CN102966345A - Simulation well system for testing electromagnetic wave resistivity logging instrument - Google Patents
Simulation well system for testing electromagnetic wave resistivity logging instrument Download PDFInfo
- Publication number
- CN102966345A CN102966345A CN2012105182416A CN201210518241A CN102966345A CN 102966345 A CN102966345 A CN 102966345A CN 2012105182416 A CN2012105182416 A CN 2012105182416A CN 201210518241 A CN201210518241 A CN 201210518241A CN 102966345 A CN102966345 A CN 102966345A
- Authority
- CN
- China
- Prior art keywords
- resistivity
- layer
- electromagnetic wave
- logging instrument
- test
- 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
Abstract
The invention discloses a simulation well system for testing an electromagnetic wave resistivity logging instrument, and overcomes the defect that a conventional simulation well system cannot meet the test requirement of the electromagnetic wave resistivity logging instrument. The system comprises a model stratum and a borehole layer longitudinally penetrating the center of the model stratum, wherein the borehole layer comprises a simulation borehole through which the electromagnetic wave resistivity logger can pass; the model stratum comprises a uniform dielectric layer, a resistivity anisotropy layer and a buffer layer which are distributed longitudinally; the uniform dielectric layer simulates a stratum section of which the horizontal resistivity and the vertical resistivity are the same; the resistivity anisotropy layer simulates a stratus section of which the horizontal resistivity and the vertical resistivity are different; and the buffer layer isolates the uniform dielectric layer and the resistivity anisotropy layer from outside environment. According to embodiment of the invention, the electromagnetic wave resistivity logging instrument has a non-inductive and non-magnetic testing system, and can perform operation and test efficiently and safely.
Description
Technical field
The present invention relates to the experimental technique of logging instrument, relate in particular to a kind of simulation well system for test electromagnetic wave resistivity logging instrument.
Background technology
A kind of novel logger is before coming into operation, and big city is through the development of theoretical research, experimental study and model machine, just carries out at last large batch of production and comes into operation.
For a novel logger, experimental study is very crucial, whether with theoretical expectation consistent, thereby the feasibility of the correctness of proof theory and scheme also can provide guidance to the parameter designing of instrument according to result of the test simultaneously if both can be used to evaluation appts response.So the research and development of logger all be unable to do without test, testing circumstance is most important to the research and development of instrument reliably.
Many components EPT is mainly used in the well logging during field, compare traditional single shaft Electromagnetic Wave Propagation logging while drilling apparatus, this instrument can general measure formation resistivity parameter, can also measure the azimuth, and to rely on many components coil array be that geosteering while drilling is offered help to the sensitivity of bed boundary.The multiple-component induction logging instrument is mainly used in the wireline logging field, its characteristics are can also survey the stratum vertical resistivity when surveying conventional stratum horizontal resistivity, in the resistivity anisotropy layer such such as the thin mutual reservoir of husky mud stone of lamination, correct geologic assessment can not be made to overcome conventional induction log tool, thereby underestimating even leak situation about estimating oil-gas Layer may be occurred.
For can evaluation appts response under a model of determining whether consistent with the Theoretical Prediction value; at first requiring the test well model is known deterministic models; usually can be at a underground very large round pool, the salting liquid of the certain electrical conductivity of filling in the pond built.Induction logging instrument is usually larger to the investigative range on stratum, is 90 inches (in) such as the maximum probe degree of depth of array induction logging tool (AIT), and its to the responsive degree of depth on stratum much larger than 90in.If model well is built in underground; the response contribution that the outer actual formation of well bucket is understood induction instrument aratus usually is larger; and actual formation is generally the heterogeneity medium; its electrical conductivity is unknown; and electrical conductivity can change with the humidity on stratum, so the outer stratum of well bucket does not wish to see on the impact research and development testing crew of induction instrument aratus response.In order to obtain a known deterministic test model, just need to set up the very large subsurface model well of scale, and model well needs to change electrical conductivity in process of the test, need often change water, thereby required cost is high.The another kind of method that reduces model well is that model well is built in the earth's surface.Model well is built in the words on earth's surface, the model well outside is the air of noninductive environment, so it can be seen as radially two-layer known models, has built the test well of an induction logging instrument on the earth's surface if any testing crew, its diameter is 14 feet (ft), highly is 20ft.But have problems: it is stable and noninductive without magnetic what material to build the guarantee testing circumstance with, build in and be not equal to the impact that is not subjected to the earth and even model well basis fully on the earth's surface, how test environment is noninductive builds instrument lifting gear and transmitting device in without the situation of magnetic on test well not affecting, efficient and safety when how to improve the model well test also are necessary, etc.
The electromagnetic wave resistivity logging instrument is a kind of logger that comes the Formation Resistivity Measurement parameter by transmitting-receiving radio magnetic wave, it comprises all kinds of EPTs for well logging during, all kinds of EPTs that are used for wireline logging are for all kinds of induction log tools of wireline logging.
The test of electromagnetic wave resistivity logging instrument is also very strict to the requirement of environment, and instrument is noninductive without magnetic in 10 meters except vertical direction during test, and the testing circumstance electrical quantity is stable, and security requirement is also higher.Existing ground or underground pond all are difficult to satisfy preferably the test requirements document of electromagnetic wave resistivity logging instrument.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency that existing simulation well system is difficult to better to satisfy the test requirements document of electromagnetic wave resistivity logging instrument.
In order to solve the problems of the technologies described above, the invention provides a kind of simulation well system for test electromagnetic wave resistivity logging instrument, the well layer that comprises the model stratum and vertically run through described model stratum central authorities, wherein:
Described well layer includes the simulation well that described electromagnetic wave resistivity logging instrument can pass through;
Described model stratum includes uniform dielectric layer, resistivity anisotropy layer and the cushion coat of vertical distribution, the described uniform dielectric layer dummy level resistivity stratomere identical with vertical resistivity, the described resistivity anisotropy layer dummy level resistivity stratomere different with vertical resistivity, described cushion coat is isolated described uniform dielectric layer and resistivity anisotropy layer and external environment condition.
Preferably, be arranged alternately thin solid and the liquid that contains hole in the described resistivity anisotropy layer.
Preferably, be arranged alternately the described liquid of the described thin solid of tool conductive capability and tool conductive capability in the described resistivity anisotropy layer.
Preferably, be arranged alternately in the described resistivity anisotropy layer and do not have the described liquid of the described thin solid of conductive capability and tool conductive capability.
Preferably, be filled with the conducting medium of isotropic in the described cushion coat.
Preferably, the below of described cushion coat position and described uniform dielectric layer and resistivity anisotropy layer.
Preferably, this system comprises:
Insulating base carries described well layer and model stratum.
Preferably, this system comprises:
The lifting transmission subsystem is lifted by crane described electromagnetic wave resistivity logging instrument when carrying out described test, for described electromagnetic wave resistivity logging instrument provides electric power and communications facility.
Preferably, this system comprises:
The dosing subsystem is for described model stratum provides conducting medium.
Compared with prior art, the application's embodiment can operate efficiently and safely and test for the electromagnetic wave resistivity logging instrument provides a noninductive test macro without magnetic.The application's embodiment is when testing the electromagnetic wave resistivity logging instrument, instrument is noninductive without magnetic in 10 meters except vertical direction, and the testing circumstance electrical quantity is stable, can verify that many components logging instrument is to the anisotropic sensitivity of formation resistivity, and simple to operate efficient, safe.
Other features and advantages of the present invention will be set forth in the following description, and, partly from manual, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in manual, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and consists of the part of manual, is used from the application's embodiment one and explains technical scheme of the present invention, does not consist of the restriction to technical solution of the present invention.
Fig. 1 is the organigram of the simulation well system that is used for test electromagnetic wave resistivity logging instrument of the embodiment of the present application.
Fig. 2 is the organigram of another simulation well system that is used for test electromagnetic wave resistivity logging instrument of the embodiment of the present application.
Fig. 3 is the organigram of the 3rd simulation well system that is used for test electromagnetic wave resistivity logging instrument of the embodiment of the present application.
The specific embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.Each feature among the embodiment of the present application and the embodiment mutually combining under the prerequisite of not conflicting mutually is all within protection scope of the present invention.
As shown in Figure 1, the simulation well system that is used for test electromagnetic wave resistivity logging instrument of the embodiment of the present application includes the main water pot 10 that mainly is made of well layer 110 and model stratum 120.
The external diameter on model stratum 120 is the internal diameter of main water pot 10, and model stratum 120 includes uniform dielectric layer 121, resistivity anisotropy layer 122 and cushion coat 123 in the vertical from top to bottom successively.
The uniform dielectric layer 121 dummy level resistivity stratomere identical with vertical resistivity is for the test of the isotropism detectivity of electromagnetic wave resistivity logging instrument provides testing circumstance.The test of the anisotropy detectivity of resistivity anisotropy layer 122 electromagnetic wave resistivity logging instrument.Cushion coat 123 mainly is that uniform dielectric layer 121 and resistivity anisotropy layer 122 are isolated with external environment condition; so that uniform dielectric layer 121 and resistivity anisotropy layer 122 are carried out electromagnetic protection; avoid surrounding environment especially largely on the impact of tester, guarantee the stable of test environment electrical quantity.
Among the application's the embodiment, the upper and lower relation of uniform dielectric layer 121 and resistivity anisotropy layer 122 can be changed.Also namely, resistivity anisotropy layer 122 also can be arranged at the top of uniform dielectric layer 121.
Be provided with the isotropism conducting medium in the uniform dielectric layer 121.Among the application's the embodiment, the isotropism conducting medium that arranges in the uniform dielectric layer 121 is the salting liquid with certain electrical conductivity.
The resistivity anisotropy layer 122 dummy level resistivity stratomere different with vertical resistivity, for the test of the anisotropy detectivity of electromagnetic wave resistivity logging instrument provides testing circumstance, this stratomere is generally the thin mutual reservoir of husky mud stone.Among the application's the embodiment, be arranged alternately the thin solid and the liquid that contain hole in the resistivity anisotropy layer 122, the thin solid and the liquid that wherein contain hole have conductive capability separately.Among the application's the embodiment, thin solid also can be isolator.
The application's embodiment comes the dummy level resistivity stratomere different with vertical resistivity by being arranged alternately thin solid and the liquid that contains hole, with the performance of test logging instrument horizontal resistivity and vertical resistivity.
Among the application's the embodiment, can change as required the resistivity value of resistivity anisotropy layer 122.
Among the application's the embodiment, although resistivity anisotropy layer 122 used material itself do not have anisotropy, by the stack combinations of whole material layer, on macroscopic view, can equivalence be anisotropic material, simulate the characteristic of anisotropic material with this.
Among the application's the embodiment, be filled with the isotropic conducting medium in the cushion coat 123, such as salting liquid.Be handled easily, the resistivity of salting liquid can be consistent with the salting liquid resistivity of other layers in the main water pot 10 in the cushion coat 123.Cushion coat 123 is the bigger the better highly in theory, but only needs in the practical operation to guarantee that various loggers are not disturbed by the earth response signal in resistivity anisotropy layer 122 and get final product.
As shown in Figure 1, among the application's the embodiment, main water pot 10 can be arranged on the insulating base 15.Because insulating base 15 and electrical resistivity of earth layer around are difficult for measuring, and very unstable with Changes in weather, and generally can adopt insulating support to support main water pot 10, are not suitable for the test of uniform dielectric layer 121 and 122 pairs of logging instrument of resistivity anisotropy layer.The application's embodiment, the main water pot 10 that includes well layer 110 and model stratum 120 is carried on the insulating base 15, can further avoid surrounding environment on the impact on well layer 110 and model stratum 120 etc.
Among the application's the embodiment, can adopt high strength, alkali proof fiber to strengthen polymer (FRP) muscle and replace traditional reinforcing bar to build insulating base 15.Noninductive without magnetic for the guarantee test environment, therefore the construction of system's ground to be had higher requirement, traditional reinforced concrete structure can not satisfy the instructions for use of this cover system.The application's embodiment adopts the alkaline-resisting screw thread glass fiber reinforced plastic of high strength, carries out infrastructure in order to replace traditional reinforcing bar.
Be convenient working personnel's operation and operation, the application's embodiment also comprises and is arranged on main water pot 10 peripheral and noninductive framework platforms without magnetic, convenient working personnel ascend operation.
Above-mentioned main water pot 10 and insulating base 15 can be collectively referred to as the test subsystem.
As shown in Figure 2, the application's embodiment can also comprise lifting transmission subsystem 20, lifts by crane logging instrument and for logging instrument provides electric power and communications facility, make things convenient for logging instrument to utilize this test subsystem to carry out various tests when carrying out the test of logging instrument.
Among the application's the embodiment, lifting transmission subsystem 20 mainly is comprised of pillar crane and logging cable, and being provides the accessory system of power with the power supply of communicating by letter for logging instrument.Logging cable from ground system along the tower fuselage, tower horn, suspension hook introduce the instrument string of logging instrument.Because the design feature of pillar crane, can satisfy instrument when test in the test subsystem guarantee around in 10 meters without metal (the vertical direction logging cable does not affect well logging), avoid transmission line directly to cause the noninductive non-magnetic environment of ground failure from simulating well layer 110.During test, lifting transmission subsystem 20 can guarantee to carry out exchanges data and keep power supply with ground system when logging instrument moves both vertically in the test subsystem.
As shown in Figure 3, the application's embodiment can also comprise dosing subsystem 30, link to each other with uniform dielectric layer 121, resistivity anisotropy layer 122 and cushion coat 123 in the model stratum 120, for model stratum 120 grades in the test subsystem provide the conducting medium with certain resistivity.Among the application's the embodiment, conducting medium is such as being salting liquid, and dosing subsystem 30 consists predominantly of to the injection pump of testing filling liquid in the subsystem, extracts the excavationg pump of liquid and the dosing drainage pump that dosing subsystem 30 self discharges out from the test subsystem.Among the application's the embodiment, in the dosing subsystem 30 diving mixer can also be set.Diving mixer can stir the required conducting liquid of test rapidly at short notice.With circulation in the traditional dependence water pot salt is melted and make the uniform operating type of salt solution, the dosing subsystem 30 in the embodiment of the present application can save time and the energy in a large number.
Generally adopt the thin layer intermeshing of fixed resistance rate to come simulation well resistivity anisotropy stratum to compare with the traditional analog environment, compare the electrical conductivity (in other words resistivity) that can more easily change as required anisotropic band with application.
Traditional simulation well is compared with the present invention and is not designed cushion coat, and the earth is obvious on the impact that test environment produces.Because it is uncertain that the electrical quantity of the earth exists with weather, this impact is to be difficult to eliminate.The application has overcome the impact of the external factors such as the earth on test environment by cushion coat is set, and has improved the test accuracy.
Although the disclosed embodiment of the present invention as above, the embodiment that described content only adopts for ease of understanding the present invention is not to limit the present invention.Those of skill in the art under any the present invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; can carry out any modification and variation in form and the details implemented; but scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.
Claims (9)
1. simulation well system that is used for test electromagnetic wave resistivity logging instrument, the well layer that comprises the model stratum and vertically run through described model stratum central authorities, wherein:
Described well layer includes the simulation well that described electromagnetic wave resistivity logging instrument can pass through;
Described model stratum includes uniform dielectric layer, resistivity anisotropy layer and the cushion coat of vertical distribution, the described uniform dielectric layer dummy level resistivity stratomere identical with vertical resistivity, the described resistivity anisotropy layer dummy level resistivity stratomere different with vertical resistivity, described cushion coat is isolated described uniform dielectric layer and resistivity anisotropy layer and external environment condition.
2. system according to claim 1, wherein:
Be arranged alternately thin solid and the liquid that contains hole in the described resistivity anisotropy layer.
3. system according to claim 2, wherein:
Be arranged alternately the described liquid of the described thin solid of tool conductive capability and tool conductive capability in the described resistivity anisotropy layer.
4. system according to claim 2, wherein:
Be arranged alternately in the described resistivity anisotropy layer and do not have the described liquid of the described thin solid of conductive capability and tool conductive capability.
5. system according to claim 1, wherein:
Be filled with the conducting medium of isotropic in the described cushion coat.
6. system according to claim 1, wherein:
The below of described cushion coat position and described uniform dielectric layer and resistivity anisotropy layer.
7. system according to claim 1, wherein, this system comprises:
Insulating base carries described well layer and model stratum.
8. system according to claim 1, wherein, this system comprises:
The lifting transmission subsystem is lifted by crane described electromagnetic wave resistivity logging instrument when carrying out described test, for described electromagnetic wave resistivity logging instrument provides electric power and communications facility.
9. system according to claim 1, wherein, this system comprises:
The dosing subsystem is for described model stratum provides conducting medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210518241.6A CN102966345B (en) | 2012-12-05 | 2012-12-05 | A kind of simulation well system for testing electromagnetic wave resistivity logging instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210518241.6A CN102966345B (en) | 2012-12-05 | 2012-12-05 | A kind of simulation well system for testing electromagnetic wave resistivity logging instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102966345A true CN102966345A (en) | 2013-03-13 |
| CN102966345B CN102966345B (en) | 2015-08-05 |
Family
ID=47796748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210518241.6A Active CN102966345B (en) | 2012-12-05 | 2012-12-05 | A kind of simulation well system for testing electromagnetic wave resistivity logging instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102966345B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317428A (en) * | 2014-06-24 | 2016-02-10 | 中国石油天然气集团公司 | Method and device for determining electromagnetic channel model |
| CN109577963A (en) * | 2018-10-19 | 2019-04-05 | 中国石油天然气股份有限公司 | Simulate the device and its construction method of the response of anisotropic formation array lateral logging |
| CN110107278A (en) * | 2019-04-11 | 2019-08-09 | 西南石油大学 | Open-hole logging processing simulation method |
| CN114135270A (en) * | 2021-11-19 | 2022-03-04 | 傅宇涵 | Oil and natural gas exploitation logging instrument in pit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201037411Y (en) * | 2007-04-10 | 2008-03-19 | 中国海洋石油总公司 | Well logger scale device and system thereof |
| CN101377130A (en) * | 2008-09-18 | 2009-03-04 | 中国海洋石油总公司 | Experiment well for testing multiple-component induction logging instrument |
| CN101609170A (en) * | 2009-07-14 | 2009-12-23 | 中国海洋石油总公司 | A kind of simulation well device that is used for the three-dimensional induction logging experiment |
| CN102619505A (en) * | 2012-04-25 | 2012-08-01 | 中国电子科技集团公司第二十二研究所 | Ground calibration device of instrument for electromagnetic resistivity logging while drilling |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1509676A1 (en) * | 1987-02-24 | 1989-09-23 | Ленинградская лесотехническая академия им.С.М.Кирова | Apparatus for studying filter properties of fibrous masses |
-
2012
- 2012-12-05 CN CN201210518241.6A patent/CN102966345B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201037411Y (en) * | 2007-04-10 | 2008-03-19 | 中国海洋石油总公司 | Well logger scale device and system thereof |
| CN101377130A (en) * | 2008-09-18 | 2009-03-04 | 中国海洋石油总公司 | Experiment well for testing multiple-component induction logging instrument |
| CN101609170A (en) * | 2009-07-14 | 2009-12-23 | 中国海洋石油总公司 | A kind of simulation well device that is used for the three-dimensional induction logging experiment |
| CN102619505A (en) * | 2012-04-25 | 2012-08-01 | 中国电子科技集团公司第二十二研究所 | Ground calibration device of instrument for electromagnetic resistivity logging while drilling |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105317428A (en) * | 2014-06-24 | 2016-02-10 | 中国石油天然气集团公司 | Method and device for determining electromagnetic channel model |
| CN105317428B (en) * | 2014-06-24 | 2019-05-07 | 中国石油天然气集团公司 | Determine the method and device of electromagnetic signal channel model |
| CN109577963A (en) * | 2018-10-19 | 2019-04-05 | 中国石油天然气股份有限公司 | Simulate the device and its construction method of the response of anisotropic formation array lateral logging |
| CN110107278A (en) * | 2019-04-11 | 2019-08-09 | 西南石油大学 | Open-hole logging processing simulation method |
| CN114135270A (en) * | 2021-11-19 | 2022-03-04 | 傅宇涵 | Oil and natural gas exploitation logging instrument in pit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102966345B (en) | 2015-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102565875B (en) | Method and device for checking scales of resistivity logging instrument | |
| CN106814407B (en) | The method for determining Three-dimensional Rock crustal stress based on single borehole deformation measurement | |
| CN202220598U (en) | Three-dimensional electric analog experiment device of horizontal well exploitation | |
| CN104631517A (en) | Bored pile concrete interface monitoring device and method | |
| CN102966345B (en) | A kind of simulation well system for testing electromagnetic wave resistivity logging instrument | |
| CN104614242A (en) | Excavation and surrounding rock stress and strain monitoring model testing device for rock-soil chamber under complicated conditions, and method thereof | |
| CN106638725A (en) | Pipe pile soil squeezing effect testing apparatus and method | |
| CN106032748B (en) | Hydraulic fracturing crack propagation rule detection method based on drilling Transient Electromagnetic Technique | |
| CN104502419B (en) | Device and method for evaluating self-healing capacity of self-healing cement | |
| CN102900423B (en) | Gel-based solid physical simulator for electrical logging detector and forming method of gel-based solid physical simulator | |
| CN103308393B (en) | Formation fracturing resistance testing device and method | |
| CN103562752B (en) | The measurement of stratum maximum depth of exploration | |
| Feng et al. | A capacity prediction model for the low porosity fractured reservoirs in the Kuqa foreland basin, NW China | |
| CN102606136B (en) | Logging-while-drilling value response law simulated experimental device | |
| CN101377079A (en) | Method for measuring foundation bed coefficient indoor | |
| Zhan et al. | Evaluation of measurement sensitivity and design improvement for time domain reflectometry penetrometers | |
| CN111537431B (en) | Liquid CO2Phase change fracturing effect similar simulation experiment device and experiment method | |
| CN102915665B (en) | Coalbed methane earthquake physical model and making method thereof | |
| CN112096361A (en) | Experimental device and experimental method for simulating casing damage process | |
| CN204556387U (en) | Complex condition Rock And Soil adit digging and surrouding rock stress, strain monitoring model test apparatus | |
| CN101377130B (en) | Experiment well for testing multiple-component induction logging instrument | |
| CN103669426A (en) | Borehole transient electromagnetic detection method for cast-in-place pile reinforcement cage length | |
| CN102865062B (en) | Physical analog device for electrical logging detector entity built by ultrafiltration | |
| CN102619505A (en) | Ground calibration device of instrument for electromagnetic resistivity logging while drilling | |
| CN106646668B (en) | A kind of method for building up of radar logging standard well model |
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 | ||
| 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 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |