Petrochina Company Limited

Xiangfei Geng

Bin Ding

Pingmei Wang

Baoliang Peng

Jianhui Luo

Bo Huang

Lipeng He

Jianyong Xie

Yang Gao

Ying Wang

Yang Shi

Runwei Wang

Zongtao Zhang

Jin Zhang

Jie Yang

Bo Jiang

Chunming Xiong

Baoshan Guan

Yongge Wei

Jingfeng Dong

Falin Wei

Jianhui Lou

Jiangwei Zhang

Zheyu Wei

Yuanyang Li

Yongcan Peng

Jingjun Pan

Baocheng Wu

Youguo Yan

A permeability-enhancing flooding system for tight oil reservoirs and preparation and use thereof are disclosed. The permeability-enhancing flooding system is present in a state of oil-in-water droplet and composed of a surfactant, an oil-soluble substance and water, and has an outer phase that is an aqueous solution containing the surfactant, and an inner phase that is the oil-soluble substance; and the surfactant comprises one of nonionic gemini surfactants and anionic gemini surfactants, or a combination of two or more thereof. The preparation process for the permeability-enhancing flooding system is simple to operate, suitable for industrialized production, and low in overall cost, and has obvious application prospects in the field of tight oil reservoirs for an enhanced oil recovery.

Permeability-enhancing flooding system for tight oil reservoirs, and preparation and use thereof

The present invention discloses a N,N,N',N&#x2032;-tetradodecyl-substituted diphenyl ether sulfonate anionic Gemini surfactant and the synthesis method thereof. It has a structural formula of: 

N,N,N',N&#x2032;-tetradodecyl-substituted diphenyl ether sulfonate anionic Gemini surfactant and synthesis method thereof

A nonionic Gemini surfactant, (octylphenol polyoxyethylene ether disubstituted) dicarboxylic acid diphenyl ether has a structural formula of: and is prepared by a two-step reaction: S1, diphenyl ether 4,4'-dicarboxylic acid is subjected to an acyl chlorination reaction to obtain diphenyl ether 4,4&#x2032;-dicarbonyl dichloride; S2, diphenyl ether 4,4&#x2032;-dicarbonyl dichloride is subjected to an esterification reaction with octylphenol polyoxyethylene ether (OP-10) to obtain the target product (octylphenol polyoxyethylene ether disubstituted) dicarboxylic acid diphenyl ether. The surfactant is expected to be applied in tertiary oil recovery as an alkali/surfactant, in polymer/surfactant binary composite flooding, in alkali/surfactant/polymer ternary composite flooding, as a microemulsion emulsifier and the like, and it can also be compounded with a common surfactant to reduce the use cost, and thus create conditions for its large-scale application.

Nonionic Gemini surfactant of (octylphenol polyoxyethylene ether disubstituted) dicarboxylic acid diphenyl ether and its synthesis method

The invention discloses a core-shell structured anionic nano microemulsion system, and preparation and application thereof. The system comprises an anionic Gemini surfactant, an oil phase material, a solubilizer and water; wherein the microemulsion has a core-shell structure, with the outer shell being an anionic Gemini surfactant, and the inner core being an oil phase material. The anionic Gemini surfactant is N,N,N',N&#x2032;-dodecyl tetrasubstituted diphenyl ether sulfonate having the structural formula:  The anionic nano-microemulsion system of the present invention is homogeneous and transparent, has a spherical core-shell structure, has a nanometer size (3 to 40 nm) as droplets, has a narrow particle size distribution, is not easy to agglomerate, has good stability, and has an ultra-low interfacial tension and a capability of reducing viscosity of crude oil.

Core-shell structured anionic nano microemulsion system, and preparation and application thereof

The invention discloses a core-shell structured non-ionic nanoemulsion system and the preparation and use thereof. The system comprises a non-ionic gemini surfactant, an oil phase material, a solubilizer, and water; wherein the microemulsion has a core-shell structure, with the outer shell being the non-ionic Gemini surfactant, and the inner core being the oil phase material. The non-ionic Gemini surfactant is di(octylphenol polyoxyethylene ether)-substituted dicarboxylic acid diphenyl ether having the structural formula:  The non-ionic nanoemulsion system of the present invention is homogeneous and transparent, and has a spherical core-shell structure with nanometer-sized (3-40 nm) droplets, narrow particle size distribution, low tendency to agglomerate, good stability, and both an ultra-low interfacial tension and the ability to reduce viscosity of crude oil.

Core-shell structured non-ionic nanoemulsion system and preparation and use thereof

The present invention provides an amphiphilic molecular sieve containing a hydrophilic group on the outside and a lipophilic group on the inside and a production method thereof. The production method comprises: dispersing the ZSM-5 spherical nano-molecular sieve into toluene, adding thereto an organosilane containing a hydrophilic group and reacting at 40-80&#xb0; C. for 2-16 h, to obtain a molecular sieve containing a hydrophilic group; placing the molecular sieve containing a hydrophilic group in an aqueous solution of sodium hydroxide and reacting at 50-90&#xb0; C. for 10-50 min, to obtain a molecular sieve containing a hydrophilic group on the outside; dispersing the molecular sieve containing a hydrophilic group on the outside into toluene, adding thereto an organosilane containing a lipophilic group and reacting at 40-80&#xb0; C. for 2-12 h, to obtain the amphiphilic molecular sieve containing a hydrophilic group on the outside and a lipophilic group on the inside. The present invention also provides an amphiphilic molecular sieve obtained by the above production method, which contains a hydrophilic group on the outside and a lipophilic group on the inside.

Amphiphilic molecular sieve containing hydrophilic group on the outside and lipophilic group on the inside and production method threof

The present disclosure provides a single-side modified &#x3b2;-Anderson-type heteropolymolybdate organic derivative having an anionic moiety with a general formula represented by: &#x3b2;-{[RC(CHO)]M(OH)MoO}; &#x3b2; represents a non-planar folded structure; R=substituted or unsubstituted phenyl, CHX (n is an integer from 0 to 22; X&#x2550;H, OH, NH(CH)SOH, NHCHCOOH, NH, or NO); M=Cr. The single-side modified &#x3b2;-Anderson-type heteropolymolybdate organic derivative can be prepared under hydrothermal conditions.

Single-side modified &#x3b2;-Anderson-type heteropolymolybdate organic derivatives

The present invention provides a nano-silica dispersion having amphiphilic properties and a double-particle structure and its production method. The production method comprises: producing a lipophilically modified nano-silica alcosol which is denoted as a first reaction solution by adding a silane coupling agent containing a lipophilic group to a nano-silica alcosol as a raw material; producing a hydrophilically modified nano-silica alcosol which is denoted as a second reaction solution by adding a silane coupling agent containing a hydrophilic group into a nano-silica alcosol as a raw material; producing the nano-silica dispersion having amphiphilic properties and a double-particle structure by adding 3-aminopropyltriethoxysilane to the first reaction solution, stirring, then mixing the resultant with the second reaction solution. The present invention further provides a nano-silica dispersion having amphiphilic properties and a double-particle structure produced by the above production method. It has both hydrophilic and lipophilic properties, and has the double-particle structure, with a particle size of less than 100 nm. The production process is simple and low in cost.

Nano-silica dispersion having amphiphilic properties and a double-particle structure and its production method

The present invention provides an amphiphilic molecular sieve containing a lipophilic group on the outside and a hydrophilic group on the inside and a production method thereof. The production method comprises: dispersing the nano-ZSM-5 molecular sieve into toluene, adding an organosilane containing a lipophilic group and reacting at 60-100&#xb0; C. for 4-16 h, to obtain a molecular sieve containing a lipophilic group; placing the molecular sieve containing a lipophilic group in a mixed solution of sodium hydroxide solution and ethanol and reacting at 60-95&#xb0; C. for 20-60 min, to obtain a molecular sieve containing a lipophilic group on the outside; dispersing the molecular sieve containing a lipophilic group on the outside into toluene, adding an organosilane containing a hydrophilic group and reacting at 60-100&#xb0; C. for 4-16 h, to obtain the amphiphilic molecular sieve containing a lipophilic group on the outside and a hydrophilic group on the inside. The present invention also provides a molecular sieve obtained by the above production method, which does not destroy the characteristics of the original molecular sieve and has hydrophilic and lipophilic amphiphilic properties.

Amphiphilic molecular sieve containing lipophilic group on the outside and hydrophilic group on the inside and production method thereof

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Beijing, China

Xiangfei Geng