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Experimental Study on the Screening of Compound Oil Displacement System Comprising Alkali,Surfactants and Polymer

Zhou Yaping Yu Tao Liu Jialin Guo Linan Guo Dongmei(Research Institute of Oil Exploration and Development,Liaohe Oilfield Company of PetroChina,Panjin 124010)  
In view of the reservoir features and the oil properties of the certain block of Liaohe Oilfield,the experiments were carried out on compound oil displacement system/oil interfacial activity and thickening ability,the former comprised anionic surfactant heavy alkylbenzene sulfonate,nonionic surfactant polyoxyethylene nonyl phenyl ether,sodium carbonate and hydrophobic polymer.Orthogonal experiment method was used to design the project.By direct and indirect comparison,calculation and analysis,the optimal formula was determined as follows:the mass fraction of anionic surfactant,nonionic surfactant,sodium carbonate,and hydrophobic polymer 0.1%-0.125%,0.15%,1.6%-1.8%,and 0.12% respectively.The oil displacement system has higher interfacial activity and better long term thermal stability,and it also could solve the problems of salting out of the anionic surfactant and heavy loss of nonionic surfactant due to absorption,high content of alkali needed,and poor solubility.It could also broaden the content range of the surfactant and alkali in the oil displacement system.The new compound oil displacement system selected had better compatibility.
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