Axial bearing slide downhole motor

 

(57) Abstract:

The invention relates to the oil and gas industry, in particular to devices used in drilling wells. The invention consists in that the working ends of the disk axial bearing is equipped with carbide protruding inserts placed around the circumference of the friction, the minimum clearance between them is less than the lateral dimension of the insert on the same circumference, and the non-rotating disk is mounted for engagement with the frame via an elastic element by means of at least three radial projections made on the back side of the disc and in contact with the radial depressions on the end surfaces of the elastic elements. The invention provides improved reliability axial bearing hole of the engine when operating in conditions saleabration environment. 3 Il.

The invention relates to the oil and gas industry, in particular to devices used in drilling wells.

Known multistage axial bearing slides, designed as multi-stage bearing, each stage of which consists of a thrust bearing is a flat metal part having a protruding >The disadvantage of this device is a low resistance when working in the environment of abrasive mud.

The closest technical solution chosen by the author for the prototype is the axial bearing of the sliding hole of the engine, containing mounted on the shaft of the rotating disks are accommodated in the housing nonrotating disks and elastic elements. However, this support is not reliable, especially in abrasive environment there is wear of the contacting elastic and metallic friction elements. Therefore, the resistance of support in the environment of abrasive fluids do not exceed 100-150 hours

This resistance does not meet modern requirements drilling technology, as used in the present design of the rock cutting elements provide the duration of the flight up to 300 hours or more.

The objective of the invention is to enhance reliability axial bearing hole of the engine when operating in conditions of highly abrasive environment. To solve this problem in the axial bearing of the sliding hole of the engine, containing mounted on the shaft of the rotating disks are accommodated in the housing nonrotating disks and elastic elements, the working ends of the drive is equipped with carbide invoice is knogo size inserts on the same circumference, moreover, the non-rotating disk is mounted for engagement with the frame via an elastic element by means of at least three radial projections made on the back side of the disc and in contact with the radial depressions on the end surfaces of the elastic elements.

In Fig. 1, 2 and 3 depict, respectively, the degrees of the axial sliding bearing, the cross section at contact surface of the carbide inserts and longitudinal section of the disk in contact with the elastic element.

Bearing consists of a rotating disk 1 attached to the shaft by axial compression spacer sleeves 2. End surface of the disk exposed reinforced over them carbide inserts 3, placed around the circumference of the friction with the space between the inserts "a", which is less than the lateral dimension of the "in" insert on the same circumference. The working side of the non-rotating disc 4 is also reinforced by inserts. The back side of the disk 4 has three radial protrusions 5, which are radial depressions made on the end surface of the sheath elastic element 9. Metal frame elastic element 6 is mounted in the housing 7 by axial compression of the bushings 8.

In the new support, in contrast to known the hardness of the abrasive particles in the drilling fluid), that makes it very resistant to abrasive wear. The test results of laboratory samples, simulating the axial bearing downhole motor, showed that in a wide range of axial loads and engine speeds when working in the aquatic environment, carbide pair has a coefficient of friction less than the coefficient of friction pairs rubber-metal.

In the process, supports the axial load from the shaft to the housing is transmitted through the elastic element, which allows to evenly distribute the load along the rows, columns and dampens shock loads that occur during operation of the bit on the bottom of the borehole.

The heat from the friction surfaces of the disks is made as small amount of washing liquid flowing in between the protruding carbide inserts and the main volume passing through the hollow spindle shaft fluid.

Sources of information

1. Guzman, M. I., Lyubimov B. G., Nikitin, M. and others, "design, construction and operation of turbodrills", M, "Nedra", 1976, page 205.

2. Guzman, M. I., Lyubimov B. G., Nikitin, M. and others, "design, construction and operation of turbodrills", M, "Nedra", 1976, pages 247 - prototype.

Axial bearing scoliosis disks and elastic elements, characterized in that the working ends of the carbide discs have protruding inserts placed around the circumference of the friction, the minimum clearance between them is less than the lateral dimension of the insert on the same circumference, and the non-rotating disk is mounted for engagement with the frame via an elastic element by means of at least three radial projections made on the back side of the disc and in contact with the radial depressions on the end surfaces of the elastic elements.

 

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