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Study on Enhanced Oil Recovery by Using OCS Surfactant/polymer Binary System after Polymer Flooding

Guo Donghong Xin Haochuan Cui Xiaodong Xie Huizhuan (Oilfield Chemistry Department, Research Institute of Petroleum Exploration and Development, PetroChina,Beijing 100083)  
Displacement performance of OCS surfactant/polymer binary system was investigated for enhancing oil recovery in Shuanghe Oilfield after polymer flooding. The experimental results showed that OCS surfactant/polymer binary system was a high efficiency oil displacement agent and it could improve oil recovery further after polymer flooding. The oil displacement experiment of OCS surfactant/polymer binary system combination with cross - linked polymer afetr polymer flooding showed that higher oil recovery would be achieved if cross - linked polymer was used for profile control and then OCS surfactant/polymer binary system was injected.
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