中低渗油藏开展聚/表二元复合驱可行性

Feasibility for Polymer/Surfactant Binary Compound Flooding System in Medium-low Permeability Reservoirs

随着石油开采的不断进行,我国可供开发的优质油藏越来越少,新增和未动用油藏中一大部分为中低渗油藏。相对优质油藏而言,中低渗油藏对驱油剂的要求更高。为了验证聚合物/表面活性剂二元复合体系在中低渗透油藏中的驱油可行性,本文选用不同类型的表面活性剂和聚合物作为筛选对象,从体系的粘度、与原油的界面张力和体系中分子流体力学半径与中低渗油藏的孔喉半径匹配度等几方面论证了聚表二元体系用于中低渗油藏具有可行性。最后通过驱油实验进行了验证。

As the oil production continues,there are fewer and fewer high quality reservoirs available for development in China,and the most of new or unused reservoirs are medium-low permeability reservoirs.Compared with high-quality reservoirs,medium-low permeability reservoirs have higher requirements for oil displacement agents.In order to verify the flooding feasibility of polymer/surfactant binary composite system in medium and low permeability reservoirs.In this paper,different types of surfactants and polymers were selected as screening objects,From the viscosity of the system,the interfacial tension with the crude oil,the matching degree between the radius of molecular fluid mechanics and the radius of pore throat in the system,they are proved that polymer/surfactant binary compound flooding system is feasible in the medium and low permeability reservoirs.Finally,it is verified by oil displacement experiment.