CN101100361A - Low-temperature low-density well cementing cement mortar - Google Patents
Low-temperature low-density well cementing cement mortar Download PDFInfo
- Publication number
- CN101100361A CN101100361A CNA2007101200293A CN200710120029A CN101100361A CN 101100361 A CN101100361 A CN 101100361A CN A2007101200293 A CNA2007101200293 A CN A2007101200293A CN 200710120029 A CN200710120029 A CN 200710120029A CN 101100361 A CN101100361 A CN 101100361A
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- Prior art keywords
- low
- cement
- well cementing
- density
- temperature low
- 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.)
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Links
- 239000011083 cement mortar Substances 0.000 title claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 17
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 9
- 239000006260 foam Substances 0.000 abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 239000002270 dispersing agent Substances 0.000 abstract 1
- 239000003381 stabilizer Substances 0.000 abstract 1
- 229940124024 weight reducing agent Drugs 0.000 abstract 1
- 239000013585 weight reducing agent Substances 0.000 abstract 1
- 239000011440 grout Substances 0.000 description 25
- 238000005303 weighing Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 230000008719 thickening Effects 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 1
- 150000001719 carbohydrate derivatives Chemical class 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
This invention relates to a low temperature low density cement paste for well-cementation use. It is composed (by weight percentages) of: high strength cement 40.0-62.3%; water 29.1-35%; setting accelerator 0.1-0.6%; cement retarder 0.6-0.9%; filtering-loss-reducer 4.4-5.2%; dispersing agent 0.1-0.3%; stabilizing agent 0.1-0.3%; auxiliary weight reducing agent 2-20%. This inventive low temperature low density cement paste, compared with prior art low temperature foam cement paste, has advantages of: no need of special equipment used for pouring cement paste, utilization of ordinary well-cementation equipment with controllable setting time and simple operation procedures.
Description
Technical field
The present invention relates to a kind of grout that is used for the ocean deepwater well cementing operation.
Background technology
The ocean deepwater oil-field development is the oilfield development process of a large amount of advanced exploratory development technology of needs as supporting method, and the well cementing operation in the drilling program is a wherein very important ring.Ocean deepwater has the advantages that temperature is low, pressure is high, at many deep water exploitation blocks, because the singularity of deep water geologic sedimentation, formation-parting pressure is lower, be easy to the association gas hydrate below the mud moisture interface, and often have shallow-layer stream, brought challenge to drilling operation and well cementation, need adopt different cementing technology measures at different deep water well site situations.For the deep water strata condition of complexity, the problem that runs in the well cementing operation process mainly shows:
1, temperature is low, and hydrated cementitious is slow;
2, formation-parting pressure is low, and grout is easy to leakage;
3, shallow streamlined existence, it is out of control to be easy to that pressure takes place;
4, the existence of gas hydrate, the release that in the well cementing operation process, may produce hydrate.
Ocean deepwater is because the existence of low temperature environment makes the solidifiability of grout become very poor, and it is more difficult that the control that cementing quality and fluid are scurried becomes.Under the deep water situation, the low-temperature performance of grout and anti-channeling ability are the main basic performance requriementss of mortar architecture.
Flow simultaneous complexcase for low temperature and shallow-layer, the external low-temperature low-density mortar architecture that extensively adopts solves the well cementing operation problem.The low-temperature low-density grout is a kind of mortar architecture that use in the lower area of cold district and reservoir pressure that is adapted at, and it is by sneaking into a certain proportion of low density filled media in grout, reduces the density of grout and realizes.Compare with conventional density grout, low-temperature low-density grout intensity is relatively low, and density is low, thermal conductivity is low and present the right angle solidifies characteristics.Its right angle solidifies feature (RAS) in the ocean deepwater well cementation, and particularly the stratum may have under the condition of potential shallow streamlined well site, and tool has very important significance; Its transitional quick consistency change has reduced shallow streamlined occurrence probability.
Mainly include foam slurry etc. in the low-temperature low-density mortar architecture at present, foam slurry is to charge into a certain amount of nitrogen or the method by chemical foaming in proportion with mechanical means in traditional water mud directly to make and produce gas in the grout, forms the low-density cement mortar that has stable foam.The weak point of foam slurry is very high to construction requirement, and machinery fills nitrogen needs extra nitrogen supply unit, operating device and specialized operations personnel; And chemical foaming is difficult to speed and quantity that control is got angry.There is not above defective in the low-temperature low-density grout, utilizes conventional waterflood mud equipment just can fulfil assignment, and relative costs is lower.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of low-temperature low-density well cementing cement mortar, the deficiency of having avoided the low temperature foam slurry to exist, and controllability is good, and operational procedure is simple.
A kind of low-temperature low-density well cementing cement mortar of the present invention comprises following component: high-strength cement 40.0～62.3%, water 29.1～35.0%, setting accelerator 0.1～0.6%, retardant 0.6～0.9%, fluid loss agent 4.4～5.2%, dispersion agent 0.1～0.3%, stablizer 0.1～0.3%, auxiliary light-weight additive 2～20%; Wherein, described per-cent is weight percentage.
Preferably, described fluid loss agent comprises following component: water 66～84.6%, N,N-DMAA 1～4%, 2 acrylamido-2 methyl propane sulfonic acids 12～25%, (NH4) 2S2O80.1～0.3%, ethylenediamine tetraacetic acid (EDTA) 0.3～0.7%, NaOH2～4%; Wherein, described per-cent is weight percentage.
Preferably, described auxiliary light-weight additive is a cenosphere.
Preferably, described high-strength cement is thick high-strength cement and/or thin and tall strong cement.
Low-temperature low-density well cementing cement mortar of the present invention is compared with the low temperature foam slurry, does not need specific installation to carry out cementing job, utilizes conventional cementing equipment to finish; Its thickening time is more easy to control, and operational procedure is more simple.
Embodiment
Embodiment 1 1.70g/cm
3Grout
At first prepare fluid loss agent, according to deionized water 1200g, NNDMAM (N,N-DMAA) 30.0g, AMPS (2 acrylamidos-2 methyl propane sulfonic acid) 264g, (NH4)
2S
2O
81.5g, EDTA (ethylenediamine tetraacetic acid (EDTA)) 7.5g, NaOH60.0g take by weighing each component.Preparation process is as follows: deionized water is poured in the 2000ml beaker, again with NNDMAM, AMPS, (NH
4)
2S
2O
8, EDTA is added in the water successively; Logical then N
220～40 minutes, be heated to 60 ℃ and begin reaction, stop heating when being heated to 90 ℃, control reaction temperature is lower than 90 ℃, and insulation is 2 hours between 70～85 ℃, and discharging adds solid NaOH again and adjusts PH for neutral, and product colour presents faint yellow.It contains about about 20～30% admittedly prepared polymkeric substance.
Secondly, preparation grout: measure water (in order to dispose conveniently with the grout jar, also can select seawater) 280g, be placed on and add setting accelerator 2.0g, retardant 6.4g, stablizer 6g, fluid loss agent 42g, dispersion agent 1.8g on watt woods agitator while stirring successively, be made into mixing water; And then measure high-strength cement 280g and auxiliary light-weight additive 20g, and add while stirring in the mixing water behind the mixing, be made into grout.
Above-mentioned dispersion agent can be selected aldehyde-ketone condensate etc., setting accelerator can be selected inorganic salt, organic compound, the compound short early strong system etc. of coagulating, retardant can be selected xylogen carbohydrate, organic acid, carbohydrate derivative etc., and stablizer is a borax, and alleviating auxiliary is cenosphere.
The test result of present embodiment low-temperature low-density grout such as following table 1.
Table 1 density 1.70g/cm
3Grout
| Denseness and thickening time BC, min | Dehydration ml | Intensity MPa (24h) | |||||||||
| 20℃ | 27℃ | 35℃ | 25℃ | 3℃ | 28℃ | ||||||
| 30 | 70 | 100 | 30 | 70 | 100 | 30 | 70 | 100 | 80 | 19.20 | 23.70 |
| 200 | 206 | 210 | 114 | 116 | 119 | 64 | 68 | 71 | |||
As can be known from the above table, the low temperature intensity of grout is very high, 24h intensity, and 3 ℃ is 6.1MPa, 28 ℃ is 8.2MPa, is about 3 times of foam slurry.This grout not only has higher low temperature intensity, and cementing job do not need specific installation, and conventional cementing equipment can fulfil assignment; Its thickening time is more easy to control, and operational procedure is more simple.
Embodiment 2 1.40g/cm
3Grout
At first prepare fluid loss agent, according to water 1036g, NNDMAM (N,N-DMAA) 62.0g, AMPS (2 acrylamidos-2 methyl propane sulfonic acid) 392g, (NH4)
2S
2O
84.7g, EDTA (ethylenediamine tetraacetic acid (EDTA)) 11.0g, NaOH62.7g take by weighing each component, the preparation method according to embodiment 1 is prepared then.
Next, according to: thin and tall strong cement 360g, water 240g, setting accelerator 1g, retardant 6.4g, fluid loss agent 36g, dispersion agent 1g, stablizer 3.6g, auxiliary light-weight additive 70g take by weighing each component, and all the other embodiments are with embodiment 1.
The test result of the low-temperature low-density well cementing cement mortar of present embodiment such as following table 2.
Table 2 density 1.40g/cm
3Grout
| Denseness and thickening time BC, min | Dehydration ml | Intensity MPa (24h) | |||||||||
| 20℃ | 27℃ | 30℃ | 25℃ | 3℃ | 28℃ | ||||||
| 30 | 70 | 100 | 30 | 70 | 100 | 30 | 70 | 100 | 52 | 15.6 | 18.6 |
| 190 | 200 | 205 | 110 | 113 | 119 | 60 | 66 | 69 | |||
Embodiment 3 1.30g/cm
3Grout
At first prepare fluid loss agent, according to water 1327g, NNDMAM (N,N-DMAA) 15.7g, AMPS (2 acrylamidos-2 methyl propane sulfonic acid) 188g, (NH4)
2S
2O
81.6g, EDTA (ethylenediamine tetraacetic acid (EDTA)) 4.7g, NaOH31.4g take by weighing each component, the preparation method according to embodiment 1 is prepared then.
Secondly, (50% thin, 50% thick according to thickness high-strength cement 300g, this ratio is weight percentage), water 240g, setting accelerator 1.2g, retardant 5.8g, fluid loss agent 36g, dispersion agent 0.9g, stablizer 3g, auxiliary light-weight additive 100g take by weighing each component, all the other embodiments are with embodiment 1.
The test result of the low-temperature low-density well cementing cement mortar of present embodiment such as following table 3.
Table 3 density 1.30g/cm
3Grout
| Denseness and thickening time BC, min | Dehydration ml | Intensity MPa (24h) | |||||||||
| 20℃ | 27℃ | 35℃ | 25℃ | 3℃ | 28℃ | ||||||
| 30 | 70 | 100 | 30 | 70 | 100 | 30 | 70 | 100 | 80 | 10.1 | 15.3 |
| 181 | 190 | 199 | 106 | 108 | 110 | 64 | 66 | 67 | |||
Embodiment 4 1.20g/cm
3Grout
At first prepare fluid loss agent, according to water 1254g, NNDMAM (N,N-DMAA) 32g, AMPS (2 acrylamidos-2 methyl propane sulfonic acid) 222g, (NH4)
2S
2O
83.1g, EDTA (ethylenediamine tetraacetic acid (EDTA)) 6.0g, NaOH50.5g take by weighing each component, the preparation method according to embodiment 1 is prepared then.
Next, according to: thin and tall strong cement 270g, water 240g, setting accelerator 1.3g, retardant 5.2g, fluid loss agent 36g, dispersion agent 1g, stablizer 2.7g, auxiliary light-weight additive 130g take by weighing each component, and all the other embodiments are with embodiment 1.
The test result of the low-temperature low-density well cementing cement mortar of present embodiment such as following table 4.
Table 4 density 1.20g/cm
3Grout
| Denseness and thickening time BC, min | Dehydration ml | Intensity MPa (24h) | |||||||||
| 20℃ | 27℃ | 30℃ | 25℃ | 3℃ | 28℃ | ||||||
| 30 | 70 | 100 | 30 | 70 | 100 | 30 | 70 | 100 | 88 | 8.3 | 10.0 |
| 171 | 178 | 185 | 110 | 112 | 115 | 62 | 67 | 69 | |||
Claims (4)
1 one kinds of low-temperature low-density well cementing cement mortars, it is characterized in that, comprise following component: high-strength cement 40.0～62.3%, water 29.1～35.0%, setting accelerator 0.1～0.6%, retardant 0.6～0.9%, fluid loss agent 4.4～5.2%, dispersion agent 0.1～0.3%, stablizer 0.1～0.3%, auxiliary light-weight additive 2～20%; Wherein, described per-cent is weight percentage.
2 low-temperature low-density well cementing cement mortars as claimed in claim 1 is characterized in that, described fluid loss agent comprises following component: water 66～84.6%, N,N-DMAA 1～4%, 2 acrylamido-2 methyl propane sulfonic acids 12～25%, (NH4)
2S
2O
80.1～0.3%, ethylenediamine tetraacetic acid (EDTA) 0.3～0.7%, NaOH2～4%; Wherein, described per-cent is weight percentage.
3 low-temperature low-density well cementing cement mortars as claimed in claim 1 is characterized in that, described auxiliary light-weight additive is a cenosphere.
4 low-temperature low-density well cementing cement mortars as claimed in claim 1 is characterized in that, described high-strength cement is thick high-strength cement and/or thin and tall strong cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101200293A CN100545123C (en) | 2007-08-07 | 2007-08-07 | Low-temperature low-density well cementing cement mortar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101200293A CN100545123C (en) | 2007-08-07 | 2007-08-07 | Low-temperature low-density well cementing cement mortar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101100361A true CN101100361A (en) | 2008-01-09 |
| CN100545123C CN100545123C (en) | 2009-09-30 |
Family
ID=39034846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101200293A Active CN100545123C (en) | 2007-08-07 | 2007-08-07 | Low-temperature low-density well cementing cement mortar |
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| CN (1) | CN100545123C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747880A (en) * | 2009-12-29 | 2010-06-23 | 中国石油天然气集团公司 | Deep-water low-temperature low-density early-strength cementing slurry for well cementation |
| CN101974317A (en) * | 2010-09-27 | 2011-02-16 | 中国海洋石油总公司 | Sulphoaluminate cement paste for deepwater cementing |
| CN102382633A (en) * | 2010-08-31 | 2012-03-21 | 中国海洋石油总公司 | Silicate grout for deep water |
| CN102504775A (en) * | 2011-10-12 | 2012-06-20 | 西南石油大学 | Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof |
| CN106630806A (en) * | 2017-01-06 | 2017-05-10 | 中国海洋石油总公司 | Cement mixed component and application thereof |
| CN107987813A (en) * | 2016-10-27 | 2018-05-04 | 中国石油化工股份有限公司 | A kind of Polymer-supported type coagulant and preparation method thereof and cement mortar |
| CN111499254A (en) * | 2020-04-17 | 2020-08-07 | 广东中林建筑园林工程有限公司 | Preparation method of coagulant for building engineering |
| CN111848013A (en) * | 2020-06-29 | 2020-10-30 | 尧柏特种水泥技术研发有限公司 | Special gas well cement slurry special for combustible ice exploitation |
| CN113429164A (en) * | 2021-06-17 | 2021-09-24 | 中国石油化工股份有限公司 | Low-density high-strength toughened cement slurry system for oil layer and preparation method thereof |
-
2007
- 2007-08-07 CN CNB2007101200293A patent/CN100545123C/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747880B (en) * | 2009-12-29 | 2013-12-04 | 中国石油天然气集团公司 | Deep-water low-temperature low-density early-strength cementing slurry for well cementation |
| CN101747880A (en) * | 2009-12-29 | 2010-06-23 | 中国石油天然气集团公司 | Deep-water low-temperature low-density early-strength cementing slurry for well cementation |
| CN102382633A (en) * | 2010-08-31 | 2012-03-21 | 中国海洋石油总公司 | Silicate grout for deep water |
| CN102382633B (en) * | 2010-08-31 | 2014-03-05 | 中国海洋石油总公司 | Silicate grout for deep water |
| CN101974317A (en) * | 2010-09-27 | 2011-02-16 | 中国海洋石油总公司 | Sulphoaluminate cement paste for deepwater cementing |
| CN102504775A (en) * | 2011-10-12 | 2012-06-20 | 西南石油大学 | Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof |
| CN107987813B (en) * | 2016-10-27 | 2020-08-11 | 中国石油化工股份有限公司 | Polymer supported coagulant, preparation method thereof and cement paste |
| CN107987813A (en) * | 2016-10-27 | 2018-05-04 | 中国石油化工股份有限公司 | A kind of Polymer-supported type coagulant and preparation method thereof and cement mortar |
| CN106630806A (en) * | 2017-01-06 | 2017-05-10 | 中国海洋石油总公司 | Cement mixed component and application thereof |
| CN106630806B (en) * | 2017-01-06 | 2019-04-26 | 中国海洋石油集团有限公司 | A kind of cement mixing component and its application |
| CN111499254A (en) * | 2020-04-17 | 2020-08-07 | 广东中林建筑园林工程有限公司 | Preparation method of coagulant for building engineering |
| CN111848013A (en) * | 2020-06-29 | 2020-10-30 | 尧柏特种水泥技术研发有限公司 | Special gas well cement slurry special for combustible ice exploitation |
| CN113429164A (en) * | 2021-06-17 | 2021-09-24 | 中国石油化工股份有限公司 | Low-density high-strength toughened cement slurry system for oil layer and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100545123C (en) | 2009-09-30 |
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Owner name: ZHONGHAI OIL FIELD SERVICE CO., LTD. COSL CHEMICAL Free format text: FORMER OWNER: ZHONGHAI OIL FIELD SERVICE CO., LTD. |
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Effective date of registration: 20110627 Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: CHINA OILFIELD SERVICES Ltd. Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Co-patentee after: COSL CHEMICALS (TIANJIN) Co.,Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: CHINA OILFIELD SERVICES Ltd. Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. |
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| 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 Ltd. Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Co-patentee after: COSL CHEMICALS (TIANJIN) Co.,Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CHINA OILFIELD SERVICES Ltd. Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. Co-patentee before: COSL CHEMICALS (TIANJIN) Co.,Ltd. |
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| 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 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Patentee after: CHINA OILFIELD SERVICES Ltd. Patentee after: Tianjin Yike Environmental Protection Technology Co.,Ltd. Address before: 100010 No. 25 North Main Street, Dongcheng District, Beijing, Chaoyangmen Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. Patentee before: CHINA OILFIELD SERVICES Ltd. Patentee before: COSL CHEMICALS (TIANJIN) Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |