RU93866U1 - AXIAL MULTI-STAGE BOTTOM MOTOR SLIDING BRACKET - Google Patents

Abstract

 An axial multi-stage sliding bearing of the downhole motor, comprising rotating disks mounted on the shaft, fixed disks placed in the housing, the working ends of which are provided with protruding inserts, each of which contains a layer of polycrystalline diamonds at the end facing the ends of adjacent inserts, and elastic elements, characterized in that the elastic elements mounted on the shaft are flush with the metal cores and rotate together with the disks, and the rotating disks have the possibility of axial movement scheniya relative to the shaft and interacting with the shaft through key connection fixed to the shaft through the spacer sleeve.

Description

The utility model relates to the oil and gas industry, in particular to devices for drilling wells.

Known axial multi-stage sliding bearing, made as a multi-stage bearing, each stage of which consists of a thrust bearing - a flat metal part having protruding rubber plates on the end surfaces, heel disks, the outer ring and the inner ring (1).

The disadvantage of this device is its low resistance when working in an environment of an abrasive clay solution.

Known hydraulic downhole motor with a diamond sliding support, which is made in the form of two pairs of rotor and stator rings. In each of the rings an annular row of thrust modules is fixed. The stator rings are rigidly fastened to the spindle body, rotor with the spindle shaft, and each thrust module contains a layer of polycrystalline diamonds at the end facing the ends of adjacent modules.

The disadvantage of such a support is the lack of a damping mechanism for dynamic loads, which does not allow to fully realize the possibility of increasing the resource and reliability of the support (2).

The closest technical solution chosen by the author for the prototype is the axial sliding bearing of the downhole motor, containing rotating disks mounted on the shaft, fixed disks placed in the housing, and elastic elements. The working ends of the disks are equipped with carbide inserts placed around the circumference, and the non-rotating disk interacts with the housing through an elastic element by means of at least three radial protrusions made on the rear end of the disk and in contact with radial depressions on the end surfaces of the elastic elements (3).

The disadvantages of the known design are as follows: during the operation of the support, a high temperature occurs in the contact zone of the inserts, and the low thermal conductivity of the hard alloy prevents the rapid removal of heat. As a result of overheating, microcracks occur on the working surfaces of the inserts, which leads to their rapid destruction. The protruding part of the elastic support element during operation is subject to deformation, as a result of which the overheating of the elastic element and its destruction occurs. The stability of such a support when working in an abrasive fluid environment does not exceed 100 hours, which does not meet the modern requirements of well drilling technology, as the currently used modern drilling designs provide a flight duration of up to 300 hours or more.

The technical problem to which the utility model is directed is to increase the reliability and durability of the support under operating conditions in the environment of abrasive flushing fluid and high axial dynamic loads.

To solve this problem, in the axial sliding support of the downhole motor, containing rotating disks mounted on the shaft and non-rotating disks located in the housing, the working ends of which are provided with protruding inserts, each of which contains a layer of polycrystalline diamonds at the ends of adjacent inserts facing the ends, mounted on the shaft the elastic elements are flush with the skeletons and rotate together with the disks, the rotating disk being able to axially move and interact with the shaft by a keyed connection through a spacer mounted on the shaft.

Figure 1 shows an axial multi-stage sliding bearing of a downhole motor. The support consists of a fixed disk 1, fixed in the housing 2 by axial compression of the spacer sleeves 3. An annular row of inserts 4 containing a layer of polycrystalline diamonds 5 is fixed on the working end of the disk 1. 8 of the elastic element 9. Between the elastic element and the fixed disk, a rotating disk 10 is mounted on the spacer sleeve. At the working end of the disk 10, an annular row of inserts containing a layer of polycrystalline alm is also fixed the basics. The disk 10 has the possibility of axial movement relative to the shaft 6, from rotation the disk holds the key connection 11.

The new support uses a polycrystalline diamond layer as a friction pair, which makes it very resistant to abrasion.

During the operation of the new support, the axial load from the shaft to the body is transmitted through the elastic element, which allows you to evenly distribute the load along the steps of the support, as well as absorb shock loads that occur during operation of the bit on the bottom of the well.

In the design of the new support, a decrease in the elastomer deformation due to its deepening into the core was achieved, which made it possible to increase the operability of the elastic element by reducing internal friction, which causes an increase in temperature and acceleration of the aging process of the elastomer.

Heat is removed from the rubbing surfaces in the new support by both a small volume of flushing fluid flowing in between the protruding inserts and the main volume passing through the hollow fluid shaft.

Sources of information taken into account during the examination

1. Gusman M.T., Lyubimov B.G., Nikitin G.M. and others. "Calculation, design and operation of turbodrills" M., "Nedra", 1976, p.205.

2. RU 2340757 C1, 03.21.2007.

3. RU 2172383 C2.28.06.1999. - prototype.

Claims (1)

An axial multi-stage sliding bearing of the downhole motor, comprising rotating disks mounted on the shaft, fixed disks placed in the housing, the working ends of which are provided with protruding inserts, each of which contains a layer of polycrystalline diamonds at the end facing the ends of adjacent inserts, and elastic elements, characterized in that the elastic elements mounted on the shaft are flush with the metal cores and rotate together with the disks, and the rotating disks have the possibility of axial movement scheniya relative to the shaft and interacting with the shaft through key connection fixed to the shaft through the spacer sleeve.