastic element in the upper part is supported by a disk fixed in the housing, and supported in the lower part.

 The elastic element can be installed in the lower radial support, and in the upper part the elastic element rests on the disk mounted on the shaft, and in the lower part - on the disk fixed in the housing.

Analysis of the claimed object in relation to the prototype shows the presence of significant distinguishing features:
the upper radial support is made in the form of two bushings and two disks and an elastic cylindrical element;
the elastic cylindrical element is made of a wear-resistant material with a low coefficient of friction with a compression spring vulcanized inside;
one sleeve and disk are mounted on the shaft, and the other sleeve and disk are in the housing;
the elastic element in the upper part rests on a disk fixed in the housing, and in the lower part on a disk mounted on a shaft;
the elastic element is installed in the lower radial support, and in the upper part it is supported by a disk fixed on the shaft, and in the lower part - by a disk fixed in the housing.

 Thus, the claimed device meets the criterion of "novelty."

The positive effect is as follows:
the exception of the runout of the shaft relative to the housing within the clearance of the axial support;
increase in wear resistance of friction disk-thrust bearings;
elimination of disk breakdowns.

 Comparison of the proposed solution not only with the prototype, but also with other technical solutions in this technical field did not allow us to identify signs that distinguish the claimed solution from the prototype, which allows us to conclude that the criterion of "significant differences".

 In FIG. 1 shows a spindle of a downhole motor in which an elastic element is placed in an upper radial support; in FIG. 2 - the same, the elastic element is placed in the lower radial support.

 The downhole motor spindle consists of a housing 1, a shaft 2, a multi-stage axial support, including disks 3, thrust bearings 4, radial bearings - the lower 5, and the upper consists of a sleeve 6 mounted on the shaft 2, and a sleeve 7 mounted in the housing, between which freely placed elastic cylindrical element 8 of a wear-resistant material with a low coefficient of friction (for example, rubber). In element 8, a compression spring 9 is vulcanized. In the upper part, the element 8 is supported by a disk 10 mounted on the shaft 2. On the shaft, the parts are attached by the axial tightening force of the coupling halves 11, and in the case by the sub 12.

 The downhole motor spindle (Fig. 2) consists of a housing 1, a shaft 2, a multi-stage support, including disks 3 and thrust bearings 4, radial bearings - the upper 5, and the lower one consists of a sleeve fixed in the housing 1, a sleeve 7 mounted on the shaft 2 between which the elastic element 8 is freely placed, in which the compression spring 9 is vulcanized. In the upper part, the elastic element rests on the disk 3, mounted on the shaft 2, and in the lower part, on the disk 10, mounted in the housing 1.

 During drilling with cone bits, significant dynamic loads are transmitted through the spindle bearings. The presence of an elastic element in one of the radial bearings provides constant one-sided compression of the working surfaces of the disks 3 and thrust bearings 4, prevents axial runout of the shaft 2 relative to the housing 1 within the clearance of the axial support. For drilling in Western Siberia, where there is a predominant wear of the discs 3 from the bottom, and the thrust bearings 4 from the top, it is recommended to install an elastic element 8 in the upper radial support (Fig. 1). For the Ural-Volga region, Azerbaijan with the prevailing wear of the disks 3 above, and the thrust bearings 4 below, the elastic element 8 is installed in the lower radial support (Fig. 2).

 The installation of an elastic element in the radial support, providing one-sided constant preloading of the working surfaces of the disks and thrust bearings, will increase the reliability of the axial rubber-metal support by eliminating the axial runout of the shaft within the clearance without changing the overall dimensions of the downhole motor spindle.

Claims (2)

 1. BOTTOM ENGINE SPINDLE, comprising a housing, a shaft located inside the housing, rubber-metal axial and radial bearings, characterized in that, in order to increase the reliability of the spindle by providing constant compression of the working surfaces of the disks and thrust bearings of the axial bearings while maintaining linear dimensions, the upper radial bearing the spindle is made in the form of two bushings and two disks, and an elastic cylindrical element made of wear-resistant material with a low coefficient of friction with vulcanized inside with compression, while one sleeve and disk are mounted on the shaft, and the other sleeve and disk are fixed in the housing, and the elastic element is freely placed between the bushings, and the elastic element in the upper part rests on the disk fixed in the housing, and in the lower part rests on a disk mounted on a shaft.  2. The spindle according to claim 1, characterized in that the elastic element is installed in the lower radial support, and in the upper part of the elastic element rests on a disk mounted on the shaft, and in the lower part on a disk fixed in the housing.

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