文献类型：期刊文献

英文题名：EOR mechanism of fracture oil displacement agent for ultra-low permeability reservoir

作者：Cong, Sunan Li, Jierui Liu, Weidong Shi, Yu Li, Yalong Zheng, Kai Luo, Xun Luo, Wenbo

第一作者：Cong, Sunan

通信作者：Li, JR[1];Zheng, K[1];Li, YL[2]

机构：[1]PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China;[2]Guizhou Inst Technol, Sch Mat & Energy Engn, Guizhou Key Lab Preparat Light Met Mat, Guiyang 550003, Peoples R China;[3]Nanjing Univ Sci & Technol, Nanjing 210094, Peoples R China

第一机构：PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat & Energy Engn, Guizhou Key Lab Preparat Light Met Mat, Guiyang 550003, Peoples R China;corresponding author), Nanjing Univ Sci & Technol, Nanjing 210094, Peoples R China.|贵州理工学院;

年份：2023

卷号：9

起止页码：4893-4904

外文期刊名：ENERGY REPORTS

收录：;EI(收录号：20231613896816);Scopus(收录号：2-s2.0-85152492646);WOS:【SCI-EXPANDED(收录号:WOS:000988719800001)】；

基金：This work was kindly supported by the Guizhou Province Science and Technology Planning Project, P. R. China (No. [2020] 1Y220) , the Youth Science and Technology Talent Growth Project of the Education Department of Guizhou Province, P. R. China (No. [2021] 264) , the Youth Science and Technology Talent Growth Project of Education Department of Guizhou Province, P. R. China (No. [2022] 352) , the Research Project for High-level Talents of Guizhou Institute of Technology.

语种：英文

外文关键词：Ultra -low permeability reservoir; Interfacial tension; Wettability; Fracture oil displacement agent; Driving remaining oil

摘要：Due to the low permeability, small pore throat, and poor pore connectivity of ultra-low permeability reservoirs, fracturing was required to improve the flow environment of oil in the reservoir during its development. The combination of fracturing and oil displacement could reduce the complexity of the development of ultra-low permeability reservoirs. It was feasible to synthesize new surfactants to prepare fracturing oil displacement agents, but the research and development of new surfactants were difficult and costly. This paper aimed to experimentally investigate the imbibition displacement mechanism of fracturing flooding by combining the surfactant of chemical flooding with the fracturing fluid. With the conditions of the ultra-low permeability reservoir in block Y of Changqing Oilfield, the mechanism of remaining oil start-up and fractured oil displacement agent enhanced oil recovery in the ultra-low permeability reservoir was studied by microfluidic model experiment and NMR experiment. A mixture of fracture oil displacement agents was obtained by mixing heavy alkyl benzene sulfonate surfactant, a nonionic surfactant, and a betaine-type amphoteric surfactant. HAS-6C, HAS-5E, and HAS -5G were selected for their interfacial tension reaching 10-3 mN/m. Oil-water interfacial tension of HAS-5E was the lowest, which can be reduced to 10-4 mN/m. The ability to alter the wettability of HAS-6C was the most significant, which could make the contact angle go down to 64.5 degrees. The multi-round dynamic and static imbibition experiments showed that the combination of selected surfactant and slickwater can greatly improve the imbibition recovery, of which HAS-6C could enhance oil recovery by 17%. The HAS-5E system with the lowest interfacial tension had the best effect of starting clustered residual oil, and the clustered residual oil saturation was reduced by 48.8%. The HAS-6C system with stronger wettability had the best effect of starting throat-like residual oil, and the throat-like residual saturation was reduced by 10.8%.(c) 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).