CN101615215B - Design method for simplifying fatigue for semi-submersible type platform structure - Google Patents
Design method for simplifying fatigue for semi-submersible type platform structure Download PDFInfo
- Publication number
- CN101615215B CN101615215B CN2009100903318A CN200910090331A CN101615215B CN 101615215 B CN101615215 B CN 101615215B CN 2009100903318 A CN2009100903318 A CN 2009100903318A CN 200910090331 A CN200910090331 A CN 200910090331A CN 101615215 B CN101615215 B CN 101615215B
- Authority
- CN
- China
- Prior art keywords
- stress
- semi
- platform
- fatigue
- submersible type
- 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
Images
Abstract
The invention relates to a design method for simplifying fatigue for a semi-submersible type platform structure, comprising the following steps: (1) a semi-submersible type platform wave loading long-term forecast is carried out; (2) semi-submersible type platform structure stress long-term Weibull distribution shape parameter is determined; (3) the return-period maximum permissible stress range curve of the semi-submersible type platform structure life period is determined; (4) the return-period hotspot stress range of the semi-submersible type platform structure life period is calculated; (5) the fatigue life of the semi-submersible type platform structure is estimated. Compared with the existing fatigue design method of the platform structure, the design method for simplifying fatigue for semi-submersible type platform structure provided by the invention has the advantages of small workload and accurate calculation result, and can be used in the structure fatigue design of the semi-submersible type platform in the South China Sea.
Description
Technical field
The present invention relates to a kind of offshore engineering structure Fatigue Design method, particularly about a kind of design method for simplifying fatigue for semi-submersible type platform structure that adapts to the South China Sea environmental baseline.
Background technology
At present, semisubmersible platform generally adopts high strength and ultra-high strength steel to build, and it has, and version is simple, operating water depth big, adapt to characteristics such as abominable operating environment and changing load are big, in oceanographic engineering, is used widely.During semisubmersible platform operation at sea, owing to receive wave action, the seaway load that constantly changes makes platform inside produce the pulsating stress that constantly changes, and the fatigue damage that is caused by these pulsating stresses is a kind of main failure mode of platform.
The semi-submersible type platform structure analysis of fatigue is a ten minutes complex engineering practical problems; Simplifying fatigue analysis method is the LONG-TERM DISTRIBUTION Follow Weibull Distribution (Weibull distribution) of supposition fatigue stress; Its form parameter obtains by the match as a result of approximate formula, analysis of spectrum; The structural stress response adopts the finite element analysis technology to obtain, and this method has the details that can reflect platform structure, the advantage that amount of calculation is less relatively.Owing to lack the LONG-TERM DISTRIBUTION Weibull distribution shape parameter data of semisubmersible platform structural stress under the South China Sea environmental baseline; And the maximum focus range of stress dyscalculia of semisubmersible platform lifetime one chance, cause simplifying fatigue analysis method and in the semi-submersible type platform structure Fatigue Design, use seldom.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide a kind of design method for simplifying fatigue for semi-submersible type platform structure that adapts to the South China Sea environmental baseline, simply accurately computation structure fatigue lifetime, alleviate structural fatigue analytical work amount greatly.
For realizing above-mentioned purpose, the present invention takes following technical scheme: a kind of design method for simplifying fatigue for semi-submersible type platform structure, and it may further comprise the steps: 1) carry out the Long-term forecasting of semisubmersible platform seaway load; 2) confirm the long-term Weibull distribution shape of semi-submersible type platform structure stress parameter; 3) confirm semi-submersible type platform structure lifetime one chance maximum permissible stress scope curve; 4) calculate semi-submersible type platform structure lifetime one and meet the focus range of stress; 5) assessment semi-submersible type platform structure fatigue lifetime.
In execution in step 1) time; It comprises following content: calculate said semisubmersible platform seaway load according to the long-term sea data in said semisubmersible platform operation marine site; Said semisubmersible platform lifetime one is met seaway load carry out Long-term forecasting; Obtain said semisubmersible platform lifetime one and meet highest wave load, it comprises horizontal wave tear edge, horizontal wave torsional moment, vertical wave shearing force, vertical wave bending moment, vertical deck mass inertial force and horizontal deck mass inertial force.
In execution in step 2) time, it may further comprise the steps: 1. set up the one-piece construction finite element model of said semisubmersible platform, carry out the one-piece construction finite element analysis of different waves said semisubmersible platform under, different wave frequencies condition; 2. calculate each wave to said semisubmersible platform different structure position stress response transport function; Carry out the structural stress analysis of spectrum in conjunction with the long-term sea data in said semisubmersible platform operation marine site, obtain the average of said semisubmersible platform different parts structural stress long-term Weibull distribution shape parameter and stress response and spend null cycle.
In execution in step 3) time; It comprises following content: it's null cycle pasts requirement and the long-term stress response of structure average that met or exceeded based on ABS SN curve, structure fatigue life 30 years derives said semi-submersible type platform structure lifetime one and meets maximum permissible stress scope curve, comprises that being immersed in the seawater under the corrosion protection condition structural life-time phase one meets structural life-time phase one chance maximum permissible stress scope curve in maximum permissible stress scope curve and the air.
In execution in step 4) time; It comprises following content: according to said semisubmersible platform specific constructive form; Select corresponding structure lifetime one to meet the characteristic wave wave load; Carry out the one-piece construction finite element analysis of said semisubmersible platform, obtain said semi-submersible type platform structure connected node place nominal stress scope, the nominal stress scope multiply by SCF can obtain the tired lifetime one chance focus range of stress of checking node structure.
Said semisubmersible platform operation marine site is a South China Sea.
The present invention is owing to take above technical scheme; It has the following advantages: 1, the present invention proposes the tired simplified design method of semi-submersible type platform structure that a cover is applicable to the South China Sea environmental baseline; Filled up the blank to the design method for simplifying fatigue for semi-submersible type platform structure of South Sea marine environment condition, this method is compared with the spectrum fatigue analysis method with the determinacy fatigue analysis method and has been significantly reduced structure analysis of fatigue workload.2, the present invention proposes a cover and meets maximum permissible stress scope curve to the platform structure lifetime one of South China Sea Environment condition; Can be applicable to the Fatigue Design of South China Sea Environment condition lower platform structure, can significantly reduce workload to South China Sea marine environment condition design method for simplifying fatigue for semi-submersible type platform structure.3, the present invention is directed to South China Sea marine environment condition, propose the exact value of the long-term Weibull distribution parameter of the simplifying fatigue for semi-submersible type platform structure analytical structure range of stress, the feasible simplification fatigue analysis method analysis result that is somebody's turn to do is accurate more, reliable.In sum, it is little that the existing platform structure Fatigue Design method of the design method for simplifying fatigue for semi-submersible type platform structure that the present invention proposes has workload, and result of calculation is advantage accurately, can be applicable to the structural fatigue design of South China Sea marine site semisubmersible platform.
Description of drawings
Fig. 1 is simplifying fatigue for semi-submersible type platform structure analysis process figure of the present invention
Fig. 2 is structural life-time phase one a chance maximum permissible stress scope curve under the corrosion protection condition of the present invention
Fig. 3 is structural life-time phase one a chance maximum permissible stress scope curve in the air of the present invention
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
As shown in Figure 1, the present invention includes following steps:
1, carry out the Long-term forecasting of semisubmersible platform (hereinafter to be referred as platform) seaway load:
According to platform operation marine site long-term sea data computing platform seaway load; Platform lifetime one is met seaway load carry out Long-term forecasting; Obtain platform lifetime one and meet highest wave load, comprise horizontal wave tear edge, horizontal wave torsional moment, vertical wave shearing force, vertical wave bending moment, vertical deck mass inertial force and horizontal deck mass inertial force.
2, confirm the long-term Weibull distribution shape of platform structure stress parameter:
1. set up the one-piece construction finite element model of platform, carry out of the one-piece construction finite element analysis of different waves to, different wave frequencies condition lower platforms.
2. calculate each wave to platform different structure position stress response transport function; Carry out the structural stress analysis of spectrum in conjunction with the long-term sea data in platform operation marine site, obtain the average of platform different parts structural stress long-term Weibull distribution shape parameter and stress response and spend null cycle.
If do not carry out this work, then platform structure stress Weibull distribution shape parameter recommends to get 1.
3, confirm platform structure lifetime one chance maximum permissible stress scope curve:
It's null cycle pasts requirement and the long-term stress response of structure average that met or exceeded based on ABS SN curve, structure fatigue life 30 years derives platform structure lifetime one and meets maximum permissible stress scope curve, comprises that being immersed in the seawater under the corrosion protection condition structural life-time phase one meets structural life-time phase one chance maximum permissible stress scope curve (as shown in Figure 3) in maximum permissible stress scope curve (as shown in Figure 2) and the air.Among the figure; Structural life-time phase one chance maximum permissible stress scope curve B, C, D, E, F, F2, G, W represent the pairing ABS SN of this curve curve classification; ABS SN curve is the structural fatigue as analysed basis directrix curve that American Bureau of Shipping is recommended, and is existing general offshore engineering structure Fatigue Design foundation.
4, the computing platform structural life-time phase one is met the focus range of stress:
According to the platform specific constructive form; Select corresponding structure lifetime one to meet the characteristic wave wave load; Carry out the one-piece construction finite element analysis of platform; Obtain platform structure connected node place nominal stress scope, the nominal stress scope multiply by SCF can obtain the tired lifetime one chance focus range of stress of checking node structure.Wherein SCF is actual is stress amplification coefficient, can be confirmed by calculating of finite element refined net or general specification.
5, Evaluation Platform structure fatigue life:
1. to platform different structure form, in the ABS standard, find out the corresponding ABS SN of its structural fatigue analysis curve classification.
2. choose corresponding structure lifetime one according to this ABS SN curve classification and meet maximum permissible stress scope curve, and on this curve, find the structural life-time phase one to meet the maximum permissible stress scope according to the long-term Weibull distribution shape of the structural stress parameter value of confirming in the step 2.
3. comparative structure lifetime one is met the maximum focus range of stress and is met the maximum permissible stress scope with the structural life-time phase one: if the structural life-time phase one meet the maximum focus range of stress less than structural life-time phase one chance maximum permissible stress scope so structural design meet the demands, otherwise do not meet the demands.
Certain semisubmersible platform with operation under the South China Sea environmental baseline is the practical implementation case below, and the inventive method is further specified.In the present embodiment, in 30 years this platform design life-spans, analyze this platform strut near whether meeting the demands fatigue lifetime of column place structure.
1, according to the South China Sea environmental baseline, 30 years lifetime one of this platform are met seaway load carry out Long-term forecasting, obtain 30 years lifetime one of this platform and meet highest wave load.The maximum transverse force that in this instance this platform is suffered, maximum transversal moment of torsion, maximum longitudinal shear, maximum vertical moment of flexure, maximum vertically deck mass inertial force and maximum horizontal deck six kinds of characteristic hydrodynamic loads of mass inertial force carry out Long-term forecasting; Obtain corresponding Fatigue Design load, be used for 30 years lifetime one of computation structure and meet the maximum focus range of stress.
2, study this platform structural stress LONG-TERM DISTRIBUTION under the South China Sea environment, consider that structural symmetry selects the many places structural region to carry out long-term stress analysis.The result shows each regional structure stress LONG-TERM DISTRIBUTION of column, buoyancy tank and upper deck structure Weibull form parameter between 0.9～1, and each regional structure stress LONG-TERM DISTRIBUTION Weibull form parameter of pole structure is between 0.84～0.88.In order to ensure the security of Platform Structure Design, should get 1 for pillar construction, floating box structure and upper deck structure Weibull form parameter in simplifying analysis of fatigue.Should get 0.88 for pole structure Weibull form parameter in simplifying analysis of fatigue.
For deep water semi-submersible drilling platform, if lack structural stress LONG-TERM DISTRIBUTION data under the condition of the South Sea, the long-term Weibull distribution shape of stress parameter gets 1 in the platform structure simplification analysis of fatigue.
3,30 years structural life-time phases internal stress round-robin on average is about 6.3 seconds excessively null cycle under the South China Sea Environment condition, and stress-number of cycles is about 1.5 * 10
8Inferior, derive to the South Sea marine environment condition structural fatigue maximum permissible stress scope curve (like Fig. 2, shown in Figure 3) and the value (shown in table 1, table 2) in 30 years serviceable life simultaneously based on ABS SN curve:
30 year life-span of structure maximum permissible stress scope value under the table 1 South China Sea Environment corrosion protection condition
30 year life-span of structure maximum permissible stress scope value in the table 2 South China Sea Environment air
Wherein, the unit in table 1 and the table 2 is MPa.
4, analysis platform version and selected structure present position, when platform suffered wave maximum transversal moment of torsion, this place's structural stress scope was the highest.Consider that structural stress is concentrated, calculating the maximum focus range of stress of this place's structure is 160.2MPa.
5, in Fig. 2 or Fig. 3, choose 30 years lifetime one chance maximum permissible stress scope curves of structure according to structural stress long-term Weibull distribution shape parameter and structure concrete form based on corresponding SN curve.In this instance, the tired position of checking is in strut inside, calculate tired when checking focus stress by the influence of consideration bracket with not ing.Therefore, in Fig. 3, choose the structure maximum permissible stress scope curve of checking SN curve A BS-F2 (A) and check the fatigue lifetime of platform strut near column place strut strong frame and longeron connected node based on structural fatigue in the ABS air.The long-term Weibull distribution shape of structural stress parameter gets 0.88, and check in corresponding construction maximum permissible stress scope this moment in table 2 be 201MPa, and the maximum focus range of stress of pole structure is 160.2MPa, satisfies requirement fatigue lifetime in following 30 year of South China Sea Environment condition.
The present invention only describes with the foregoing description; The structure of each parts, the position is set and connects and all can change to some extent; On the basis of technical scheme of the present invention; All improvement and equivalents of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (2)
1. design method for simplifying fatigue for semi-submersible type platform structure, it may further comprise the steps:
1) carries out the Long-term forecasting of semisubmersible platform seaway load: calculate said semisubmersible platform seaway load according to the long-term sea data in said semisubmersible platform operation marine site; Said semisubmersible platform lifetime one is met seaway load carry out Long-term forecasting; Obtain said semisubmersible platform lifetime one and meet highest wave load, it comprises horizontal wave tear edge, horizontal wave torsional moment, vertical wave shearing force, vertical wave bending moment, vertical deck mass inertial force and horizontal deck mass inertial force;
2) confirm the long-term Weibull distribution shape of semi-submersible type platform structure stress parameter: 1. set up the one-piece construction finite element model of said semisubmersible platform, carry out the one-piece construction finite element analysis of different waves said semisubmersible platform under, different wave frequencies condition; 2. calculate each wave to said semisubmersible platform different structure position stress response transport function; Carry out the structural stress analysis of spectrum in conjunction with the long-term sea data in said semisubmersible platform operation marine site, obtain the average of said semisubmersible platform different parts structural stress long-term Weibull distribution shape parameter and stress response and spend null cycle;
3) confirm that semi-submersible type platform structure lifetime one meets maximum permissible stress scope curve: it's null cycle pasts requirement and the long-term stress response of structure average that met or exceeded based on ABS SN curve, structure fatigue life 30 years derives said semi-submersible type platform structure lifetime one and meets maximum permissible stress scope curve, comprises that being immersed in the seawater under the corrosion protection condition structural life-time phase one meets structural life-time phase one chance maximum permissible stress scope curve in maximum permissible stress scope curve and the air;
4) calculate semi-submersible type platform structure lifetime one and meet the focus range of stress: according to said semisubmersible platform specific constructive form; Select corresponding structure lifetime one to meet the characteristic wave wave load; Carry out the one-piece construction finite element analysis of said semisubmersible platform; Obtain said semi-submersible type platform structure connected node place nominal stress scope, the nominal stress scope multiply by SCF can obtain the tired lifetime one chance focus range of stress of checking node structure;
5) assessment semi-submersible type platform structure fatigue lifetime: 1., in the ABS standard, find out the corresponding ABS SN of its structural fatigue analysis curve classification to platform different structure form; 2. choose corresponding structure lifetime one according to this ABS SN curve classification and meet maximum permissible stress scope curve, and on this curve according to step 2) in the long-term Weibull distribution shape of the structural stress parameter value confirmed find the structural life-time phase one to meet the maximum permissible stress scope; 3. comparative structure lifetime one is met the maximum focus range of stress and is met the maximum permissible stress scope with the structural life-time phase one: if the structural life-time phase one meet the maximum focus range of stress less than structural life-time phase one chance maximum permissible stress scope then structural design meet the demands, otherwise do not meet the demands.
2. a kind of design method for simplifying fatigue for semi-submersible type platform structure as claimed in claim 1 is characterized in that: said semisubmersible platform operation marine site is a South China Sea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100903318A CN101615215B (en) | 2009-08-05 | 2009-08-05 | Design method for simplifying fatigue for semi-submersible type platform structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100903318A CN101615215B (en) | 2009-08-05 | 2009-08-05 | Design method for simplifying fatigue for semi-submersible type platform structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101615215A CN101615215A (en) | 2009-12-30 |
| CN101615215B true CN101615215B (en) | 2012-05-09 |
Family
ID=41494854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100903318A Active CN101615215B (en) | 2009-08-05 | 2009-08-05 | Design method for simplifying fatigue for semi-submersible type platform structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101615215B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926399B (en) * | 2012-11-13 | 2014-11-12 | 国电联合动力技术有限公司 | Offshore fan pile foundation design method and application thereof |
| CN104354829B (en) * | 2014-10-20 | 2017-01-11 | 中国海洋大学 | Fatigue testing device of ocean platform |
| CN104392060B (en) * | 2014-12-04 | 2016-04-20 | 国家电网公司 | Based on the electroceramics type electrical equipment seismic failure probability evaluation method of failure of total probability theory |
| CN105117569B (en) * | 2015-09-28 | 2018-06-15 | 南通中远船务工程有限公司 | The design method of semisubmersible drilling platform mud pump mount base |
| CN105279312B (en) * | 2015-09-28 | 2018-07-06 | 南通中远船务工程有限公司 | FPSO upper module structure analysis methods based on GeniE modelings |
| CN108229029A (en) * | 2018-01-05 | 2018-06-29 | 哈尔滨工程大学 | Semi-submersible offshore platform structure safety monitoring point choosing method |
| CN109614689B (en) * | 2018-12-07 | 2022-12-13 | 大连船舶重工集团有限公司 | Method for determining long-term fatigue life of ship structure under combined load action |
| CN110378019B (en) * | 2019-07-18 | 2023-05-05 | 上海交通大学 | Semi-submersible platform fatigue damage assessment method combining offshore actual measurement and numerical analysis |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1194376A (en) * | 1997-01-10 | 1998-09-30 | 新日本制铁株式会社 | Diagnostic method for steel structure fatigue life and iron and steel parts with life diagnostic function |
| WO2002041193A1 (en) * | 2000-11-18 | 2002-05-23 | The University Of Sheffield | Nonlinear systems |
| CN101344461A (en) * | 2008-06-11 | 2009-01-14 | 上海海事大学 | Fatigue strength prediction technique by stress amplitude method |
-
2009
- 2009-08-05 CN CN2009100903318A patent/CN101615215B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1194376A (en) * | 1997-01-10 | 1998-09-30 | 新日本制铁株式会社 | Diagnostic method for steel structure fatigue life and iron and steel parts with life diagnostic function |
| WO2002041193A1 (en) * | 2000-11-18 | 2002-05-23 | The University Of Sheffield | Nonlinear systems |
| CN101344461A (en) * | 2008-06-11 | 2009-01-14 | 上海海事大学 | Fatigue strength prediction technique by stress amplitude method |
Non-Patent Citations (2)
| Title |
|---|
| 刘洪涛.随机波浪荷载作用下海洋导管架平台疲劳寿命预测分析.《天津大学硕士学位论文》.2009,全文. * |
| 方华灿,吴小薇.海洋石油平台结构系统的疲劳寿命预测.《机械强度》.2002,第24卷(第1期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101615215A (en) | 2009-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101615215B (en) | Design method for simplifying fatigue for semi-submersible type platform structure | |
| Dong et al. | Long-term fatigue analysis of multi-planar tubular joints for jacket-type offshore wind turbine in time domain | |
| Xu et al. | Effect of hydrodynamic load modelling on the response of floating wind turbines and its mooring system in small water depths | |
| Jiang et al. | Design, modelling, and analysis of a large floating dock for spar floating wind turbine installation | |
| Zhao et al. | Numerical modeling and analysis of the dynamic motion response of an offshore wind turbine blade during installation by a jack-up crane vessel | |
| CN111625980A (en) | FPSO structure fatigue life calculation method | |
| Qin et al. | Review on recent research and technical challenges of floatover installation operation | |
| Bachynski et al. | Linear and nonlinear analysis of tension leg platform wind turbines | |
| Yue et al. | Analysis of the wave load and dynamic response of a new semi-submersible wave-energy-powered aquaculture platform | |
| Khan et al. | Nonlinear dynamic analysis of marine risers under random loads for deepwater fields in Indian offshore | |
| CN109614689A (en) | A kind of method in determining Ship Structure chronic fatigue service life under combined load effect | |
| Jacobsen et al. | Numerical and experimental studies of submerged towing of a subsea template | |
| Yang et al. | Analysis of Mooring Lines for Wave Energy Converters: A Comparison of De-Coupled and Coupled Simulation Procedures | |
| Hong et al. | Hydrodynamic and environmental modelling influence on numerical analysis of an innovative installation method for floating wind | |
| Matsuoka et al. | 2015S-OS1-1 Verification of Precision Concerning the Design of Advanced Spar Type Structure | |
| Bian et al. | Manage tensioner stroke for dry tree semisubmersibles | |
| Jameel et al. | Wind induced nonlinear response of coupled spar platform | |
| Akbarizadeh et al. | Comparative study of TLP and ETLP performance in Caspian Sea environment using numerical method | |
| Silva de Souza et al. | Calibration of a Time-Domain Hydrodynamic Model for A 12 MW Semi-Submersible Floating Wind Turbine | |
| Edesess et al. | Offshore monopile in the southern North Sea: Part I, calibrated input sea state | |
| Mendikoa | Numerical Approaches for Loads and Motions Assessment of Floating WECs Moored by Means of Catenary Mooring Systems | |
| Huijs | The influence of steel catenary risers on the first order motions of a semi submersible | |
| Zhu et al. | Investigation of Fatigue Damage for Stiffened Plates in Splash Zone for a Semi-Submersible | |
| Vartdal | An Investigation of Offshore Wind Installation Strategies-A Discrete-Event Simulation Model Used to Investigate Installation Vessel Operability | |
| Wang et al. | Truss spar strength and fatigue analysis for wet tow |
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 | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee after: China National Offshore Oil Corporation Patentee after: CNOOC Research Institute Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Patentee before: China National Offshore Oil Corporation Patentee before: CNOOC Research Center |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CNOOC research institute limited liability company Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CNOOC Research Institute Patentee before: China National Offshore Oil Corporation |