Imbibition mechanisms of high temperature resistant microemulsion system in ultra-low permeability and tight reservoirs

作     者：XIAO Lixiao HOU Jirui WEN Yuchen QU Ming WANG Weiju WU Weipeng LIANG Tuo XIAO Lixiao;HOU Jirui;WEN Yuchen;QU Ming;WANG Weiju;WU Weipeng;LIANG Tuo

作者机构：Unconventional Petroleum Science and Technology Research InstituteChina University of Petroleum(Beijing)Beijing 102249China Key Laboratory of Petroleum EngineeringEducation MinistryChina University of Petroleum(Beijing)Beijing 102249China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2022年第49卷第6期

页      面：1398-1410页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0708[理学-地球物理学] 082002[工学-油气田开发工程] 

基　　金：Supported by the National Natural Science Foundation of China(52174046) Innovation Foundation of China National Petroleum Corporation(2021DQ02-0202) Science Foundation of China University of Petroleum(Beijing)(2462020XKBH013). 

主　　题：ultra-low permeability reservoir tight oil microemulsion imbibition mechanism oil displacement efficiency EOR 

摘      要：Lower-phase microemulsions with core-shell structure were prepared by microemulsion dilution method.The high temperature resistant systems were screened and the performance evaluation experiments were conducted to clarify the spontaneous imbibition mechanisms in ultra-low permeability and tight oil reservoirs,and to direct the field microfracture huff and puff test of oil well.The microemulsion system(O-ME)with cationic-nonionic surfactant as hydrophilic shell,No.3 white oil as oil phase core has the highest imbibition recovery;its spontaneous imbibition mechanisms include:the ultra-low interfacial tension and wettability reversal significantly reduce oil adhesion work to improve oil displacement efficiency,the nanoscale“core-shell structureformed can easily enter micro-nano pores and throats to expand the swept volume,in addition,the remarkable effect of dispersing and solubilizing crude oil can improve the mobility of crude oil.Based on the experimental results,a microfracture huff and puff test of O-ME was carried out in Well YBD43-X506 of Shengli Oilfield.After being treated,the well had a significant increase of daily fluid production to 5 tons from 1.4 tons,and an increase of daily oil production to 2.7 tons from 1.0 ton before treatment.