CN105804687B - A kind of resistance to anti-creep compression packer of shaking - Google Patents
A kind of resistance to anti-creep compression packer of shaking Download PDFInfo
- Publication number
- CN105804687B CN105804687B CN201610323025.4A CN201610323025A CN105804687B CN 105804687 B CN105804687 B CN 105804687B CN 201610323025 A CN201610323025 A CN 201610323025A CN 105804687 B CN105804687 B CN 105804687B
- Authority
- CN
- China
- Prior art keywords
- packing element
- fluid cylinder
- annular space
- central tube
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000006835 compression Effects 0.000 title claims abstract description 18
- 238000007906 compression Methods 0.000 title claims abstract description 18
- 238000012856 packing Methods 0.000 claims abstract description 90
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 239000007787 solid Substances 0.000 claims abstract description 3
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
- E21B33/1265—Packers; Plugs with fluid-pressure-operated elastic cup or skirt with mechanical slips
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Actuator (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses the resistance to anti-creep compression packer of shaking of one kind, including central tube, packing element set, packing element combination, fluid cylinder mechanism, packing element set is arranged on the outside of the central tube and is clenched admittedly with locking, the packing element combination and fluid cylinder mechanism are arranged on packing element and cover outside and clenched with deblocking solid, also include buffer gear, the buffer gear is installed in the annular space between packing element set and central tube, or the axial end portion of packing element combination is installed on, the packing element set opens up the radial hole being connected with central tube and while is communicated to fluid cylinder inner chamber.The present invention, which is solved, is difficult to resistance vibration, the problem of offsetting big tubing string axial deformation present in prior art.
Description
Technical field
The present invention relates to down-hole plugging instrument, specifically a kind of resistance to anti-creep compression packer of shaking.
Background technology
Waterflooding oil field enters development late stage, interlayer difference aggravation, in order to improve development effectiveness, it is necessary to further strengthen
Fine seperated layer water injection.The conventional hydraulic compression formula packer for above proposing deblocking of current separated-zone water infection oil field tubing string, such packer
Apply and occur that above and below water injection string is wriggled and packing greatly and in the big well of water filling interlayer pressure difference in water injection pressure fluctuation
The problem of device is unsealed automatically, can reduce layering note tubing string layered effect, have impact on water filling layering qualification rate, reduce tubing string and
Kit is in the well life-span, and adding the later stage resumes operation workload.In addition many oil fields also develop various anti-creep at present
Class prolongs long-life instrument, but is all feasible under conditions of small deformation, and when running into big pressure difference, during high-temperature situation, tubing string exists
In the case of HTHP, when particularly meeting with the measure of surrounding oil-water well operation in individual well exploitation and produce alternating pressure, several kms
Tubing string deflection be no longer appropriate for solving from the downhole tool of compensation creep.
Higher requirement is proposed to water injection technological string under the operating modes such as fine layering, long-life, deep-well, HTHP,
Water injection string structure should be simplified, improved in well tool reliability, also to improve tubing string stress, optimize tubing string building ring
Border, therefore devise resistance to anti-creep compression packer of shaking.
The content of the invention
It is an object of the invention to provide the resistance to anti-creep compression packer of shaking of one kind, it is difficult present in prior art to solve
To resist vibration, the problem of offsetting big tubing string axial deformation.
In order to reach above-mentioned purpose, present invention employs following technical scheme, a kind of resistance to anti-creep compression packer of shaking, bag
Include and packing element set is arranged on the outside of central tube, packing element set, packing element combination, fluid cylinder mechanism, the central tube and is clenched admittedly with locking, it is described
Packing element is combined and fluid cylinder mechanism is arranged on the outside of packing element set and it is solid to be clenched with deblocking, in addition to buffer gear, the buffer gear
It is installed in the annular space between packing element set and central tube, or is installed on the axial end portion of packing element combination, the packing element set is with
Heart pipe opens up the radial hole being connected and while is communicated to fluid cylinder inner chamber.
The buffer gear is that disc spring is combined or rubber air bag or compression spring.
Packing element set middle part inwall is provided with step, the annular space that packing element is covered between central tube be separated into annular space epicoele and
Intracavitary on buffer gear, the annular space is respectively provided with annular space cavity of resorption, the annular space in intracavitary and annular space cavity of resorption and is also equipped with injection
Ring, the radial hole being connected is opened up with central tube for connecting packing element set.
Buffer gear in the annular space epicoele is topmost withstood on the stop bit platform that center pipe outer wall is opened up, under the annular space
Buffer gear lower end in chamber is withstood on stop bit cylinder, and stop bit cylinder lower end is seated on tapered sleeve, by cutting between tapered sleeve and central tube
Nail and safety collar are connected.
Buffer gear one end of the axial end portion for being installed on packing element combination withstands on packing element combination end, and the other end is withstood on
On tapered sleeve, it is connected between tapered sleeve and central tube by shear pin and safety collar.
The fluid cylinder mechanism is located at the either above or below that packing element is combined.
The fluid cylinder mechanism of the top combined positioned at packing element includes fluid cylinder, piston, sawtooth set, saw-tooth ring, the fluid cylinder
It is connected, is clenched admittedly with locking with packing element external threading, and sealed with sealing ring, the piston is arranged on ring between fluid cylinder and packing element set
In empty, the sawtooth set be threadedly coupled and being clenched admittedly with locking on the downside of fluid cylinder, described saw-tooth ring installed in fluid cylinder lower end and
Sawtooth is covered between piston in annular space.
The fluid cylinder mechanism of the lower section combined positioned at packing element includes fluid cylinder, piston, sawtooth set, saw-tooth ring, the fluid cylinder
It is connected, is clenched admittedly with locking with packing element external threading, and sealed with sealing ring, the piston is arranged on ring between fluid cylinder and packing element set
In empty, the sawtooth set be threadedly coupled and being clenched admittedly with locking on the downside of fluid cylinder, described saw-tooth ring installed in fluid cylinder lower end and
Sawtooth is covered between piston in annular space；The piston is threadedly coupled the upper centrum of slip mechanism.
The stop bit cylinder lower end external diameter is less than the external diameter that packing element covers lower end, and the tapered sleeve external diameter is not more than outside stop bit cylinder lower end
Footpath, the central tube lower end, which is connected, installs baffle ring, the baffle ring external diameter and slip mechanism external diameter phase on the outside of lower contact, lower contact
Together.
Compared to prior art, the invention has the advantages that：
(1) buffer gear of packing element and pipe string of oil-water well is added, packer working environment is improved, solves packer
The stability for setting unreliable problem, ensureing the effective sealing state of annular space packing element caused by tubing string vibrates.
(2) operating mode of buffering tubing string stress impact, improves other downhole tool working environments, ensures its function and performance,
Extension is in the well life-span.
Brief description of the drawings
Fig. 1 is a kind of structural representation of resistance to anti-creep compression packer of shaking；
Fig. 2, Fig. 3, Fig. 4 are the structure chart of other three kinds of embodiments.
In figure：Central tube 1, sealing ring 2, packing element set 3, fluid cylinder 4, piston 5, sawtooth set 6, the packing element seat of honour 7, packing element 8,10,
Seat 11 under spacer ring 9, packing element, stop bit cylinder 12, safety collar 13, tapered sleeve 14, baffle ring 15, lower contact 16, disc spring combination 17,19,20, note
Enter ring 18, saw-tooth ring 21, slip mechanism 22, spring base cylinder 23, spring 24.
Embodiment
Detailed description for the present invention and technology contents, coordinate brief description of the drawings it is as follows, but accompanying drawing only provide reference with
Purposes of discussion, not for being any limitation as to the present invention.
According to Fig. 1, a kind of resistance to anti-creep compression packer of shaking, the packing element set 3 is enclosed on outside central tube 1, and with sealing ring 2
Sealing, between packing element set 3 and central tube 1 upper annulus be sequentially installed with from top to bottom disc spring combination 17, injection ring 18,
Middle disc spring combination 19, bottom annular space is provided with lower disc spring combination 20 and stop bit cylinder 12, and the fluid cylinder 4 is threadedly coupled with packing element set 3,
Fastened, and sealed with sealing ring 301 with locking nail 401, the piston 5 is arranged between fluid cylinder 4 and packing element set 3 in annular space, point
Not Yong sealing ring 501,502 seal, sawtooth set 6 be threadedly coupled with the downside of fluid cylinder 4 and follows closely 601 fastenings with locking, described
Saw-tooth ring 21 is arranged on the lower end of fluid cylinder 4, and between sawtooth set 6 and piston 5 in annular space, the packing element seat of honour 7 is located at the lower end of piston 5,
Spacing by setting shear pin 701 between sawtooth set 6, seat 11 is arranged on the downside of packing element set 3 under the packing element, and is followed closely with deblocking
1101 fastenings, the packing element 8,10 is arranged under the packing element seat of honour 7 and packing element between seat 11 on packing element set 3, is used between packing element 8,10
Spacer ring 9 is separated, and the safety collar 13 is arranged in 12 lower ends of stop bit cylinder, the groove for being inserted in the outside of central tube 1, the tapered sleeve 14
In under stop bit cylinder 12, fastened between central tube 1 by shear pin 1401, the lower contact 16 is threadedly coupled with central tube 1, described
Baffle ring 15 is connected with the outside screw of lower contact 16, is fastened with locking nail 1501.
Present situation on the downside of step, step surface is provided with the outside of the described upper end of central tube 1 close with 3 upper surfaces of packing element set.
Upper external cylindrical surface is provided with the groove for installing sealing ring 2 in described central tube 1.
Upper external cylindrical surface sets step in described central tube 1, and step radial depth and the size of disc spring 17 are supporting.
The described middle and upper part of central tube 1 is provided with liquid injection hole 101, narrow groove of the lower end external cylindrical surface provided with placement safety collar 13
With the wide groove for installing shear pin 1401.
Described injection ring 18 is that radial direction liquid injection hole 1801 is provided with the middle part of cylinder ring, the outside face of cylinder.
Described packing element covers 3 upper ends and is set to the conical surface, coordinates with the upper end step downside of central tube 1.
Described packing element covers 3 middle and upper parts provided with two layers of step circles cylinder, and top bar face of cylinder middle part is provided with liquid injection hole 302,
The face of cylinder get out of a predicament or an embarrassing situation with coordinating in piston 5.
Described packing element covers 3 middle insides and is provided with cylinder step 303, by middle disc spring combination 19 combined with lower disc spring 20 every
Open.
Described saw-tooth ring 21 is on split ring, the unidirectional serrated face for being enclosed on the external cylindrical surface of piston 5.
Described stop bit cylinder 12 is provided with step surface 1201, and limit packing element set 3 moves down distance.
The described external diameter of baffle ring 15 is more than the external diameter of central tube 1, less than the maximum outside diameter of tapered sleeve 14.
According to Fig. 2, described upper disc spring, which combines 17, middle disc spring combination 19, lower disc spring combination 20, can also use cylinder bullet,
1701st, middle cylindrical spring 1901, lower cylindrical spring 2001 are substituted.
According to Fig. 3, to reach above-mentioned purpose, another scheme of the invention on the basis of such scheme, removes upper dish
Spring combination 17, middle disc spring combination 19, lower disc spring combination 20, injection ring 18 and stop bit cylinder 12, increase between packing element set 3 and tapered sleeve 14
Plus spring 24 and spring safety cylinder 23, spring safety cylinder 23 is enclosed on outside central tube 1, and the upper end of ring 13, length are cut positioned at deblocking
Less than the installation length of spring 24, diameter is more than packing element and covers 3 lower end external diameters, and less than the path of spring 24, the spring 24 is enclosed on spring
Outside safety tube 23, seal groove is provided with the outside of the middle and lower part of central tube 1, the center seal pipe of sealing ring 1202 and packing element set 3 are installed
Between bottom annular space, the packing element covers 3 upper inners and is provided with seal groove, install the center seal pipe 1 of sealing ring 2 and packing element set 3 it
Between upper annulus.
According to Fig. 4, to reach above-mentioned purpose, the third scheme of the invention, on the basis of the first scheme, by packing element
8 and 10, spacer ring 9 be transferred to packing element and cover 3 upper outers, piston 5, fluid cylinder 4, sawtooth set 6, saw-tooth ring 21 are still in 302 pairs of liquid injection hole
Position is answered, stop bit cylinder 12, safety collar 13, tapered sleeve 14 are arranged on the middle and lower part of central tube 1, baffle ring 15 and the middle and lower part screw thread of central tube 1
Connection, and fastened with locking nail 1501, the lower end of piston 5 is threadedly coupled the upper centrum of slip mechanism 22, the stop bit cylinder 12
Lower end external diameter is less than the external diameter that packing element covers 3 lower ends, and the external diameter of tapered sleeve 14 is not more than stop bit 12 lower end external diameters of cylinder, the baffle ring 15
External diameter is identical with the external diameter of slip mechanism 22.
In field conduct, according to Fig. 1, hydraulic pressure is beaten in central tube 1, liquid flows through liquid injection hole 101,1801,302 and enters packing element
Annular space between set 3 and fluid cylinder 4, driving piston 5 is moved down, and forces shear pin 701 to be cut, and piston 5 continues to move down under the promotion packing element seat of honour 7
Move, the stress of packing element 8 and 10 is expanded outwardly, packing oil pipe and casing annulus.When oil pipe stretches up or down under external force
When, because disc spring combines 17,19,20 cushioning effect and stop bit 12 position-limiting actions of cylinder, packing element 8 and 9 is not by big impulsive force shadow
Ring, ensure that annular space is reliably sealed.Continue to beat hydraulic pressure during deblocking, in central tube 1, force deblocking shear pin 1101 to be cut, packing element 8 and 9
Shunk under self-recovery power, complete deblocking, can also be unsealed by upper lower center tube 1.
According to Fig. 4, hydraulic pressure is beaten in central tube 1, fluid cylinder 4, which is moved up, forces packing element 8 and 9 to set, piston 5, which moves down promotion cone, to be made
Slip mechanism 22, which is realized, sits card motion, and unfreezing and deblocking are realized by above carrying central tube 1 during deblocking.
Presently preferred embodiments of the present invention is the foregoing is only, is not used to limit the scope of the claims of the present invention, other are with this
The equivalence changes of the patent spirit of invention, all should all belong to the scope of the claims of the present invention.
Claims (6)
1. a kind of resistance to anti-creep compression packer of shaking, including the combination of central tube, packing element set, packing element, fluid cylinder mechanism, the central tube
Outside sets packing element set, is sealed between central tube and packing element set with sealing ring, and packing element combination and fluid cylinder mechanism are arranged on packing element and cover outer
Side, between fluid cylinder mechanism and packing element set with it is locking clench solid, packing element and combine to be clenched with deblocking between packing element set consolidate, its feature exists
In in addition to buffer gear, the buffer gear is installed in the annular space between packing element set and central tube；The packing element set is with
Heart pipe opens up the radial hole being connected and while is communicated to fluid cylinder inner chamber；The buffer gear is that disc spring is combined or rubber air bag
Or compression spring, packing element set middle part inwall is provided with step, and packing element, which is covered the annular space between central tube, is separated into annular space
Intracavitary on buffer gear, the annular space is respectively provided with epicoele and annular space cavity of resorption, the annular space in intracavitary and annular space cavity of resorption also to install
There is injection ring, the radial hole being connected is opened up with central tube for connecting packing element set.
2. the resistance to anti-creep compression packer of shaking of one kind according to claim 1, it is characterised in that in the annular space epicoele
Buffer gear is topmost withstood on the stop bit platform that center pipe outer wall is opened up, and the buffer gear lower end in the annular space cavity of resorption is withstood on only
On the cylinder of position, stop bit cylinder lower end is seated on tapered sleeve, is connected between tapered sleeve and central tube by shear pin and safety collar.
3. the resistance to anti-creep compression packer of shaking of one kind according to claim 1, it is characterised in that the fluid cylinder mechanism is located at
The either above or below of packing element combination.
4. the resistance to anti-creep compression packer of shaking of one kind according to claim 3, it is characterised in that described to be located at packing element combination
Top fluid cylinder mechanism include fluid cylinder, piston, sawtooth set, saw-tooth ring, the fluid cylinder is connected with packing element external threading, with locking nail
Fastening, and sealed with sealing ring, the piston is arranged between fluid cylinder and packing element set in annular space, on the downside of the sawtooth set and fluid cylinder
It is threadedly coupled and is clenched admittedly with locking, described saw-tooth ring is arranged between fluid cylinder lower end and sawtooth set and piston in annular space.
5. the resistance to anti-creep compression packer of shaking of one kind according to claim 3, it is characterised in that described to be located at packing element combination
Lower section fluid cylinder mechanism include fluid cylinder, piston, sawtooth set, saw-tooth ring, the fluid cylinder is connected with packing element external threading, with locking nail
Fastening, and sealed with sealing ring, the piston is arranged between fluid cylinder and packing element set in annular space, on the downside of the sawtooth set and fluid cylinder
It is threadedly coupled and is clenched admittedly with locking, described saw-tooth ring is arranged between fluid cylinder lower end and sawtooth set and piston in annular space；Institute
State the upper cone that piston is threadedly coupled slip mechanism.
6. the resistance to anti-creep compression packer of shaking of one kind according to claim 2, it is characterised in that outside the stop bit cylinder lower end
Footpath is less than the external diameter that packing element covers lower end, and the tapered sleeve external diameter is not more than stop bit cylinder lower end external diameter, under the central tube lower end connection
Baffle ring is installed on the outside of joint, lower contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323025.4A CN105804687B (en) | 2016-05-13 | 2016-05-13 | A kind of resistance to anti-creep compression packer of shaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610323025.4A CN105804687B (en) | 2016-05-13 | 2016-05-13 | A kind of resistance to anti-creep compression packer of shaking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105804687A CN105804687A (en) | 2016-07-27 |
| CN105804687B true CN105804687B (en) | 2017-09-22 |
Family
ID=56451325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610323025.4A Active CN105804687B (en) | 2016-05-13 | 2016-05-13 | A kind of resistance to anti-creep compression packer of shaking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105804687B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605424A (en) * | 2017-10-19 | 2018-01-19 | 中国海洋石油总公司 | From compression high temperature downhole packer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2581685Y (en) * | 2002-10-31 | 2003-10-22 | 大庆油田有限责任公司 | Well packer capable of flushing well |
| CN2693944Y (en) * | 2003-11-28 | 2005-04-20 | 大港油田集团有限责任公司 | Hydraulic cup packer |
| CA2503790A1 (en) * | 2004-11-12 | 2006-05-12 | Bruce Cherewyk | Packoff nipple for a wellhead isolation tool |
| CN101713281A (en) * | 2008-10-07 | 2010-05-26 | 刘景斌 | self-expansion bonding packer |
| CN203347738U (en) * | 2013-06-04 | 2013-12-18 | 克拉玛依市红都有限责任公司 | Anti-blocking large channel backwashing packer |
| CN104790903B (en) * | 2015-03-18 | 2017-11-03 | 北京众博达石油科技有限公司 | Straddle type packer capable of repeatedly setting |
| CN204804754U (en) * | 2015-06-08 | 2015-11-25 | 中国石油天然气股份有限公司 | Eccentric separate layer water injection packer |
| CN105464614B (en) * | 2015-12-16 | 2018-08-10 | 天津市龙新石油机械制造股份有限公司 | Step-by-step releasable flushing packer |
-
2016
- 2016-05-13 CN CN201610323025.4A patent/CN105804687B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105804687A (en) | 2016-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101812981B (en) | Mechanical underground all-in-one blowout preventer | |
| CN104265234B (en) | Constant pressure stepped-depacking packer | |
| CN104453757B (en) | Thick oil steam flooding and deblocking two-way anchoring tubing anchor | |
| NO20110926A1 (en) | Wake type surface seal and wellhead system including the same | |
| CN104074491A (en) | Oil pipe bridge plug | |
| US7699111B2 (en) | Float collar and method | |
| CN105804687B (en) | A kind of resistance to anti-creep compression packer of shaking | |
| CN207813539U (en) | Hydraulic anchoring device | |
| CN202165053U (en) | Novel hydraulic control underground sliding sleeve switch valve | |
| US20150176354A1 (en) | Liner hanger top packer | |
| CN206928922U (en) | Gradually deblocking is segmented releasing tool | |
| CN203383783U (en) | Closed-type bottom reversing switch | |
| RU75423U1 (en) | WELL SEALER PACKER | |
| US20110155396A1 (en) | System, method, and device for actuating a downhole tool | |
| CN209539319U (en) | Piston type tests envelope well packer capable of flushing well certainly | |
| CN207813559U (en) | The self-priming external packer of pipe of cement | |
| CN202300303U (en) | Full-balanced compression-type step-by-step release packer | |
| CN204040963U (en) | Liner hanger | |
| CN200946464Y (en) | Rigid centralizer for straight well and directional well | |
| US11346179B2 (en) | Downhole tool with cast body securable in a tubular | |
| CN113482569B (en) | Multistage disconnect-type grout leaking stoppage instrument | |
| RU2311526C2 (en) | Shutoff valve | |
| CN107100572A (en) | Gradually deblocking is segmented releasing tool | |
| RU2262582C1 (en) | Detachable connection of pressure pipe string in well | |
| CN104405331B (en) | A kind of ocean deepwater well tubing packer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |