CN211693221U

CN211693221U - PDC bearing for downhole tool

Info

Publication number: CN211693221U
Application number: CN201922103152.5U
Authority: CN
Inventors: 张军锋; 宋朝晖; 李晓军; 罗维; 陈嘉陵; 王飞跃; 石晓刚; 武琳娜
Original assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Current assignee: China National Petroleum Corp; CNPC Xibu Drilling Engineering Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-10-16
Anticipated expiration: 2029-11-29

Abstract

The utility model relates to a translation door technical field is a PDC bearing for downhole tool, including endotheca, overcoat, roll cover, radial cushion collar, axial cushion collar, outer tooth group and interior tooth group, the endotheca right part outside is equipped with rather than coaxial overcoat, is equipped with radial cushion collar and roll cover from outer to interior in proper order between the overcoat inboard and the endotheca outside, and the roll cover left end is located the overcoat left, and roll cover inboard left and right interval distribution has two at least outer tooth groups. The utility model has the advantages of reasonable and compact structure, convenient to use through setting up axial cushion collar and radial cushion collar, can slow down radial impact and the vibration that comes from the overcoat, avoids left wear pad and right wear pad fracture damage, also can avoid interior PDC tooth and outer PDC tooth fracture damage, through PDC tooth and outer PDC tooth in setting up, loss when can increasing relative rotation between endotheca and the rolling sleeve reduces the failure rate, prolongs the utility model discloses a life.

Description

PDC bearing for downhole tool

Technical Field

The utility model relates to a carbide stove technical field is a PDC bearing for instrument in pit.

Background

The failure phenomenon of the oil drilling and production tool often occurs in the drilling and production construction process, and the failure analysis is carried out on the oil drilling and production tool, and a large part of the failure analysis is found to be caused by the failure of the bearing. The problems of excessive abrasion of the PDC bearing, breakage of a PDC composite sheet and the like occur due to the fact that the work is under complex conditions of high temperature, high pressure, vibration, impact and the like; in addition, the underground high-temperature and high-pressure environment can also influence the performance of the PDC bearing; the high temperature can cause the deformation of the bearing and the expansion of materials, so that the play of the bearing is changed, and the service life of the bearing is further influenced; under the high-pressure working condition, due to the fact that the preload is large, the bearing is seriously abraded, and the service life of the bearing is greatly reduced.

Disclosure of Invention

The utility model provides a PDC bearing for instrument in pit has overcome above-mentioned prior art not enough, and it can effectively solve the oil drilling and adopts, and vibration, impact and high temperature high pressure lead to the problem that the bearing failure rate is high, the life-span is short.

The technical scheme of the utility model is realized through following measure: a PDC bearing for a downhole tool comprises an inner sleeve, an outer sleeve, a rolling sleeve, a radial buffer sleeve, an axial buffer sleeve, an outer tooth group and an inner tooth group, wherein the outer side of the right part of the inner sleeve is provided with the outer sleeve coaxial with the inner sleeve, the radial buffer sleeve and the rolling sleeve are sequentially arranged between the inner side of the outer sleeve and the outer side of the inner sleeve from outside to inside, the left end of the rolling sleeve is positioned on the left side of the outer sleeve, the left side and the right side of the inner side of the rolling sleeve are provided with at least two outer tooth groups at intervals, each outer tooth group comprises at least three cylindrical outer PDC teeth at intervals along the circumference, the outer side of each inner tooth group is provided with an inner tooth group corresponding to the outer tooth group, each inner tooth group comprises at least three cylindrical inner PDC teeth at intervals along the circumference, the inner PDC teeth of two adjacent inner tooth groups are arranged in a staggered manner, the outer end surface of each inner PDC tooth group is contacted with the inner end surface of the outer PDC tooth group at the, the outer side of the radial buffer sleeve is fixedly connected with the inner side of the outer sleeve in a vulcanization mode, the outer side of the left end of the outer sleeve is sleeved with the axial buffer sleeve, and the inner side of the left part of the axial buffer sleeve is fixedly installed with the outer side of the left part of the rolling sleeve.

The following are further optimization or/and improvement of the technical scheme of the utility model:

the axial buffer sleeve can comprise an inner arc surface ring sleeve and a support ring, a first outer ring platform is fixed on the outer side of the left part of the outer sleeve, an arc surface ring platform is fixed on the outer side of the left end of the outer sleeve corresponding to the left side of the first outer ring platform, the arc surface ring platform is a ring platform with the outer ring in a shape of a narrow left arc and a wide right arc, a space is formed between the right end face and the left end face of the first outer ring platform in a sealing and sleeving manner, an arc inner arc hole matched with the outer arc surface of the arc surface ring platform is formed inside the inner arc surface ring sleeve, a buffer space capable of enabling the inner arc surface ring sleeve and the arc surface ring platform to move relatively in the axial direction is formed between the right end face inside the inner arc surface ring sleeve and the left end face of the arc surface ring platform, the support ring is fixed on the.

The bearing ring can also comprise a wear-resisting component, the left side of the support ring is provided with the wear-resisting component, the wear-resisting component comprises a left wear-resisting ring, a left wear-resisting paster, a right wear-resisting ring, a right wear-resisting paster and first countersunk bolts, the left end surface of the support ring is fixedly provided with the right wear-resisting ring sleeved outside the left end of the rolling sleeve, the right end surface of the right wear-resisting ring is uniformly distributed with at least three first threaded blind holes along the circumference, the left end of the support ring corresponding to the position of each first threaded blind hole is provided with a first connecting hole which is communicated with the left and the right, each first connecting hole is a stepped countersunk hole which is narrow at the left and wide at the right, each first countersunk bolt is arranged in each first connecting hole, the right bolt head of each first countersunk bolt is arranged in the wide-diameter section of the first connecting hole at the corresponding position, the left end of each first countersunk bolt passes through the narrow, at least three right wear-resistant patches are uniformly distributed on the left end face of the right wear-resistant ring at intervals along the circumference, a left wear-resistant ring is fixedly mounted on the outer side of the left part of the inner sleeve corresponding to the left position of the right wear-resistant ring, and a left wear-resistant patch corresponding to the right wear-resistant patch is fixedly mounted on the right end face of the left wear-resistant ring.

The device also comprises a second outer ring platform, a third outer ring platform, an oil injection plug and second countersunk head bolts, wherein the outer side of the left end of the inner sleeve is fixed with the second outer ring platform, the outer side of the left part of the inner sleeve corresponding to the right side position of the second outer ring platform is fixed with the third outer ring platform, the outer side of the third outer ring platform is in interference fit with the inner side of the left part of the left wear-resisting ring, the left end surface of the left wear-resisting ring is uniformly distributed with at least three second threaded blind holes along the circumference, the right end of the second outer ring platform corresponding to each second threaded blind hole is provided with a second connecting hole which is communicated with the left and the right, each second connecting hole is a stepped countersunk head hole which is wide at the left and narrow at the right, each second countersunk head bolt 12 is arranged in each second connecting hole, the left end bolt head of each second countersunk head bolt 12 is arranged in the wide section of the second connecting hole corresponding position, and the right end of each second countersunk head bolt 12 is fixedly arranged in the second threaded blind, the outer ring platform middle part outside of second that corresponds position between two adjacent second connecting holes has at least one inside and outside oil filler point that link up along the circumference equipartition, and equal fixed mounting has the oiling to block up in every oil filler point, corresponds the outer ring platform 17 outside of second of the right-hand position of oil filler point, the wear-resisting ring 13 outside of a left side and the wear-resisting ring 14 outside of a right side and all is equipped with the dismantlement annular.

The radial buffer sleeve can also comprise a left annular protrusion, a right annular protrusion and an outer annular protrusion, wherein the left annular protrusion is fixed on the outer side of the left end of the radial buffer sleeve, a left mounting clamping groove is formed in the inner side of the left end of the outer sleeve corresponding to the left annular protrusion, and the left annular protrusion is vulcanized and fixed in the left mounting clamping groove; a right annular protrusion is fixed on the outer side of the right end of the radial buffer sleeve, a right mounting clamping groove is formed in the inner side of the right end of the outer sleeve corresponding to the position of the right annular protrusion, and the right annular protrusion is vulcanized and fixed in the right mounting clamping groove; the outer side of the radial buffer sleeve corresponding to the position between the left annular protrusion and the right annular protrusion is provided with at least one outer annular protrusion at intervals, the inner side of the outer sleeve corresponding to the position of each outer annular protrusion is provided with a limiting ring groove, and each outer annular protrusion is vulcanized and fixed in the limiting ring groove corresponding to the position.

The device also comprises a left outer ring clamping table, a right outer ring clamping table and a connecting key, wherein the right outer ring clamping table is fixed on the outer side of the right end of the rolling sleeve, a space is arranged between the outer side of the right outer ring clamping table and the inner side of the right end of the outer sleeve corresponding to the position, the left end of the right outer ring clamping table and the right end of the radial buffer sleeve are vulcanized and fixedly connected together, a left outer ring clamping table is fixed on the outer side of the left part of the rolling sleeve corresponding to the left position of the radial buffer sleeve, a space is arranged between the right end surface of the support ring and the left end surface of the left outer ring clamping table, a first key groove with an upward opening is arranged on the upper side of the right part of the rolling sleeve corresponding to the position between the left outer ring clamping table and the right outer ring clamping table, a mounting hole which is vertically communicated with the radial buffer sleeve corresponding to the position of the first key groove is fixedly.

The sealing component can also comprise a sealing component, the sealing component comprises a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, the middle part of the inner sleeve is provided with a mounting hole, the mounting hole comprises a left conical hole section, a left straight hole section, a horn mouth section with a large left and a small right, a right straight hole section and a right conical hole section which are sequentially communicated together from left to right, a first sealing ring groove is arranged on the inner side of the inner sleeve corresponding to the middle position of the left straight hole section, a first sealing ring is arranged in the first sealing ring groove, at least one second key groove with an inward opening is uniformly distributed on the inner side of the inner sleeve corresponding to the left part of the right straight hole section along the circumference, a second sealing ring groove is formed in the right part of the right straight hole section, a second sealing ring is arranged in the second sealing ring groove, a third sealing ring groove is formed in the outer ring surface of the cambered surface ring platform, a third sealing ring is arranged in the third sealing ring groove, a fourth sealing ring groove is formed in the outer side of the right end of the outer sleeve, and a fourth sealing ring is arranged in the fourth sealing ring groove.

The aforesaid still can include locating component, locating component includes navigation key and rand, correspond and have at least one opening left and be the right side location keyway of long circle along the circumference equipartition on the support ring left end face of position between two adjacent second connecting holes, all be equipped with the left navigation key groove the same with right navigation key groove structure on the wear-resisting circle right-hand member face of right side corresponding every right navigation key groove position, all install the navigation key that the right part is located right navigation key groove in every left navigation key groove, right straight hole section right-hand member is equipped with the fixed ring groove, be equipped with the rand in the fixed ring groove.

The utility model has the advantages of reasonable and compact structure, convenient to use through setting up axial cushion collar and radial cushion collar, can slow down radial impact and the vibration that comes from the overcoat, avoids left wear pad and right wear pad fracture damage, also can avoid interior PDC tooth and outer PDC tooth fracture damage, through PDC tooth and outer PDC tooth in setting up, loss when can increasing relative rotation between endotheca and the rolling sleeve reduces the failure rate, prolongs the utility model discloses a life.

Drawings

Fig. 1 is a schematic sectional view of the preferred embodiment of the present invention.

FIG. 2 is an enlarged partial sectional view taken along line A-A of FIG. 1.

The codes in the figures are respectively: the structure comprises an inner sleeve 1, an outer sleeve 2, a rolling sleeve 3, a radial buffer sleeve 4, an outer PDC tooth 5, an inner PDC tooth 6, a first outer ring table 7, an arc ring table 8, an inner arc ring sleeve 9, a support ring 10, a first countersunk bolt 11, a second countersunk bolt 12, a left wear-resistant ring 13, a right wear-resistant ring 14, a left wear-resistant patch 15, a right wear-resistant patch 16, a second ring table 17, a third outer ring table 18, an oil filling plug 19, a left ring protrusion 20, a right ring protrusion 21, an outer ring protrusion 22, a left outer ring table 23, a right outer ring table 24, a retainer ring 25, a connecting key 26, a first seal ring 27, a second seal ring 28, a third seal ring 29, a fourth seal ring 30, a positioning key 31 and a disassembly ring groove 32.

Detailed Description

The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.

In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The invention will be further described with reference to the following examples and drawings:

as shown in attached figures 1 and 2, the PDC bearing for the downhole tool comprises an inner sleeve 1, an outer sleeve 2, a rolling sleeve 3, a radial buffer sleeve 4, an axial buffer sleeve, an outer tooth group and an inner tooth group, wherein the outer side of the right part of the inner sleeve 1 is provided with the outer sleeve 2 coaxial with the inner sleeve, the radial buffer sleeve 4 and the rolling sleeve 3 are sequentially arranged between the inner side of the outer sleeve 2 and the outer side of the inner sleeve 1 from outside to inside, the left end of the rolling sleeve 3 is positioned at the left side of the outer sleeve 2, the left side and the right side of the inner side of the rolling sleeve 3 are provided with at least two outer tooth groups at intervals, each outer tooth group comprises at least three cylindrical outer PDC teeth 5 distributed at intervals along the circumference, the outer end surfaces of the inner PDC teeth 6 of every two adjacent inner tooth groups are arranged in a staggered manner, the outer end surfaces of the inner PDC teeth 6 of every inner tooth group are contacted with the outer end surfaces of the outer teeth 5 of the outer tooth groups at corresponding positions, the outer side of the right part of the rolling sleeve 3 is fixedly connected with the inner side of the radial buffer sleeve 4 in a vulcanization mode, the outer side of the radial buffer sleeve 4 is fixedly connected with the inner side of the outer sleeve 2 in a vulcanization mode, the outer side of the left end of the outer sleeve 2 is sleeved with an axial buffer sleeve, and the inner side of the left part of the axial buffer sleeve is fixedly installed with the outer side of the left part of the rolling sleeve 3 in a vulcanization mode.

According to the demand, the quantity of outer tooth group and internal tooth group is 2, and the quantity of the outer PDC tooth 5 of every outer tooth group and the interior PDC tooth 6 of every interior tooth group are 21, and the interior PDC tooth 6 that is located the left side sets up with the interior PDC tooth 6 that is located the right side is crisscross, and radial cushion collar 4 is prior known technology, such as silicon sulfide rubber. In the use, through setting up axial cushion collar and radial cushion collar 4, can slow down radial impact and the vibration that comes from overcoat 2, PDC tooth 6 and outer PDC tooth 5 fracture damage in can avoiding, through PDC tooth 6 and outer PDC tooth 5 in setting up, loss when can increasing relative rotation between endotheca 1 and the roll cover 3, interior PDC tooth 6 through adjacent two interior tooth groups is the setting of staggering, can increase the area of contact between interior PDC tooth 6 and the outer PDC tooth 5, reduces the failure rate, the extension the utility model discloses a life.

The PDC bearing for the downhole tool can be further optimized or/and improved according to actual needs:

as shown in fig. 1 and 2, the axial buffer sleeve includes an inner arc ring sleeve 9 and a support ring 10, a first outer ring table 7 is fixed on the outer side of the left portion of the outer sleeve 2, an arc ring table 8 is fixed on the outer side of the left end of the outer sleeve 2 corresponding to the left side of the first outer ring table 7, the arc ring table 8 is a ring table with an outer ring in the shape of a narrow left arc and a wide right arc, the inner arc ring sleeve 9 with a gap between the right end surface and the left end surface of the first outer ring table 7 is hermetically sleeved on the outer side of the arc ring table 8, the inner arc ring sleeve 9 is an arc inner hole matched with the outer arc surface of the arc ring table 8, a buffer space capable of enabling the inner arc ring sleeve 9 and the arc ring table 8 to move relatively along the axial direction is arranged between the right end surface and the left end surface of the arc ring table 8, the support ring 10 is fixed on the left end surface of the inner arc ring.

During use, through the arrangement, when axial impact and vibration are received, the impact and the vibration transmitted from the outer sleeve 2 to the support ring 10 are relieved through the buffer space; because the impact does not act along the axial direction completely, when the buffer sleeve is subjected to oblique force, the outer sleeve 2 and the support ring 10 are adjusted in a rotating mode through the cooperation of the cambered surfaces between the cambered surface ring platform 8 and the inner cambered surface ring sleeve 9, the buffer sleeve is prevented from being blocked, and the axial buffer sleeve is guaranteed to be reliable and stable.

As shown in the attached drawings 1 and 2, the wear-resistant device further comprises a wear-resistant assembly, the left side of the support ring 10 is provided with the wear-resistant assembly, the wear-resistant assembly comprises a left wear-resistant ring 13, a left wear-resistant patch 15, a right wear-resistant ring 14, a right wear-resistant patch 16 and first countersunk head bolts 11, the right end surface of the support ring 10 is fixedly provided with the right wear-resistant ring 14 sleeved outside the left end of the rolling sleeve 3, the right end surface of the right wear-resistant ring 14 is uniformly provided with at least three first threaded blind holes along the circumference, the left end of the support ring 10 corresponding to each first threaded blind hole is provided with a first through hole which is communicated from left to right, each first through hole is a stepped countersunk head hole which is narrow at left and wide at right, each first countersunk head bolt 11 is arranged in each first connecting hole, the right end of each first countersunk head bolt 11 passes through the narrow diameter section of the first connecting hole and is fixedly installed in the first threaded blind hole at the corresponding position through the thread, at least three right wear-resistant patches 16 are uniformly distributed on the left end surface of the right wear-resistant ring 14 at intervals along the circumference, a left wear-resistant ring 13 is fixedly mounted on the outer side of the left part of the inner sleeve 1 corresponding to the left position of the right wear-resistant ring 14, and a left wear-resistant patch 15 corresponding to the right wear-resistant patch 16 is fixedly mounted on the right end surface of the left wear-resistant ring 13.

According to the requirement, the left wear-resistant patch 15 and the right wear-resistant patch 16 are both in the prior art, such as a cylindrical PDC composite sheet, and the number of the left wear-resistant patch 15 and the number of the right wear-resistant patch 16 are 28 and 27 respectively. In the using process, the right wear-resistant ring 14 can be reliably fixed on the left side of the support ring 10 by arranging the first countersunk head bolt 11, once the right wear-resistant paster 16 is damaged, the right wear-resistant ring 14 can be disassembled by the first countersunk head bolt 11, a new right wear-resistant paster 16 is replaced or the right wear-resistant paster 16 is repaired in a welding mode and then is continuously used, the maintenance cost is low, and the waste is reduced; have right wear-resisting paster 16 through the circumference interval equipartition on the 14 left end faces of right wear-resisting circle, can make and form the runner between endotheca 1 and the 14 outsides of right wear-resisting circle, the drilling fluid passes through the runner and gets into between endotheca 1 and the rolling sleeve 3, can play the cooling effect to left wear-resisting paster 15 in the course of the work, right wear-resisting paster 16, outer PDC tooth 5 and interior PDC tooth 6, improves the utility model discloses a life.

As shown in the attached figure 1, the anti-theft oil filling device further comprises a second outer ring platform 17, a third outer ring platform 18, an oil filling plug 19 and second countersunk bolts 12, wherein the second outer ring platform 17 is fixed on the outer side of the left end of the inner sleeve 1, the third outer ring platform 18 is fixed on the outer side of the left part of the inner sleeve 1 corresponding to the right side of the second outer ring platform 17, the outer side of the third outer ring platform 18 is in interference fit with the inner side of the left part of the left wear-resisting ring 13, at least three second threaded blind holes are uniformly distributed on the left end surface of the left wear-resisting ring 13 along the circumference, second connecting holes which are communicated from left to right are arranged at the right end of the second outer ring platform 17 corresponding to the positions of the second threaded blind holes, each second connecting hole is a stepped countersunk hole which is wide from left to right, a second countersunk bolt 12 is arranged in each second connecting hole, the left end bolt head of each second countersunk bolt 12 is arranged in the wide-diameter section of the second connecting hole corresponding position, the right end of each second countersunk bolt 12 is fixedly arranged in the second threaded blind hole, the second outer ring platform 17 middle part outside corresponding to the position between two adjacent second connecting holes has at least one inside and outside oil filler point that link up along the circumference equipartition, and equal fixed mounting has the oiling to block up 19 in every oil filler point, corresponds the second outer ring platform 17 outside of the right-hand position of oil filler point, the wear-resisting ring 13 outside of left side and the wear-resisting ring 14 outside of right side and all is equipped with dismantles the annular 32.

According to requirements, the number of the oil filling holes is 2, the threaded holes with the specification of NPT1/16 are symmetrically arranged, and the oil filling plug 19 is the prior known technology, such as an inner hexagonal oil plug. In the using process, the left wear-resistant ring 13 can be reliably and fixedly arranged on the outer side of the inner sleeve 1 through the arrangement, the left wear-resistant ring 13 can be reliably fixed on the outer side of the inner sleeve 1 through the arrangement of the second countersunk head bolt 12, once the left wear-resistant paster 15 is damaged, the left wear-resistant ring 13 can be disassembled through the second countersunk head bolt 12, a new left wear-resistant paster 15 is replaced, or the left wear-resistant paster 15 is repaired in a welding mode and then is continuously used, so that the maintenance cost is low, and the waste is reduced; through setting up the oil filler point, can pour into emollient into between endotheca 1 and the dabber into, the lubrication between endotheca 1 and the dabber of being convenient for also can be convenient for the dismantlement of endotheca 1 and dabber, dismantles annular 32 through the setting, can adopt hydraulic form separation left wear-resisting circle 13 and right wear-resisting circle 14, saves maintenance duration.

As shown in the attached drawing 1, the outer sleeve further comprises a left annular protrusion 20, a right annular protrusion 21 and an outer annular protrusion 22, the outer side of the left end of the radial buffer sleeve 4 is fixed with the left annular protrusion 20, the inner side of the left end of the outer sleeve 2 corresponding to the position of the left annular protrusion 20 is provided with a left mounting clamping groove, and the left annular protrusion 20 is vulcanized and fixed in the left mounting clamping groove; a right annular protrusion 21 is fixed on the outer side of the right end of the radial buffer sleeve 4, a right mounting clamping groove is formed in the inner side of the right end of the outer sleeve 2 corresponding to the position of the right annular protrusion 21, and the right annular protrusion 21 is fixed in the right mounting clamping groove in a vulcanization mode; at least one outer annular protrusion 22 is arranged on the outer side of the radial buffer sleeve 4 corresponding to the position between the left annular protrusion 20 and the right annular protrusion 21 at a left-right interval, a limit ring groove is arranged on the inner side of the outer sleeve 2 corresponding to the position of each outer annular protrusion 22, and each outer annular protrusion 22 is vulcanized and fixed in the limit ring groove corresponding to the position.

In the use process, through the arrangement, the radial buffer sleeve 4 plays a role in connecting the outer sleeve 2 and the rolling sleeve 3 and also plays a role in damping and buffering the rolling sleeve 3; this PDC bearing when using in the oil drilling instrument, its roll sleeve 3 is except receiving impact and vibration indirectly through overcoat 2, roll sleeve 3 self also can directly receive axial impact and vibration left, under this condition, left side ring is suddenly 20, right side ring is suddenly 21 and outer ring is suddenly 22 and is arranged in left installation draw-in groove respectively, right side installation draw-in groove and spacing annular, can absorb partial axial impact and vibration, play the effect of shock attenuation buffering to roll sleeve 3, also can reduce impact and vibration that outer PDC tooth 5 and interior PDC tooth 6 received.

As shown in the attached figure 1, the outer sleeve further comprises a left outer ring clamping table 23, a right outer ring clamping table 24 and a connecting key 26, the right outer ring clamping table 24 is fixed on the outer side of the right end of the rolling sleeve 3, a space is arranged between the outer side of the right outer ring clamping table 24 and the inner side of the right end of the outer sleeve 2 at the corresponding position, the left end of the right outer ring clamping table 24 is fixedly connected with the right end of the radial buffer sleeve 4 in a vulcanization mode, a left outer ring clamping table 23 is fixed on the outer side of the left part of the rolling sleeve 3 corresponding to the left side position of the radial buffer sleeve 4, a space is arranged between the right end surface of the support ring 10 and the left end surface of the left outer ring clamping table 23, a first key groove with an upward opening is arranged on the upper side of the right part of the rolling sleeve 3 corresponding to the position between the left outer ring clamping table 23 and the right outer ring clamping table 24, the radial buffer sleeve 4 corresponding to the first key groove position is provided with a mounting hole which is through up and down, a connecting key 26 is fixedly mounted in the mounting hole, the bottom surface of the connecting key 26 supports against the bottom of the first key groove, and the top surface of the connecting key 26 supports against the inner wall of the corresponding position of the outer sleeve 2.

In the use, through setting up left outer loop ka tai 23 and right outer loop ka tai 24, not only can make radial cushion collar 4 and roll the reliable connection of cover 3 together, still play the shock attenuation cushioning effect to roll cover 3, through setting up connector key 26, can carry out axial and radial location to roll cover 3 and overcoat 2, also can improve radial cushion collar 4's antitorque ability.

As shown in the attached figure 1, the sealing device comprises a first sealing ring 27, a second sealing ring 28, a third sealing ring 29 and a fourth sealing ring 30, wherein the middle part of the inner sleeve 1 is provided with a mounting hole, the mounting hole comprises a left taper hole section, a left straight hole section, a horn mouth section with a large left part and a small right part, a right straight hole section and a right taper hole section which are sequentially communicated together from left to right, the inner side of the inner sleeve 1 corresponding to the middle part of the left straight hole section is provided with a first sealing ring groove, the first sealing ring 27 is arranged in the first sealing ring groove, the inner side of the inner sleeve 1 corresponding to the left part of the right straight hole section is uniformly provided with at least one second key groove with an inward opening along the circumference, the right part of the right straight hole section is provided with a second sealing ring groove, the second sealing ring 28 is arranged in the second sealing ring groove, the outer ring surface of the cambered surface ring platform 8 is provided with a third sealing ring groove, the third sealing ring 29, a fourth sealing ring 30 is arranged in the fourth sealing ring groove.

The first seal ring 27, the second seal ring 28, the third seal ring 29 and the fourth seal ring 30 are all well known in the art, such as O-ring seals, as required. In the use, through such setting, can increase the leakproofness between endotheca 1 and the dabber, between overcoat 2 and the drilling tool irrotational shell and between cambered surface ring platform 8 and the intrados ring cover 9, avoid the drilling fluid to flow in and make the utility model discloses dismantle the difficulty, through setting up the second keyway, install the key when the dabber of packing into, improve the torque between dabber and the endotheca 1.

As shown in the attached drawings 1 and 2, the positioning device further comprises a positioning assembly, the positioning assembly comprises a positioning key 31 and a clamping ring 25, at least one opening is uniformly distributed on the left end face of the support ring 10 corresponding to the position between the two adjacent second connecting holes along the circumference, the right positioning key groove is oblong, a left positioning key groove with the same structure as the right positioning key groove is arranged on the right end face of the right wear-resistant ring 14 corresponding to the position of each right positioning key 31 groove, the positioning key 31 with the right part positioned in the right positioning key groove is arranged in each left positioning key groove, a fixing ring groove is arranged at the right end of the right straight hole section, and the clamping ring 25 is arranged in the fixing ring.

The orientation key 31 and the collar 25 are both well known in the art, as desired. In the use process, the support ring 10 and the right wear-resisting ring 14 can be axially and radially positioned by arranging the positioning key 31, and the mandrel and the inner sleeve 1 can be positioned by arranging the clamping ring 25.

Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.

Claims

1. A PDC bearing for a downhole tool is characterized by comprising an inner sleeve, an outer sleeve, a rolling sleeve, a radial buffer sleeve, an axial buffer sleeve, an outer tooth group and an inner tooth group, wherein the outer side of the right part of the inner sleeve is provided with the outer sleeve coaxial with the inner sleeve, the radial buffer sleeve and the rolling sleeve are sequentially arranged between the inner side of the outer sleeve and the outer side of the inner sleeve from outside to inside, the left end of the rolling sleeve is positioned at the left side of the outer sleeve, the left side and the right side of the inner side of the rolling sleeve are provided with at least two outer tooth groups at intervals, each outer tooth group comprises at least three cylindrical outer PDC teeth at intervals along the circumference, the outer end surface of each inner PDC tooth group is contacted with the outer end surface of the outer tooth group at the corresponding position, the outer side of the right part of the rolling sleeve is fixedly connected with the inner side of the radial buffer sleeve in a vulcanization mode, the outer side of the radial buffer sleeve is fixedly connected with the inner side of the outer sleeve in a vulcanization mode, the outer side of the left end of the outer sleeve is sleeved with the axial buffer sleeve, and the inner side of the left part of the axial buffer sleeve is fixedly installed with the outer side of the left part of the rolling sleeve.

2. The PDC bearing of claim 1, wherein the axial buffer sleeve includes an inner arc ring sleeve and a support ring, a first outer ring table is fixed on an outer side of a left portion of the outer sleeve, an arc ring table is fixed on an outer side of a left end of the outer sleeve corresponding to a left side of the first outer ring table, the arc ring table is a ring table with an outer ring in a shape of a narrow right arc, a wide right arc, a space is provided between a right end face of the inner arc ring sleeve and a left end face of the first outer ring table in a sealing manner, the inner arc ring sleeve is provided with an arc inner hole matched with an outer arc of the arc ring table, a buffer space enabling the inner right end face of the inner arc ring sleeve and the left end face of the arc ring table to move relative to each other in an axial direction is provided between the inner right end face of the inner arc ring sleeve and the left end face of the arc ring sleeve, the support ring is fixed on a left.

3. The PDC bearing for the downhole tool according to claim 2, further comprising a wear assembly provided on a left side of the support ring, the wear assembly including a left wear ring, a left wear patch, a right wear ring, a right wear patch and first countersunk bolts, the right wear ring mounted on an outer side of a left end of the rolling sleeve is fixedly mounted on a left end surface of the support ring, at least three first threaded blind holes are circumferentially and uniformly distributed on a right end surface of the right wear ring, a left end of the support ring corresponding to each first threaded blind hole is provided with a first connection hole penetrating left and right, each first connection hole is a stepped countersunk hole having a narrow left end and a wide right end, a first countersunk bolt is provided in each first connection hole, a right end bolt head of each first countersunk bolt is disposed in a wide diameter section of the first connection hole at a corresponding position, a left end of each first countersunk bolt is fixedly mounted in the first threaded blind hole at the corresponding position through a narrow diameter section of the first connection hole by a thread, at least three right wear-resistant patches are uniformly distributed on the left end face of the right wear-resistant ring at intervals along the circumference, a left wear-resistant ring is fixedly mounted on the outer side of the left part of the inner sleeve corresponding to the left position of the right wear-resistant ring, and a left wear-resistant patch corresponding to the right wear-resistant patch is fixedly mounted on the right end face of the left wear-resistant ring.

4. The PDC bearing of claim 3, further comprising a second outer ring table, a third outer ring table, an oil plug, and a second countersunk bolt, wherein the second outer ring table is fixed to an outer side of a left end of the inner sleeve, the third outer ring table is fixed to an outer side of a left portion of the inner sleeve corresponding to a right portion of the second outer ring table, an outer side of the third outer ring table is in interference fit with an inner side of a left portion of the left wear-resistant ring, at least three second threaded blind holes are uniformly distributed on a left end surface of the left wear-resistant ring along a circumference, a second connecting hole penetrating left and right is formed in a right end of the second outer ring table corresponding to each second threaded blind hole, each second connecting hole is a stepped countersunk hole with a wide left portion and a narrow right portion, a second countersunk bolt is arranged in each second connecting hole, a left end of each second countersunk bolt is arranged in a wide portion of the corresponding second connecting hole, and a right end of each second countersunk bolt passes through the second narrow portion and is fixedly mounted on the corresponding second threaded portion through the second connecting hole In, correspond the outer ring platform middle part outside of second of position between two adjacent second connecting holes and have at least one inside and outside oil filler point that link up along the circumference equipartition, equal fixed mounting has the oiling to block up in every oil filler point, corresponds the outer ring platform outside of second of the right-hand position of oil filler point, the wear-resisting circle outside of a left side and the wear-resisting circle outside of a right side and all is equipped with the dismantlement annular.

5. The PDC bearing for the downhole tool according to claim 2, 3 or 4, further comprising a left annular protrusion, a right annular protrusion and an outer annular protrusion, wherein the left annular protrusion is fixed on the outer side of the left end of the radial buffer sleeve, a left mounting clamping groove is formed in the inner side of the left end of the outer sleeve corresponding to the left annular protrusion, and the left annular protrusion is vulcanized and fixed in the left mounting clamping groove; a right annular protrusion is fixed on the outer side of the right end of the radial buffer sleeve, a right mounting clamping groove is formed in the inner side of the right end of the outer sleeve corresponding to the position of the right annular protrusion, and the right annular protrusion is vulcanized and fixed in the right mounting clamping groove; the outer side of the radial buffer sleeve corresponding to the position between the left annular protrusion and the right annular protrusion is provided with at least one outer annular protrusion at intervals, the inner side of the outer sleeve corresponding to the position of each outer annular protrusion is provided with a limiting ring groove, and each outer annular protrusion is vulcanized and fixed in the limiting ring groove corresponding to the position.

6. The PDC bearing for the downhole tool according to claim 2, 3 or 4, further comprising a left outer ring chuck, a right outer ring chuck and a connecting key, wherein the right outer ring chuck is fixed on an outer side of a right end of the rolling sleeve, a space is provided between an outer side of the right outer ring chuck and an inner side of a right end of the outer sleeve at a corresponding position, a left end of the right outer ring chuck is fixedly connected with a right end of the radial buffer sleeve in a vulcanization manner, a left outer ring chuck is fixed on an outer side of a left portion of the rolling sleeve at a position corresponding to a left side of the radial buffer sleeve, a space is provided between a right end surface of the support ring and a left end surface of the left outer ring chuck, a first key groove with an upward opening is provided on an upper side of a right portion of the rolling sleeve at a position corresponding to the left outer ring chuck and the right outer ring chuck, a vertically through mounting hole is provided on the radial buffer sleeve at a position corresponding to the first key, the top surface of the connecting key is propped against the inner wall of the corresponding position of the outer sleeve.

7. The PDC bearing of claim 5, further comprising a left outer ring clamping table, a right outer ring clamping table and a connecting key, wherein the right outer ring clamping table is fixed on the outer side of the right end of the rolling sleeve, a space is formed between the outer side of the right outer ring clamping table and the inner side of the right end of the outer sleeve at the corresponding position, the left end of the right outer ring clamping table is fixedly connected with the right end of the radial buffer sleeve in a vulcanization manner, a left outer ring clamping table is fixed on the outer side of the left part of the rolling sleeve corresponding to the left side of the radial buffer sleeve, a space is arranged between the right end surface of the support ring and the left end surface of the left outer ring clamping table, a first key groove with an upward opening is arranged on the upper side of the right part of the rolling sleeve corresponding to the position between the left outer ring clamping table and the right outer ring clamping table, the radial buffer cover that corresponds first keyway position is equipped with the mounting hole that link up from top to bottom, and the mounting hole internal fixation has the connection key, and the bottom surface of connection key supports the bottom at first keyway, and the top surface of connection key supports the inner wall that corresponds the position at the overcoat.

8. The PDC bearing for a downhole tool according to claim 2, 3, 4 or 7, further comprising a sealing assembly including a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, wherein the inner sleeve is provided with a mounting hole at a middle portion thereof, the mounting hole includes a left taper hole section, a left straight hole section, a left horn mouth section, a right straight hole section and a right taper hole section which are sequentially communicated from left to right, a first sealing ring groove is provided at an inner side of the inner sleeve corresponding to the middle portion of the left straight hole section, the first sealing ring is provided in the first sealing ring groove, at least one second key groove having an inward opening is circumferentially uniformly provided at an inner side of the inner sleeve corresponding to the left portion of the right straight hole section, the second sealing ring is provided in the second sealing ring groove, a third sealing ring groove is provided in an outer annular surface of the cambered annular table, and the third sealing ring is provided in the third sealing ring groove, a fourth sealing ring groove is formed in the outer side of the right end of the outer sleeve, and a fourth sealing ring is arranged in the fourth sealing ring groove; or/and, still include locating component, locating component includes navigation key and rand, correspond and have at least one opening left and be the right navigation key groove of long circle along the circumference equipartition on the support ring left end face of position between two adjacent second connecting holes, all be equipped with the left navigation key groove the same with right navigation key groove structure on the right wear-resisting circle right-hand member face that corresponds every right navigation key groove position, all install the navigation key that the right part is located right navigation key groove in every left navigation key groove, right straight hole section right-hand member is equipped with the fixed ring groove, be equipped with the rand in the fixed ring groove.

9. The PDC bearing for a downhole tool according to claim 5, further comprising a sealing member including a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, wherein the inner sleeve is provided with a mounting hole at a middle portion thereof, the mounting hole includes a left taper hole section, a left straight hole section, a left flare hole section, a right straight hole section and a right taper hole section which are sequentially communicated from left to right, a first sealing ring groove is formed at an inner side of the inner sleeve corresponding to the middle portion of the left straight hole section, the first sealing ring is disposed in the first sealing ring groove, at least one second key groove having an inward opening is circumferentially uniformly formed at an inner side of the inner sleeve corresponding to the left portion of the right straight hole section, the second sealing ring groove is disposed in the right straight hole section, the third sealing ring groove is disposed on an outer circumferential surface of the arc-surface ring table, the third sealing ring is disposed in the third sealing ring groove, a fourth sealing ring groove is formed in the outer side of the right end of the outer sleeve, and a fourth sealing ring is arranged in the fourth sealing ring groove; or/and, still include locating component, locating component includes navigation key and rand, correspond and have at least one opening left and be the right navigation key groove of long circle along the circumference equipartition on the support ring left end face of position between two adjacent second connecting holes, all be equipped with the left navigation key groove the same with right navigation key groove structure on the right wear-resisting circle right-hand member face that corresponds every right navigation key groove position, all install the navigation key that the right part is located right navigation key groove in every left navigation key groove, right straight hole section right-hand member is equipped with the fixed ring groove, be equipped with the rand in the fixed ring groove.

10. The PDC bearing for a downhole tool according to claim 6, further comprising a sealing member including a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, wherein the inner sleeve is provided with a mounting hole at a middle portion thereof, the mounting hole includes a left taper hole section, a left straight hole section, a left flare hole section, a right straight hole section and a right taper hole section which are sequentially communicated from left to right, a first sealing ring groove is formed at an inner side of the inner sleeve corresponding to the middle portion of the left straight hole section, the first sealing ring is disposed in the first sealing ring groove, at least one second key groove having an inward opening is circumferentially uniformly formed at an inner side of the inner sleeve corresponding to the left portion of the right straight hole section, the second sealing ring groove is disposed in the right straight hole section, the third sealing ring groove is disposed on an outer circumferential surface of the arc-surface ring table, the third sealing ring is disposed in the third sealing ring groove, a fourth sealing ring groove is formed in the outer side of the right end of the outer sleeve, and a fourth sealing ring is arranged in the fourth sealing ring groove; or/and, still include locating component, locating component includes navigation key and rand, correspond and have at least one opening left and be the right navigation key groove of long circle along the circumference equipartition on the support ring left end face of position between two adjacent second connecting holes, all be equipped with the left navigation key groove the same with right navigation key groove structure on the right wear-resisting circle right-hand member face that corresponds every right navigation key groove position, all install the navigation key that the right part is located right navigation key groove in every left navigation key groove, right straight hole section right-hand member is equipped with the fixed ring groove, be equipped with the rand in the fixed ring groove.