CN1177699A - Vacuum heat-insulation oil pipe and manufacturing technology therefor - Google Patents
Vacuum heat-insulation oil pipe and manufacturing technology therefor Download PDFInfo
- Publication number
- CN1177699A CN1177699A CN 97115719 CN97115719A CN1177699A CN 1177699 A CN1177699 A CN 1177699A CN 97115719 CN97115719 CN 97115719 CN 97115719 A CN97115719 A CN 97115719A CN 1177699 A CN1177699 A CN 1177699A
- Authority
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- Prior art keywords
- pipe
- outer tube
- heat
- interior pipe
- bushing
- 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
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- 238000009413 insulation Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005516 engineering process Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims description 7
- 239000005030 aluminium foil Substances 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 238000005242 forging Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000010327 methods by industry Methods 0.000 claims description 2
- 238000004080 punching Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000010025 steaming Methods 0.000 abstract 2
- 238000005086 pumping Methods 0.000 abstract 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 150000001398 aluminium Chemical class 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Landscapes
- Thermal Insulation (AREA)
Abstract
The present invention relates to a vacuum heat-insulated tubing for steaming production of heavy crude well and its manufacturing process. Said heat-insulated tubing comprises sealing ring, heat-insulating sleeve, liner, collar, outer tube, inner tube, heat-insulting material, centralizing block and getter. Its manufacture process includes the following steps: inner tube processing treatment, assembling inner and outer tubes, vacuum-pumping, plugging-welding and installing fittings and a series of implement techniques to can obtain the invented vacuum heat-insulated tubing with low apparent thermal conductivity factor, good heat-insulating effect and high thermal efficiency. Said invention not only can be used for conveying high-temp. high-pressure steam in the steaming production of heavy crude, but also can be extensively used in various pipelines having need of heat insulation or retaining temperature.
Description
The present invention relates to a kind of vacuum heat-insulation oil pipe and manufacturing process technology thereof that is used for the thick oil well exploitation via steam injection.
Vacuum heat-insulation oil pipe is the visual plant that thick oil well exploitation via steam injection process adopts; its purposes is to inject high temperature (350 ℃), high pressure (17MPa) steam toward the down-hole as annotating the vapour passage; and protect oil well casing and cementing concrete ring to avoid thermal stress damage; reduce the pit shaft thermodynamic loss, improve and annotate vapour oil recovery effect.Existing insulated tubing insulation system is aided with aluminium foil, glass cloth etc. usually based on thermal-protective materials such as glass wool, aluminium silicate wools, and charges into the inert gas of low thermal conductivity after vacuumizing.The shortcoming of this kind insulated tubing is that the body apparent heat conductivity is higher, and heat-shielding performance is not ideal enough.Vacuum multilayer insulation technology in department's extensive uses such as cryogenic engineering and space technologies, then owing to insulated tubing in the petroleum thermal recovery process is worked under High Temperature High Pressure, itself is not only thin but also long, obtain and keep vacuum very the difficulty, it is very big to make difficulty of processing, thereby fails for a long time to be applied on insulated tubing.
The object of the present invention is to provide a kind of vacuum heat-insulation oil pipe and manufacturing process technology thereof, utilize that this kind process engineering can make that a kind of apparent heat conductivity is low, good heat-insulation effect, insulated tubing that the thermal efficiency is high.
Technological scheme of the present invention is as follows.Vacuum heat-insulation oil pipe provided by the invention is made up of box cupling, insulation bushing, bushing pipe, outer tube, interior pipe, thermal-protective material, righting block, getter, wherein: the box cupling lower end is connected with outer tube by screw thread, seal ring is housed in the box cupling, place the interior pipe top in the outer tube that bushing pipe is housed, bushing pipe is set with insulation bushing outward; The interior pipe that is toroidal is welded as a whole with outer tube respectively at two ends up and down, is provided with thermal-protective material between the inner and outer pipes, and is placed with getter, and interior pipe outer total length is evenly equipped with 4 pairs of support righting blocks.Vacuum heat-insulation oil pipe manufacturing process technology provided by the invention is as follows:
1. pipe adopts external upset tubing in the interior pipe processing, and toroidal is expanded into horizontal forging machine after adopting heating in medium frequency in two ends, and the horn mouth size is identical with outer tube diameter; Inner tube outer surface is carried out shot blast; Industrial aluminium foil with tape punching wraps in interior tube outside, and dispenser getter on it wraps the 2-15 layer altogether, and every two-layer middle with glass fibre screen window cloth that toasted or glass cloth interval, the formation thermal-protective material has wrapped the back along 4 pairs of righting blocks of interior pipe total length uniform device; The interior pipe assembly of wrapping thermal-protective material sent in the stove toast;
2. the interior pipe assembly after the inner and outer pipe assembling will be toasted is packed internal surface in the outer tube of shot blast; Use CO
2Electrogas process weld-ring weld seam welds inner and outer pipes one end earlier; Then, apply prestressing force for interior pipe with the thermal stretching method; When pipe is elongated to designing requirement (350 ℃ of temperature, prestressing force 240MPa) in treating, use with the quadrat method weldering the other end;
3. vacuumize after the evacuation holes of aiming at outer tube one end loads onto special finding time for the insulated tubing that is assembled into one to seal jig, begin to vacuumize; When vacuumizing, on custom-designed roasting plant, insulated tubing is toasted, the limit baking, find time in the limit, and roasting temperature is on operating temperature;
Shutoff welding when degree of vacuum reach design standard (＜15Pa) after, adopt electric resistance welding method under the situation of finding time, evacuation holes to be carried out shutoff and weld;
5. installation accessories is with connecting thread on the outer tube upper/lower terminal car; Then, load onto the box cupling of band seal ring by screw thread, should be on screw thread before the dress brushing seal gease; The bushing pipe that the outside is set with insulation bushing places interior pipe top.
The needs of the vacuum heat-insulation oil pipe proper functioning that the heat-insulating technique that the present invention adopts laminated aluminium foil to vacuumize guaranteed 9m only several millimeters to tens millimeters in monolateral gap how long and between inside and outside two pipes, work under High Temperature High Pressure.Adopt the method for heating in medium frequency adapted horizontal forging machine, solved the difficult problem of pipe termination bell mouth expanding how long at 9m.Adopt the internal pipe of thermal stretching method to apply the temperature difference elongation that prestressing force can compensate inner and outer pipes.Make in the course of working, material therefor all toasts drying process, and shot blast is all carried out in the metal surface, and puts into getter in annular space, can make the vacuum heat-insulation system remain intact state, avoids all gases and pollutes.Insulated tubing two ends circumferential weld adopts CO
2Gas shielded arc welding, but both proof strengths can guarantee sealing again.When the shutoff evacuation holes, adopt the resistance welding plugging technology, and use special-purpose sealing jig, thereby can when vacuumizing, weld plug-hole, thereby can guarantee to seal the degree of vacuum of annular space.
Vacuum heat-insulation oil pipe apparent heat conductivity provided by the invention is low, good heat-insulation effect, thermal efficiency height utilizes it to be used to carry high temperature and high pressure steam in exploitation via steam injection viscous crude process, and can be at needs extensive use in the various pipelines of heat insulation or insulation.Manufacturing process technology little investment provided by the invention, easy and simple to handle, can guarantee the insulated tubing quality, improve effect of heat insulation.
Accompanying drawing is the structural representation of vacuum heat-insulation oil pipe of the present invention.
Below in conjunction with accompanying drawing enforcement of the present invention is illustrated.
As shown in the figure, this vacuum insulated tubing body is made up of two concentric tubes (being outer tube and interior pipe), and every insulated tubing length is 9-10m.Wherein, outer tube 5, interior pipe 8 are the OCTG of standard, and outer tube 5 upper/lower terminals are respectively equipped with trapezoidal external screw thread, and interior pipe 8 upper and lower two upset ends expand into toroidal, and outer end diameter and outer tube diameter match.It is that the industrial aluminium foil of perforation of 0.01-0.05mm (being) and thickness are that 0.05-0.7mm (being), the porosity ratio of interval insulant area (pore area with) are that glass fibre screen window cloth or the glass cloth of 0.6-0.8 constitutes at interval with 0.2mm with 0.03mm that thermal-protective material 6 adopts 2-15 layer (being generally 6 layers) thickness.Getter 9 adopts JH105 non-evaporation type low temp activated degasser or other similar getter materials.
Claims (2)
1. vacuum heat-insulation oil pipe, by seal ring (1), insulation bushing (2), bushing pipe (3), box cupling (4), outer tube (5), thermal-protective material (6), righting block (7), interior pipe (8), getter (9) is formed, it is characterized in that: box cupling (4) lower end is connected with outer tube (5) by screw thread, be provided with seal ring (1) in the box cupling, place interior pipe (8) top in the outer tube (5) that bushing pipe (3) is housed, bushing pipe is set with insulation bushing (2) outward, the interior pipe (8) that is toroidal is welded as a whole with outer tube (5) respectively at two ends up and down, be provided with thermal-protective material (6) between the inner and outer pipes, and being placed with getter (9), interior pipe (8) outer total length is evenly equipped with 4 pairs of righting blocks (7).
2. vacuum heat-insulation oil pipe manufacturing process technology, it is characterized in that: this process engineering follows these steps to, requires carry out:
A. the pipe processing adopts external upset tubing in, and the size toroidal identical with outer tube diameter expanded into horizontal forging machine after adopting heating in medium frequency in two ends; Inner tube outer surface is carried out shot blast; Industrial aluminium foil with tape punching wraps in interior tube outside, and dispenser has getter on it, wraps the 2-15 layer altogether, and every two-layer middle with glass fibre screen window cloth that toasted or glass cloth interval, the formation thermal-protective material has wrapped the back along 4 pairs of righting blocks of interior pipe total length uniform device; The interior pipe assembly of wrapping thermal-protective material sent in the stove toast;
B. the interior pipe assembly after the inner and outer pipe assembling will be toasted is packed internal surface in the outer tube of shot blast; Use CO
2Electrogas process weld-ring weld seam welds inner and outer pipes one end earlier; Then, apply prestressing force for interior pipe with the thermal stretching method; When pipe is elongated to designing requirement in treating, use with the quadrat method weldering the other end;
C. vacuumize after the evacuation holes of aiming at outer tube one end loads onto special finding time for the insulated tubing that is assembled into one to seal jig, begin to vacuumize; When vacuumizing, on custom-designed roasting plant, insulated tubing is toasted, find time while toasting, keep roasting temperature on operating temperature;
D. the shutoff welding adopts electric resistance welding method under the situation of finding time evacuation holes to be carried out the shutoff welding after degree of vacuum reaches design standard;
E. installation accessories is with connecting thread on the two ends car about the outer tube; Then, load onto the box cupling of band seal ring by screw thread, should be on screw thread before the dress brushing seal gease; The bushing pipe that the outside is set with insulation bushing places interior pipe top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115719A CN1061750C (en) | 1997-08-13 | 1997-08-13 | Vacuum heat-insulation oil pipe and manufacturing technology therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115719A CN1061750C (en) | 1997-08-13 | 1997-08-13 | Vacuum heat-insulation oil pipe and manufacturing technology therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1177699A true CN1177699A (en) | 1998-04-01 |
| CN1061750C CN1061750C (en) | 2001-02-07 |
Family
ID=5173397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97115719A Expired - Lifetime CN1061750C (en) | 1997-08-13 | 1997-08-13 | Vacuum heat-insulation oil pipe and manufacturing technology therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1061750C (en) |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832108A (en) * | 2010-05-07 | 2010-09-15 | 湖北贵族真空科技股份有限公司 | Vacuum oil tubing coupling |
| 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 |
| CN102392607A (en) * | 2011-07-22 | 2012-03-28 | 宝鸡石油钢管有限责任公司 | Continuous heat insulating oil pipe and manufacturing method thereof |
| CN102536164A (en) * | 2010-12-21 | 2012-07-04 | 熊斌辉 | Ultrahigh-temperature well completion technology |
| CN102562016A (en) * | 2012-01-31 | 2012-07-11 | 中国石油天然气股份有限公司 | Heavy oil thermal recovery process method |
| CN102679063A (en) * | 2012-05-17 | 2012-09-19 | 上海交通大学 | High-performance electrical isolation flange device resisting high temperature and high pressure |
| CN101289925B (en) * | 2007-04-18 | 2012-10-17 | 扬州龙川钢管有限公司 | Heat insulated tubing machining process |
| CN102852758A (en) * | 2012-08-24 | 2013-01-02 | 北京天海工业有限公司 | Full-vacuum pump pool |
| CN102900913A (en) * | 2012-10-18 | 2013-01-30 | 山东鸿盛石油化工装备有限公司 | High-vacuum thermal sleeve |
| CN102927378A (en) * | 2012-11-26 | 2013-02-13 | 中国平煤神马集团阳光物业有限公司 | Vacuum vertical burying heating pipe |
| CN104019329A (en) * | 2014-06-25 | 2014-09-03 | 山东鸿盛石油化工装备有限公司 | Overhead high-vacuum prestressed steam conveying pipeline |
| CN104047549A (en) * | 2014-06-25 | 2014-09-17 | 山东鸿盛石油化工装备有限公司 | High-abrasion-resistant corrosion-resistant insulation oil tube |
| CN104565576A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Pipeline and pipeline with coupling |
| CN104612628A (en) * | 2015-02-02 | 2015-05-13 | 中国海洋石油总公司 | Method for prolonging service life of vacuum insulated oil tube by filling high-pressure argon |
| CN104712298A (en) * | 2015-03-23 | 2015-06-17 | 朱长林 | Vacuum heating oil pipe |
| CN105201416A (en) * | 2015-09-08 | 2015-12-30 | 宝鸡石油钢管有限责任公司 | Titanium alloy heat-insulation oil pipe and producing method thereof |
| CN106195531A (en) * | 2016-08-31 | 2016-12-07 | 宁波万里管道有限公司 | Vacuum heat-preserving tube |
| CN108851244A (en) * | 2018-07-24 | 2018-11-23 | 深圳麦克韦尔股份有限公司 | Toast the heating component of smoking set and vacuum heat-insulation |
| CN109424325A (en) * | 2017-08-22 | 2019-03-05 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | A kind of flow string and oil extraction system |
| CN109986303A (en) * | 2018-01-02 | 2019-07-09 | 中国石油化工股份有限公司 | The manufacturing method of aerogel heat-proof oil pipe |
| CN114135742A (en) * | 2021-12-13 | 2022-03-04 | 中海石油(中国)有限公司 | Heat insulation structure and heat insulation method of double-layer heat insulation pipeline |
| CN114293925A (en) * | 2021-12-30 | 2022-04-08 | 中海石油(中国)有限公司深圳分公司 | Ultra-large-diameter heat-insulating sleeve for offshore oil exploitation and production process thereof |
| CN115559671A (en) * | 2022-11-04 | 2023-01-03 | 山东美生热能科技有限公司 | Super 13Cr anticorrosive heat-insulating oil casing assembly |
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| CA854056A (en) * | 1967-11-21 | 1970-10-20 | Becker Drilling (Alberta) Ltd. | Joint for double-walled drill pipe |
| FR2398253A1 (en) * | 1977-07-19 | 1979-02-16 | Sofitec | INSULATED AND BURIED METAL DUCT FOR THE TRANSPORT OF HOT FLUIDS |
| EP0138603A3 (en) * | 1983-10-13 | 1986-04-23 | Texas Forge & Tool Limited | Improvements in or relating to rods and pipes |
| US4694634A (en) * | 1985-09-16 | 1987-09-22 | The Babcock & Wilcox Company | Vacuum sealing device for insulated steam injection tubing |
| ES2036394T3 (en) * | 1989-12-07 | 1993-05-16 | V.W. Werke Vincenz Wiederholt Gmbh & Co Kg | DOUBLE PIPE, ESPECIALLY FOR EXHAUST GAS FACILITIES EQUIPPED WITH A CATALYST FOR INTERNAL COMBUSTION ENGINES, AND PROCEDURE FOR THE MANUFACTURE OF SUCH DOUBLE PIPE. |
| DE4107539C2 (en) * | 1991-03-08 | 1996-11-28 | Audi Ag | Insulated pipe |
| AT404386B (en) * | 1994-05-25 | 1998-11-25 | Johann Dipl Ing Springer | DOUBLE-WALLED THERMALLY INSULATED TUBING STRAND |
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1997
- 1997-08-13 CN CN97115719A patent/CN1061750C/en not_active Expired - Lifetime
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289925B (en) * | 2007-04-18 | 2012-10-17 | 扬州龙川钢管有限公司 | Heat insulated tubing machining process |
| CN101832108B (en) * | 2010-05-07 | 2013-02-27 | 湖北贵族真空科技股份有限公司 | Vacuum oil tubing coupling |
| CN101832108A (en) * | 2010-05-07 | 2010-09-15 | 湖北贵族真空科技股份有限公司 | Vacuum oil tubing coupling |
| CN102536164A (en) * | 2010-12-21 | 2012-07-04 | 熊斌辉 | Ultrahigh-temperature well completion technology |
| 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 |
| CN102392607A (en) * | 2011-07-22 | 2012-03-28 | 宝鸡石油钢管有限责任公司 | Continuous heat insulating oil pipe and manufacturing method thereof |
| CN102392607B (en) * | 2011-07-22 | 2014-12-03 | 宝鸡石油钢管有限责任公司 | Continuous heat insulating oil pipe and manufacturing method thereof |
| CN102562016A (en) * | 2012-01-31 | 2012-07-11 | 中国石油天然气股份有限公司 | Heavy oil thermal recovery process method |
| CN102679063A (en) * | 2012-05-17 | 2012-09-19 | 上海交通大学 | High-performance electrical isolation flange device resisting high temperature and high pressure |
| CN102679063B (en) * | 2012-05-17 | 2014-12-10 | 上海交通大学 | High-performance electrical isolation flange device resisting high temperature and high pressure |
| CN102852758A (en) * | 2012-08-24 | 2013-01-02 | 北京天海工业有限公司 | Full-vacuum pump pool |
| CN102852758B (en) * | 2012-08-24 | 2015-05-20 | 北京天海工业有限公司 | Full-vacuum pump pool |
| CN102900913A (en) * | 2012-10-18 | 2013-01-30 | 山东鸿盛石油化工装备有限公司 | High-vacuum thermal sleeve |
| CN102927378A (en) * | 2012-11-26 | 2013-02-13 | 中国平煤神马集团阳光物业有限公司 | Vacuum vertical burying heating pipe |
| CN104565576A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Pipeline and pipeline with coupling |
| CN104019329A (en) * | 2014-06-25 | 2014-09-03 | 山东鸿盛石油化工装备有限公司 | Overhead high-vacuum prestressed steam conveying pipeline |
| CN104047549A (en) * | 2014-06-25 | 2014-09-17 | 山东鸿盛石油化工装备有限公司 | High-abrasion-resistant corrosion-resistant insulation oil tube |
| CN104612628A (en) * | 2015-02-02 | 2015-05-13 | 中国海洋石油总公司 | Method for prolonging service life of vacuum insulated oil tube by filling high-pressure argon |
| CN104712298A (en) * | 2015-03-23 | 2015-06-17 | 朱长林 | Vacuum heating oil pipe |
| CN105201416A (en) * | 2015-09-08 | 2015-12-30 | 宝鸡石油钢管有限责任公司 | Titanium alloy heat-insulation oil pipe and producing method thereof |
| CN106195531A (en) * | 2016-08-31 | 2016-12-07 | 宁波万里管道有限公司 | Vacuum heat-preserving tube |
| CN109424325A (en) * | 2017-08-22 | 2019-03-05 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | A kind of flow string and oil extraction system |
| CN109424325B (en) * | 2017-08-22 | 2021-09-17 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | Oil production pipe and oil production system |
| CN109986303A (en) * | 2018-01-02 | 2019-07-09 | 中国石油化工股份有限公司 | The manufacturing method of aerogel heat-proof oil pipe |
| CN108851244A (en) * | 2018-07-24 | 2018-11-23 | 深圳麦克韦尔股份有限公司 | Toast the heating component of smoking set and vacuum heat-insulation |
| CN114135742A (en) * | 2021-12-13 | 2022-03-04 | 中海石油(中国)有限公司 | Heat insulation structure and heat insulation method of double-layer heat insulation pipeline |
| CN114293925A (en) * | 2021-12-30 | 2022-04-08 | 中海石油(中国)有限公司深圳分公司 | Ultra-large-diameter heat-insulating sleeve for offshore oil exploitation and production process thereof |
| CN115559671A (en) * | 2022-11-04 | 2023-01-03 | 山东美生热能科技有限公司 | Super 13Cr anticorrosive heat-insulating oil casing assembly |
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| CN1061750C (en) | 2001-02-07 |
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Owner name: CNPC BOHAI EQUIPMENT MANUFACTURING CO., LTD. Free format text: FORMER OWNER: MECHANICAL REPAIR AND MFG. GROUP CO., LIAOHE PETROLEUM EXPLORATION BURCAU Effective date: 20130407 |
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Effective date of registration: 20130407 Address after: 300457 Binhai New Area, Tianjin Binhai Service Outsourcing Industrial Park, building 3 Patentee after: CNPC Bohai Equipment Manufacturing Co., Ltd. Address before: Red Village Dawa County 124209 Liaoning city of Panjin Province Patentee before: Mechanical Repair and Mfg. Group Co., Liaohe Petroleum Exploration Burcau |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 19980401 Assignee: China Petroleum Group Bohai Petroleum Equipment Manufacturing Co., Ltd. Liaohe thermal extraction machinery manufacturing branch Assignor: CNPC Bohai Equipment Manufacturing Co., Ltd. Contract record no.: 2013990000342 Denomination of invention: Vacuum heat-insulation oil pipe and manufacturing technology therefor Granted publication date: 20010207 License type: Exclusive License Record date: 20130624 |
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Granted publication date: 20010207 |
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