孔隙结构对低度交联体系微观驱油特征的影响  

Effect of pore structure on microscopic oil displacementcharacteristics of low-degree-crosslinking system

作　　者：薛国庆 于春生[2] 汤明光 付强 高浩 蒲万芬 XUE Guo-qing;YU Chun-sheng;TANG Ming-guang;FU Qiang;GAO Hao;PU Wan-fen(Hainan Branch of CNOOC Ltd.,Haikou 570100,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570100 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《应用化工》2022年第S02期32-35,40,共5页Applied Chemical Industry

基　　金：国家自然科学基金联合基金重点支持项目(U19B2010)。

摘　　要：以中国某水驱油藏为例,利用光刻微观物理模拟技术和微流控在线驱替技术,研究了微观孔隙结构对低度交联体系启动残余油效果的影响,分析了水驱后低度交联体系对残余油动启顺序和难易程度。研究结果表明,低度交联体系能够显著提高水驱后油藏的采收率,孔吼比相同时,配位数越大体系的驱油效果越好;低度交联体系驱主要启动了水驱后的簇状和孤岛残余油,随着孔吼比减小配位数增加,体系对这两类残余油的驱替效果越好;低度交联体系通过其流度控制作用和黏弹性驱油机理优先启动孔隙中的簇状、孤岛和盲端残余油,同时在启动簇状和孤岛残余油过程中可能会形成吸附残余油;该体系对孤岛、盲端和簇状残余油的驱替效率较高,对吸附和膜状残余油驱替效率较低,建议后期配合表面活性剂体系使用,进一步提高这两类残余油的驱替效率。Taking water flooding reservoir of Henan Shuanghe oilfield for instance,this paper studied the effect of micro-pore structure on residual oil mobilized by low-degree-crosslinking system(LDCS),and analyzed the mobilizing sequence and difficulty of residual oil by the LDCS after water flooding by applying lithography micro-physical simulation technology and microfluidic online flooding technology.The researching results showed that LDCS could significantly enhance oil recovery after water flooding.At the condition of the same pores and throat ratio,the oil displacement effect increased with the increasing of coordination number.LDCS displacement mainly mobilized cluster and island residual oil after water flooding.The LDCS flooding has a better displacing performance on these two residual oils as the pores and throat ratio reduced and the coordination number increased.Clumps,islands and blinds residual oil in the pore was preferentially mobilized through mobility controling effect and viscoelastic oil displacement mechanism of LDCS.At the same time,adsorpution residual oil might be formed during the mobilizing of clumps and islands residual oil.The LDCS has higher displacement efficiency for isolated,blind and cluster residual oil,but lower displacement efficiency for adsorption and membrane residual oil.Therefore,the study suggested that the surfactant system conbining with LDCS should be used to futher enhance displacing efficiency of adsorption and membrane residual oil in the later of LDCS flooding.

关 键 词：微观孔隙结构 低度交联体系 残余油 启动顺序 驱替效率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]