CN101852069A - Supporting rotating control head of underbalanced coal bed methane well drilling - Google Patents
Supporting rotating control head of underbalanced coal bed methane well drilling Download PDFInfo
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- CN101852069A CN101852069A CN 201010301419 CN201010301419A CN101852069A CN 101852069 A CN101852069 A CN 101852069A CN 201010301419 CN201010301419 CN 201010301419 CN 201010301419 A CN201010301419 A CN 201010301419A CN 101852069 A CN101852069 A CN 101852069A
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Abstract
The invention relates to a supporting rotating control head of an underbalanced coal bed methane well drilling, which is mainly used for an underbalanced well drilling and belongs to the filed of well control equipment of underbalanced well drillings. The supporting rotating control head comprises a rotating assembly, a hoop assembly and a shell assembly, the rotating assembly is arranged in the shell assembly, the hoop assembly installed on the upper end of the shell utilizes a manual mode to close the hoop body, and the rotating assembly is fixed to complete equipment assembling. The inner side of the hoop body is provided with a two-cone to strengthen righting effect, the rotating assembly utilizes a centralization lubrication structure to lubricate a centripetal force and push bearing combination and a dynamic seal component to prolong the service life of equipment, the lower end of the rotating assembly is provided with a rubber core to guide returning drilling medium to realize safety control. The shell assembly utilizes a structure of separating the shell body and a bypass port, thus facilitating replacement, enhancing the continuous working capability and improving equipment use ratio of the control head. The device has simple and compact structure, easy transportation, low equipment cost, maintenance convenience, and high stability and safety, and is suitable for needs of coal mining with three areas, namely area low in pressure, saturation and infiltration geological characteristics in China.
Description
Technical field
The invention belongs to a kind of well control device in the coal bed gas drillng operation, be specifically related in the coal bed gas under-balance drilling operation, provide the rotating control assembly of liquid in well head pressure control safely and effectively and the diversion well.
Background technology
Start to walk than later at China's cbm development, basic theory all can't be compared with the conventional gas exploitation with technical, especially special " three is low " in coal seam is low pressure, low saturated, the geologic feature of hyposmosis causes the coal bed gas well yield generally lower again, and the present coal bed gas drilling technology of China is more single, existing drilling technology, equipment and instrument are mostly used for reference from oil drilling, do not match with the special operation condition of coal bed gas drilling well, cause drilling cost higher, these reasons have constituted the serious principal element that restricts China's coal bed gas large-scale development, and promptly well yield is low, the drilling cost height, drilling technology does not match, special tool and equipment scarcity etc.Under-balanced drilling technology is because outstanding reservoir protection ability and higher aspect characteristics such as bit speed; make it on coal-bed gas exploitation, have tangible technical advantage, can reduce solid particle in the outside fluid to the infringement of coal gas layer, reduce infringement that the migration of coal gas layer internal particle causes, the hydration swelling that reduces mud medium clay soil particle stops up hole, avoid the being unworthy of property of fluid to the infringement of coal gas layer, avoid water lock effect etc.Therefore research is applicable to the under-balanced drilling technology of coal bed gas, can reduce coal bed gas drilling cost, protection reservoir, improve bit speed, helps carrying out large-scale cbm development, finishes the capacity planning index of coal bed gas.
Greatly develop the coal bed gas under-balanced drilling technology, the instrument that is applicable to the coal bed gas under-balanced drilling technology must be arranged and be equipped for support.Because the geological conditions of coal bed gas drilling well uniqueness and special casing programme, directly will be used for the under balance pressure drilling instrument of oil drilling and equipment and be transplanted to that the coal bed gas under balance pressure drilling just exposes the cost height, volume is big, and be unfavorable for resettlement rapidly and improve a series of problems such as drilling speed.The swivel control head that uses in the coal bed gas drilling well is at present introduced from oil drilling, 500,000 yuan/platform of about RMB, and volume greatly, has highly surpassed the setting height(from bottom) of small-sized truck-mounted drilling rig (workover rig), truck-mounted drilling rig (workover rig) chassis need be raised during use, influence stability and the safety in the drilling process.Therefore, on existing basis, develop the special tool that is applicable to the coal bed gas under balance pressure drilling and be equipped with to be beneficial to and reduce the individual well operating cost, improve bit speed, strengthen equipment migration property, very necessary and urgent for the overall plan of cbm development.
Chinese patent publication number CN 101182760A, open day on May 21st, 2008, the name of innovation and creation is called the under balance pressure drilling rotating control assembly, this application case discloses the under balance pressure drilling rotating control assembly, its weak point is: what by-pass port and housing adopted is that welding manner is connected, through on the drilling well medium erosion repeatedly returned, enclosure body is passed through the position mutually with by-pass port and is occurred damage easily, housing assembly integral body can only be changed during maintenance, prolong the activity duration; This device increases fluid cylinder, switch with the control clip, make equipment volume bigger than normal, and bearing assembly adopts the multistage kind of drive, complex structure, and device height has also surpassed the setting height(from bottom) of small-sized truck-mounted drilling rig, the truck-mounted drilling rig chassis need be raised during use, influenced stability and the safety in the drilling process, be unfavorable for that drilling speed improves and relocation equipment, input cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of swivel control head device that is specifically designed to the coal bed gas under balance pressure drilling, the problem that one side solution equipment and operating mode do not match, solve the unbalanced problem of input and output on the other hand, be that well yield is low, input cost is high, to be implemented in the low-cost drilling process of stablizing down, finish safely to coal bed gas well.
In order to reach above purpose, the invention provides following technical solution: supporting rotating control head of underbalanced coal bed methane well drilling involved in the present invention, comprise rotation assembly, clip assembly and housing assembly composition, the clip assembly is installed on the housing assembly upper end, the rotation assembly passes casing ring and is seated in housing assembly, rotate the slip-knot bolt on the clip assembly, tighten shoulder nut and close clip, fixing rotation assembly, the assembling of whole rotating control assembly is realized in gap between casing ring sealing rotation assembly and housing assembly.
Supporting rotating control head of underbalanced coal bed methane well drilling involved in the present invention, described rotation assembly upper end directly connects the kelly bar driver, drive by kelly bar, it comprises central tube, mud retaining ring, bearing cover, last radial bearing, following radial bearing, up-thrust bearing, lower thrust-bearing, dynamic sealing assembly, rotary shell, the movable sealing gland, glue core and glue core terminal pad, the central tube upper end is equipped with mud retaining ring, shaft shoulder place installs thrust bearing and lower thrust-bearing respectively in both sides, the upper bearing (metal) packing ring is installed on up-thrust bearing one side, the lower bearing packing ring is installed on lower thrust-bearing one side, last radial bearing is installed on upper bearing (metal) packing ring side, following radial bearing is installed on lower bearing packing ring side, last, shaft block ring is installed in the following radial bearing outside respectively, the lower shaft back-up ring, bearing, bearing washer, central tube is installed in the rotary shell; Described bearing cover is connected with rotary shell by hexagon-headed bolt, and the outside is provided with bearing cover static seal circle, and the inboard is provided with two groups of o RunddichtringOs; Dynamic sealing assembly is made up of oil pressure packing, spacer ring with holes, well pressure-conducting disk root and septulum ring, is installed in the rotary shell movable sealing groove, fixes by the movable sealing gland, and movable sealing gland inboard is provided with dust ring, is provided with gland ring with the rotary shell junction; Glue core terminal pad is installed in the central tube lower end, connects by soket head cap screw, and glue core terminal pad upper end is provided with glue core terminal pad static seal circle, realize and the static seal of central tube that the glue core is installed in glue core terminal pad lower end, connect by carrying the silk screw bolt and nut, the glue core cooperates with drilling rod, the water conservancy diversion drilling fluid.
Supporting rotating control head of underbalanced coal bed methane well drilling involved in the present invention, described housing assembly is made up of enclosure body, casing ring, clip back-up block, stop screw, clip hinge seat, hanger, studding bolt and studs, housing assembly adopts enclosure body and by-pass port isolating construction, by-pass port separated make casing connecting spool, described casing connecting spool and enclosure body are installed on the enclosure body by studding bolt and hex nut; Casing ring is installed in the seal groove of enclosure body upper end; Clip hinge seat, clip back-up block and hanger are connected by welding procedure with the clip body, four hangers uniform with the enclosure body face of cylinder on; Stop screw is installed on the clip back-up block by screw thread; Blank flange and casing connecting spool link by studs and hex nut.
Supporting rotating control head of underbalanced coal bed methane well drilling involved in the present invention, described clip assembly is made up of left and right body clip, slip-knot bolt, clip bearing pin, slip-knot bolt bearing pin, lifting bolt and shoulder nut, left side body clip is connected by the clip bearing pin with right body clip, is installed on the hinge seat of housing assembly; Lifting bolt is installed on the clip body; The slip-knot bolt is installed on the right body clip by slip-knot bolt bearing pin; Described clip assembly adopts biconical surface structure, is stuck in the conical surface on the housing assembly upper end conical surface and the rotary shell.
The present invention has advantage: this device is a cylindrical structural, and maximum total height is 944 millimeters, and maximum gauge is 564 millimeters, and the oil pressure that is applicable to is fit to 5 cun half and the use of following size drilling rod less than the under balance pressure drilling of 7 megapascal (MPa)s; Adopt the yoke configurations of manual-lock, the simplified apparatus structure, reduction equipment drops into, and the left and right sides clip body of clip assembly adopts biconical surface structure, sets upright effective; The bearing combination employing radial bearing of rotation assembly and thrust bearing are born axial force and the lateral force in the wellbore construction respectively, stressed reasonable, compact conformation between the bearing; The centralized lubrication structure is adopted in bearing combination and dynamic seal, movable sealing is become wet friction, prolong dynamic seal application life, reduce to safeguard and drop into that the glue core is equipped with in the lower end, the sealing drilling tool is realized pressure control, the guarantee working security; Housing assembly adopts enclosure body and by-pass port isolating construction, is convenient for changing by-pass port, is beneficial to prolong the swivel control head activity duration, improves utilization rate of equipment and installations.This apparatus structure is simple, compact, and shipment is convenient, and equipment cost is low, and all spare and accessory parts are realized production domesticization, makes, safeguards, safety and stability are high, are beneficial to the raising drilling speed, prolong bit life.
Description of drawings
Fig. 1 is the supporting rotating control head of underbalanced coal bed methane well drilling structural representation
Fig. 2 is a rotation assembly structure schematic diagram
Fig. 3 is the dynamic sealing assembly sectional view
Fig. 4 is the rotary shell sectional view
Fig. 5 is a clip assembly structure schematic diagram
Fig. 6 is the clip sectional view
Fig. 7 is the housing assembly structural representation
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The specific embodiment
Disclosed all features in this manual, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this manual (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
As shown in Figure 1, 2, swivel control head involved in the present invention, comprise rotation assembly (1), clip assembly (2) and housing assembly (3), rotation assembly (1) is gone up termination kelly bar driver, driven by kelly bar, make that central tube (24) and the glue core (14) in the rotation assembly (1) rotates with respect to housing assembly (3), the drilling well medium flows out by casing connecting spool (50) through annular space, enter solid controlling system, realize the function of swivel control head: the packing between bore hole annulus and the rig floor; Pressure control safely and effectively is provided; The fluid diversion well head that well is returned out.As shown in Figure 2, rotation assembly involved in the present invention is made up of central tube (24), mud retaining ring (4), bearing cover (6), O RunddichtringO (27), last radial bearing (8), following radial bearing (11), up-thrust bearing (9), lower thrust-bearing (10), dynamic sealing assembly (20), rotary shell (23) and movable sealing gland (18).Central tube (24) shaft shoulder place installs both sides thrust bearing (9) and lower thrust-bearing (10) respectively, by the unidirectional location of the shaft shoulder; Upper bearing (metal) packing ring (25) is installed on up-thrust bearing (9) one sides, lower bearing packing ring (22) is installed on lower thrust-bearing (10) one sides, last radial bearing (8) is installed on upper bearing (metal) packing ring (25) side, following radial bearing (11) is installed on lower bearing packing ring (22) side, install shaft block ring (7), lower shaft back-up ring (21) respectively in the upper and lower radial bearing outside, bearing, bearing washer, central tube (24) are installed in the rotary shell (23), unidirectional location; Bearing cover (6) is connected with rotary shell (23) by hexagon-headed bolt (5), location bearing, described bearing cover (6) outside is provided with bearing cover static seal circle (26), realize the static seal of rotary shell (23) and bearing cover (6), avoid the leakage of lubrication oil, the inboard is provided with two groups of O RunddichtringOs (27), realizes the rotary dynamic seal with central tube (24); In central tube upper end a mud retaining ring (4) has been installed, has been avoided reducing this place's movable sealing life-span at the drilling fluid contamination O RunddichtringO (27) that rises, take out of in the going down process; Dynamic sealing assembly (20) is installed in rotary shell (23) the movable sealing groove, and is fixing by movable sealing gland (18); Movable sealing gland (18) inboard is provided with dust ring (17), and rotary shell (23) is provided with gland ring (19) with movable sealing gland (18) junction; Glue core terminal pad (13) is installed in central tube (24) lower end, connects by soket head cap screw (15); Glue core terminal pad (13) upper end is provided with glue core terminal pad static seal circle (16), realizes the static seal with central tube; Glue core (14) is installed in glue core terminal pad (13) lower end, connects by carrying the silk screw bolt and nut.
As shown in Figure 3, dynamic sealing assembly (20) involved in the present invention is made up of oil pressure packing (28), spacer ring with holes (31), well pressure-conducting disk root (29) and little spacer ring (30).In swivel control head when work,, lubrication oil enters the contact area of central tube (24) and dynamic sealing assembly (20), formation film lubrication by spacer ring with holes (31); The lubrication oil that bearing bore is indoor is realized lubrication because the effect of pressure can enter into the contact area of oil pressure packing (28) and central tube (24).Simultaneously, the pressure of lubrication oil can be assisted oil pressure packing (28) sealing, and well head pressure can be pressed by service well pressure-conducting disk root (29) sealed well.
As shown in Figure 4, cooling involved in the present invention, lubricant passage way mainly are in rotary shell (23) internal bore, be provided with bearing bore oil-feed runner (35) in following radial bearing (11) position, spacer ring with holes (31) locates to be provided with movable sealing oil-feed runner (34), cooling respectively, lubricating bearings and dynamic sealing assembly (20).After entering the cooling, lubrication oil realization effect of bearing bore, flow out by oil-out (32); The cooling, lubrication oil that enter dynamic sealing assembly (20) flow into bearing bore from oil return runner (33), flow out from oil-out (32) with the oil of cooling, lubricating bearings, go round and begin again, realize bearing and dynamic seal cooling, lubricated.
Shown in Fig. 1,5, clip assembly (2) involved in the present invention comprises left body clip (41), right body clip (40), slip-knot bolt (38), clip bearing pin (42), slip-knot bolt bearing pin (43), lifting bolt (39) and shoulder nut (37).It is characterized in that left body clip (41) is connected by clip bearing pin (42) with right body clip (40), is installed on the hinge seat of housing assembly (3); Lifting bolt (39) is installed on the clip body, is used for the well head lifting operation; Slip-knot bolt (38) is installed on the right body clip (40) by slip-knot bolt bearing pin (43); Rotate slip-knot bolt (38) to left body clip (41) groove, tighten shoulder nut (37), can realize the effect that sticks into of clip assembly (2); Participate in Fig. 6, the clip cross section is a biconical surface structure, is stuck in the conical surface on housing assembly (3) the upper end conical surface and the rotary shell (23), sets upright better effects if.
As shown in Figure 7, housing assembly (3) involved in the present invention is made up of enclosure body (45), casing ring (44), clip back-up block (46), stop screw (47), clip hinge seat (48), hanger (49), casing connecting spool (50), studding bolt (53) and studs (52).It is characterized in that casing ring (44) is installed in the seal groove of enclosure body (45) upper end, realizes the static seal of rotation assembly (1) housing assembly (3); Clip hinge seat (48), clip back-up block (46) and hanger (49) are connected by welding procedure with clip body (45), clip hinge seat (48) provides center of rotation for clip assembly (2), clip back-up block (46) mainly is to give the clip body when opening at clip assembly (2) to support, four hangers (49) uniform with enclosure body (45) face of cylinder on, make things convenient for plant maintenance and well head to install; Stop screw (47) is installed on the clip back-up block (46) by screw thread, and the angle that restriction clip assembly (2) is opened prevents that the clip body breaks away from housing assembly (3); Casing connecting spool (50) is installed on the enclosure body (45) by studding bolt (53) and hex nut with enclosure body (45); Blank flange (51) links by studs (52) and hex nut with casing connecting spool (50).
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1. supporting rotating control head of underbalanced coal bed methane well drilling, comprise rotation assembly (1), clip assembly (2) and housing assembly (3), it is characterized in that: clip assembly (2) is installed on housing assembly (3) upper end, and rotation assembly (1) passes casing ring (44) and is seated in the housing assembly (3); In the groove on slip-knot bolt (38) the screw-in clip body on the described clip assembly (2), twist shoulder nut (37) and close clip, fixing rotation assembly (1), the gap between described casing ring (44) sealing rotation assembly (1) and housing assembly (3).
2. supporting rotating control head of underbalanced coal bed methane well drilling according to claim 1, it is characterized in that: described housing assembly (3) comprises enclosure body (45), casing ring (44), clip back-up block (46), stop screw (47), clip hinge seat (48), hanger (49), casing connecting spool (50), studding bolt (53) and studs (52), adopt enclosure body (45) and by-pass port isolating construction, by-pass port separated make casing connecting spool (50), casing connecting spool (50) is installed on the enclosure body (45) by studding bolt (53) and hex nut with enclosure body (45), casing ring (44) is installed in the seal groove of enclosure body (45) upper end, clip hinge seat (48), clip back-up block (46) is connected by welding procedure with enclosure body (45) with hanger (49), four hangers (49) uniform with enclosure body (45) face of cylinder on, stop screw (47) is installed on the clip back-up block (46) by screw thread, and blank flange (51) links by studs (52) and hex nut with casing connecting spool (50).
3. coal bed gas underbalance according to claim 1 is crept into supporting swivel control head, it is characterized in that: described rotation assembly comprises central tube (24), mud retaining ring (4), bearing cover (6), last radial bearing (8), following radial bearing (11), up-thrust bearing (9), lower thrust-bearing (10), dynamic sealing assembly (20), rotary shell (23), movable sealing gland (18), glue core (14) and glue core terminal pad (13), central tube (24) upper end is equipped with mud retaining ring (4), shaft shoulder place installs both sides thrust bearing (9) and lower thrust-bearing (10) respectively, upper bearing (metal) packing ring (25) is installed on up-thrust bearing (9) one sides, lower bearing packing ring (22) is installed on lower thrust-bearing (10) one sides, last radial bearing (8) is installed on upper bearing (metal) packing ring (25) side, following radial bearing (11) is installed on lower bearing packing ring (22) side, last, shaft block ring (7) is installed in the following radial bearing outside respectively, lower shaft back-up ring (21), bearing, bearing washer, central tube (24) is installed in the rotary shell (23); Bearing cover (6) is connected with rotary shell (23) by hexagon-headed bolt (5); Dynamic sealing assembly (20) is installed in rotary shell (23) the movable sealing groove, and is fixing by movable sealing gland (18); Glue core terminal pad (13) upper end is provided with glue core terminal pad static seal circle (16), realizes the static seal with central tube; Glue core (14) is installed in glue core terminal pad (13) lower end, connects by carrying the silk screw bolt and nut.
4. supporting rotating control head of underbalanced coal bed methane well drilling according to claim 1, it is characterized in that: described clip assembly (2) comprises right body clip (40), left side body clip (41), slip-knot bolt (38), clip bearing pin (42), slip-knot bolt bearing pin (43), lifting bolt (39) and shoulder nut (37), left side body clip (41) is connected by clip bearing pin (42) with right body clip (40), be installed on the hinge seat of housing assembly (3), lifting bolt (39) is installed on the clip body, and slip-knot bolt (38) is installed on the right body clip (40) by slip-knot bolt bearing pin (43).
5. coal bed gas underbalance according to claim 3 is crept into supporting swivel control head, it is characterized in that: described dynamic sealing assembly (20) comprises oil pressure packing (28), spacer ring with holes (31), well pressure-conducting disk root (29) and little spacer ring (30), be installed in rotary shell (23) the movable sealing groove, fixing by movable sealing gland (18).
6. want 3 described supporting rotating control head of underbalanced coal bed methane well drilling according to right, it is characterized in that: described bearing cover (6) outside is provided with bearing cover static seal circle (26), and the inboard is provided with two groups of O RunddichtringOs (27).
7. supporting rotating control head of underbalanced coal bed methane well drilling according to claim 2 is characterized in that: described clip assembly (2) adopts biconical surface structure, is stuck in the conical surface on housing assembly (3) the upper end conical surface and the rotary shell (23).
8. supporting rotating control head of underbalanced coal bed methane well drilling according to claim 5 is characterized in that: described movable sealing gland (18) inboard is provided with dust ring (17), is provided with gland ring (19) with rotary shell (23) junction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010301419 CN101852069B (en) | 2010-02-09 | 2010-02-09 | Supporting rotating control head of underbalanced coal bed methane well drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010301419 CN101852069B (en) | 2010-02-09 | 2010-02-09 | Supporting rotating control head of underbalanced coal bed methane well drilling |
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| CN101852069A true CN101852069A (en) | 2010-10-06 |
| CN101852069B CN101852069B (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010301419 Expired - Fee Related CN101852069B (en) | 2010-02-09 | 2010-02-09 | Supporting rotating control head of underbalanced coal bed methane well drilling |
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| CN103015886A (en) * | 2012-12-29 | 2013-04-03 | 西南石油大学 | Top drive driver of rotating control head |
| CN103939046A (en) * | 2013-01-22 | 2014-07-23 | 中国石油天然气集团公司 | Low-pressure light rotating control head without external cooling lubrication pump station |
| CN104763368A (en) * | 2015-02-06 | 2015-07-08 | 中煤科工集团西安研究院有限公司 | Orifice seal device for large-diameter downhole hammer and reverse circulation construction technology for orifice seal device |
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| CN102518906B (en) * | 2011-12-30 | 2016-06-29 | 沪东中华造船(集团)有限公司 | Installation method for the plastic blind flange of sealing pipe |
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| CN112049598A (en) * | 2020-09-09 | 2020-12-08 | 中国石油天然气集团有限公司 | Novel large shell device for rotary control head |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4285406A (en) * | 1979-08-24 | 1981-08-25 | Smith International, Inc. | Drilling head |
| US5662181A (en) * | 1992-09-30 | 1997-09-02 | Williams; John R. | Rotating blowout preventer |
| CN2405005Y (en) * | 1999-11-24 | 2000-11-08 | 四川石油管理局 | Ratary blow-out preventer for drilling |
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2010
- 2010-02-09 CN CN 201010301419 patent/CN101852069B/en not_active Expired - Fee Related
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| CN103015886B (en) * | 2012-12-29 | 2014-09-10 | 西南石油大学 | Top drive driver of rotating control head |
| CN103015886A (en) * | 2012-12-29 | 2013-04-03 | 西南石油大学 | Top drive driver of rotating control head |
| CN103939046A (en) * | 2013-01-22 | 2014-07-23 | 中国石油天然气集团公司 | Low-pressure light rotating control head without external cooling lubrication pump station |
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| CN104763368A (en) * | 2015-02-06 | 2015-07-08 | 中煤科工集团西安研究院有限公司 | Orifice seal device for large-diameter downhole hammer and reverse circulation construction technology for orifice seal device |
| CN104963651A (en) * | 2015-07-29 | 2015-10-07 | 中铁工程装备集团有限公司 | Novel gushing-prevention device for small-sized orifice |
| CN105840948A (en) * | 2016-05-27 | 2016-08-10 | 沈阳鑫联石化设备有限公司 | Fast-opening blind plate |
| CN108952574A (en) * | 2018-09-18 | 2018-12-07 | 中国石油集团西部钻探工程有限公司 | Sound fluid path attachment device in rotary steering mechanism |
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