CN103670326A - Naked eye packer - Google Patents
Naked eye packer Download PDFInfo
- Publication number
- CN103670326A CN103670326A CN201310752629.7A CN201310752629A CN103670326A CN 103670326 A CN103670326 A CN 103670326A CN 201310752629 A CN201310752629 A CN 201310752629A CN 103670326 A CN103670326 A CN 103670326A
- Authority
- CN
- China
- Prior art keywords
- ring
- mandrel
- packing element
- joint
- 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.)
- Granted
Links
Images
Landscapes
- Sealing Devices (AREA)
- Gasket Seals (AREA)
Abstract
The invention discloses a naked eye packer. The naked eye packer comprises a core shaft with an axial through hole, wherein one end of the core shaft is connected with a first joint and the other end is connected with a second joint; a left shearing ring, a limit ring, a first auxiliary rubber cylinder pressing ring, a first auxiliary rubber cylinder, a first packing ring, a main rubber cylinder, a second rubber cylinder, a second rubber cylinder rubber cylinder, a right shearing ring, a piston and a check ring are sequentially sleeved on the core shaft from the first joint; a first pressure transmitting hole and a first slip which correspond to the left shearing ring are formed in the core shaft; a supporting ring is arranged between the main rubber cylinder and the core shaft; an outer sleeve is sleeved on the piston; one end of the outer sleeve is connected with the second joint and the other end is connected with the shearing ring; a second slip corresponding to the piston is arranged on the core shaft; a second pressure transmitting hole is also formed in the core shaft and is positioned between the check ring and the piston. The rubber cylinder is high in loading capacity.
Description
Technical field
The present invention relates to a kind of open hole packer, belong to the downhole tool technical field of oil, Wellbore of Gas Wells operation.
Background technology
The barefoot completion segmentation transformation of the straight well of oil gas field or horizontal well adopts open hole packer to carry out sectional well completion and transformation, can take modification measures targetedly to each payzone, or increase by acid strength or increase sand fracturing scale, thereby really realize each payzone Duan Jun, reach efficient solution except nearly well stops up, the object of communication reservoir.Open hole packer is one of important tool in barefoot completion segmentation reforming technology, has played the key effect of packing bore hole Reservoir Section, and in the face of down-hole complex environment, the packing element performance of open hole packer is one of key factor determining effectively packing.The packing element of prior art packer does not normally have safeguard measure, after down-hole is setting may because when construction tubing string upper and lower play packing element is damaged, cause bearing capacity greatly to reduce, even can seal failure, can not effectively to reservoir, carry out packing.
The problem and the defect that in use exist in view of above-mentioned existing packer, the inventor relies on actively research and innovation in addition of working experience for many years and abundant professional knowledge, finally researched and developed a kind of open hole packer, the problem and the defect that to solve prior art, exist.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the invention provides a kind of open hole packer, packing rubber sleeve bearing capacity is strong.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
Open hole packer, comprise the mandrel with axially extending bore, one end of mandrel connects the first joint, the other end connects the second joint, on mandrel, from the first joint to the second joint, is socketed successively left shearing ring, spacing ring, the first auxiliary packing element pressure ring, the first auxiliary packing element, the first spacer ring, main packing element, the second spacer ring, the second auxiliary packing element, the second auxiliary packing element pressure ring, right shearing ring, piston and locating snap ring, wherein one end of left shearing ring is between the first joint and mandrel, and be slidably connected with the first joint and stem seal, left shearing ring is connected by the first shear pin with the first joint, the common first pressure transmission chamber that forms of left shearing ring and the first joint and mandrel, has the first pressure transmission hole that is communicated with the first pressure transmission chamber and mandrel inside on mandrel, the inner surface of left shearing ring has dentation slip insert, has the first slip groove on mandrel, is provided with the first slips in the first slip groove, has the retaining slips tooth matching with slips tooth on left shearing ring on described the first slips, between main packing element and mandrel, be provided with support ring, support ring is positioned at the middle part of main packing element, in the outside of piston, cover has urceolus, one end of urceolus is connected with the second joint sealing, the other end of urceolus is connected by the second shear pin with right shearing ring, between piston and mandrel and urceolus, slipper seal is connected, on the inwall of piston, there is dentation slip insert, on mandrel, have the second slip groove, be provided with the second slips in the second slip groove, described the second slips has the retaining slips tooth matching with slips tooth on piston, on described mandrel, also there is the second pressure transmission hole, described the second pressure transmission hole is between locating snap ring and piston, described locating snap ring and urceolus and mandrel axial restraint, wherein the first auxiliary packing element comprises packing element body and metal coating ring, described metal coating is located on one end of packing element body, the internal face of the outside wall surface of packing element body and described metal coating ring is suitable, the cover of the first auxiliary packing element has one end of metal coating ring to stretch in the first pressure ring, the described second auxiliary packing element is identical with the first auxiliary packing element structure, the cover of the second auxiliary packing element has one end of metal coating ring to stretch in the second pressure ring.
As preferably, described metal coating ring is divided into isometrical section and extension diameter section vertically, described isometrical section cylindrical, the diameter of described extension diameter section increases gradually and is cone barrel, one end of described extension diameter section diameter minimum is connected with described isometrical section.
As preferably, described isometrical section is connected by linkage section with described extension diameter section, and described linkage section extends radially outward and forms from the end of isometrical section.
As preferably, the material of described metal coating ring is No. 10 steel.
As preferably, the wall thickness of described metal coating ring is 2mm to 4mm.
As preferably, the wall thickness of described metal coating ring is 3mm.
As preferably, the bus of described extension diameter section and the angle between axis are 45 °.
As preferably, between described left shearing ring and the first joint, and between left shearing ring and mandrel, be respectively arranged with the first O-ring seals and seal.
As preferably, between described piston and urceolus and mandrel, be provided with the second O-ring seals and seal.
As preferably, between described urceolus and the second joint, by being set, the 3rd O-ring seals seals.
As preferably, between described mandrel and the first joint and the second joint for being threaded.
Compared with prior art, beneficial effect of the present invention is:
Open hole packer of the present invention transmits hydraulic pressure by the first pressure transmission hole and the second pressure transmission hole, and then left shearing ring and the piston of pushing set on mandrel cut off shear pin separately and move to middle part, the mechanical presses power of generation finally makes to be positioned at the packing element Expansion sealing bore hole Reservoir Section at middle part.Meanwhile, the dentalation with slip insert of design makes not deblocking of main packing element after setting, and bearing capacity is high; Setting process completed in moment, saved the operating time.Structure design is ingenious, reliable, through overtesting, can, to horizontal well or the effective packing of straight well bore hole Reservoir Section, guarantee each payzone section security implementation operation.Metal coating ring in the present invention can improve the bearing capacity of packing element, and the packing element of prior art is not in the situation that there is no safeguard measure, and packing element bearing capacity is 40MPa～50MPa; And same packing element packing element bearing capacity after metal coating ring of the present invention is installed is 60MPa～70MPa; After packer set, metal ring of the present invention can be supported on sleeve pipe or the bore hole borehole wall, can effectively stablize tubing string, and packing element has been played to protective effect, has greatly increased the bearing capacity of packing element.
Accompanying drawing explanation
Fig. 1 is that the structure of open hole packer of the present invention is partly cutd open figure.
Fig. 2 is the structural representation of the first auxiliary packing element in the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
Fig. 1 is that the structure of open hole packer of the present invention is partly cutd open figure.Fig. 2 is the structural representation of the first auxiliary packing element in the present invention.As depicted in figs. 1 and 2, open hole packer comprises: the mandrel 17 with axially extending bore, one end of mandrel 17 connects the first joint 1, the other end of mandrel 17 connects the second joint 18, on mandrel 17, from the first joint 1 to second joint 18, is socketed successively left shearing ring 3, auxiliary packing element pressure ring the 22, the first auxiliary packing element 6 of spacing ring 5, first, the first spacer ring 7, main packing element 9, second spacer ring the 23, second auxiliary auxiliary packing element pressure ring 11 of packing element 10, second, right shearing ring 12, piston 14 and locating snap ring 15, wherein one end of left shearing ring 3 is stretched between the first joint 1 and mandrel 17, and left shearing ring 3 and the first joint 1 and mandrel 17 sealed sliding are dynamically connected, left shearing ring 3 is connected by the first shear pin 2 with the first joint 1, the common first pressure transmission chamber 24 that forms of left shearing ring 3 and the first joint 1 and mandrel 17, has the first pressure transmission hole 25 that is communicated with the first pressure transmission chamber 24 and mandrel 17 inside on mandrel 17, the inner surface of left shearing ring 3 has dentation slip insert, has the first slip groove on mandrel 17, is provided with and on the first slips 4, the first slips 4, has the retaining slips tooth matching with slips tooth on left shearing ring 3 in the first slip groove, between main packing element 9 and mandrel 17, be provided with support ring 8, support ring 8 is positioned at the middle part of main packing element 9, in the outside of piston 14, cover has urceolus 16, one end of urceolus 16 and the second joint 18 are tightly connected, the other end of urceolus 14 is connected by the second shear pin 13 with right shearing ring 12, between piston 14 and mandrel 17 and urceolus 16, slipper seal is connected, on the inwall of piston 14, there is dentation slip insert, on mandrel 17, have the second slip groove, in the second slip groove, be provided with the second slips 26, the second slips 26 and there is the retaining slips tooth matching with slips tooth on piston 14, on mandrel 17, also there is the second pressure transmission hole 27, the second pressure transmission hole 27 is between locating snap ring 15 and piston 14, locating snap ring 15 and urceolus 16 and mandrel 17 axial restraints, wherein the first auxiliary packing element 6 comprises packing element body 61 and metal coating ring 62, metal coating ring 62 is placed on one end of packing element body 61, the internal face of the outside wall surface of packing element body 61 and metal coating ring 62 is suitable, the cover of the first auxiliary packing element 6 has one end of metal coating ring 62 to stretch in the first pressure ring 22, the second auxiliary packing element 10 is identical with the first auxiliary packing element 6 structures, the cover of the second auxiliary packing element 10 has one end of metal coating ring 62 to stretch in the second pressure ring 11.
Open hole packer of the present invention transmits hydraulic pressure by the first pressure transmission hole and the second pressure transmission hole, and then left shearing ring and the piston of pushing set on mandrel cut off shear pin separately and move to middle part, the mechanical presses power of generation finally makes to be positioned at the packing element Expansion sealing bore hole Reservoir Section at middle part.Meanwhile, the dentalation with slip insert of design makes not deblocking of main packing element after setting, and bearing capacity is high; Setting process completed in moment, saved the operating time.Structure design is ingenious, reliable, through overtesting, can, to horizontal well or the effective packing of straight well bore hole Reservoir Section, guarantee each payzone section security implementation operation.Metal coating ring in the present invention can improve the bearing capacity of packing element, and the packing element of prior art is not in the situation that there is no safeguard measure, and packing element bearing capacity is 40MPa～50MPa; And same packing element packing element bearing capacity after metal coating ring of the present invention is installed is 60MPa～70MPa; After packer set, metal ring of the present invention can be supported on sleeve pipe or the bore hole borehole wall, can effectively stablize tubing string, and packing element has been played to protective effect, has greatly increased the bearing capacity of packing element.
As one of above-described embodiment preferably; referring to Fig. 2, metal coating ring 62 is divided into isometrical section 621 and extension diameter section 622 vertically, and isometrical section 621 cylindrical; the diameter of extension diameter section 622 increases gradually and is cone barrel, and one end of extension diameter section 622 diameter minimums is connected with isometrical section 1.The metal coating ring of this kind of structure can be supported on sleeve pipe or the bore hole borehole wall after packing element expansion is setting, can effectively stablize tubing string, and packing element has been played to protective effect, has greatly increased the bearing capacity of packing element.Further, isometrical section 1 is connected by linkage section 3 with extension diameter section 2, and linkage section 3 extends radially outward and forms from the end of isometrical section 1.Can more effectively packing element body be supported and be protected.In the present embodiment, the material of metal coating ring is No. 10 steel.Can expand and distortion thereupon with packing element, thereby packing element is supported and protected.In the present embodiment, the wall thickness of metal coating ring is 2mm to 4mm, is preferably 3mm.The bus of extension diameter section and the angle between axis are 40 °～60.Preferably, the bus of extension diameter section and the angle between axis are 45 °.Can better to packing element, support and protect.Another kind as above-described embodiment is preferred, on the extension diameter section of metal coating ring, along bus, has otch, and otch is divided into 3～8 lobes by extension diameter section.Can certainly be more, as otch is divided into 12 lobes by extension diameter section.Generally be divided into 6 lobes comparatively suitable.Like this can be when packing element expand, extension diameter section expands outwardly thereupon, and extension diameter section is butted on sleeve pipe or shaft in wall is helped, protected packing element.
Between left shearing ring 3 and the first joint 1, and between left shearing ring 3 and mandrel 17, be respectively arranged with the first O-ring seals 19,20 and seal.Between piston 14 and urceolus 16 and mandrel 17, being provided with the second O-ring seals 28 seals.Between urceolus 16 and the second joint 18, by being set, the 3rd O-ring seals 29 seals.Between mandrel 17 and the first joint 1 and the second joint 18 for being threaded.Between support ring 8 and mandrel 17, be provided with sealing ring 21.On mandrel 17, have inclined-plane, this inclined-plane stops locating snap ring 15 to move to the first joint, has convex annular stupefied 161 on the inwall of urceolus 16, and this convex annular stupefied 161 is stuck between locating snap ring 15 and the second joint 18.
Above embodiment is only exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection domain, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (10)
1. open hole packer, it is characterized in that, comprise: the mandrel with axially extending bore, one end of mandrel connects the first joint, the other end connects the second joint, on mandrel, from the first joint to the second joint, is socketed successively left shearing ring, spacing ring, the first auxiliary packing element pressure ring, the first auxiliary packing element, the first spacer ring, main packing element, the second spacer ring, the second auxiliary packing element, the second auxiliary packing element pressure ring, right shearing ring, piston and locating snap ring, wherein one end of left shearing ring is between the first joint and mandrel, and be slidably connected with the first joint and stem seal, left shearing ring is connected by the first shear pin with the first joint, the common first pressure transmission chamber that forms of left shearing ring and the first joint and mandrel, has the first pressure transmission hole that is communicated with the first pressure transmission chamber and mandrel inside on mandrel, the inner surface of left shearing ring has dentation slip insert, has the first slip groove on mandrel, is provided with the first slips in the first slip groove, has the retaining slips tooth matching with slips tooth on left shearing ring on described the first slips, between main packing element and mandrel, be provided with support ring, support ring is positioned at the middle part of main packing element, in the outside of piston, cover has urceolus, one end of urceolus is connected with the second joint sealing, the other end of urceolus is connected by the second shear pin with right shearing ring, between piston and mandrel and urceolus, slipper seal is connected, on the inwall of piston, there is dentation slip insert, on mandrel, have the second slip groove, be provided with the second slips in the second slip groove, described the second slips has the retaining slips tooth matching with slips tooth on piston, on described mandrel, also there is the second pressure transmission hole, described the second pressure transmission hole is between locating snap ring and piston, described locating snap ring and urceolus and mandrel axial restraint, wherein the first auxiliary packing element comprises packing element body and metal coating ring, described metal coating is located on one end of packing element body, the internal face of the outside wall surface of packing element body and described metal coating ring is suitable, the cover of the first auxiliary packing element has one end of metal coating ring to stretch in the first pressure ring, the described second auxiliary packing element is identical with the first auxiliary packing element structure, the cover of the second auxiliary packing element has one end of metal coating ring to stretch in the second pressure ring.
2. open hole packer according to claim 1; it is characterized in that, described metal coating ring is divided into isometrical section and extension diameter section vertically, described isometrical section cylindrical; the diameter of described extension diameter section increases gradually and is cone barrel, and one end of described extension diameter section diameter minimum is connected with described isometrical section.
3. open hole packer according to claim 2, is characterized in that, described isometrical section is connected by linkage section with described extension diameter section, and described linkage section extends radially outward and forms from the end of isometrical section.
4. open hole packer according to claim 2, is characterized in that, the material of described metal coating ring is No. 10 steel.
5. open hole packer according to claim 2, is characterized in that, the wall thickness of described metal coating ring is 2mm to 4mm.
6. open hole packer according to claim 1, is characterized in that, the bus of described extension diameter section and the angle between axis are 45 °.
7. open hole packer according to claim 1, is characterized in that, between described left shearing ring and the first joint, and between left shearing ring and mandrel, is respectively arranged with the first O-ring seals and seals.
8. open hole packer according to claim 1, is characterized in that, is provided with the second O-ring seals and seals between described piston and urceolus and mandrel.
9. open hole packer according to claim 1, is characterized in that, between described urceolus and the second joint, by the 3rd O-ring seals is set, seals.
10. open hole packer according to claim 1, is characterized in that, between described mandrel and the first joint and the second joint for being threaded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310752629.7A CN103670326B (en) | 2013-12-31 | 2013-12-31 | Open hole packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310752629.7A CN103670326B (en) | 2013-12-31 | 2013-12-31 | Open hole packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103670326A true CN103670326A (en) | 2014-03-26 |
| CN103670326B CN103670326B (en) | 2016-03-16 |
Family
ID=50309016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310752629.7A Active CN103670326B (en) | 2013-12-31 | 2013-12-31 | Open hole packer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103670326B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927382A (en) * | 2020-08-07 | 2020-11-13 | 中国石油大学(北京) | Packer (CN) |
| CN113123753A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | Soluble easy-to-drill open hole packer and using method thereof |
| CN114458223A (en) * | 2021-07-06 | 2022-05-10 | 中海油能源发展股份有限公司 | Layered packer for large-drift-diameter water injection and using method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201513153U (en) * | 2009-09-09 | 2010-06-23 | 大连职业技术学院 | Supporting expansion-sealing electric packer |
| CN101864922A (en) * | 2010-07-02 | 2010-10-20 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Compression type dual-sealing open hole packer |
| CN102071900A (en) * | 2010-11-23 | 2011-05-25 | 中国石油天然气股份有限公司 | Self-constant pressure expanding open hole packer |
| US20110272138A1 (en) * | 2007-10-26 | 2011-11-10 | Gustavo Martin Jara | Hydraulic packer constructed entirely of glass-fiber composition and stainless steel |
| CN103184850A (en) * | 2011-12-29 | 2013-07-03 | 安东石油技术（集团）有限公司 | Bidirectional seat seal hook-wall packer, preparation method thereof and shaft circumferential packing method |
| CN203716919U (en) * | 2013-12-31 | 2014-07-16 | 安东石油技术（集团）有限公司 | Open hole packer |
-
2013
- 2013-12-31 CN CN201310752629.7A patent/CN103670326B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110272138A1 (en) * | 2007-10-26 | 2011-11-10 | Gustavo Martin Jara | Hydraulic packer constructed entirely of glass-fiber composition and stainless steel |
| CN201513153U (en) * | 2009-09-09 | 2010-06-23 | 大连职业技术学院 | Supporting expansion-sealing electric packer |
| CN101864922A (en) * | 2010-07-02 | 2010-10-20 | 中国石油集团川庆钻探工程有限公司井下作业公司 | Compression type dual-sealing open hole packer |
| CN102071900A (en) * | 2010-11-23 | 2011-05-25 | 中国石油天然气股份有限公司 | Self-constant pressure expanding open hole packer |
| CN103184850A (en) * | 2011-12-29 | 2013-07-03 | 安东石油技术（集团）有限公司 | Bidirectional seat seal hook-wall packer, preparation method thereof and shaft circumferential packing method |
| CN203716919U (en) * | 2013-12-31 | 2014-07-16 | 安东石油技术（集团）有限公司 | Open hole packer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123753A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | Soluble easy-to-drill open hole packer and using method thereof |
| CN111927382A (en) * | 2020-08-07 | 2020-11-13 | 中国石油大学(北京) | Packer (CN) |
| CN111927382B (en) * | 2020-08-07 | 2022-04-29 | 中国石油大学(北京) | Packer (CN) |
| CN114458223A (en) * | 2021-07-06 | 2022-05-10 | 中海油能源发展股份有限公司 | Layered packer for large-drift-diameter water injection and using method thereof |
| CN114458223B (en) * | 2021-07-06 | 2023-10-31 | 中海油能源发展股份有限公司 | Layered packer for large-drift-diameter water injection and application method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103670326B (en) | 2016-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202181876U (en) | Drillable composite bridge plug | |
| CN103184850B (en) | Two-way setting hanging packer and preparation method thereof and pit shaft hoop packing method | |
| CN103397863B (en) | Double acting compression packer and using method thereof | |
| CN203716919U (en) | Open hole packer | |
| CN205840807U (en) | A kind of reducing rolling wheel centralizer | |
| CN103670326B (en) | Open hole packer | |
| CN104088599A (en) | Expansion bridge blinding method for outer packer of cement paste filled pipe | |
| CN203230376U (en) | Compression type setting packer capable of realizing multiple setting and unsetting | |
| CN202745731U (en) | Hydraulic centralizer | |
| CN104088601A (en) | Channeling sealing tool for outer packer of cement paste filled pipe | |
| CN203188969U (en) | Thermal washing paraffin removal packer | |
| CN105696953A (en) | Hydraulic setting anti-pollution well washing device | |
| CN201705216U (en) | Clamp spring type salvageable bottom plug for expansion pipe | |
| CN203961897U (en) | A kind of cement paste filling tube external packer envelope is altered instrument | |
| CN203420665U (en) | Double-acting compression type packer | |
| CN203626705U (en) | Side-drilling slim hole fracturing packer | |
| CN203008808U (en) | Casing centralizer with variable diameter and rotational flow function | |
| CN104963640A (en) | Horizontal well coiled tubing lock type hydraulic bit feeding and alarming system | |
| CN204782910U (en) | From inflation formula thermal recovery bore hole metal packer | |
| CN204082061U (en) | Fracture used high-pressure sand-proof hydraulic anchor | |
| CN203702076U (en) | Combined rubber sleeve packer | |
| CN103104213A (en) | High-temperature high-pressure testing packer | |
| CN203939478U (en) | Hydraulic expansion type high-temperature well completion packer | |
| CN208152979U (en) | A kind of bi-directional slip formula external casing packer | |
| CN209892151U (en) | Novel bidirectional compression packer structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181228 Address after: No. 309, Second Street, Middle and South China, West District, Tianjin Binhai Economic and Technological Development Zone, 300450 Patentee after: Tianjin An Dong petroleum machinery Manufacturing Co., Ltd Address before: 100102 No. 8 Pingcui West Road, Donghuqu, Chaoyang District, Beijing Patentee before: Anton Oilfield Services (Group) Ltd. |
|
| TR01 | Transfer of patent right |