CN103850653A - Heat-insulating oil sleeve and manufacturing method thereof - Google Patents
Heat-insulating oil sleeve and manufacturing method thereof Download PDFInfo
- Publication number
- CN103850653A CN103850653A CN201410053038.5A CN201410053038A CN103850653A CN 103850653 A CN103850653 A CN 103850653A CN 201410053038 A CN201410053038 A CN 201410053038A CN 103850653 A CN103850653 A CN 103850653A
- Authority
- CN
- China
- Prior art keywords
- intervalve
- pipe
- inner tube
- heat
- outer tube
- 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
- Thermal Insulation (AREA)
Abstract
The invention relates to a heat-insulating oil sleeve. The heat-insulating oil sleeve is characterized by comprising an outer pipe, an intermediate pipe and an inner pipe which are sleeved in a clearance fit way; internal threads are machined at one end of the intermediate pipe; external threads are machined at the other end of the intermediate pipe; one end, provided with the internal threads, of the intermediate pipe is welded with the outer pipe at a pipe end, and is welded with the inner pipe at the length position of the preserved internal threads; one end, provided with the external threads, of the intermediate pipe is welded with the outer pipe at the length position of the preserved external threads, and is welded with the inner pipe at the pipe end; an annular cavity formed by the outer pipe and the intermediate pipe is filled with a heat-insulating material and is vacuumized to form a first heat-insulating layer; an annular cavity formed between the intermediate pipe and the inner pipe is vacuumized and is injected with inert gas to form a second heat-insulating layer. A manufacturing method for the heat-insulating oil sleeve comprises the following steps in sequence: performing pretreatment on the three pipes, sleeving and welding the inner pipe and the intermediate pipe, treating the annular cavity between the inner pipe and the intermediate pipe, sleeving and welding the outer pipe and the intermediate pipe, treating the annular cavity between the outer pipe and the intermediate pipe, testing an apparent heat conductivity coefficient and machining threads at the two ends of the intermediate pipe. The heat-insulating oil sleeve has a structure with three layers of steel tubes and double layers of heat-insulating layers, high heat insulation performance, long heat insulation life and high performance.
Description
Technical field
The present invention relates to a kind of heat insulation tubing and casing and manufacture method thereof, be specifically related to steam injection, oil tool and the manufacture method thereof of heavy crude heat extraction operation in a kind of petroleum industry, belong to technical field of petroleum extraction
Background technology
Along with the development of oil exploitation industry and the continuous increase of consumption of petroleum amount, heavy crude producing has become the main output source of domestic and international oil company, and steam soak and two kinds of techniques of steam flooding are taked in thickened oil recovery conventionally, and these two kinds of techniques all need to use insulated tubing and sleeve pipe as steam injection oil tool.Current insulated tubing all according to or produce with reference to the disclosed one of Chinese patent (application number 97115719.7) " vacuum heat-insulation oil pipe and manufacturing process thereof ", product is by box cupling, insulation bushing, bushing pipe, outer tube, inner tube, isolation layer, wiper block, inhale the compositions such as hydrogen agent, wherein insulating layer structure is: inner tube laminated aluminium foil, glass cross interval is wound around, annular space vacuumizes, and add and inhale hydrogen agent, the heat insulation tubing and casing apparent heat conductivity of this kind of fabrication process is better, at protection oil well casing, reduce wellbore heat loss, lifting note is adopted effect aspect and has been played positive effect, but because of the existence of " negative pressure " in insulated tubing annular space and steel " hydrogen oozes " phenomenon, insulated tubing is obviously decayed in go into the well steam injection oil recovery about 2 years or 15 all after date heat-proof qualities of steam injection, have a strong impact on the application life of insulated tubing, box cupling junction heat waste is serious simultaneously, cause that this place's well cementing casing pipe occurs that cover damages phenomenon, therefore cause the huge waste of economic benefit.
Summary of the invention
The object of this invention is to provide a kind of heat insulation tubing and casing and manufacture method thereof that can overcome above-mentioned defect, heat-proof quality temperature, excellent working performance.Its technical scheme is:
A kind of heat insulation tubing and casing, it is characterized in that: the outer tube, intervalve and the inner tube that comprise steel gap suit, wherein intervalve one end machining internal thread, other end threading, one end of intervalve machining internal thread and outer tube weld at pipe end place, weld at reserved internal thread length place with inner tube, one end of intervalve threading and outer tube, in the welding of reserved external thread length place, weld at pipe end place with inner tube; Filling with insulation material vacuumize and form the first isolation layer in the annular space that outer tube and intervalve form, vacuumizes rear inert gas injecting, formation the second isolation layer in the annular space of intervalve and inner tube.
A manufacture method for heat insulation tubing and casing, is characterized in that adopting following steps: the 1) pretreatment of outer tube, intervalve and inner tube; 2) inner tube and intervalve suit and welding; 3) inner tube and the processing of intervalve annular space; 4) outer tube and intervalve suit and welding; 5) outer tube and the processing of intervalve annular space; 6) apparent heat conductivity test; 7) intervalve two ends machining screw.
The manufacture method of described heat insulation tubing and casing, step 1) pretreatment of middle external tube, intervalve and inner tube comprises: intervalve is carried out to end upsetting, and orifice is taken out in processing on intervalve and outer tube, the inside and outside wall of the inwall with shot-blasting machine to outer tube, the outer wall of inner tube and intervalve carries out blasting treatment, finally by compound steel pipe within 3 hours, carrying out degassing processing except being heated to 380 DEG C of insulations in steam stove; Step 2) in inner tube and intervalve be set with and welding method is: inner tube is drawn to intervalve, and weld this end after the reserved internal thread machining length in intervalve one end, then by the other end of intervalve and inner tube in pipe end place welding, two ends weld seam carry out x-ray inspection by after carry out next step; Step 3) in the method for inner tube and the processing of intervalve annular space be: annular space is evacuated to 10
-1re-injection inert gas after Pa, then carries out the stifled weldering of electric resistance welding, use dye penetrant inspection detect by after carry out next step; Step 4) middle external tube and intervalve suit and welding method be: first at intervalve external surface wrapping heat-barrier material with add and inhale hydrogen agent, then the assembly of inner tube and intervalve is drawn to outer tube pipe, and adopt carbon dioxide gas arc welding to weld this end after the reserved external thread length in one end of inner tube and the reserved threading of intervalve assembly, and then other one end is welded together at pipe end place, to two ends weld seam carry out x-ray inspection by after carry out next step; Step 5) method of middle external tube and the processing of intervalve annular space is: outer tube and intervalve annular space are evacuated to 10
-2the Pa order of magnitude carries out electric resistance welding shutoff under vacuum state, use dye penetrant inspection detect by after carry out next step; Step 6) in apparent heat conductivity testing standard be: apparent heat conductivity is not more than 0.02w/m DEG C for qualified products, carries out next step; Step 7) be at intervalve two ends difference machining internal thread and external screw thread.
Compared with prior art, its advantage is in the present invention:
1) there is double thermal insulation layer, greatly promoted the heat-proof quality of product;
2) in the annular space of inner tube and intervalve, inert gas injecting has slowed down " hydrogen oozes " phenomenon, has extended the heat insulation life-span;
3) in junction be double-decker, thoroughly solve the heat waste problem at this place, its heat-proof quality is promoted to D～E level by current A～E level, junction heat waste 70% is reduced to 10% by what originally accounted for the total heat waste of tubing string, it is estimated that, the heat insulation life-span of the heat insulation tubing and casing of the present invention can extend to 8～10 years by current 2 years;
4) cover that has solved junction damages problem;
5) internal diameter is unified, and junction is without turbulent flow.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
In figure: 1, outer tube 2, intervalve 3, inner tube 4, the first isolation layer 5, the second isolation layer 6, take out orifice
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
In the embodiment shown in fig. 1: the outer tube 1, intervalve 2 and the inner tube 3 that comprise steel gap suit, wherein intervalve 2 one end machining internal threads, other end threading, one end of intervalve 2 machining internal threads and outer tube 1 weld at pipe end place, weld at reserved internal thread length place with inner tube 3, one end of intervalve 2 threadings and outer tube 1, in the welding of reserved external thread length place, weld at pipe end place with inner tube 3; Filling with insulation material vacuumize and form the first isolation layer 4 in the annular space that outer tube 1 and intervalve 2 form, vacuumizes rear inert gas injecting in the annular space of intervalve 2 and inner tube 3, forms the second isolation layer 5.
Its manufacture method adopts following steps: the 1) pretreatment of outer tube 1, intervalve 2 and inner tube 3; 2) inner tube 3 is set with and welds with intervalve 2; 3) inner tube 3 and intervalve 2 annular space processing; 4) outer tube 1 is set with and welds with intervalve 2; 5) outer tube 1 and intervalve 2 annular space processing; 6) apparent heat conductivity test; 7) intervalve 2 two ends machining screw.Wherein:
The pretreatment of outer tube 1, intervalve 2 and inner tube 3 comprises: intervalve 2 is carried out to end upsetting, and orifice 6 is taken out in processing on intervalve 2 and outer tube 1, the inside and outside wall of the inwall with shot-blasting machine to outer tube 1, the outer wall of inner tube 3 and intervalve 2 carries out blasting treatment, finally by compound steel pipe within 3 hours, carrying out degassing processing except being heated to 380 DEG C of insulations in steam stove; Inner tube 3 is set with intervalve 2 and welding method is: inner tube 3 is drawn to intervalve 2, and weld this end after the reserved internal thread machining length in intervalve 2 one end, then by the other end of intervalve 2 and inner tube 3 in pipe end place welding, two ends weld seam carry out x-ray inspection by after carry out next step; Inner tube 3 with the method for intervalve 2 annular space processing is: annular space is evacuated to 10
-1re-injection inert gas after Pa, then carries out the stifled weldering of electric resistance welding, use dye penetrant inspection detect by after carry out next step; Outer tube 1 is set with intervalve 2 and welding method is: first inhale hydrogen agent at intervalve 2 external surface wrapping heat-barrier materials and interpolation, then in the assembly of inner tube 3 and intervalve 2 being drawn and managing to outer tube 1, and after reserving external thread length, inner tube 3 and one end of the reserved threading of intervalve 2 assemblys adopt carbon dioxide gas arc welding to weld this end, and then other one end is welded together at pipe end place, to two ends weld seam carry out x-ray inspection by after carry out next step; Outer tube 1 with the method for intervalve 2 annular space processing is: outer tube 1 and intervalve 2 annular spaces are evacuated to 10
-2the Pa order of magnitude carries out electric resistance welding shutoff under vacuum state, use dye penetrant inspection detect by after carry out next step; Apparent heat conductivity testing standard is: apparent heat conductivity is not more than 0.02w/m DEG C for qualified products, carries out next step; Intervalve 2 two ends machining internal thread and external screw thread respectively.
Manufacture a collection of heat insulation tubing and casing by the inventive method, and tested for oil producing operation.Heat insulation tubing and casing (newly pipe) and the heat insulation tubing and casing (old pipe) of use after 2 years by SY/T5324-94 standard to firm manufacture are tested its heat-proof quality, the results are shown in Table 1.Visible, the heat-proof quality of the new pipe of the heat insulation tubing and casing of the present invention all, between D～E, is used apparent heat conductivity after 2 years to change not quite, and data accordingly, can calculate, the heat insulation life-span of the heat insulation tubing and casing of the present invention can reach 8～10 years.
The heat-proof quality of the heat insulation tubing and casing of table 1 the present invention
Claims (9)
1. a heat insulation tubing and casing, it is characterized in that: the outer tube (1), intervalve (2) and the inner tube (3) that comprise steel gap suit, wherein intervalve (2) one end machining internal thread, other end threading, one end of intervalve (2) machining internal thread and outer tube (1) weld at pipe end place, weld at reserved internal thread length place with inner tube (3), one end of intervalve (2) threading and outer tube (1), in the welding of reserved external thread length place, weld at pipe end place with inner tube (3); Filling with insulation material vacuumize and form the first isolation layer (4) in the annular space that outer tube (1) and intervalve (2) form, in the annular space of intervalve (2) and inner tube (3), vacuumize rear inert gas injecting, form the second isolation layer (5).
2. a manufacture method for heat insulation tubing and casing according to claim 1, is characterized in that adopting following steps: the 1) pretreatment of outer tube (1), intervalve (2) and inner tube (3); 2) inner tube (3) and intervalve (2) suit and welding; 3) inner tube (3) and intervalve (2) annular space processing; 4) outer tube (1) and intervalve (2) suit and welding; 5) outer tube (1) and intervalve (2) annular space processing; 6) apparent heat conductivity test; 7) intervalve (2) two ends machining screw.
3. the manufacture method of heat insulation tubing and casing according to claim 2, it is characterized in that step 1) pretreatment of outer tube (1), intervalve (2) and inner tube (3) comprising: intervalve (2) is carried out to end upsetting, and take out orifice (6) at intervalve (2) and the upper processing of outer tube (1), the inside and outside wall of the inwall with shot-blasting machine to outer tube (1), the outer wall of inner tube (3) and intervalve (2) carries out blasting treatment, finally by compound steel pipe within 3 hours, carrying out degassing processing except being heated to 380 DEG C of insulations in steam stove.
4. the manufacture method of heat insulation tubing and casing according to claim 2, it is characterized in that step 2) inner tube (3) is set with intervalve (2) and welding method is: inner tube (3) is drawn to intervalve (2), and weld this end after the reserved internal thread machining length in intervalve (2) one end, then by the other end of intervalve (2) and inner tube (3) in pipe end place welding, two ends weld seam carry out x-ray inspection by after carry out next step.
5. the manufacture method of heat insulation tubing and casing according to claim 2, is characterized in that step 3) method of inner tube (3) and intervalve (2) annular space processing is: annular space is evacuated to 10
-1re-injection inert gas after Pa, then carries out the stifled weldering of electric resistance welding, use dye penetrant inspection detect by after carry out next step.
6. the manufacture method of heat insulation tubing and casing according to claim 2, it is characterized in that step 4) outer tube (1) is set with intervalve (2) and welding method is: first inhale hydrogen agent at intervalve (2) external surface wrapping heat-barrier material and interpolation, then the assembly of inner tube (3) and intervalve (2) is drawn to outer tube (1) pipe, and after reserving external thread length, inner tube (3) and one end of the reserved threading of intervalve (2) assembly adopt carbon dioxide gas arc welding to weld this end, and then other one end is welded together at pipe end place, to two ends weld seam carry out x-ray inspection by after carry out next step.
7. the manufacture method of heat insulation tubing and casing according to claim 2, is characterized in that step 5) method of outer tube (1) and intervalve (2) annular space processing is: outer tube (1) and intervalve (2) annular space are evacuated to 10
-2the Pa order of magnitude carries out electric resistance welding shutoff under vacuum state, use dye penetrant inspection detect by after carry out next step.
8. the manufacture method of heat insulation tubing and casing according to claim 2, is characterized in that step 6) apparent heat conductivity testing standard is: apparent heat conductivity is not more than 0.02w/m DEG C for qualified products, carries out next step.
9. the manufacture method of heat insulation tubing and casing according to claim 2, is characterized in that step 7) be intervalve (2) two ends machining internal thread and external screw thread respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053038.5A CN103850653B (en) | 2014-02-17 | 2014-02-17 | The manufacture method of insulation oil sleeve pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053038.5A CN103850653B (en) | 2014-02-17 | 2014-02-17 | The manufacture method of insulation oil sleeve pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103850653A true CN103850653A (en) | 2014-06-11 |
| CN103850653B CN103850653B (en) | 2016-04-20 |
Family
ID=50858747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410053038.5A Active CN103850653B (en) | 2014-02-17 | 2014-02-17 | The manufacture method of insulation oil sleeve pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103850653B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104589000A (en) * | 2015-02-15 | 2015-05-06 | 四川蓝星机械有限公司 | Processing technology of double-layered sleeve |
| CN105275406A (en) * | 2014-06-19 | 2016-01-27 | 中国石油化工股份有限公司 | Heat insulation well completion device and method |
| CN107833728A (en) * | 2017-10-31 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | Sealing structure and encapsulating method of the transformer oil filled bushing insulator with metab |
| CN110227909A (en) * | 2019-06-17 | 2019-09-13 | 中国航发南方工业有限公司 | Open type double-layer heat insulation tank body of oil tank processing method |
| CN110449697A (en) * | 2019-08-06 | 2019-11-15 | 张家港市江南锅炉压力容器有限公司 | Interior pipe heating device for linear quencher and the inner tube welding method using it |
| CN111287672A (en) * | 2020-04-16 | 2020-06-16 | 东北石油大学 | Heat exchange and heat insulation sleeve for exploiting terrestrial heat by utilizing waste oil well |
| CN115263201A (en) * | 2022-08-03 | 2022-11-01 | 山东美生热能科技有限公司 | Heat insulation oil sleeve with vacuum self-checking function |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4415184A (en) * | 1981-04-27 | 1983-11-15 | General Electric Company | High temperature insulated casing |
| US6000438A (en) * | 1998-02-13 | 1999-12-14 | Mcdermott Technology, Inc. | Phase change insulation for subsea flowlines |
| CN2410410Y (en) * | 2000-03-20 | 2000-12-13 | 孟范中 | High efficient injection-production dual-purpose energy-saving oil pipe for thickened oil |
| CN2544086Y (en) * | 2002-06-14 | 2003-04-09 | 孟范中 | Thermal-insulation oil production pipe for thick oil |
| CN201090202Y (en) * | 2007-09-24 | 2008-07-23 | 辽河石油勘探局 | Heat insulation pipe without coupling |
| RU2375547C1 (en) * | 2008-06-09 | 2009-12-10 | Вадим Викторович Емельянов | Thermally insulated column |
| CN101644372A (en) * | 2009-08-21 | 2010-02-10 | 湖北贵族真空科技股份有限公司 | Vacuum compound heat insulating pipe |
| CN102071879A (en) * | 2011-01-07 | 2011-05-25 | 辽河石油勘探局总机械厂 | Novel prestressed heat-insulation oil pipe |
-
2014
- 2014-02-17 CN CN201410053038.5A patent/CN103850653B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4415184A (en) * | 1981-04-27 | 1983-11-15 | General Electric Company | High temperature insulated casing |
| US6000438A (en) * | 1998-02-13 | 1999-12-14 | Mcdermott Technology, Inc. | Phase change insulation for subsea flowlines |
| CN2410410Y (en) * | 2000-03-20 | 2000-12-13 | 孟范中 | High efficient injection-production dual-purpose energy-saving oil pipe for thickened oil |
| CN2544086Y (en) * | 2002-06-14 | 2003-04-09 | 孟范中 | Thermal-insulation oil production pipe for thick oil |
| CN201090202Y (en) * | 2007-09-24 | 2008-07-23 | 辽河石油勘探局 | Heat insulation pipe without coupling |
| RU2375547C1 (en) * | 2008-06-09 | 2009-12-10 | Вадим Викторович Емельянов | Thermally insulated column |
| CN101644372A (en) * | 2009-08-21 | 2010-02-10 | 湖北贵族真空科技股份有限公司 | Vacuum compound heat insulating pipe |
| CN102071879A (en) * | 2011-01-07 | 2011-05-25 | 辽河石油勘探局总机械厂 | Novel prestressed heat-insulation oil pipe |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275406A (en) * | 2014-06-19 | 2016-01-27 | 中国石油化工股份有限公司 | Heat insulation well completion device and method |
| CN105275406B (en) * | 2014-06-19 | 2017-12-26 | 中国石油化工股份有限公司 | Heat-insulated completion system and heat-insulated completion method |
| CN104589000A (en) * | 2015-02-15 | 2015-05-06 | 四川蓝星机械有限公司 | Processing technology of double-layered sleeve |
| CN107833728A (en) * | 2017-10-31 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | Sealing structure and encapsulating method of the transformer oil filled bushing insulator with metab |
| CN110227909A (en) * | 2019-06-17 | 2019-09-13 | 中国航发南方工业有限公司 | Open type double-layer heat insulation tank body of oil tank processing method |
| CN110449697A (en) * | 2019-08-06 | 2019-11-15 | 张家港市江南锅炉压力容器有限公司 | Interior pipe heating device for linear quencher and the inner tube welding method using it |
| CN111287672A (en) * | 2020-04-16 | 2020-06-16 | 东北石油大学 | Heat exchange and heat insulation sleeve for exploiting terrestrial heat by utilizing waste oil well |
| CN115263201A (en) * | 2022-08-03 | 2022-11-01 | 山东美生热能科技有限公司 | Heat insulation oil sleeve with vacuum self-checking function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103850653B (en) | 2016-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103850653B (en) | The manufacture method of insulation oil sleeve pipe | |
| CN101644372B (en) | Vacuum compound heat insulating pipe | |
| CN205135442U (en) | Interior heat preservation high vacuum insulation oil pipe that scribbles | |
| CN203161103U (en) | Prestressed vacuum heat-insulating sleeve | |
| CN103883263A (en) | Aerogel composite heat insulation sleeve | |
| CN103850654B (en) | The manufacture method of the heat insulation tubing and casing of prestressing force | |
| CN101664846B (en) | Method for preparing test real object for G3 alloy oil well pipe by welding | |
| CN105201416A (en) | Titanium alloy heat-insulation oil pipe and producing method thereof | |
| CN203978312U (en) | Heat insulation box cupling | |
| CN205243430U (en) | Aerogel heat insulation oil pipe | |
| CN104284460A (en) | High-temperature drying-free U-shaped pipe and manufacturing method thereof | |
| CN204040920U (en) | Aeroge compound heat-insulation sleeve pipe | |
| CN203742574U (en) | Heat insulation oil casing well completion pipe string | |
| CN103867162A (en) | Thermal production well annulus thermal insulation system and method | |
| CN101187292B (en) | Supercritical heat-insulated oil pipe production method | |
| CN102102492A (en) | Straight-joint type insulated tubing and processing technology thereof | |
| CN104847281A (en) | Direct connection type vacuum thermal-insulating oil pipe | |
| CN200958368Y (en) | Vacuum thermal-insulating double pipe of oil well | |
| CN203742573U (en) | Thermal insulation oil casing pipe | |
| CN110181228B (en) | Manufacturing process of bimetal mechanical composite bent pipe | |
| CN202252632U (en) | Composite transfer pipe with internally-arranged multilayer vacuum heat-insulation pipe | |
| CN204476300U (en) | A kind of insulated tubing of filling high pressure argon gas | |
| CN208089238U (en) | A kind of vacuum heat insulation tube | |
| CN202560114U (en) | Efficient prestress thermal insulation pipe | |
| CN106869811A (en) | A kind of new direct-connected insulated tubing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | 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: 20200113 Address after: 255000 west head of Weisi Road, Qilu Chemical Industry Zone, Linzi District, Zibo City, Shandong Province Patentee after: Zibo Fu ruit heat energy technology Co., Ltd. Address before: 257082 No. 203, South Road, Dongying District, Shandong, Dongying Patentee before: Shengli Oil Field Furuite Petroleum Equipment Co., Ltd. |
|
| TR01 | Transfer of patent right |