Radial bearing for downhole motor

FIELD: well drilling equipment, particularly bearings adapted to work in abrasive medium.

SUBSTANCE: radial bearing has body and shaft, as well as thrust collars secured in the body and spring-loaded holders arranged between the shaft and the body. Inserts with conical outer surfaces are located between the holders and the shaft so that inserts cooperate with the shaft and with inner surfaces of the holders. Radial bearing is made as two oppositely arranged blocks and as compression spring inserted in-between. Each block has stop member secured in the body and made as slotted bush. Inserts are arranged in the bush and may perform displacement in radial direction. Thrust collars have conical surfaces cooperating with outer surfaces of the inserts. Angles α at apexes of the cones defined by interacted conical surfaces of bearing support inserts, thrust collars and holders are correlated with friction coefficient μ of interacted surfaces as tg(α/2)≈μ. Insert surfaces cooperating with shaft surface may have coating of elastomeric or hard-alloy material. In accordance with the second embodiment surfaces of inserts, thrust collars and holders interacting one with another may have flat contact zones, which are inclined at (α/2) angle to longitudinal shaft axis.

EFFECT: increased operational reliability of radial bearing.

6 cl, 3 dwg

 

The present invention relates to a drilling technique, particularly to support structures downhole motors, operating in abrasive environment.

Known construction radial bearings downhole motors (rotary drills, screw engines), including accommodated in the housing and on the shaft of the sleeve in contact with each other on the cylindrical surfaces, one of which can be obezyana, the other hardened (see for example the book: Dobkin V.A., Nikitin G.M., Utrobin AA "Maintenance and repair of hydraulic downhole motors". - M.: Nedra, 1983, p.29-30) or both reinforced carbide materials (see, for example. Scientific - technical journal "Construction of oil and gas wells on land and at sea". - M.: VNIIEM, No. 9, September 2003, p.10).

The main disadvantage of all known and are widely used radial bearings downhole motors along with the lack of durability is the fact that when the radial clearance in the bearing during its wear control trajectory of the wellbore, especially in directional and especially in horizontal drilling becomes difficult and often impossible.

Known design radial bearing face of the engine, taken as a prototype, in which this problem is partially solved because it contains the thrust ring and the cage, o f the data between the shaft and the housing, retainer rings are made with grooves, and spring-loaded clip, between the sleeves and the shaft is installed liners with conical outer surfaces, incoming mechanical parts in the grooves of the thrust rings and cooperating with the inner surfaces of the clamps (see ed. mon. The USSR №832015, CL E 21 3/12, 20.07.77 year).

Despite the fact that in the mentioned support is the compensation function of radial wear, it has several disadvantages: 1) each of the bearing blocks, consisting of thrust washers, bushings and spring clips, performing the function of the wear compensation, however, does not exclude the possibility of misalignment of the shaft together with the liner, because the length of the contact surface of the liner and the shell is limited; 2) when significant quantities of radial wear of the contact surfaces of the shaft and liner axial displacement of the holder contact the conical surface of the liner does not provide seal these surfaces, which exacerbates the possibility of misalignments of the shaft and "clogging" of the contact surfaces; 3) finally, in this system compensates support with insufficient basic support length centering shaft may be broken.

The technical challenge which aims present the alleged invention, is to eliminate the above disadvantages and the creation of such a radial bearing face a number is La, design which when working in abrasive environment would provide an exception distortions shaft liners, airtight surfaces of the liner and the shell and removing the possibility of violations of the centering shaft while ensuring the function of the compensation of the radial wear of interacting surfaces of the bearings and the shaft.

The solution of the technical problem is achieved in that the radial bearing face of the engine including a housing and a shaft, made in the form of two opposed spaced blocks, between which there is a spring, each of the blocks contains fixed in the housing thrust ring disposed between the shaft and the housing holder with the possibility of axial movement and liner, with a conical outer surface, mounted between the yoke and the shaft with the opportunity to interact with the internal conical surface of the shroud, with each block contains fixed in the housing and is designed as a slotted sleeve retainer, in which the possibility of radial movement placed the liner and hard o-rings are made with internal conical surfaces for engagement with the outer tapered surfaces of the liners. Corners (α) at the vertex of the cones tapered surfaces of the thrust washers, bushings and clamps are in the following ratio with adjusted what antom friction (μ materials of the friction pairs: thrust rings - ear, clip - liners: tg(α/2)≈μ; interacting with the surface of the shaft surface liners are made with a coating of elastomeric or carbide material.

A similar solution is achieved in the embodiment, the radial support face of the engine including a housing and a shaft, made in the form of two opposed spaced blocks, between which there is a spring, each of the blocks contains fixed in the housing thrust ring disposed between the shaft and the housing holder with the possibility of axial movement and the liner installed between the ferrule and the shaft with the opportunity to interact with the inner surface of the shroud, despite the fact that each block contains fixed in the housing and is designed as a slotted sleeve retainer, in which the possibility of radial movement placed the liner and retainer rings are installed with the possibility of interaction between internal surface with the outer surface of the liners. In the embodiment, the radial support of the interacting surfaces of the bushings, thrust washers and clips are made with inclined to the longitudinal axis of the shaft at an angle α/2 flat contact areas; interacting with the shaft surface liners are made with a coating of elastomeric or carbide material.

Possibly the ity of the proposed of the present invention is confirmed by the successful application of compensating radial bearings (prototype) at its industrial use in the fields of Tatneft in the 70-ies, revealed at the same time, the above-mentioned disadvantages. Distinguishing characteristics reflected in the formula of this present invention can be implemented using tools used in petroleum engineering. These characteristics are necessary and sufficient, as they provide the solution of this problem is the creation of such a radial bearing face of the engine, in which when working in abrasive environment are eliminated distortions and violations of centering the shaft in the radial compensation of wear, which increases the operational reliability and durability of the downhole motor, especially in deep directional and horizontal drilling.

Further declare that the present proposed invention is illustrated by embodiments thereof, shown schematically in the attached figures, in which:

figure 1 is a longitudinal section of the site downhole motor hosting the radial support,

figure 2 is a cross section on stoparea device (spline hub) and inserts

figure 3 - axonometric view of embodiment of a flat contact areas.

Radial bearing downhole motor (figure 1), are accommodated in the housing 1 and the shaft 2, is made in the form of two opposed spaced blocks, each of which contains: thrust ring 3 and the locking device 4, zakreplena the housing, for example, by an axial compression on the ends of the sleeves 5, clip 6, placed between the housing and the shaft, the bushings 7, with the outer conical surface 8, which interacts with the response of the internal conical surfaces 9 of the thrust ring 3 and 10 clips 6. Corners (α) at the top of the cone for cone surfaces of the thrust ring 3, the clamps 6 and bearings 7 are selected from the relation: tg(α/2)≈μwhere μ - coefficients of friction for the materials of the friction pairs: thrust ring - liner, the liner - holder. Between the clamps 6 are arranged spaced blocks mounted compression spring 11, to protect from zellamsee can be used freely set the sleeve protector 12. The liners 7 and the inner cylindrical surface 13 can be made with an elastomeric coating or hardened carbide. The surface 13 of the liners are in contact with the outer cylindrical surface of the sleeve 14 of the shaft 2, which can also be hardened carbide coating. The locking device 4, a slotted sleeve with slots 15 (figure 2) or other items of similar purpose, providing along with locking against rotation freedom of radial and axial movement installed in them liners 7.

In the embodiment of the support (figure 3) articulating surfaces of the liner is th 7, guide ring 3 and the casing 6 is made mechanicheskii, and inclined to the longitudinal axis of the flat contact areas 16. Corners (α/2) the inclination of these surfaces to the axis are also selected from the relation: tg(α/2)≈μ.

Opposed spaced blocks in both cases, the support consisting of the above elements separated by a spacer (remote) sleeve 17, is included in the General system we clamp along the axis of the case 1, parts 3, 4 and 5 radial bearings.

Radial bearing downhole motor operates as follows.

Spring 11 maintains a constant pressure of the clamps 6 to the pads 7, which, having on the opposite side of the contact on the conical surface of the thrust ring 3 is pressed against the shaft 2. Pressing force determined by the angle α/2 of the interacting surfaces (8 and 9, 8 and 10) and the force of the spring 11, is selected on the basis of the valid values of the contact pressure in the pair of surfaces 13 and 14, as the initial value to select the characteristics of the spring 11 and the angle α. When radial clearance (wear) a pair of friction surfaces 13 and 14 under the action of the spring 11 of the cage 6 is displaced in the axial direction as the conical surface of the cone 6 and the guide ring 3, interacting with mating surfaces of the inserts 7, cause radial movement of the inserts 7 in the slots 15 of stops at the of troist - slotted bushing 4 in the direction of the shaft 2. The result is the elimination of radial clearance, i.e. compensation for wear of the contacting surfaces of the radial bearings and the preservation of the centering shaft of the downhole motor.

When you move the liners 7 and the conical surfaces of the thrust ring 3 and the casing 6 and the conical surfaces of the liners 7 full adhesion of the contacting conical surfaces takes place only at the initial moment, and then contact is made on the terminal edges, but it almost does not affect the effect of compensation of radial play, because when high specific loads on the end edges they work and fit on the conical surfaces restored.

In an embodiment of the surfaces, which interact liners 7 with thrust ring 3 and the clamps 6, flat contact areas inclined to the axis at an angle (α/2), the displacement of the clamps 6 and bearings 7 in the axial direction does not break contact of these surfaces, which improves the hardness and, consequently, wear of these surfaces.

The choice of angle α in both of the above versions radial bearings such that tg(α/2)≈μexcludes desantirovanie shaft in the event of an external radial loads acting on Balabanovo engine i.e. the impossibility of squeezing the pads in the radial direction as they move along the inclined surface (tapered or flat) under the action of radial forces at the "angle of friction", which is close to the coefficient of friction, will not happen. In turn, when the radial clearance due to wear of the friction pair: insert - shaft, compensation (i.e. the elimination of this gap is due to the axial movement of the clamps on inclined surfaces (conical or flat) under the action of the spring, strengthening and vibration downhole motor.

The location of the external tapered (inclined or flat) surfaces of the liner 7 on both of its ends in engagement with mating surfaces of the thrust ring 3 and the casing 6 provides a reliable alignment, elimination of bias liners and their radial movement to compensate for radial wear of the friction surfaces of the radial bearings.

The choice of the axial length of the spacer sleeve 17 fundamentally is not restricted, therefore, the base of the radial bearing can be set based on the design requirements of a reliable centering of the shaft.

The above-described radial bearing downhole motor applicable components of structures turbodrills, screw downhole motors and other machines of similar purpose, in which trouble is novenia radial clearance due to wear of radial bearings not only reduces the efficiency of the engine, but also leads to a significant deviation from the technological requirements of the wellbore, especially in terms of directional drilling (directional and horizontal wells).

The offered bearing is also applicable in other fields of engineering, where there are similar requirements.

1. Radial bearing downhole motor including a housing and a shaft, made in the form of two opposed spaced blocks, between which there is a spring, each of the blocks contains fixed in the housing thrust ring disposed between the shaft and the housing holder with the possibility of axial movement and the liner with a conical outer surface, mounted between the yoke and the shaft with the opportunity to interact with the internal conical surface of the shroud, wherein each block contains fixed in a housing made in the form of a slotted sleeve retainer, in which the possibility of radial movement placed the liner and retainer rings are made with internal conical surfaces to interact with external conical surfaces of the liners.

2. Radial bearing according to claim 1, characterized in that the angles α at the top of the cones tapered surfaces of the thrust washers, bushings and clamps are in the following ratio with a coefficient of friction μ materials pairs t is possible: thrust ring-liners, clip-ear: tgα/2≈μ

3. Radial bearing according to claim 1, wherein interacting with the shaft surface liners are made with a coating of elastomeric or carbide material.

4. Radial bearing downhole motor including a housing and a shaft, made in the form of two opposed spaced blocks, between which there is a spring, each block contains fixed in the housing thrust ring disposed between the shaft and the housing holder with the possibility of axial movement and the liner installed between the ferrule and the shaft with the opportunity to interact with the inner surface of the shroud, wherein each block contains fixed in a housing made in the form of a slotted sleeve retainer, in which the possibility of radial movement placed the liner and retainer rings are installed with the possibility of interaction between the inner surface with the outer surface of the liners.

5. Radial bearing according to claim 4, characterized in that the interacting surfaces of the bushings, thrust washers and clips are made with inclined to the longitudinal axis of the shaft at an angle α/2 flat contact areas.

6. Radial bearing according to claim 4, wherein interacting with the shaft surface liners are made with a coating of elastomeric or carbide m is material.



 

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3 dwg

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2 cl, 10 dwg

FIELD: well drilling equipment, particularly bearings adapted to work in abrasive medium.

SUBSTANCE: radial bearing has body and shaft, as well as thrust collars secured in the body and spring-loaded holders arranged between the shaft and the body. Inserts with conical outer surfaces are located between the holders and the shaft so that inserts cooperate with the shaft and with inner surfaces of the holders. Radial bearing is made as two oppositely arranged blocks and as compression spring inserted in-between. Each block has stop member secured in the body and made as slotted bush. Inserts are arranged in the bush and may perform displacement in radial direction. Thrust collars have conical surfaces cooperating with outer surfaces of the inserts. Angles α at apexes of the cones defined by interacted conical surfaces of bearing support inserts, thrust collars and holders are correlated with friction coefficient μ of interacted surfaces as tg(α/2)≈μ. Insert surfaces cooperating with shaft surface may have coating of elastomeric or hard-alloy material. In accordance with the second embodiment surfaces of inserts, thrust collars and holders interacting one with another may have flat contact zones, which are inclined at (α/2) angle to longitudinal shaft axis.

EFFECT: increased operational reliability of radial bearing.

6 cl, 3 dwg

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EFFECT: reduced costs of spindle usage.

5 dwg

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