Sliding bearing assembly of well drilling system

Abstract

The utility model discloses a sliding bearing assembly of a well drilling system. The sliding bearing assembly comprises an upper radial centralizing sliding friction pair, an upper axial thrust sliding friction pair, a lower radial centralizing sliding friction pair and a lower axial thrust sliding friction pair, the area of the friction surface of the upper axial thrust sliding friction pair is larger than that of the friction surface of the lower axial thrust sliding friction pair, and the area of the friction surface of the lower radial centralizing sliding friction pair is larger than that of the friction surface of the upper radial centralizing sliding friction pair, so that the contact stress of the upper axial thrust sliding friction pair is reduced; the contact stress of the lower axial thrust sliding friction pair is increased; the contact stress of the upper radial centralizing sliding friction pair is increased, and the contact stress of the lower radial centralizing sliding friction pair is reduced, so that the abrasion speeds of the four sliding friction pairs tend to be consistent, the reliability of the sliding bearing assembly is improved, and the service life of the sliding bearing assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of metal processing and manufacturing of downhole tools for drilling, in particular to a sliding bearing assembly of a drilling system. Background Art

[0002] In the 1990s, the emergence of rotary steerable drilling technology changed the traditional operation mode of directional well technology in controlling wellbore trajectory. Rotary steerable drilling has made breakthrough progress in operation efficiency and safety, especially in large-reach drilling technology. The rotary steerable drilling system or vertical drilling system has a complex structure, harsh working conditions, and complex loads. The structural design of the core key components of the rotary steerable drilling system or vertical drilling system needs to be optimized, and its performance and life need to be further improved.

[0003] The technical solution adopted by the existing technology "double axial action sliding bearing assembly for rotary guide short section" in my country is: the material of the upper radial straightening sliding friction pair with less force and the lower axial thrust sliding friction pair with less force is selected as the polycrystalline diamond (PCD) friction part (its wear ratio is generally 30,000-50,000), and the material of the lower radial straightening sliding friction pair with greater force and the upper axial thrust sliding friction pair with greater force is selected as the polycrystalline diamond and cemented carbide composite (PDC) friction part (its wear ratio is generally 400,000-600,000). Since the wear resistance of the polycrystalline diamond friction part is much lower than that of the polycrystalline diamond and cemented carbide composite friction part, the most ideal material for the four pairs of sliding friction pairs of the sliding bearing assembly of the domestic rotary guide drilling system or vertical drilling system is the polycrystalline diamond and cemented carbide composite friction part.

[0004] However, it was found during the actual manufacturing and use process that even if the friction parts of the four pairs of sliding friction pairs of the sliding bearing assembly of the rotary steerable drilling system or the vertical drilling system are all made of a composite friction part of polycrystalline diamond and cemented carbide, there are still significant differences in the wear conditions of the four pairs of sliding friction pairs. For example, the wear of the upper radial righting sliding friction pair is much smaller than that of the upper axial thrust sliding friction pair, and the wear of the lower axial thrust sliding friction pair is much smaller than that of the lower radial righting sliding friction pair, which seriously affects the reliability, service life and cost of the rotary steerable drilling system or the vertical drilling system.

[0005] Therefore, it is necessary to provide a new sliding bearing assembly for a drilling system, in which the difference in contact stress between the upper axial thrust sliding friction pair subjected to greater force and the lower axial thrust sliding friction pair subjected to less force is reduced; the difference in contact stress between the lower radial righting sliding friction pair subjected to greater force and the upper radial righting sliding friction pair subjected to less force is reduced; and the wear rate or working life of the four pairs of sliding friction pairs is basically equal, so as to better meet the requirements of high reliability, long working life and low cost of the drilling system. Utility Model Content

[0006] In order to overcome at least one defect in the prior art, the utility model provides a sliding bearing assembly for a drilling system, in which the contact stress of the upper axial thrust sliding friction pair and the lower radial straightening sliding friction pair is reduced to a certain extent, and the contact stress of the lower axial thrust sliding friction pair and the upper radial straightening sliding friction pair is increased to a certain extent, and the contact stress fluctuation range of the four pairs of sliding friction pairs is narrowed, or / and the contact stress is basically equal.

[0007] The above-mentioned purpose of the utility model can be achieved by adopting the following technical solutions:

[0008] A drilling system sliding bearing assembly, comprising: an upper radial centering sliding friction pair, an upper axial thrust sliding friction pair; a lower radial centering sliding friction pair, and a lower axial thrust sliding friction pair;

[0009] The upper radial centering sliding friction pair includes an upper radial centering sliding bearing rotor and an upper radial centering sliding bearing stator; the upper axial thrust sliding friction pair includes an upper axial thrust sliding bearing rotor and an upper axial thrust sliding bearing stator; the lower radial centering sliding friction pair includes a lower radial centering sliding bearing rotor and a lower radial centering sliding bearing stator; the lower axial thrust sliding friction pair includes a lower axial thrust sliding bearing rotor and a lower axial thrust sliding bearing stator;

[0010] The upper radial straightening sliding bearing rotor comprises an upper radial straightening sliding bearing rotor base and a first radial straightening sliding friction portion; the upper axial thrust sliding bearing rotor comprises an upper axial thrust sliding bearing rotor base and a first axial thrust sliding friction portion;

[0011] The upper radial centering sliding bearing stator comprises an upper radial centering sliding bearing stator base and a second radial centering sliding friction portion; the upper axial thrust sliding bearing stator comprises an upper axial thrust sliding bearing stator base and a second axial thrust sliding friction portion;

[0012] The material of the first radial righting sliding friction portion is the same as that of the second radial righting sliding friction portion, but the sum of the friction surface areas of the first radial righting sliding friction portion is not equal to the sum of the friction surface areas of the second radial righting sliding friction portion; the material of the first axial thrust sliding friction portion is the same as that of the second axial thrust sliding friction portion, but the sum of the friction surface areas of the first axial thrust sliding friction portion is not equal to the sum of the friction surface areas of the second axial thrust sliding friction portion;

[0013] The lower radial centering sliding bearing rotor comprises a lower radial centering sliding bearing rotor base and a third radial centering sliding friction portion; the lower axial thrust sliding bearing rotor comprises a lower axial thrust sliding bearing rotor base and a third axial thrust sliding friction portion;

[0014] The lower radial centering sliding bearing stator comprises a lower radial centering sliding bearing stator base and a fourth radial centering sliding friction portion; the lower axial thrust sliding bearing stator comprises a lower axial thrust sliding bearing stator base and a fourth axial thrust sliding friction portion;

[0015] The material of the third radial straightening sliding friction part is the same as that of the fourth radial straightening sliding friction part, but the sum of the friction surface areas of the third radial straightening sliding friction part is not equal to the sum of the friction surface areas of the fourth radial straightening sliding friction part; the material of the third axial thrust sliding friction part is the same as that of the fourth axial thrust sliding friction part, but the sum of the friction surface areas of the third axial thrust sliding friction part is not equal to the sum of the friction surface areas of the fourth axial thrust sliding friction part.

[0016] In a preferred embodiment, the material of the second radial righting sliding friction portion is the same as that of the fourth radial righting sliding friction portion, but the sum of the friction surface areas of the second radial righting sliding friction portion is not equal to the sum of the friction surface areas of the fourth radial righting sliding friction portion.

[0017] In a preferred embodiment, the material of the second axial thrust sliding friction portion is the same as that of the fourth axial thrust sliding friction portion, but the sum of the friction surface areas of the second axial thrust sliding friction portion is not equal to the sum of the friction surface areas of the fourth axial thrust sliding friction portion.

[0018] In a preferred embodiment, the material of the first radial righting sliding friction part, the material of the second radial righting sliding friction part, the material of the third radial righting sliding friction part and the material of the fourth radial righting sliding friction part are the same, but the sum of the friction surface areas of the fourth radial righting sliding friction part is greater than the sum of the friction surface areas of the third radial righting sliding friction part, the sum of the friction surface areas of the third radial righting sliding friction part is equal to the sum of the friction surface areas of the first radial righting sliding friction part, and the sum of the friction surface areas of the first radial righting sliding friction part is greater than the sum of the friction surface areas of the second radial righting sliding friction part; the material of the first axial thrust sliding friction part, the material of the second axial thrust sliding friction part, the material of the third axial thrust sliding friction part and the material of the fourth axial thrust sliding friction part are the same, but the sum of the friction surface areas of the second axial thrust sliding friction part is greater than the sum of the friction surface areas of the first axial thrust sliding friction part, the sum of the friction surface areas of the first axial thrust sliding friction part is equal to the sum of the friction surface areas of the third axial thrust sliding friction part, and the sum of the friction surface areas of the third axial thrust sliding friction part is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction part.

[0019] In a preferred embodiment, the material of the first radial straightening sliding friction part, the material of the second radial straightening sliding friction part, the material of the third radial straightening sliding friction part, the material of the fourth radial straightening sliding friction part, the material of the first axial thrust sliding friction part, the material of the second axial thrust sliding friction part, the material of the third axial thrust sliding friction part and the material of the fourth axial thrust sliding friction part are the same, and are all polycrystalline diamond and cemented carbide composite (PDC) friction parts, or polycrystalline diamond (PCD) friction parts.

[0020] In a preferred embodiment, the first radial righting sliding friction portion is divided into 1-3 circles, which are uniformly arranged without staggering or uniformly staggered in the circumference on the outer cylindrical surface of the upper radial righting sliding bearing rotor base; the second radial righting sliding friction portion is divided into 1-3 circles, which are uniformly arranged without staggering or uniformly staggered in the circumference on the inner cylindrical surface of the upper radial righting sliding bearing stator base; the third radial righting sliding friction portion is divided into 2-3 circles, which are uniformly arranged without staggering or uniformly staggered in the circumference on the outer cylindrical surface of the lower radial righting sliding bearing rotor base; the fourth radial righting sliding friction portion is divided into 2-3 circles, which are uniformly arranged without staggering or uniformly staggered in the circumference Staggered or circumferentially uniformly staggered on the inner cylindrical surface of the stator base of the lower radial righting sliding bearing; the first axial spacing of the first radial righting sliding friction part is equal to the second axial spacing of the second radial righting sliding friction part; the third axial spacing of the third radial righting sliding friction part is equal to the fourth axial spacing of the fourth radial righting sliding friction part; the first axial spacing is 10.0mm-100.0mm, the second axial spacing is 10.0mm-100.0mm, the third axial spacing is 10.0mm-100.0mm, and the fourth axial spacing is 10.0mm-100.0mm.

[0021] In a preferred embodiment, the material of the first radial straightening sliding friction part, the material of the second radial straightening sliding friction part, the material of the third radial straightening sliding friction part and the material of the fourth radial straightening sliding friction part are the same, all of which are cemented carbide (TC) friction parts; the material of the first axial thrust sliding friction part, the material of the second axial thrust sliding friction part, the material of the third axial thrust sliding friction part and the material of the fourth axial thrust sliding friction part are the same, all of which are polycrystalline diamond and cemented carbide composite (PDC) friction parts, or polycrystalline diamond (PCD) friction parts.

[0022] In a preferred embodiment, the first radial righting sliding friction portion is arranged on the outer cylindrical surface of the upper radial righting sliding bearing rotor base, the second radial righting sliding friction portion is arranged on the inner cylindrical surface of the upper radial righting sliding bearing stator base, the third radial righting sliding friction portion is arranged on the outer cylindrical surface of the lower radial righting sliding bearing rotor base, and the fourth radial righting sliding friction portion is arranged on the inner cylindrical surface of the lower radial righting sliding bearing stator base; the first axial length of the first radial righting sliding friction portion is equal to the second axial length of the second radial righting sliding friction portion, and the third axial length of the third radial righting sliding friction portion is equal to the fourth axial length of the fourth radial righting sliding friction portion; the first axial length is 30.0mm-120.0mm, the second axial length is 30.0mm-120.0mm, the third axial length is 30.0mm-120.0mm, and the fourth axial length is 30.0mm-120.0mm.

[0023] In a preferred embodiment, the cross-sectional shape of the cemented carbide (TC) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and sector shape, or / and polygonal; the cross-sectional shape of the polycrystalline diamond (PCD) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and sector shape, or / and polygonal; the cross-sectional shape of the polycrystalline diamond and cemented carbide composite (PDC) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and sector shape, or / and polygonal.

[0024] The present application provides a drilling system sliding bearing assembly: the upper radial righting sliding friction pair transmits the radial pushing force from the supporting ribs received by the upper end of the non-rotating outer cylinder to the input end of the rotating core shaft, the upper axial thrust sliding friction pair limits the upward movement of the non-rotating outer cylinder relative to the rotating core shaft, the lower radial righting sliding friction pair transmits the radial pushing force from the supporting ribs received by the lower end of the non-rotating outer cylinder to the output end of the rotating core shaft, and the lower axial thrust sliding friction pair limits the downward movement of the outer cylinder of the rotating guide short section relative to the rotating core shaft of the rotating guide short section; for the lower radial righting sliding friction pair and the upper axial thrust sliding friction pair subjected to larger forces, the sum of the friction surface areas of multiple friction parts is increased to reduce the contact stress of the sliding friction pair; at the same time, for the lower axial thrust sliding friction pair and the upper radial righting sliding friction pair subjected to smaller forces, the sum of the friction surface areas of multiple friction parts is reduced to increase the contact stress of the sliding friction pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of a sliding bearing assembly of a drilling system;

[0027] Figure 2It is a schematic diagram of the structure of an upper rotor assembly;

[0028] Figure 3 It is a schematic diagram of the structure of a lower rotor assembly;

[0029] Figure 4 It is a schematic diagram of the structure of an upper radial straightening sliding bearing rotor;

[0030] Figure 5 It is a schematic diagram of the structure of a rotor with a lower radial straightening sliding bearing;

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of an upper stator assembly;

[0032] Figure 7 It is a schematic diagram of the cross-sectional structure of a lower stator assembly;

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of the upper stator assembly;

[0034] Fig. 9 It is a three-dimensional structural schematic diagram of the lower stator assembly;

[0035] Fig.10 It is a schematic diagram of the cross-sectional structure of the first ring body of the stator base of an upper radial straightening sliding bearing;

[0036] Fig.11 It is a schematic diagram of the cross-sectional structure of the first ring body of the stator base of a lower radial straightening sliding bearing;

[0037] Fig.12 It is a schematic diagram of an upper axial thrust sliding bearing rotor;

[0038] Fig.13 It is a schematic diagram of the cross-sectional structure of an upper axial thrust sliding bearing rotor;

[0039] Fig.14 It is a schematic diagram of the cross-sectional structure of the rotor base of an upper axial thrust sliding bearing;

[0040] Fig.15 It is a schematic diagram of the cross-sectional structure of the stator base body of an upper axial thrust sliding bearing;

[0041] Fig.16 It is a schematic diagram of the cross-sectional structure of the stator of an upper axial thrust sliding bearing;

[0042] Fig.17 It is a schematic diagram of an upper axial thrust sliding bearing stator;

[0043] Fig.18 It is a schematic diagram of the cross-sectional structure of a rotor base of a lower axial thrust sliding bearing;

[0044] Fig.19It is a schematic diagram of the cross-sectional structure of a rotor of a lower axial thrust sliding bearing;

[0045] Fig. 20 It is a schematic diagram of a rotor with a lower axial thrust sliding bearing;

[0046] Fig.21 It is a schematic diagram of a lower axial thrust sliding bearing stator;

[0047] Fig. 22 It is a schematic diagram of the cross-sectional structure of a stator of a lower axial thrust sliding bearing;

[0048] Fig.23 It is a schematic diagram of the cross-sectional structure of a stator base body of a lower axial thrust sliding bearing;

[0049] Fig.24 It is a schematic diagram of the cross-sectional structure of the friction part of a convex-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0050] Fig.25 It is a schematic diagram of the cross-sectional structure of the friction part of a concave chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0051] Fig.26 It is a schematic diagram of the friction part of a convex chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0052] Fig. 27 It is a schematic diagram of the friction part of a concave chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0053] Fig.28 It is another schematic diagram of the cross-sectional structure of the friction part of a convex-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0054] Fig.29 It is a schematic diagram of the cross-sectional structure of another concave chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC) friction part;

[0055] Fig.30 It is a schematic diagram of the cross-sectional structure of the friction part of a plane-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0056] Fig.31 It is a schematic diagram of the cross-sectional structure of the friction part of a plane-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0057] Fig.32 It is a schematic diagram of the friction part structure of a flat-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0058] Fig.33It is a schematic diagram of the friction part structure of a flat-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0059] Fig.34 It is a schematic diagram of the cross-sectional structure of another friction part of a plane-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0060] Fig.35 It is a schematic diagram of the cross-sectional structure of another friction part of a plane-edge chamfered cylindrical sheet of polycrystalline diamond and cemented carbide composite (PDC);

[0061] Fig.36 It is another schematic diagram of the cross-sectional structure of the sliding bearing assembly of the drilling system;

[0062] Fig.37 It is another schematic diagram of the structure of the upper radial straightening sliding bearing rotor;

[0063] Fig.38 It is a schematic diagram of another rotor structure of a lower radial straightening sliding bearing;

[0064] Fig.39 is another schematic diagram of the cross-sectional structure of the upper stator assembly;

[0065] Fig.40 It is another schematic diagram of the cross-sectional structure of the lower stator assembly.

[0066] The reference numerals of the above drawings are as follows:

[0067] 1. Upper rotor assembly; 11. Upper radial straightening sliding bearing rotor; 111. Upper radial straightening sliding bearing rotor base; 112. First radial straightening sliding friction portion; 1121. Upper rotor radial polycrystalline diamond; 1122. Upper rotor radial cemented carbide base; 12. Upper axial thrust sliding bearing rotor; 121. Upper axial thrust sliding bearing rotor base; 122. First axial thrust sliding friction portion; 1221. Upper rotor axial polycrystalline diamond; 1222. Upper rotor axial cemented carbide base;

[0068] 2. Upper stator assembly; 21. Upper radial straightening sliding bearing stator; 211. Upper radial straightening sliding bearing stator matrix; 2111. Upper radial rubber damping sleeve; 2112. Upper radial straightening sliding bearing stator matrix first ring body; 2113. Upper radial straightening sliding bearing stator matrix second ring body; 212. Second radial straightening sliding friction part; 2121. Upper stator radial polycrystalline diamond; 2122. Upper stator radial cemented carbide matrix; 22. Upper axial thrust sliding bearing stator; 221. Upper axial thrust sliding bearing stator matrix; 222. Second axial thrust sliding friction part; 2221. Upper stator axial polycrystalline diamond; 2222. Upper stator axial cemented carbide matrix;

[0069] 3. Lower rotor assembly; 31. Lower radial centering sliding bearing rotor; 311. Lower radial centering sliding bearing rotor base; 312. Third radial centering sliding friction portion; 3121. Lower rotor radial polycrystalline diamond; 3122. Lower rotor radial cemented carbide base; 32. Lower axial thrust sliding bearing rotor; 321. Lower axial thrust sliding bearing rotor base; 322. Third axial thrust sliding friction portion; 3221. Lower rotor axial polycrystalline diamond; 3222. Lower rotor axial cemented carbide base;

[0070] 4. Lower stator assembly; 41. Lower radial straightening sliding bearing stator; 411. Lower radial straightening sliding bearing stator matrix; 4111. Lower radial rubber damping sleeve; 4112. Lower radial straightening sliding bearing stator matrix first ring body; 4113. Lower radial straightening sliding bearing stator matrix second ring body; 412. Fourth radial straightening sliding friction part; 4121. Lower stator radial polycrystalline diamond; 4122. Lower stator radial cemented carbide matrix; 42. Lower axial thrust sliding bearing stator; 421. Lower axial thrust sliding bearing stator matrix; 422. Fourth axial thrust sliding friction part; 4221. Lower stator axial polycrystalline diamond; 4222. Lower stator axial cemented carbide matrix;

[0071] R1, the arc radius of the outer convex surface of the friction part of the cylindrical polycrystalline diamond and cemented carbide composite (PDC); R2, the arc radius of the inner concave surface of the friction part of the cylindrical polycrystalline diamond and cemented carbide composite (PDC);

[0072] D, installation diameter of cylindrical sheet friction part; d, effective diameter of cylindrical sheet friction part; H, total height of cylindrical sheet friction part; h, thickness of polycrystalline diamond layer; c, chamfer distance of friction part edge; α, chamfer angle of friction part edge;

[0073] L1, first axial spacing; L2, second axial spacing; L3, third axial spacing; L4, fourth axial spacing;

[0074] S1, first axial length; S2, second axial length; S3, third axial length; S4, fourth axial length. DETAILED DESCRIPTION

[0075] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0076] It should be noted that when an element is referred to as "including" another element, it may "include but not limited to" another element, that is, it may "include" another element and other more elements. When an element is referred to as "disposed on" another element, it may be directly on the other element or there may be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0078] Please refer to Figures 1 to 40 The utility model provides a drilling system sliding bearing assembly, including: an upper radial straightening sliding friction pair, an upper axial thrust sliding friction pair; a lower radial straightening sliding friction pair, and a lower axial thrust sliding friction pair.

[0079] The upper radial righting sliding friction pair includes an upper radial righting sliding bearing rotor 11 and an upper radial righting sliding bearing stator 21; the upper axial thrust sliding friction pair includes an upper axial thrust sliding bearing rotor 12 and an upper axial thrust sliding bearing stator 22; the lower radial righting sliding friction pair includes a lower radial righting sliding bearing rotor 31 and a lower radial righting sliding bearing stator 41; the lower axial thrust sliding friction pair includes a lower axial thrust sliding bearing rotor 32 and a lower axial thrust sliding bearing stator 42.

[0080] The upper radial straightening sliding bearing rotor 11 includes an upper radial straightening sliding bearing rotor base 111 and a first radial straightening sliding friction portion 112; the upper radial straightening sliding bearing stator 21 includes an upper radial straightening sliding bearing stator base 211 and a second radial straightening sliding friction portion 212; the upper radial straightening sliding bearing stator base 211 includes an upper radial rubber vibration damping sleeve 2111, an upper radial straightening sliding bearing stator base first ring body 2112 and an upper radial straightening sliding bearing stator base second ring body 2113 (upper bearing seat).

[0081] The upper axial thrust sliding bearing rotor 12 comprises an upper axial thrust sliding bearing rotor base 121 and a first axial thrust sliding friction portion 122 ; the upper axial thrust sliding bearing stator 22 comprises an upper axial thrust sliding bearing stator base 221 and a second axial thrust sliding friction portion 222 .

[0082] The material of the first radial straightening sliding friction portion 112 is the same as the material of the second radial straightening sliding friction portion 212, but the sum of the friction surface areas of the first radial straightening sliding friction portion 112 is not equal to the sum of the friction surface areas of the second radial straightening sliding friction portion 212; the material of the first axial thrust sliding friction portion 122 is the same as the material of the second axial thrust sliding friction portion 222, but the sum of the friction surface areas of the first axial thrust sliding friction portion 122 is not equal to the sum of the friction surface areas of the second axial thrust sliding friction portion 222.

[0083] The lower radial centering sliding bearing rotor 31 includes a lower radial centering sliding bearing rotor base 311 and a third radial centering sliding friction portion 312; the lower radial centering sliding bearing stator 41 includes a lower radial centering sliding bearing stator base 411 and a fourth radial centering sliding friction portion 412; the lower radial centering sliding bearing stator base 411 includes a lower radial rubber vibration damping sleeve 4111, a lower radial centering sliding bearing stator base first ring body 4112 and a lower radial centering sliding bearing stator base second ring body 4113 (lower bearing seat).

[0084] The lower axial thrust sliding bearing rotor 32 includes a lower axial thrust sliding bearing rotor base 321 and a third axial thrust sliding friction portion 322 ; the lower axial thrust sliding bearing stator 42 includes a lower axial thrust sliding bearing stator base 421 and a fourth axial thrust sliding friction portion 422 .

[0085] The material of the third radial straightening sliding friction portion 312 is the same as that of the fourth radial straightening sliding friction portion 412, but the sum of the friction surface areas of the third radial straightening sliding friction portion 312 is not equal to the sum of the friction surface areas of the fourth radial straightening sliding friction portion 412; the material of the third axial thrust sliding friction portion 322 is the same as that of the fourth axial thrust sliding friction portion 422, but the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is not equal to the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422.

[0086] In a preferred embodiment, the material of the second radial straightening sliding friction part 212 is the same as that of the fourth radial straightening sliding friction part 412 , but the sum of the friction surface areas of the second radial straightening sliding friction part 212 is not equal to the sum of the friction surface areas of the fourth radial straightening sliding friction part 412 .

[0087] In a preferred embodiment, the material of the second axial thrust sliding friction portion 222 is the same as that of the fourth axial thrust sliding friction portion 422 , but the sum of the friction surface areas of the second axial thrust sliding friction portion 222 is not equal to the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422 .

[0088] In a preferred embodiment, the material of the first radial straightening sliding friction part 112, the material of the second radial straightening sliding friction part 212, the material of the third radial straightening sliding friction part 312 and the material of the fourth radial straightening sliding friction part 412 are the same, but the sum of the friction surface areas of the fourth radial straightening sliding friction part 412 is greater than the sum of the friction surface areas of the third radial straightening sliding friction part 312, the sum of the friction surface areas of the third radial straightening sliding friction part 312 is equal to the sum of the friction surface areas of the first radial straightening sliding friction part 112, and the sum of the friction surface areas of the first radial straightening sliding friction part 112 is greater than the sum of the friction surface areas of the second radial straightening sliding friction part 212.

[0089] In a preferred embodiment, the material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, but the sum of the friction surface areas of the second axial thrust sliding friction portion 222 is greater than the sum of the friction surface areas of the first axial thrust sliding friction portion 122, the sum of the friction surface areas of the first axial thrust sliding friction portion 122 is equal to the sum of the friction surface areas of the third axial thrust sliding friction portion 322, and the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422.

[0090] In a preferred embodiment, the material of the first radial straightening sliding friction portion 112, the material of the second radial straightening sliding friction portion 212, the material of the third radial straightening sliding friction portion 312, the material of the fourth radial straightening sliding friction portion 412, the material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, and are all polycrystalline diamond and cemented carbide composite (PDC) friction portions, or polycrystalline diamond (PCD) friction portions.

[0091] In this embodiment, the first radial righting sliding friction portion 112 is divided into 1 to 3 circles and is evenly arranged without staggering or evenly staggered around the circumference on the outer cylindrical surface of the upper radial righting sliding bearing rotor base 111; the second radial righting sliding friction portion 212 is divided into 1 to 3 circles and is evenly arranged without staggering or evenly staggered around the circumference on the inner cylindrical surface of the upper radial righting sliding bearing stator base 211; the third radial righting sliding friction portion 312 is divided into 2 to 3 circles and is evenly arranged without staggering or evenly staggered around the circumference on the outer cylindrical surface of the lower radial righting sliding bearing rotor base 311; the fourth radial righting sliding friction portion 412 is divided into 2 to 3 circles and is evenly arranged without staggering around the circumference. The radially straightening sliding friction parts are staggered or circumferentially uniformly staggered on the inner cylindrical surface of the stator base 411 of the lower radial straightening sliding bearing; the first axial spacing L1 of the first radial straightening sliding friction part is equal to the second axial spacing L2 of the second radial straightening sliding friction part; the third axial spacing L3 of the third radial straightening sliding friction part is equal to the fourth axial spacing L4 of the fourth radial straightening sliding friction part; the first axial spacing L1 is 10.0mm-100.0mm, the second axial spacing L2 is 10.0mm-100.0mm, the third axial spacing L3 is 10.0mm-100.0mm, and the fourth axial spacing L4 is 10.0mm-100.0mm.

[0092] In a preferred embodiment, the first radial righting sliding friction portion 112 is divided into 2 circles that are uniformly circumferentially without staggering (the 2 circles of friction portions are respectively uniformly distributed circumferentially and aligned up and down) or divided into 2 circles that are uniformly staggered circumferentially (the 2 circles of friction portions are respectively uniformly distributed circumferentially and evenly staggered up and down) and is arranged on the outer cylindrical surface of the upper radial righting sliding bearing rotor base 111; the second radial righting sliding friction portion 212 is divided into 2 circles that are uniformly circumferentially without staggering (the 2 circles of friction portions are respectively uniformly distributed circumferentially and aligned up and down) or divided into 2 circles that are uniformly staggered circumferentially (the 2 circles of friction portions are respectively uniformly distributed circumferentially and evenly staggered up and down) and is arranged on the inner cylindrical surface of the upper radial righting sliding bearing stator base 211; the third radial righting sliding friction portion 312 is divided into 2 circles that are uniformly circumferentially without staggering (the 2 circles of friction portions are respectively uniformly distributed circumferentially and aligned up and down) or divided into 2 circles that are uniformly staggered circumferentially (the 2 circles of friction portions are respectively uniformly distributed circumferentially and evenly staggered up and down) The fourth radial righting sliding friction portion 412 is arranged on the outer cylindrical surface of the rotor base 311 of the lower radial righting sliding bearing in two circles, which are uniformly distributed in the circumference without staggering (the two circles of friction portions are respectively uniformly distributed in the circumference and aligned up and down) or are arranged on the inner cylindrical surface of the stator base 411 of the lower radial righting sliding bearing in two circles, which are uniformly distributed in the circumference (the two circles of friction portions are respectively uniformly distributed in the circumference and uniformly staggered in the upper and lower directions); the first axial spacing L1 of the first radial righting sliding friction portion is equal to the second axial spacing L2 of the second radial righting sliding friction portion; the third axial spacing L3 of the third radial righting sliding friction portion is equal to the fourth axial spacing L4 of the fourth radial righting sliding friction portion; the first axial spacing L1=66.0mm; the second axial spacing L2=66.0mm; the third axial spacing L3=66.0mm; the fourth axial spacing L4=66.0mm.

[0093] In a preferred embodiment, the material of the first radial straightening sliding friction portion 112, the material of the second radial straightening sliding friction portion 212, the material of the third radial straightening sliding friction portion 312 and the material of the fourth radial straightening sliding friction portion 412 are the same, all of which are cemented carbide (TC) friction portions; the material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, all of which are polycrystalline diamond and cemented carbide composite (PDC) friction portions, or polycrystalline diamond (PCD) friction portions.

[0094] In this embodiment, the first radial straightening sliding friction portion 112 is arranged on the outer cylindrical surface of the upper radial straightening sliding bearing rotor base 111, the second radial straightening sliding friction portion 212 is arranged on the inner cylindrical surface of the upper radial straightening sliding bearing stator base 211, the third radial straightening sliding friction portion 312 is arranged on the outer cylindrical surface of the lower radial straightening sliding bearing rotor base 311, and the fourth radial straightening sliding friction portion 412 is arranged on the inner cylindrical surface of the lower radial straightening sliding bearing stator base 411; the first radial straightening sliding friction portion The first axial length S1 of the third radial straightening sliding friction portion is equal to the second axial length S2 of the second radial straightening sliding friction portion, the third axial length S3 of the third radial straightening sliding friction portion is equal to the fourth axial length S4 of the fourth radial straightening sliding friction portion; the first axial length S1=30.0mm-120.0mm; the second axial length S2=30.0mm-120.0mm; the third axial length S3=30.0mm-120.0mm; the fourth axial length S4=30.0mm-120.0mm.

[0095] In a preferred embodiment, the cross-sectional shape of the cemented carbide (TC) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and sector shape, or / and polygonal; the cross-sectional shape of the polycrystalline diamond (PCD) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and sector shape, or / and polygonal; the cross-sectional shape of the polycrystalline diamond and cemented carbide composite (PDC) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and sector shape, or / and polygonal.

[0096] In the preferred embodiment of the present application, two pairs of radial straightening sliding friction pairs and two pairs of axial thrust sliding friction pairs are simultaneously arranged in a sliding bearing assembly, so as to limit the inclination angle and axial displacement of the rotating core shaft of the rotating guide short section relative to the axis of the non-rotating outer cylinder of the rotating guide short section, thereby improving the concentricity and working stability of the rotating core shaft and the non-rotating outer cylinder to a certain extent.

[0097] In general, in a drilling system sliding bearing assembly provided by the present application:

[0098] The materials of the first radial straightening sliding friction part 112 , the second radial straightening sliding friction part 212 , the third radial straightening sliding friction part 312 and the fourth radial straightening sliding friction part 412 are the same, which are all chamfered polycrystalline diamond and cemented carbide composite (PDC) friction parts or cemented carbide friction parts.

[0099] The materials of the first axial thrust sliding friction portion 122 , the second axial thrust sliding friction portion 222 , the third axial thrust sliding friction portion 322 and the fourth axial thrust sliding friction portion 422 are the same, which are all chamfered polycrystalline diamond and cemented carbide composite (PDC) friction portions or chamfered polycrystalline diamond (PCD) friction portions.

[0100] The sum of the friction surface areas of the fourth radial straightening sliding friction parts 412 is greater than the sum of the friction surface areas of the third radial straightening sliding friction parts 312, the sum of the friction surface areas of the third radial straightening sliding friction parts 312 is equal to or greater than the sum of the friction surface areas of the first radial straightening sliding friction parts 112, and the sum of the friction surface areas of the first radial straightening sliding friction parts 112 is greater than the sum of the friction surface areas of the second radial straightening sliding friction parts 212.

[0101] The sum of the friction surface areas of the second axial thrust sliding friction parts 222 is greater than the sum of the friction surface areas of the first axial thrust sliding friction parts 122, the sum of the friction surface areas of the first axial thrust sliding friction parts 122 is equal to or greater than the sum of the friction surface areas of the third axial thrust sliding friction parts 322, and the sum of the friction surface areas of the third axial thrust sliding friction parts 322 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction parts 422.

[0102] In this way, in a drilling system sliding bearing assembly provided by the present application, the friction surface area of ​​the lower radial righting sliding friction pair subjected to greater force increases to a certain extent, and the friction surface area of ​​the upper radial righting sliding friction pair subjected to less force decreases to a large extent, so that the difference in contact stress between the lower radial righting sliding friction pair subjected to greater force and the contact stress between the upper radial righting sliding friction pair subjected to less force decreases; the friction surface area of ​​the upper axial thrust sliding friction pair subjected to greater force increases to a certain extent, and the friction surface area of ​​the lower axial thrust sliding friction pair subjected to less force decreases to a large extent, so that the difference in contact stress between the upper axial thrust sliding friction pair subjected to greater force and the contact stress between the lower axial thrust sliding friction pair subjected to less force decreases.

[0103] In the following different preferred embodiments, different preferred embodiments are developed and elaborated in detail mainly according to the specific composition, structure, parameters, etc. of the upper rotor assembly 1, the upper stator assembly 2, the lower rotor assembly 3 and the lower stator assembly 4.

[0104] See also Figures 1 to 35 A preferred embodiment 1 provides a drilling system sliding bearing assembly, including an upper rotor assembly 1, an upper stator assembly 2, a lower rotor assembly 3 and a lower stator assembly 4.

[0105] The upper rotor assembly 1 includes: an upper radial straightening sliding bearing rotor 11 and an upper axial thrust sliding bearing rotor 12; the upper radial straightening sliding bearing rotor 11 includes an upper radial straightening sliding bearing rotor base 111 and a first radial straightening sliding friction portion 112; the upper axial thrust sliding bearing rotor 12 includes an upper axial thrust sliding bearing rotor base 121 and a first axial thrust sliding friction portion 122.

[0106] The upper stator assembly 2 includes: an upper radial straightening sliding bearing stator 21, an upper axial thrust sliding bearing stator 22; the upper radial straightening sliding bearing stator 21 includes an upper radial straightening sliding bearing stator base 211 and a second radial straightening sliding friction portion 212; the upper radial straightening sliding bearing stator base 211 includes an upper radial rubber vibration damping sleeve 2111, an upper radial straightening sliding bearing stator base first ring body 2112 and an upper radial straightening sliding bearing stator base second ring body 2113; the upper axial thrust sliding bearing stator 22 includes an upper axial thrust sliding bearing stator base 221 and a second axial thrust sliding friction portion 222.

[0107] The upper radial centering sliding friction pair includes an upper radial centering sliding bearing rotor 11 and an upper radial centering sliding bearing stator 21 ; the upper axial thrust sliding friction pair includes an upper axial thrust sliding bearing rotor 12 and an upper axial thrust sliding bearing stator 22 .

[0108] The material of the first radial straightening sliding friction portion 112 is the same as that of the second radial straightening sliding friction portion 212, but the sum of the friction surface areas of the first radial straightening sliding friction portion 112 is greater than the sum of the friction surface areas of the second radial straightening sliding friction portion 212; the material of the first axial thrust sliding friction portion 122 is the same as that of the second axial thrust sliding friction portion 222, but the sum of the friction surface areas of the first axial thrust sliding friction portion 122 is less than the sum of the friction surface areas of the second axial thrust sliding friction portion 222.

[0109] The lower rotor assembly 3 includes: a lower radial centering sliding bearing rotor 31 and a lower axial thrust sliding bearing rotor 32; the lower radial centering sliding bearing rotor 31 includes a lower radial centering sliding bearing rotor base 311 and a third radial centering sliding friction portion 312; the lower axial thrust sliding bearing rotor 32 includes a lower axial thrust sliding bearing rotor base 321 and a third axial thrust sliding friction portion 322.

[0110] The lower stator assembly 4 includes: a lower radial centering sliding bearing stator 41 and a lower axial thrust sliding bearing stator 42; the lower radial centering sliding bearing stator 41 includes a lower radial centering sliding bearing stator base 411 and a fourth radial centering sliding friction portion 412; the lower radial centering sliding bearing stator base 411 includes a lower radial rubber vibration damping sleeve 4111, a first ring body 4112 of a lower radial centering sliding bearing stator base and a second ring body 4113 of a lower radial centering sliding bearing stator base; the lower axial thrust sliding bearing stator 42 includes a lower axial thrust sliding bearing stator base 421 and a fourth axial thrust sliding friction portion 422.

[0111] The lower radial centering sliding friction pair includes a lower radial centering sliding bearing rotor 31 and a lower radial centering sliding bearing stator 41 ; the lower axial thrust sliding friction pair includes a lower axial thrust sliding bearing rotor 32 and a lower axial thrust sliding bearing stator 42 .

[0112] The material of the third radial straightening sliding friction portion 312 is the same as that of the fourth radial straightening sliding friction portion 412, but the sum of the friction surface areas of the third radial straightening sliding friction portion 312 is smaller than the sum of the friction surface areas of the fourth radial straightening sliding friction portion 412; the material of the third axial thrust sliding friction portion 322 is the same as that of the fourth axial thrust sliding friction portion 422, but the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is larger than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422.

[0113] The material of the second radially centering sliding friction portion 212 is the same as that of the fourth radially centering sliding friction portion 412 , but the total friction surface area of ​​the second radially centering sliding friction portion 212 is smaller than the total friction surface area of ​​the fourth radially centering sliding friction portion 412 .

[0114] The material of the second axial thrust sliding friction portion 222 is the same as that of the fourth axial thrust sliding friction portion 422 , but the total friction surface area of ​​the second axial thrust sliding friction portion 222 is greater than the total friction surface area of ​​the fourth axial thrust sliding friction portion 422 .

[0115] The material of the first radial straightening sliding friction part 112, the material of the second radial straightening sliding friction part 212, the material of the third radial straightening sliding friction part 312 and the material of the fourth radial straightening sliding friction part 412 are the same, but the sum of the friction surface areas of the fourth radial straightening sliding friction part 412 is greater than the sum of the friction surface areas of the third radial straightening sliding friction part 312, the sum of the friction surface areas of the third radial straightening sliding friction part 312 is equal to the sum of the friction surface areas of the first radial straightening sliding friction part 112, and the sum of the friction surface areas of the first radial straightening sliding friction part 112 is greater than the sum of the friction surface areas of the second radial straightening sliding friction part 212.

[0116] The material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, but the sum of the friction surface areas of the second axial thrust sliding friction portion 222 is greater than the sum of the friction surface areas of the first axial thrust sliding friction portion 122, the sum of the friction surface areas of the first axial thrust sliding friction portion 122 is equal to the sum of the friction surface areas of the third axial thrust sliding friction portion 322, and the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422.

[0117] The material of the first radial straightening sliding friction portion 112, the material of the second radial straightening sliding friction portion 212, the material of the third radial straightening sliding friction portion 312, the material of the fourth radial straightening sliding friction portion 412, the material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, all of which are cylindrical sheet-shaped polycrystalline diamond and cemented carbide composite (PDC) friction portions.

[0118] like Figures 4 to 8 As shown, the first radial righting sliding friction part 112 is divided into two circles and evenly staggered in the circumferential direction (the two circles of friction parts are respectively evenly distributed in the circumferential direction, and the upper and lower circumferential directions are evenly staggered) and is arranged on the outer cylindrical surface of the upper radial righting sliding bearing rotor base 111; the second radial righting sliding friction part 212 is divided into two circles and evenly staggered in the circumferential direction (the two circles of friction parts are respectively evenly distributed in the circumferential direction, and the upper and lower circumferential directions are evenly staggered) and is arranged on the inner cylindrical surface of the upper radial righting sliding bearing stator base 211; the third radial righting sliding friction part 312 is divided into two circles and evenly staggered in the circumferential direction (the two circles of friction parts are respectively evenly distributed in the circumferential direction, and the upper and lower circumferential directions are evenly staggered) and is arranged on the outer cylindrical surface of the lower radial righting sliding bearing rotor base 311; The fourth radial righting sliding friction portion 412 is divided into two circles that are evenly staggered in the circumferential direction (the two circles of friction portions are evenly distributed in the circumferential direction, and are evenly staggered in the upper and lower directions) and is arranged on the inner cylindrical surface of the stator base 411 of the lower radial righting sliding bearing; the first axial spacing L1 of the first radial righting sliding friction portion is equal to the second axial spacing L2 of the second radial righting sliding friction portion; the third axial spacing L3 of the third radial righting sliding friction portion is equal to the fourth axial spacing L4 of the fourth radial righting sliding friction portion; the first axial spacing L1=66.0mm, the second axial spacing L2=66.0mm, the third axial spacing L3=66.0mm, and the fourth axial spacing L4=66.0mm.

[0119] In the first preferred embodiment, the upper rotor assembly 1 and the lower rotor assembly 3 have the same structure and parameters, while the upper stator assembly 2 and the lower stator assembly 4 have different structures and parameters. Specifically, the upper rotor assembly 1 is similar to the lower rotor assembly 3 in that: the sum of the friction surface areas of the first radial straightening sliding friction part 112 of the upper rotor assembly 1 is equal to the sum of the friction surface areas of the third radial straightening sliding friction part 312 of the lower rotor assembly 3, and the sum of the friction surface areas of the first axial thrust sliding friction part 122 of the upper rotor assembly 1 is equal to the sum of the friction surface areas of the third axial thrust sliding friction part 322 of the lower rotor assembly 3; the upper stator assembly 2 is different from the lower stator assembly 4 in that: the sum of the friction surface areas of the second radial straightening sliding friction part 212 of the upper stator assembly 2 is less than the sum of the friction surface areas of the fourth radial straightening sliding friction part 412 of the lower stator assembly 4, and the sum of the friction surface areas of the second axial thrust sliding friction part 222 of the upper stator assembly 2 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction part 422 of the lower stator assembly 4.

[0120] In the above preferred embodiment 1, the specific parameters of the 8 types of friction parts of the sliding bearing assembly of a certain type of rotary steering drilling system are as follows:

[0121] The number of the first radially correcting sliding friction parts 112 is 42, and the structural parameters of the PDC friction part (see Fig.24 , Fig.26 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 112 friction surface area = 175.50mm 2 The total friction surface area of ​​42 friction parts and 112 friction surfaces = 7371.00 mm 2 ;

[0122] The number of the second radially straightening sliding friction parts 212 is 24, and the structural parameters of the PDC friction part (see Fig.25 , Fig. 27 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 212 friction surface area = 172.34mm 2 The total friction surface area of ​​24 friction parts 212 = 4136.16 mm 2 ;

[0123] The number of the third radial straightening sliding friction parts 312 is 42, and the structural parameters of the PDC friction part (see Fig.26 , Fig.28): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 312 friction surface area = 175.50mm 2 The total friction surface area of ​​42 friction parts 312 = 7371.00mm 2 ;

[0124] The number of the fourth radially correcting sliding friction parts 412 is 44, and the structural parameters of the PDC friction part (see Fig. 27 , Fig.29 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 412 friction surface area = 172.34mm 2 The total friction surface area of ​​44 friction parts 412 = 7582.96mm 2 ;

[0125] The number of the first axial thrust sliding friction parts 122 is 29, and the structural parameters of the PDC friction part (see Fig.30 , Fig.32 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 122 friction surface area = 167.415mm 2 The total friction surface area of ​​29 friction parts 122 = 4855.04mm 2 ;

[0126] The number of the second axial thrust sliding friction parts 222 is 30, and the structural parameters of the PDC friction part (see Fig.31 , Fig.33 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 222 friction surface area = 167.415mm 2 The total friction surface area of ​​30 friction parts 222 = 5022.45mm 2 ;

[0127] The number of the third axial thrust sliding friction parts 322 is 29, and the structural parameters of the PDC friction part (see Fig.32 , Fig.34 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.2mm, c = 0.50mm, α = 45°, 1 friction part 322 friction surface area = 167.415mm2 The total friction surface area of ​​29 friction parts 322 = 4855.04mm 2 ;

[0128] The number of the fourth axial thrust sliding friction parts 422 is 11, and the structural parameters of the PDC friction part (see Fig.33 , Fig.35 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 422 friction surface area = 167.415mm 2 The total friction surface area of ​​11 friction parts 422 = 1841.57mm 2 .

[0129] The above parameters show that the preferred embodiment 1 of the sliding bearing assembly of the rotary steerable drilling system is:

[0130] The total friction surface area of ​​the fourth radial righting sliding friction part 412 is greater than the total friction surface area of ​​the third radial righting sliding friction part 312. The friction surface area of ​​the lower radial righting sliding friction pair is 7371.00 mm 2 The sum of the friction surface areas of the third radial righting sliding friction part 312 is equal to the sum of the friction surface areas of the first radial righting sliding friction part 112; the sum of the friction surface areas of the first radial righting sliding friction part 112 is greater than the sum of the friction surface areas of the second radial righting sliding friction part 212, and the friction surface area of ​​the upper radial righting sliding friction pair is 4136.16mm 2 .

[0131] The total friction surface area of ​​the second axial thrust sliding friction part 222 is greater than the total friction surface area of ​​the first axial thrust sliding friction part 122, and the friction surface area of ​​the upper axial thrust sliding friction pair is 4855.04mm 2 The sum of the friction surface areas of the first axial thrust sliding friction portion 122 is equal to the sum of the friction surface areas of the third axial thrust sliding friction portion 322; the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422, and the friction surface area of ​​the lower axial thrust sliding friction pair is 1841.57mm 2 .

[0132] It should be noted that in the prior art of the sliding bearing assembly of this type of rotary steerable drilling system, the specific parameters of the eight types of friction parts are as follows:

[0133] The number of the first radially correcting sliding friction parts 112 is 40, and the structural parameters of the PDC friction part (see Fig.24 , Fig.26): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 112 friction surface area = 175.50mm 2 The total friction surface area of ​​40 friction parts 112 = 7020.00mm 2 ;

[0134] The number of the second radially correcting sliding friction parts 212 is 42, and the structural parameters of the PDC friction part (see Fig. 27 , Fig.29 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 412 friction surface area = 172.34mm 2 The total friction surface area of ​​42 friction parts 412 = 7238.28mm 2 ;

[0135] The number of the third radial straightening sliding friction parts 312 is 40, and the structural parameters of the PDC friction part (see Fig.26 , Fig.28 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 312 friction surface area = 175.50mm 2 The total friction surface area of ​​40 friction parts 312 = 7020.00mm 2 ;

[0136] The number of the fourth radial straightening sliding friction parts 412 is 42, and the structural parameters of the PDC friction part (see Fig. 27 , Fig.29 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 412 friction surface area = 172.34mm 2 The total friction surface area of ​​42 friction parts 412 = 7238.28mm 2 ;

[0137] The number of the first axial thrust sliding friction parts 122 is 27, and the structural parameters of the PDC friction part (see Fig.30 , Fig.32): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 122 friction surface area = 167.415mm 2 The total friction surface area of ​​27 friction parts 122 = 4520.21mm 2 ;

[0138] The number of the second axial thrust sliding friction parts 222 is 28, and the structural parameters of the PDC friction part (see Fig.31 , Fig.33 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 222 friction surface area = 167.415mm 2 The total friction surface area of ​​28 friction parts 222 = 4687.62 mm 2 ;

[0139] The number of the third axial thrust sliding friction parts 322 is 27, and the structural parameters of the PDC friction part (see Fig.30 , Fig.32 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 122 friction surface area = 167.415mm 2 The total friction surface area of ​​27 friction parts 122 = 4520.21mm 2 ;

[0140] The number of the fourth axial thrust sliding friction parts 422 is 28, and the structural parameters of the PDC friction part (see Fig.31 , Fig.33 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 222 friction surface area = 167.415mm 2 The total friction surface area of ​​28 friction parts 222 = 4687.62 mm 2 .

[0141] The above parameters show that the existing technology of sliding bearing assembly of this type of rotary steerable drilling system:

[0142] The total friction surface area of ​​the fourth radial righting sliding friction part 412 is greater than the total friction surface area of ​​the third radial righting sliding friction part 312. The friction surface area of ​​the lower radial righting sliding friction pair is 7020.00mm 2The sum of the friction surface areas of the second radially correcting sliding friction portion 212 is greater than the sum of the friction surface areas of the first radially correcting sliding friction portion 112, and the friction surface area of ​​the upper radially correcting sliding friction pair is 7020.00mm 2 The sum of the friction surface areas of the fourth radial straightening sliding friction portion 412 is equal to the sum of the friction surface areas of the second radial straightening sliding friction portion 212, and the sum of the friction surface areas of the third radial straightening sliding friction portion 312 is equal to the sum of the friction surface areas of the first radial straightening sliding friction portion 112.

[0143] The total friction surface area of ​​the fourth axial thrust sliding friction part 422 is greater than the total friction surface area of ​​the third axial thrust sliding friction part 322, and the friction surface area of ​​the lower axial thrust sliding friction pair is 4520.21mm 2 The total friction surface area of ​​the second axial thrust sliding friction portion 222 is greater than the total friction surface area of ​​the first axial thrust sliding friction portion 122, and the friction surface area of ​​the upper axial thrust sliding friction pair is 4520.21mm 2 The sum of the friction surface areas of the fourth axial thrust sliding friction portion 422 is equal to the sum of the friction surface areas of the second axial thrust sliding friction portion 222, and the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is equal to the sum of the friction surface areas of the first axial thrust sliding friction portion 122.

[0144] By comparing the features of the first preferred embodiment of the sliding bearing assembly of the rotary steerable drilling system with the features of the prior art of the sliding bearing assembly of the rotary steerable drilling system, it is found that:

[0145] 1. The friction surface area of ​​the upper axial thrust sliding friction pair of the preferred embodiment 1 is 4855.04mm 2 The friction surface area of ​​the upper axial thrust sliding friction pair in the prior art is 4520.21mm 2 The former is 334.83mm longer than the latter 2 , increased by 7.41%; under the condition of unchanged axial force (external force), the contact stress of the upper axial thrust sliding friction pair of the preferred implementation mode one is reduced by 7.41% compared with the contact stress of the upper axial thrust sliding friction pair of the prior art.

[0146] 2. The friction surface area of ​​the lower axial thrust sliding friction pair of the preferred embodiment 1 is 1841.57 mm 2 The friction surface area of ​​the lower axial thrust sliding friction pair in the prior art is 4520.21mm 2 The former is 2678.64 mm shorter than the latter 2 , reduced by 59.26%; under the condition of unchanged axial force (external force), the contact stress of the upper axial thrust sliding friction pair of the preferred implementation mode one is increased by 59.26% compared with the contact stress of the upper axial thrust sliding friction pair of the prior art.

[0147] 3. The friction surface area of ​​the upper radial straightening sliding friction pair of the preferred embodiment 1 is 4136.16 mm 2 The friction surface area of ​​the upper axial thrust sliding friction pair in the prior art is 7020.00mm 2 The former is 2883.84 mm shorter than the latter 2 , reduced by 41.08%; under the condition that the radial force (external force) remains unchanged, the contact stress of the upper radial righting sliding friction pair of the preferred implementation mode one is increased by 41.08% compared with the contact stress of the upper radial righting sliding friction pair of the prior art.

[0148] 4. The friction surface area of ​​the lower radial straightening sliding friction pair of the preferred embodiment 1 is 7371.00 mm 2 The friction surface area of ​​the upper axial thrust sliding friction pair in the prior art is 7020.00mm 2 , the former is 351.00 mm longer than the latter 2 , increased by 5.00%; under the condition that the radial force (external force) remains unchanged, the contact stress of the lower radial righting sliding friction pair of the preferred implementation mode one is reduced by 5.00% compared with the contact stress of the lower radial righting sliding friction pair of the prior art.

[0149] 5. In the preferred embodiment one, the number of the first radial straightening sliding friction parts 112 is 42, the number of the second radial straightening sliding friction parts 212 is 24, the number of the third radial straightening sliding friction parts 312 is 42, the number of the fourth radial straightening sliding friction parts 412 is 44, and the total is 152; the number of the first axial thrust sliding friction parts 122 is 29, the number of the second axial thrust sliding friction parts 222 is 30, the number of the third axial thrust sliding friction parts 322 is 29, the number of the fourth axial thrust sliding friction parts 422 is 11, and the total is 99; the total number of friction parts in the preferred embodiment one is 251. The number of the first radial straightening sliding friction parts 112 in the prior art is 40, the number of the second radial straightening sliding friction parts 212 is 42, the number of the third radial straightening sliding friction parts 312 is 40, the number of the fourth radial straightening sliding friction parts 412 is 42, and the total number is 164; the number of the first axial thrust sliding friction parts 122 is 27, the number of the second axial thrust sliding friction parts 222 is 28, the number of the third axial thrust sliding friction parts 322 is 27, the number of the fourth axial thrust sliding friction parts 422 is 28, and the total number is 110; the total number of friction parts in the prior art is 274. Therefore, the total number of friction parts in the preferred embodiment 1 is reduced by 23 compared with the total number of friction parts in the prior art, and the cost of purchasing friction parts is reduced by 8.39%.

[0150] See also Figures 1 to 35Preferred embodiment 2 provides a drilling system sliding bearing assembly, including an upper rotor assembly 1, an upper stator assembly 2, a lower rotor assembly 3 and a lower stator assembly 4.

[0151] The upper rotor assembly 1 includes: an upper radial straightening sliding bearing rotor 11 and an upper axial thrust sliding bearing rotor 12; the upper radial straightening sliding bearing rotor 11 includes an upper radial straightening sliding bearing rotor base 111 and a first radial straightening sliding friction portion 112; the upper axial thrust sliding bearing rotor 12 includes an upper axial thrust sliding bearing rotor base 121 and a first axial thrust sliding friction portion 122.

[0152] The upper stator assembly 2 includes: an upper radial straightening sliding bearing stator 21, an upper axial thrust sliding bearing stator 22; the upper radial straightening sliding bearing stator 21 includes an upper radial straightening sliding bearing stator base 211 and a second radial straightening sliding friction portion 212; the upper radial straightening sliding bearing stator base 211 includes an upper radial rubber vibration damping sleeve 2111, an upper radial straightening sliding bearing stator base first ring body 2112 and an upper radial straightening sliding bearing stator base second ring body 2113; the upper axial thrust sliding bearing stator 22 includes an upper axial thrust sliding bearing stator base 221 and a second axial thrust sliding friction portion 222.

[0153] The upper radial centering sliding friction pair includes an upper radial centering sliding bearing rotor 11 and an upper radial centering sliding bearing stator 21 ; the upper axial thrust sliding friction pair includes an upper axial thrust sliding bearing rotor 12 and an upper axial thrust sliding bearing stator 22 .

[0154] The material of the first radial straightening sliding friction portion 112 is the same as that of the second radial straightening sliding friction portion 212, but the sum of the friction surface areas of the first radial straightening sliding friction portion 112 is greater than the sum of the friction surface areas of the second radial straightening sliding friction portion 212; the material of the first axial thrust sliding friction portion 122 is the same as that of the second axial thrust sliding friction portion 222, but the sum of the friction surface areas of the first axial thrust sliding friction portion 122 is less than the sum of the friction surface areas of the second axial thrust sliding friction portion 222.

[0155] The lower rotor assembly 3 includes: a lower radial centering sliding bearing rotor 31 and a lower axial thrust sliding bearing rotor 32; the lower radial centering sliding bearing rotor 31 includes a lower radial centering sliding bearing rotor base 311 and a third radial centering sliding friction portion 312; the lower axial thrust sliding bearing rotor 32 includes a lower axial thrust sliding bearing rotor base 321 and a third axial thrust sliding friction portion 322.

[0156] The lower stator assembly 4 includes: a lower radial centering sliding bearing stator 41 and a lower axial thrust sliding bearing stator 42; the lower radial centering sliding bearing stator 41 includes a lower radial centering sliding bearing stator base 411 and a fourth radial centering sliding friction portion 412; the lower radial centering sliding bearing stator base 411 includes a lower radial rubber vibration damping sleeve 4111, a first ring body 4112 of a lower radial centering sliding bearing stator base and a second ring body 4113 of a lower radial centering sliding bearing stator base; the lower axial thrust sliding bearing stator 42 includes a lower axial thrust sliding bearing stator base 421 and a fourth axial thrust sliding friction portion 422.

[0157] The lower radial centering sliding friction pair includes a lower radial centering sliding bearing rotor 31 and a lower radial centering sliding bearing stator 41 ; the lower axial thrust sliding friction pair includes a lower axial thrust sliding bearing rotor 32 and a lower axial thrust sliding bearing stator 42 .

[0158] The material of the third radial straightening sliding friction portion 312 is the same as that of the fourth radial straightening sliding friction portion 412, but the sum of the friction surface areas of the third radial straightening sliding friction portion 312 is smaller than the sum of the friction surface areas of the fourth radial straightening sliding friction portion 412; the material of the third axial thrust sliding friction portion 322 is the same as that of the fourth axial thrust sliding friction portion 422, but the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is larger than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422.

[0159] The material of the second radially centering sliding friction portion 212 is the same as that of the fourth radially centering sliding friction portion 412 , but the total friction surface area of ​​the second radially centering sliding friction portion 212 is smaller than the total friction surface area of ​​the fourth radially centering sliding friction portion 412 .

[0160] The material of the second axial thrust sliding friction portion 222 is the same as that of the fourth axial thrust sliding friction portion 422 , but the total friction surface area of ​​the second axial thrust sliding friction portion 222 is greater than the total friction surface area of ​​the fourth axial thrust sliding friction portion 422 .

[0161] The material of the first radial straightening sliding friction part 112, the material of the second radial straightening sliding friction part 212, the material of the third radial straightening sliding friction part 312 and the material of the fourth radial straightening sliding friction part 412 are the same, but the sum of the friction surface areas of the fourth radial straightening sliding friction part 412 is greater than the sum of the friction surface areas of the third radial straightening sliding friction part 312, the sum of the friction surface areas of the third radial straightening sliding friction part 312 is greater than the sum of the friction surface areas of the first radial straightening sliding friction part 112, and the sum of the friction surface areas of the first radial straightening sliding friction part 112 is greater than the sum of the friction surface areas of the second radial straightening sliding friction part 212.

[0162] The material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, but the sum of the friction surface areas of the second axial thrust sliding friction portion 222 is greater than the sum of the friction surface areas of the first axial thrust sliding friction portion 122, the sum of the friction surface areas of the first axial thrust sliding friction portion 122 is greater than the sum of the friction surface areas of the third axial thrust sliding friction portion 322, and the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422.

[0163] The material of the first radial straightening sliding friction portion 112, the material of the second radial straightening sliding friction portion 212, the material of the third radial straightening sliding friction portion 312, the material of the fourth radial straightening sliding friction portion 412, the material of the first axial thrust sliding friction portion 122, the material of the second axial thrust sliding friction portion 222, the material of the third axial thrust sliding friction portion 322 and the material of the fourth axial thrust sliding friction portion 422 are the same, all of which are cylindrical sheet-shaped polycrystalline diamond and cemented carbide composite (PDC) friction portions.

[0164] like Figures 4 to 8 As shown, the first radial righting sliding friction part 112 is divided into two circles and evenly staggered in the circumferential direction (the two circles of friction parts are respectively evenly distributed in the circumferential direction, and the upper and lower circumferential directions are evenly staggered) and is arranged on the outer cylindrical surface of the upper radial righting sliding bearing rotor base 111; the second radial righting sliding friction part 212 is divided into two circles and evenly staggered in the circumferential direction (the two circles of friction parts are respectively evenly distributed in the circumferential direction, and the upper and lower circumferential directions are evenly staggered) and is arranged on the inner cylindrical surface of the upper radial righting sliding bearing stator base 211; the third radial righting sliding friction part 312 is divided into two circles and evenly staggered in the circumferential direction (the two circles of friction parts are respectively evenly distributed in the circumferential direction, and the upper and lower circumferential directions are evenly staggered) and is arranged on the outer cylindrical surface of the lower radial righting sliding bearing rotor base 311; The fourth radial righting sliding friction portion 412 is divided into two circles that are evenly staggered in the circumferential direction (the two circles of friction portions are evenly distributed in the circumferential direction, and are evenly staggered in the upper and lower directions) and is arranged on the inner cylindrical surface of the stator base 411 of the lower radial righting sliding bearing; the first axial spacing L1 of the first radial righting sliding friction portion is equal to the second axial spacing L2 of the second radial righting sliding friction portion; the third axial spacing L3 of the third radial righting sliding friction portion is equal to the fourth axial spacing L4 of the fourth radial righting sliding friction portion; the first axial spacing L1=66.0mm, the second axial spacing L2=66.0mm, the third axial spacing L3=66.0mm, and the fourth axial spacing L4=66.0mm.

[0165] In the second preferred embodiment, the structures and parameters of the upper rotor assembly 1 and the lower rotor assembly 3 are different, and the structures and parameters of the upper stator assembly 2 and the lower stator assembly 4 are also different. Specifically, the difference between the upper rotor assembly 1 and the lower rotor assembly 3 is that: the sum of the friction surface areas of the first radial straightening sliding friction part 112 of the upper rotor assembly 1 is smaller than the sum of the friction surface areas of the third radial straightening sliding friction part 312 of the lower rotor assembly 3, and the sum of the friction surface areas of the first axial thrust sliding friction part 122 of the upper rotor assembly 1 is greater than the sum of the friction surface areas of the third axial thrust sliding friction part 322 of the lower rotor assembly 3; the difference between the upper stator assembly 2 and the lower stator assembly 4 is that: the sum of the friction surface areas of the second radial straightening sliding friction part 212 of the upper stator assembly 2 is smaller than the sum of the friction surface areas of the fourth radial straightening sliding friction part 412 of the lower stator assembly 4, and the sum of the friction surface areas of the second axial thrust sliding friction part 222 of the upper stator assembly 2 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction part 422 of the lower stator assembly 4.

[0166] In the above preferred embodiment 2, the specific parameters of the 8 types of friction parts of the sliding bearing assembly of a certain type of rotary steerable drilling system are as follows:

[0167] The number of the first radial straightening sliding friction parts 112 is 38, and the structural parameters of the PDC friction part (see Fig.24 , Fig.26 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 112 friction surface area = 175.50mm 2 The total friction surface area of ​​38 friction parts and 112 = 6669.00 mm 2 ;

[0168] The number of the second radially straightening sliding friction parts 212 is 24, and the structural parameters of the PDC friction part (see Fig.25 , Fig. 27 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 212 friction surface area = 172.34mm 2 The total friction surface area of ​​24 friction parts 212 = 4136.16 mm 2 ;

[0169] The number of the third radial straightening sliding friction parts 312 is 42, and the structural parameters of the PDC friction part (see Fig.26 , Fig.28): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 312 friction surface area = 175.50mm 2 The total friction surface area of ​​42 friction parts 312 = 7371.00mm 2 ;

[0170] The number of the fourth radially correcting sliding friction parts 412 is 44, and the structural parameters of the PDC friction part (see Fig. 27 , Fig.29 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 03mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 412 friction surface area = 172.34mm 2 The total friction surface area of ​​44 friction parts 412 = 7582.96mm 2 ;

[0171] The number of the first axial thrust sliding friction parts 122 is 29, and the structural parameters of the PDC friction part (see Fig.30 , Fig.32 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 122 friction surface area = 167.415mm 2 The total friction surface area of ​​29 friction parts 122 = 4855.04mm 2 ;

[0172] The number of the second axial thrust sliding friction parts 222 is 30, and the structural parameters of the PDC friction part (see Fig.31 , Fig.33 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 222 friction surface area = 167.415mm 2 The total friction surface area of ​​30 friction parts 222 = 5022.45mm 2 ;

[0173] The number of the third axial thrust sliding friction parts 322 is 28, and the structural parameters of the PDC friction part (see Fig.32 , Fig.34 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 322 friction surface area = 167.415mm2 The total friction surface area of ​​28 friction parts 322 = 4687.62mm 2 ;

[0174] The number of the fourth axial thrust sliding friction parts 422 is 11, and the structural parameters of the PDC friction part (see Fig.33 , Fig.35 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 422 friction surface area = 167.415mm 2 The total friction surface area of ​​11 friction parts 422 = 1841.57mm 2 .

[0175] The above parameters show that the preferred embodiment 2 of the sliding bearing assembly of the rotary steerable drilling system is:

[0176] The total friction surface area of ​​the fourth radial righting sliding friction part 412 is greater than the total friction surface area of ​​the third radial righting sliding friction part 312. The friction surface area of ​​the lower radial righting sliding friction pair is 7371.00 mm 2 The sum of the friction surface areas of the third radial righting sliding friction part 312 is greater than the sum of the friction surface areas of the first radial righting sliding friction part 112, the sum of the friction surface areas of the first radial righting sliding friction part 112 is greater than the sum of the friction surface areas of the second radial righting sliding friction part 212, and the friction surface area of ​​the upper radial righting sliding friction pair is 4136.16mm 2 .

[0177] The total friction surface area of ​​the second axial thrust sliding friction part 222 is greater than the total friction surface area of ​​the first axial thrust sliding friction part 122, and the friction surface area of ​​the upper axial thrust sliding friction pair is 4855.04mm 2 The sum of the friction surface areas of the first axial thrust sliding friction portion 122 is greater than the sum of the friction surface areas of the third axial thrust sliding friction portion 322; the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction portion 422, and the friction surface area of ​​the lower axial thrust sliding friction pair is 1841.57mm 2 .

[0178] It should be noted that in the prior art of the sliding bearing assembly of this type of rotary steerable drilling system, the specific parameters of the eight types of friction parts are as follows:

[0179] The number of the first radially correcting sliding friction parts 112 is 40, and the structural parameters of the PDC friction part (see Fig.24 , Fig.26): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 112 friction surface area = 175.50mm 2 The total friction surface area of ​​40 friction parts 112 = 7020.00mm 2 ;

[0180] The number of the second radially correcting sliding friction parts 212 is 42, and the structural parameters of the PDC friction part (see Fig. 27 , Fig.29 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 412 friction surface area = 172.34mm 2 The total friction surface area of ​​42 friction parts 412 = 7238.28mm 2 ;

[0181] The number of the third radial straightening sliding friction parts 312 is 40, and the structural parameters of the PDC friction part (see Fig.26 , Fig.28 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R1 = 69.875mm, 1 friction part 312 friction surface area = 175.50mm 2 The total friction surface area of ​​40 friction parts 312 = 7020.00mm 2 ;

[0182] The number of the fourth radial straightening sliding friction parts 412 is 42, and the structural parameters of the PDC friction part (see Fig. 27 , Fig.29 ): D = 16.20mm, d = 12.736mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 1.00mm, α = 30°, R2 = 70.05mm, 1 friction part 412 friction surface area = 172.34mm 2 The total friction surface area of ​​42 friction parts 412 = 7238.28mm 2 ;

[0183] The number of the first axial thrust sliding friction parts 122 is 27, and the structural parameters of the PDC friction part (see Fig.30 , Fig.32): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 122 friction surface area = 167.415mm 2 The total friction surface area of ​​27 friction parts 122 = 4520.21mm 2 ;

[0184] The number of the second axial thrust sliding friction parts 222 is 28, and the structural parameters of the PDC friction part (see Fig.31 , Fig.33 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 222 friction surface area = 167.415mm 2 The total friction surface area of ​​28 friction parts 222 = 4687.62 mm 2 ;

[0185] The number of the third axial thrust sliding friction parts 322 is 27, and the structural parameters of the PDC friction part (see Fig.30 , Fig.32 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 122 friction surface area = 167.415mm 2 The total friction surface area of ​​27 friction parts 122 = 4520.21mm 2 ;

[0186] The number of the fourth axial thrust sliding friction parts 422 is 28, and the structural parameters of the PDC friction part (see Fig.31 , Fig.33 ): D = 15.60mm, d = 14.60mm, H = 5.50mm, h = 2.2 ± 0.3mm, c = 0.50mm, α = 45°, 1 friction part 222 friction surface area = 167.415mm 2 The total friction surface area of ​​28 friction parts 222 = 4687.62 mm 2 .

[0187] The above parameters show that the existing technology of sliding bearing assembly of this type of rotary steerable drilling system:

[0188] The total friction surface area of ​​the fourth radial righting sliding friction part 412 is greater than the total friction surface area of ​​the third radial righting sliding friction part 312. The friction surface area of ​​the lower radial righting sliding friction pair is 7020.00mm 2The sum of the friction surface areas of the second radially correcting sliding friction portion 212 is greater than the sum of the friction surface areas of the first radially correcting sliding friction portion 112, and the friction surface area of ​​the upper radially correcting sliding friction pair is 7020.00mm 2 The sum of the friction surface areas of the fourth radial straightening sliding friction portion 412 is equal to the sum of the friction surface areas of the second radial straightening sliding friction portion 212, and the sum of the friction surface areas of the third radial straightening sliding friction portion 312 is equal to the sum of the friction surface areas of the first radial straightening sliding friction portion 112.

[0189] The total friction surface area of ​​the fourth axial thrust sliding friction part 422 is greater than the total friction surface area of ​​the third axial thrust sliding friction part 322, and the friction surface area of ​​the lower axial thrust sliding friction pair is 4520.21mm 2 The total friction surface area of ​​the second axial thrust sliding friction portion 222 is greater than the total friction surface area of ​​the first axial thrust sliding friction portion 122, and the friction surface area of ​​the upper axial thrust sliding friction pair is 4520.21mm 2 The sum of the friction surface areas of the fourth axial thrust sliding friction portion 422 is equal to the sum of the friction surface areas of the second axial thrust sliding friction portion 222, and the sum of the friction surface areas of the third axial thrust sliding friction portion 322 is equal to the sum of the friction surface areas of the first axial thrust sliding friction portion 122.

[0190] By comparing the features of the second preferred embodiment of the sliding bearing assembly of the rotary steerable drilling system with the features of the prior art of the sliding bearing assembly of the rotary steerable drilling system, it is found that:

[0191] 1. The friction surface area of ​​the upper axial thrust sliding friction pair of the preferred embodiment 2 is 4855.04mm 2 The friction surface area of ​​the upper axial thrust sliding friction pair in the prior art is 4520.21mm 2 The former is 334.83mm longer than the latter 2 , increased by 7.41%; under the condition of unchanged axial force (external force), the contact stress of the upper axial thrust sliding friction pair of the preferred implementation mode 2 is reduced by 7.41% compared with the contact stress of the upper axial thrust sliding friction pair of the prior art.

[0192] 2. The friction surface area of ​​the lower axial thrust sliding friction pair of the preferred embodiment 2 is 1841.57 mm 2 The friction surface area of ​​the lower axial thrust sliding friction pair in the prior art is 4520.21mm 2 The former is 2678.64 mm shorter than the latter 2 , reduced by 59.26%; under the condition of unchanged axial force (external force), the contact stress of the upper axial thrust sliding friction pair of the preferred implementation mode 2 is increased by 59.26% compared with the contact stress of the upper axial thrust sliding friction pair of the prior art.

[0193] 3. The friction surface area of ​​the upper radial straightening sliding friction pair of the preferred embodiment 2 is 4136.16 mm 2 The friction surface area of ​​the upper axial thrust sliding friction pair in the prior art is 7020.00mm 2 The former is 2883.84 mm shorter than the latter 2 , reduced by 41.08%; under the condition of unchanged radial force (external force), the contact stress of the upper radial righting sliding friction pair of the preferred implementation mode 2 is increased by 41.08% compared with the contact stress of the upper radial righting sliding friction pair of the prior art.

[0194] 4. The friction surface area of ​​the lower radial straightening sliding friction pair of the preferred embodiment 2 is 7371.00 mm 2 The friction surface area of ​​the upper axial thrust sliding friction pair in the prior art is 7020.00mm 2 , the former is 351.00 mm longer than the latter 2 , increased by 5.00%; under the condition that the radial force (external force) remains unchanged, the contact stress of the lower radial righting sliding friction pair of the preferred implementation mode 2 is reduced by 5.00% compared with the contact stress of the lower radial righting sliding friction pair of the prior art.

[0195] 5. In the preferred embodiment 2, the number of the first radial straightening sliding friction parts 112 is 38, the number of the second radial straightening sliding friction parts 212 is 24, the number of the third radial straightening sliding friction parts 312 is 42, the number of the fourth radial straightening sliding friction parts 412 is 44, and the total is 148; the number of the first axial thrust sliding friction parts 122 is 29, the number of the second axial thrust sliding friction parts 222 is 30, the number of the third axial thrust sliding friction parts 322 is 28, the number of the fourth axial thrust sliding friction parts 422 is 11, and the total is 98; the total number of friction parts in the preferred embodiment 2 is 246. The number of the first radial straightening sliding friction parts 112 in the prior art is 40, the number of the second radial straightening sliding friction parts 212 is 42, the number of the third radial straightening sliding friction parts 312 is 40, the number of the fourth radial straightening sliding friction parts 412 is 42, and the total number is 164; the number of the first axial thrust sliding friction parts 122 is 27, the number of the second axial thrust sliding friction parts 222 is 28, the number of the third axial thrust sliding friction parts 322 is 27, the number of the fourth axial thrust sliding friction parts 422 is 28, and the total number is 110; the total number of friction parts in the prior art is 274. Therefore, the total number of friction parts in the preferred embodiment 2 is reduced by 28 compared with the total number of friction parts in the prior art, and the cost of purchasing friction parts is reduced by 10.22%.

[0196] The similarities and differences between the preferred implementation mode 1 and the preferred implementation mode 2 are briefly analyzed below.

[0197] The difference between the preferred embodiment 1 and the preferred embodiment 2 is that:

[0198] In the preferred embodiment 1, the structures and parameters of the upper rotor assembly 1 and the lower rotor assembly 3 are the same (the sum of the friction surface areas of the first radial righting sliding friction part 112 of the upper rotor assembly 1 is equal to the sum of the friction surface areas of the third radial righting sliding friction part 312 of the lower rotor assembly 3, and the sum of the friction surface areas of the first axial thrust sliding friction part 122 of the upper rotor assembly 1 is equal to the sum of the friction surface areas of the third axial thrust sliding friction part 322 of the lower rotor assembly 3). In the preferred embodiment 2, the structures and parameters of the upper rotor assembly 1 and the lower rotor assembly 3 are different (the sum of the friction surface areas of the first radial righting sliding friction part 112 of the upper rotor assembly 1 is less than the sum of the friction surface areas of the third radial righting sliding friction part 312 of the lower rotor assembly 3, and the sum of the friction surface areas of the first axial thrust sliding friction part 122 of the upper rotor assembly 1 is greater than the sum of the friction surface areas of the third axial thrust sliding friction part 322 of the lower rotor assembly 3).

[0199] The similarities between the preferred embodiment 1 and the preferred embodiment 2 are as follows:

[0200] In the preferred embodiment 1, the upper stator assembly 2 is different from the lower stator assembly 4 (the sum of the friction surface areas of the second radial righting sliding friction part 212 of the upper stator assembly 2 is smaller than the sum of the friction surface areas of the fourth radial righting sliding friction part 412 of the lower stator assembly 4, and the sum of the friction surface areas of the second axial thrust sliding friction part 222 of the upper stator assembly 2 is larger than the sum of the friction surface areas of the fourth axial thrust sliding friction part 422 of the lower stator assembly 4). In the preferred embodiment 2, the upper stator assembly 2 is also different from the lower stator assembly 4 (the sum of the friction surface areas of the second radial righting sliding friction part 212 of the upper stator assembly 2 is smaller than the sum of the friction surface areas of the fourth radial righting sliding friction part 412 of the lower stator assembly 4, and the sum of the friction surface areas of the second axial thrust sliding friction part 222 of the upper stator assembly 2 is larger than the sum of the friction surface areas of the fourth axial thrust sliding friction part 422 of the lower stator assembly 4).

[0201] Compared with the preferred embodiment 2, the preferred embodiment 1 has more obvious advantages and can better match the actual force size of the friction pairs of the sliding bearing assembly 4 of the rotary steerable drilling system or the vertical drilling system; however, during design, processing and assembly, the upper rotor assembly 1, the upper stator assembly 2, the lower rotor assembly 3 and the lower stator assembly 4 need to be strictly distinguished.

[0202] In addition, in the drawings of this embodiment, 1121 is the radial polycrystalline diamond of the upper rotor, 1122 is the radial cemented carbide substrate of the upper rotor, 1221 is the axial polycrystalline diamond of the upper rotor, 1222 is the axial cemented carbide substrate of the upper rotor, 2121 is the radial polycrystalline diamond of the upper stator, 2122 is the radial cemented carbide substrate of the upper stator, 2221 is the axial polycrystalline diamond of the upper stator, and 2222 is the axial cemented carbide substrate of the upper stator; 3121 is the radial polycrystalline diamond of the lower rotor, 3122 is the radial cemented carbide substrate of the lower rotor, and 3221 is the axial polycrystalline diamond of the lower rotor; 3222 is the axial cemented carbide substrate of the lower rotor, 4121 is the radial polycrystalline diamond of the lower stator, 4122 is the radial cemented carbide substrate of the lower stator, 4221 is the axial polycrystalline diamond of the lower stator, and 4222 is the axial cemented carbide substrate of the lower stator; it will not be repeated in this article.

[0203] It should be noted that, in the description of this application, the terms "first", "second", "upper", "lower", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0204] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0205] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A drilling system sliding bearing assembly, characterized in that: include: an upper radially centering sliding friction pair, and a lower radially centering sliding friction pair; The upper radial centering sliding friction pair includes an upper radial centering sliding bearing rotor and an upper radial centering sliding bearing stator; the lower radial centering sliding friction pair includes a lower radial centering sliding bearing rotor and a lower radial centering sliding bearing stator; The upper radial centering sliding bearing rotor comprises an upper radial centering sliding bearing rotor base and a first radial centering sliding friction portion; the upper radial centering sliding bearing stator comprises an upper radial centering sliding bearing stator base and a second radial centering sliding friction portion; The material of the first radial centralizing sliding friction portion is the same as that of the second radial centralizing sliding friction portion, but the sum of the friction surface areas of the first radial centralizing sliding friction portion is not equal to the sum of the friction surface areas of the second radial centralizing sliding friction portion; The lower radial centering sliding bearing rotor comprises a lower radial centering sliding bearing rotor base and a third radial centering sliding friction portion; the lower radial centering sliding bearing stator comprises a lower radial centering sliding bearing stator base and a fourth radial centering sliding friction portion; The material of the third radial righting sliding friction portion is the same as that of the fourth radial righting sliding friction portion, but the sum of the friction surface areas of the third radial righting sliding friction portion is not equal to the sum of the friction surface areas of the fourth radial righting sliding friction portion.

2. The drilling system sliding bearing assembly according to claim 1, characterized in that: It also includes: an upper axial thrust sliding friction pair, and a lower axial thrust sliding friction pair; The upper axial thrust sliding friction pair includes an upper axial thrust sliding bearing rotor and an upper axial thrust sliding bearing stator; the lower axial thrust sliding friction pair includes a lower axial thrust sliding bearing rotor and a lower axial thrust sliding bearing stator; The upper axial thrust sliding bearing rotor comprises an upper axial thrust sliding bearing rotor base and a first axial thrust sliding friction portion; the upper axial thrust sliding bearing stator comprises an upper axial thrust sliding bearing stator base and a second axial thrust sliding friction portion; The material of the first axial thrust sliding friction portion is the same as that of the second axial thrust sliding friction portion, but the sum of the friction surface areas of the first axial thrust sliding friction portion is not equal to the sum of the friction surface areas of the second axial thrust sliding friction portion; The lower axial thrust sliding bearing rotor comprises a lower axial thrust sliding bearing rotor base and a third axial thrust sliding friction portion; the lower axial thrust sliding bearing stator comprises a lower axial thrust sliding bearing stator base and a fourth axial thrust sliding friction portion; The material of the third axial thrust sliding friction portion is the same as that of the fourth axial thrust sliding friction portion, but the sum of the friction surface areas of the third axial thrust sliding friction portion is not equal to the sum of the friction surface areas of the fourth axial thrust sliding friction portion.

3. The drilling system sliding bearing assembly according to claim 2, characterized in that: The material of the second radial righting sliding friction portion is the same as that of the fourth radial righting sliding friction portion, and the sum of the friction surface areas of the second radial righting sliding friction portion is not equal to the sum of the friction surface areas of the fourth radial righting sliding friction portion; The material of the second axial thrust sliding friction portion is the same as that of the fourth axial thrust sliding friction portion, and the sum of the friction surface areas of the second axial thrust sliding friction portion is not equal to the sum of the friction surface areas of the fourth axial thrust sliding friction portion.

4. The drilling system sliding bearing assembly according to claim 3, characterized in that: The material of the first radial righting sliding friction part, the material of the second radial righting sliding friction part, the material of the third radial righting sliding friction part and the material of the fourth radial righting sliding friction part are the same, the sum of the friction surface areas of the fourth radial righting sliding friction part is greater than the sum of the friction surface areas of the third radial righting sliding friction part, the sum of the friction surface areas of the third radial righting sliding friction part is equal to the sum of the friction surface areas of the first radial righting sliding friction part, and the sum of the friction surface areas of the first radial righting sliding friction part is greater than the sum of the friction surface areas of the second radial righting sliding friction part.

5. The drilling system sliding bearing assembly according to claim 3, characterized in that: The material of the first axial thrust sliding friction part, the material of the second axial thrust sliding friction part, the material of the third axial thrust sliding friction part and the material of the fourth axial thrust sliding friction part are the same, but the sum of the friction surface areas of the second axial thrust sliding friction part is greater than the sum of the friction surface areas of the first axial thrust sliding friction part, the sum of the friction surface areas of the first axial thrust sliding friction part is equal to the sum of the friction surface areas of the third axial thrust sliding friction part, and the sum of the friction surface areas of the third axial thrust sliding friction part is greater than the sum of the friction surface areas of the fourth axial thrust sliding friction part.

6. The drilling system sliding bearing assembly according to claim 3, characterized in that: The material of the first radial straightening sliding friction portion, the material of the second radial straightening sliding friction portion, the material of the third radial straightening sliding friction portion, the material of the fourth radial straightening sliding friction portion, the material of the first axial thrust sliding friction portion, the material of the second axial thrust sliding friction portion, the material of the third axial thrust sliding friction portion and the material of the fourth axial thrust sliding friction portion are the same, and are all polycrystalline diamond and cemented carbide composite (PDC) friction portions, or polycrystalline diamond (PCD) friction portions.

7. The drilling system sliding bearing assembly according to claim 3, characterized in that: The first radial righting sliding friction part is divided into 1-3 circles, which are evenly arranged without staggering or evenly staggered in the circumference on the outer cylindrical surface of the upper radial righting sliding bearing rotor base; the second radial righting sliding friction part is divided into 1-3 circles, which are evenly arranged without staggering or evenly staggered in the circumference on the inner cylindrical surface of the upper radial righting sliding bearing stator base; the third radial righting sliding friction part is divided into 2-3 circles, which are evenly arranged without staggering or evenly staggered in the circumference on the outer cylindrical surface of the lower radial righting sliding bearing rotor base; the fourth radial righting sliding friction part is divided into 2-3 circles, which are evenly arranged without staggering or evenly staggered in the circumference It is staggeredly arranged on the inner cylindrical surface of the stator base of the lower radial righting sliding bearing; the first axial spacing of the first radial righting sliding friction part is equal to the second axial spacing of the second radial righting sliding friction part; the third axial spacing of the third radial righting sliding friction part is equal to the fourth axial spacing of the fourth radial righting sliding friction part; the first axial spacing is 10.0mm-100.0mm, the second axial spacing is 10.0mm-100.0mm, the third axial spacing is 10.0mm-100.0mm, and the fourth axial spacing is 10.0mm-100.0mm.

8. The drilling system sliding bearing assembly according to claim 3, characterized in that: The material of the first radial straightening sliding friction portion, the material of the second radial straightening sliding friction portion, the material of the third radial straightening sliding friction portion and the material of the fourth radial straightening sliding friction portion are the same, all of which are cemented carbide (TC) friction portions; the material of the first axial thrust sliding friction portion, the material of the second axial thrust sliding friction portion, the material of the third axial thrust sliding friction portion and the material of the fourth axial thrust sliding friction portion are the same, all of which are polycrystalline diamond and cemented carbide composite (PDC) friction portions, or polycrystalline diamond (PCD) friction portions.

9. The drilling system sliding bearing assembly according to claim 8, characterized in that: The first radial righting sliding friction portion is arranged on the outer cylindrical surface of the upper radial righting sliding bearing rotor base, the second radial righting sliding friction portion is arranged on the inner cylindrical surface of the upper radial righting sliding bearing stator base, the third radial righting sliding friction portion is arranged on the outer cylindrical surface of the lower radial righting sliding bearing rotor base, and the fourth radial righting sliding friction portion is arranged on the inner cylindrical surface of the lower radial righting sliding bearing stator base; the first axial length of the first radial righting sliding friction portion is equal to the second axial length of the second radial righting sliding friction portion, and the third axial length of the third radial righting sliding friction portion is equal to the fourth axial length of the fourth radial righting sliding friction portion; the first axial length is 30.0mm-120.0mm, the second axial length is 30.0mm-120.0mm, the third axial length is 30.0mm-120.0mm, and the fourth axial length is 30.0mm-120.0mm.

10. The drilling system sliding bearing assembly according to claim 8, characterized in that: The cross-sectional shape of the cemented carbide (TC) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and fan-shaped, or / and polygonal; the cross-sectional shape of the polycrystalline diamond (PCD) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and fan-shaped, or / and polygonal; the cross-sectional shape of the polycrystalline diamond and cemented carbide composite (PDC) friction portion is circular, or / and elliptical, or / and double round head key shape, or / and fan-shaped, or / and polygonal.

Images