CN1528853A - Cation dual surface active agent capable of using displacement agent - Google Patents
Cation dual surface active agent capable of using displacement agent Download PDFInfo
- Publication number
- CN1528853A CN1528853A CNA2003101107173A CN200310110717A CN1528853A CN 1528853 A CN1528853 A CN 1528853A CN A2003101107173 A CNA2003101107173 A CN A2003101107173A CN 200310110717 A CN200310110717 A CN 200310110717A CN 1528853 A CN1528853 A CN 1528853A
- Authority
- CN
- China
- Prior art keywords
- oil
- gemini surfactant
- agent
- cation gemini
- cation
- 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.)
- Pending
Links
Landscapes
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention refers to a kind of positive ion double surface activating agent in third petroleum production chemical oil-displacing agent, who is expressed by m-s-m, m represents the carbon atom quantity of activating agent alkyl radical, s represents the carbon atom of chain connection radical. S=2, 3, 4, 5, 6, m=10, 12, 14, 16, 18, the activating agent can be used singly, it also can be used with other surface activating agent. It needn't add in alkali, thus it is harmless to formation, it saves oil exploit cost, and it is stable, it has excellent property for decreasing the tension of oil/water interface, and overcomes that current oil-displacing agent induces the oil displacing efficiency falling because of the color spectrum detachment phenomenon.
Description
Technical field
The present invention relates to can be used as a kind of cation Gemini surfactant of tertiary oil recovery chemical oil displacement agent.
Background technology
The many oil fields of China enter development late stage successively, and the application of tertiary oil recovery technology is paid attention to widely.In the latter stage of waterflooding, irreducible oil be with the immobilized spherical distribution in the hole of reservoir rocks.Reducing interfacial tension is to force the irreducible oil mobile sole mode that is trapped in the porous medium, also is the effective ways that can increase substantially oilfield exploitation efficient.Oil-displacing agent must be reduced to 10 with oil water interfacial tension
-3The mN/m or the lower order of magnitude, otherwise will not have practical value.Because simple tensio-active agent is difficult to oil water interfacial tension is reduced to 10
-3Below the mN/m, therefore, the present tensio-active agent that uses in the chemical flooding, great majority add the compound of auxiliary agent such as alkaline agent for petroleum sodium sulfonate.Yet adding alkaline agent can make the pH value raise, make the expansion of clay mineral aggravate, water sensitivity strengthens, and the commutative high-valence cationic effect in sulfonated petro-leum and local water and the clay forms the sulfonate precipitation, fouling etc. in the stratum, thereby bigger injury is caused on the stratum, seriously influenced the sustainable exploitation of oil.And the consumption of sodium hydroxide also increased the cost of winning of oil generally all than higher, influenced the economic benefit of oil production.In addition, because compound is a mixture, when multi-component system flows in oil reservoir, chromatographic separation may take place between each composition of oil-displacing agent, thereby can destroy the integrity of original formulation system, therefore can make established ultra low interfacial tension disappear, so that oil displacement efficiency reduce.
Summary of the invention
The object of the present invention is to provide the cation Gemini surfactant that can be used as oil-displacing agent, it uses separately, need not add alkali, thereby the stratum there is not injury, and stable performance, have good reduction oil/water termination tensile ability, can guarantee that in the scope of broad crude oil/water has ultra low interfacial tension, and overcome the oil displacement efficiency decline that existing oil-displacing agent causes because of the chromatographic separation phenomenon.
For achieving the above object, the invention provides following technical scheme.
The present invention is a cationoid Gemini surface active agent, and m-s-m represents with code name, and wherein m represents the carbonatoms of tensio-active agent alkyl, and the s representative connects basic carbonatoms.Its structural formula is as follows:
s＝2，3，4，5，6????m＝10，12，14，16，18
Such tensio-active agent is a white solid, belongs to quaternary ammonium salt cationic surfactant, and solvability is fine in water.On the scientific and technical literature introduction of this tensio-active agent is arranged at home and abroad at present, but also do not have this surfactant product to sell at home and abroad.Therefore, preparation method's brief introduction of this class tensio-active agent is as follows, two kinds of methods are wherein arranged:
1) method A
2) method B
Annotate: wherein during s=2, method A is better
This reaction is raw materials used: a bromoalkane, and homemade, chemical pure, colourless liquid, commercially available; The tetramethyl-alkyl diamine, homemade, chemical pure, colourless liquid, commercially available; Alkyl dimethyl amine, homemade, industrial goods, colourless liquid, commercially available; α, ω-two bromoalkane, homemade, chemical pure, colourless liquid, commercially available.
As a kind of chemical oil displacement agent that is used for tertiary oil recovery, this cation Gemini surfactant connects basic carbonatoms and is respectively 2,3,4,5,6, and the alkyl carbon atoms number is respectively 10,12, and 14,16,18.This oil-displacing agent can reach ultra low interfacial tension with crude oil under the situation of exogenously added alkali not, this oil-displacing agent both can use separately, also can be composite with its homologue Gemini surface active agent, and its compound proportion is 0～100 quality %.
This oil-displacing agent can also be composite with cats product, and cats product can be a quaternary ammonium salt surface active agent, and its compound proportion is 10～90 quality %.
This oil-displacing agent can also be composite with nonionogenic tenside, nonionogenic tenside can be fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene, aliphatic acid polyethenoxy ether ester and polyhydric alcohol fatty acid ester Soxylat A 25-7, and its compound proportion is 10～90 quality %.
According to the situation of prescription provided by the present invention and formation crude oil, can be combined into the component of various ratios.Using method adopts the perfusion of common tertiary oil recovery, and the add-on of chemical agent is below 0.5% of the water yield.
Compared with prior art, effect of the present invention and benefit are:
(1) oil-displacing agent provided by the present invention can reach ultralow oil/water termination tension force in bigger concentration range when auxiliary agent such as exogenously added alkali does not use separately, thereby has avoided the injury of alkali to the stratum, helps the Sustainable development of oil production;
(2) the present invention much smaller than present oil-displacing agent consumption and do not need under the situation of auxiliary agents such as exogenously added alkali, just can reach ultralow oil water interfacial tension at consumption, has reduced displacement of reservoir oil cost widely;
(3) the present invention forms comparatively singlely, can overcome the chromatographic separation effect to a certain extent and the decline of the oil displacement efficiency that causes;
(4) oil-displacing agent of the present invention is a cationic surfactant, has avoided the commutative polyvalent ion in sulfonate surfactant and the stratum to form the injury of precipitation to the stratum.
Embodiment
Actual measurement condition 1:
1. testing tool: an interfacial tensimeter is dripped in the rotation of 500 types
2. temperature: 45 ℃
3. crude oil: experimental standard crude oil
4. water: local water
5. oil-displacing agent is formed: 16-3-16
Result such as following table:
| Oil-displacing agent concentration (w%) | Interfacial tension mN/m between crude oil/local water |
| ????0.0007 | ????45.4 |
| ????0.0058 | ????0.00868 |
| ????0.0311 | ????0.00977 |
| ????0.0492 | ????0.00912 |
| ????0.0998 | ????0.00088 |
| ????0.2000 | ????0.000018 |
| ????0.2960 | ????0.00041 |
| ????0.5908 | ????0.00591 |
Actual measurement condition 2:
1. testing tool: an interfacial tensimeter is dripped in the rotation of 500 types
2. temperature: 45 ℃
3. crude oil: experimental standard crude oil
4. water: local water
5. oil-displacing agent is formed: 12-2-12 (50%)+16-4-16 (50%)
Result such as following table:
| Oil-displacing agent concentration (w%) | Interfacial tension mN/m between crude oil/local water |
| ????0.001 | ????47.32 |
| ????0.005 | ????0.0120 |
| ????0.010 | ????0.0073 |
| ????0.050 | ????0.00232 |
| ????0.100 | ????0.00089 |
| ????0.200 | ????0.00026 |
| ????0.300 | ????0.00097 |
Actual measurement condition 3:
1. testing tool: an interfacial tensimeter is dripped in the rotation of 500 types
2. temperature: 45 ℃
3. crude oil: experimental standard crude oil
4. water: local water
5. oil-displacing agent is formed: main component (w%):
12-3-12????????????????25％
14-2-14????????????????25％
16-4-16????????????????25％
18-6-18????????????????25％
Result such as following table:
| Oil-displacing agent concentration (w%) | Interfacial tension mN/m between crude oil/local water |
| ????0.010 | ????0.0072 |
| ????0.030 | ????0.0041 |
| ????0.050 | ????0.0018 |
| ????0.100 | ????0.00095 |
| ????0.200 | ????0.00046 |
Actual measurement condition 4:
1. testing tool: an interfacial tensimeter is dripped in the rotation of 500 types
2. temperature: 45 ℃
3. crude oil: experimental standard crude oil
4. water: local water
5. oil-displacing agent is formed: main component (w%):
14-3-14?????????????????20％
16-3-16?????????????????20％
18-3-18?????????????????10％
Cetyl trimethylammonium bromide 50%
Result such as following table:
| Oil-displacing agent concentration (w%) | Interfacial tension mN/m between crude oil/local water |
| ????0.030 | ????0.0084 |
| ????0.050 | ????0.0045 |
| ????0.100 | ????0.0021 |
| ????0.200 | ????0.0015 |
| ????0.300 | ????0.0026 |
Actual measurement condition 5:
1. testing tool: an interfacial tensimeter is dripped in the rotation of 500 types
2. temperature: 45 ℃
3. crude oil: experimental standard crude oil
4. water: local water
5. oil-displacing agent is formed: main component (w%):
10-4-10????????????????10％
12-4-12????????????????20％
16-4-16????????????????20％
Polyoxyethylene nonylphenol ether 50%
Result such as following table:
| Oil-displacing agent concentration (w%) | Interfacial tension mN/m between crude oil/local water |
| ????0.030 | ????0.0091 |
| ????0.050 | ????0.0063 |
| ????0.100 | ????0.0052 |
| ????0.200 | ????0.0043 |
| ????0.300 | ????0.0057 |
By above actual measurement as can be seen, the present invention all has good reduction oil/water termination tensile ability under the extremely low chemical agent concentration and in the chemical agent concentration scope at broad.
Claims (6)
1. can be used as the cation Gemini surfactant of oil-displacing agent, its structure is as follows:
It is characterized in that described cation Gemini surfactant connects basic carbonatoms s and is respectively 2,3,4,5,6, alkyl carbon atoms number m respectively is 10,12,14,16,18.
2. cation Gemini surfactant according to claim 1, its feature are that also described cation Gemini surfactant and its homologue Gemini surface active agent are composite, and its compound proportion is 0～100 quality %.
3. cation Gemini surfactant according to claim 1 is characterized in that described cation Gemini surfactant and cats product are composite, and its compound proportion is 10～90 quality %.
4. cation Gemini surfactant according to claim 3 is characterized in that, described cats product is a quaternary ammonium salt surface active agent.
5. cation Gemini surfactant according to claim 1 is characterized in that described cation Gemini surfactant and nonionogenic tenside are composite, and its compound proportion is 10～90 quality %.
6. cation Gemini surfactant according to claim 5 is characterized in that, described nonionogenic tenside is fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene, aliphatic acid polyethenoxy ether ester and polyhydric alcohol fatty acid ester Soxylat A 25-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101107173A CN1528853A (en) | 2003-10-09 | 2003-10-09 | Cation dual surface active agent capable of using displacement agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101107173A CN1528853A (en) | 2003-10-09 | 2003-10-09 | Cation dual surface active agent capable of using displacement agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1528853A true CN1528853A (en) | 2004-09-15 |
Family
ID=34304699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101107173A Pending CN1528853A (en) | 2003-10-09 | 2003-10-09 | Cation dual surface active agent capable of using displacement agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1528853A (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363096C (en) * | 2005-12-02 | 2008-01-23 | 西南石油学院 | Novel gemini surfactants and its synthesis method |
| CN100400618C (en) * | 2006-05-24 | 2008-07-09 | 西南石油大学 | Oil well surrounding stratum hyphobic lipophilic treating additive and its preparing method |
| CN100425317C (en) * | 2005-04-12 | 2008-10-15 | 中国科学院化学研究所 | Demulsifier |
| CN101845295A (en) * | 2010-05-24 | 2010-09-29 | 湖北汉科新技术股份有限公司 | Drilling fluid tackifier favorable for protecting oil-gas layers |
| CN102309945A (en) * | 2010-07-05 | 2012-01-11 | 深圳市美凯特科技有限公司 | Multicomponent surface active agent and preparation method thereof |
| CN102319550A (en) * | 2011-07-08 | 2012-01-18 | 中国林业科学研究院林产化学工业研究所 | Low-concentration viscoelastic surfactant solution and preparation method thereof |
| CN102329608A (en) * | 2011-07-25 | 2012-01-25 | 天津科技大学 | Microemulsion for improving core wettability |
| CN101711959B (en) * | 2009-11-19 | 2012-02-01 | 蚌埠丰原医药科技发展有限公司 | Polymerizable ester-group Gemini cation gemini surfactant and preparation method thereof |
| CN102373044A (en) * | 2010-08-23 | 2012-03-14 | 中国石油化工股份有限公司 | Oil displacement method suitable for MgCl2 water-type oil displacement agent |
| CN101766973B (en) * | 2009-01-07 | 2012-06-13 | 湖北大学 | Symmetric cationic surfactant and preparation method thereof |
| CN102653685A (en) * | 2012-04-06 | 2012-09-05 | 西南石油大学 | Biquaternary ammonium salt type demulsifying agent for crude oil produced liquid and preparation method for demulsifying agent |
| CN102952566A (en) * | 2011-08-18 | 2013-03-06 | 中国石油化工股份有限公司 | Dehydration method of oilfield produced fluid |
| CN103173197A (en) * | 2013-03-05 | 2013-06-26 | 西北大学 | Gemini surfactant, preparation method thereof, and application thereof in tertiary oil recovery |
| CN104277818A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Drag reducer for fracturing fluid and application thereof |
| CN106350048A (en) * | 2016-07-22 | 2017-01-25 | 北京斯迪莱铂油气技术有限公司 | Oil washing agent for oil well fracturing as well as preparation method and application of oil washing agent |
| CN109111906A (en) * | 2018-09-19 | 2019-01-01 | 中国石油化工股份有限公司 | A kind of emulsifying and viscosity-reducing agent for condensed oil |
| CN109135709A (en) * | 2018-09-19 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of viscosity reduction oil displacement agent and oil displacement system suitable for heavy crude reservoir |
| CN109231232A (en) * | 2018-11-07 | 2019-01-18 | 太原理工大学 | Micro--meso-hole structure Beta molecular sieve, micro--mesoporous Beta molecular sieve catalyst of Ni base and preparation method thereof |
| CN112457834A (en) * | 2019-09-06 | 2021-03-09 | 中国石油天然气股份有限公司 | Gemini cationic surfactant and preparation method and application thereof |
| CN116589995A (en) * | 2022-12-28 | 2023-08-15 | 陕西邦达诺环保科技有限公司 | Multi-type-nonionic oil film stripping agent and preparation method thereof |
| CN117701267A (en) * | 2024-02-06 | 2024-03-15 | 新疆光亚油气新技术发展有限公司 | Pressure-reducing and injection-increasing surfactant system for low-permeability oil field and preparation method thereof |
-
2003
- 2003-10-09 CN CNA2003101107173A patent/CN1528853A/en active Pending
Cited By (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425317C (en) * | 2005-04-12 | 2008-10-15 | 中国科学院化学研究所 | Demulsifier |
| CN100363096C (en) * | 2005-12-02 | 2008-01-23 | 西南石油学院 | Novel gemini surfactants and its synthesis method |
| CN100400618C (en) * | 2006-05-24 | 2008-07-09 | 西南石油大学 | Oil well surrounding stratum hyphobic lipophilic treating additive and its preparing method |
| CN101766973B (en) * | 2009-01-07 | 2012-06-13 | 湖北大学 | Symmetric cationic surfactant and preparation method thereof |
| CN101711959B (en) * | 2009-11-19 | 2012-02-01 | 蚌埠丰原医药科技发展有限公司 | Polymerizable ester-group Gemini cation gemini surfactant and preparation method thereof |
| CN101845295A (en) * | 2010-05-24 | 2010-09-29 | 湖北汉科新技术股份有限公司 | Drilling fluid tackifier favorable for protecting oil-gas layers |
| CN101845295B (en) * | 2010-05-24 | 2013-01-09 | 湖北汉科新技术股份有限公司 | Drilling fluid tackifier favorable for protecting oil-gas layers |
| CN102309945A (en) * | 2010-07-05 | 2012-01-11 | 深圳市美凯特科技有限公司 | Multicomponent surface active agent and preparation method thereof |
| CN102309945B (en) * | 2010-07-05 | 2012-12-19 | 深圳市美凯特科技有限公司 | Multicomponent surface active agent and preparation method thereof |
| CN102373044A (en) * | 2010-08-23 | 2012-03-14 | 中国石油化工股份有限公司 | Oil displacement method suitable for MgCl2 water-type oil displacement agent |
| CN102373044B (en) * | 2010-08-23 | 2013-07-31 | 中国石油化工股份有限公司 | Oil displacement method suitable for MgCl2 water-type oil displacement agent |
| CN102319550B (en) * | 2011-07-08 | 2014-01-22 | 中国林业科学研究院林产化学工业研究所 | Low-concentration viscoelastic surfactant solution and preparation method thereof |
| CN102319550A (en) * | 2011-07-08 | 2012-01-18 | 中国林业科学研究院林产化学工业研究所 | Low-concentration viscoelastic surfactant solution and preparation method thereof |
| CN102329608B (en) * | 2011-07-25 | 2013-10-23 | 天津科技大学 | Microemulsion for improving core wettability |
| CN102329608A (en) * | 2011-07-25 | 2012-01-25 | 天津科技大学 | Microemulsion for improving core wettability |
| CN102952566A (en) * | 2011-08-18 | 2013-03-06 | 中国石油化工股份有限公司 | Dehydration method of oilfield produced fluid |
| CN102952566B (en) * | 2011-08-18 | 2014-12-31 | 中国石油化工股份有限公司 | Dehydration method of oilfield produced fluid |
| CN102653685A (en) * | 2012-04-06 | 2012-09-05 | 西南石油大学 | Biquaternary ammonium salt type demulsifying agent for crude oil produced liquid and preparation method for demulsifying agent |
| CN103173197B (en) * | 2013-03-05 | 2015-07-08 | 西北大学 | Gemini surfactant, preparation method thereof, and application thereof in tertiary oil recovery |
| CN103173197A (en) * | 2013-03-05 | 2013-06-26 | 西北大学 | Gemini surfactant, preparation method thereof, and application thereof in tertiary oil recovery |
| CN104277818A (en) * | 2013-07-09 | 2015-01-14 | 中国石油化工股份有限公司 | Drag reducer for fracturing fluid and application thereof |
| CN106350048B (en) * | 2016-07-22 | 2019-06-14 | 北京斯迪莱铂油气技术有限公司 | A kind of wellfracturing detergent and its preparation method and application |
| CN106350048A (en) * | 2016-07-22 | 2017-01-25 | 北京斯迪莱铂油气技术有限公司 | Oil washing agent for oil well fracturing as well as preparation method and application of oil washing agent |
| CN109111906A (en) * | 2018-09-19 | 2019-01-01 | 中国石油化工股份有限公司 | A kind of emulsifying and viscosity-reducing agent for condensed oil |
| CN109135709A (en) * | 2018-09-19 | 2019-01-04 | 中国石油化工股份有限公司 | A kind of viscosity reduction oil displacement agent and oil displacement system suitable for heavy crude reservoir |
| CN109111906B (en) * | 2018-09-19 | 2020-10-13 | 中国石油化工股份有限公司 | Thick oil emulsifying viscosity reducer |
| CN109135709B (en) * | 2018-09-19 | 2020-10-13 | 中国石油化工股份有限公司 | Viscosity-reducing oil displacement agent and oil displacement system suitable for heavy oil reservoir |
| CN109231232A (en) * | 2018-11-07 | 2019-01-18 | 太原理工大学 | Micro--meso-hole structure Beta molecular sieve, micro--mesoporous Beta molecular sieve catalyst of Ni base and preparation method thereof |
| CN112457834A (en) * | 2019-09-06 | 2021-03-09 | 中国石油天然气股份有限公司 | Gemini cationic surfactant and preparation method and application thereof |
| CN112457834B (en) * | 2019-09-06 | 2022-12-02 | 中国石油天然气股份有限公司 | Gemini cationic surfactant and preparation method and application thereof |
| CN116589995A (en) * | 2022-12-28 | 2023-08-15 | 陕西邦达诺环保科技有限公司 | Multi-type-nonionic oil film stripping agent and preparation method thereof |
| CN117701267A (en) * | 2024-02-06 | 2024-03-15 | 新疆光亚油气新技术发展有限公司 | Pressure-reducing and injection-increasing surfactant system for low-permeability oil field and preparation method thereof |
| CN117701267B (en) * | 2024-02-06 | 2024-05-14 | 新疆光亚油气新技术发展有限公司 | Pressure-reducing and injection-increasing surfactant system for low-permeability oil field and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1528853A (en) | Cation dual surface active agent capable of using displacement agent | |
| CN101029224A (en) | Use of bi-alkyl carboxylate surface activator in triple oil recovery | |
| CN1814692A (en) | Carboxyl-betaine and sulfosalt surfactant formula system and use in the third oil-production | |
| CN102977872B (en) | A kind of strengthening foam oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery and preparation method thereof | |
| CN102464598B (en) | Fatty acid amide polyoxylethylene ether benzene sulfonate and preparation method thereof | |
| CN101029225A (en) | Non-base oil-displacing agent composition of bi-alkyl carboxylate and its use | |
| CN109135709B (en) | Viscosity-reducing oil displacement agent and oil displacement system suitable for heavy oil reservoir | |
| CN106883833B (en) | Oil displacement system for ultrahigh-temperature high rigidity oil reservoir with high salt | |
| CN101298554A (en) | Surfactant for oil displacement, formula system thereof and use thereof in tertiary recovery of crude oil | |
| CN1807542A (en) | Temperature-resistant viscosity-reducing agent for boring fluid | |
| CN1760319A (en) | Cleanup additive in use for acidification in high temperature | |
| CN104449633B (en) | Crude oil surfactant and preparation method and application thereof | |
| CN1814691A (en) | Surfactant formula system compounded by ampho-surfactant and use in the third oil production | |
| CN1123619C (en) | Three-element built-up composition containing alkylphenylsulfonate surfactant and its application | |
| CN1131293C (en) | Oil-displacing surfactant system for increasing recovery ratio of crude | |
| CN101298553A (en) | Double-hydrophilic novel surfactant, formula system and use thereof | |
| CN1219017C (en) | Use of alkyl naphthalene sulfonate as oil displacement agent | |
| CN1241610A (en) | Chemical agent for intensified oil production | |
| CN1090314A (en) | High temperature emulsified wax-inhibitor for deep oil-well and compound method thereof | |
| CN1131292C (en) | Surfactant composition for increasing recovery ratio of crude and its application | |
| CN1233783C (en) | Novel crude oil drag reduction and viscosity reducing agent | |
| CN1285700C (en) | Method for preparing residue free fracturing fluid | |
| CN114763471A (en) | Slickwater fracturing fluid composition, slickwater fracturing fluid and application of slickwater fracturing fluid | |
| CN1123620C (en) | Three-element built-up composition containing lignosulfonate surfactant and its application in tertiary petroleum recovery | |
| CN1730144A (en) | Carboxylate surface active agent, its formula system and its application in tertiary oil extraction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |