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

机构：[1] PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China; [2] School of Materials and Energy Engineering, Guizhou Key Laboratory for Preparation of Light Metal Materials, Guizhou Institute of Technology, Guiyang, 550003, China; [3] Nanjing University of Science and Technology, Nanjing, 210094, China

第一机构：PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220362250)

语种：英文

外文关键词：Contact angle - Fracture - Low permeability reservoirs - Nonionic surfactants - Nuclear magnetic resonance spectroscopy - Petroleum reservoir engineering

摘要：Based on the "Fracturing-Driving integration", experiments of fracturing oil displacement agent screening and imbibition experiment were carried out. With the conditions of ultra-low permeability reservoir in block Y of Changqing Oilfield, the mechanism of driving remaining oil and EOR of fracturing displacement agent system in ultra-low permeability reservoir was studied with a microfluidic model and imbibition NMR experiment. A system of oil displacement agents was obtained by mixing heavy alkyl benzene sulfonate surfactant, nonionic surfactant, and a betaine-type amphoteric surfactant. HAS-6C, HAS-5E, and HAS-5G were selected for their interfacial tension reached 10-3mN/m. Interfacial tension of HAS-5E was the lowest, which can be reduced to 10-4mN/m. HAS-6C had the most power of altering wettability, it could make contact angle go down to 64.5°. A system of oil displacement agents with low interfacial tension reduced the resistance of driving the remaining oil. HAS-5E drove oil clusters the most, it made saturation of oil clusters reduced by 45%. HAS-6C drove throat oil the most, it made saturation of throat oil reduced by 10.8%. Fracture oil displacement agent worked greatly in the process of injection and imbibition, it raised the range of EOR with low interfacial tension, altering wettability and the imbibition. ? 2022, The Authors. All rights reserved.