Petrochina Company Limited

Shiyi Yuan

Jing Wang

Pingmei Wang

Jianhui Luo

Chunming Xiong

Demin Wang

Yuzhang Liu

Huaijiang Zhu

Fengluan Bai

Jingbo Yang

Chunde Liu

Ruoying Pu

Xinmin Song

Betaine surfactants of formula (I) and preparation methods and uses thereof are provided. The surfactant can decrease the interfacial surface tension of crude oil till 10mN/m, have the capabilities of antiheating (130&#xb0; C.), antimineralizing and antidiluting, and can be used in the field of tertiary oil recovery. 

Betaine surfactants and preparation methods and uses thereof

A braided comb-shaped salt-resistant thickening agent for tertiary oil extraction from class I oil reservoir is disclosed. The agent is polymerized with monomer (A) and monomer (B), and monomer (A) is one or multiple water soluble non-saturated compound(s) with alkenyl chain, while monomer (B) is at least one compound with the following formula: Monomer (A) is preferably acrylamide, ethenyl pyrrolidone, 2-acrylamide-2 methylpropane sulfonic acid, and acrylic acid or the mixture of the above said compounds, and in the formula of monomer (B), A is COOH, OH, SOH, Rand Rare H or C-Calkyl, Rand Rrepresent C-Calkyl, C-Calkylaryl, C-Calkyl ether or C-Calkyl ester group. This thickening agent has fine water solubility and good property to thicken water medium. The polymer's molecules present a braided comb-shaped structure in water solution with fine salt-resistant performances. The agent can be used together with the water extracted from oil mines to compound the polymer for tertiary oil extraction, and the polymer solution's viscosity can reach the level of the comb-shaped salt-resistant polymer solution applied in class I oil reservoir, so it can promote the economic benefits of tertiary oil extraction from class II oil reservoir and expand the application scope.

Braided comb-shaped salt-resistant polymer thickening agent

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Beijing, China

Shiyi Yuan