文献类型：期刊文献

英文题名：Oil recovery and asphaltene deposition characteristics in low-permeability reservoirs under different CO2 injection methods

作者：Pi, YanFu[1]; Li, ZhiHao[1]; Liu, Li[1]; Xu, Jun[2]; Wang, DaCheng[3]; Cai, DongRui[1]; Yang, JiaWen[1]

机构：[1] Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education, Northeast Petroleum University, Daqing, China; [2] School of Chemical Engineering, East China University of Science and Technology, Shanghai, China; [3] College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, China

年份：2025

外文期刊名：Journal of Dispersion Science and Technology

收录：EI(收录号：20250217656727)

语种：英文

外文关键词：Asphaltenes - Crude oil - Deposition rates - Fracture mechanics - Oil field development - Oil well flooding - Petroleum reservoir evaluation

摘要：Asphaltene deposition and permeability damage due to CO2 injection pose significant challenges to the development of low-permeability reservoirs. This study conducted CO2-crude oil phase equilibrium tests and performed CO2 flooding and CO2 huff and puff experiments using long cores to analyse the recovery and asphaltene deposition characteristics of low-permeability reservoirs under different CO2 injection methods. The findings reveal that the recovery of CO2 flooding experiments at 8 MPa (immiscible), 16 MPa (miscible), and 24 MPa (miscible) representing improvements of 10.83% (±0.6%), 20.98% (±0.84%), and 22.5% (±1.05%) compared to CO2 huff and puff. The dynamic deposition rates of asphaltene after CO2 flooding mark decreases of 27.74% (±1.48%), 15.3% (±1.38%), and 13.6% (±1.26%) compared to CO2 huff and puff. However, the permeability damage rates of cores after CO2 flooding were 9.31% (±1.33%), 15.22% (±1.95%), and 19.44% (±1.38%) higher than those of CO2 huff and puff, respectively, and asphaltene deposits were more uniformly distributed in the long core after CO2 flooding. In addition, this study found that the asphaltene plugging, accounting for over 75% of the permeability damage after CO2 flooding, was the primary mechanism. In contrast, both asphaltene plugging and deposition contributed to permeability damage after CO2 huff and puff, with plugging being more prominent near the injection end after CO2 huff and puff, gradually decreasing along the direction of CO2 injection. Therefore, asphaltene plugging is the primary mechanism causing permeability damage in CO2 flooding, while both plugging and deposition play important roles in permeability damage after CO2 huff and puff. ? 2025 Taylor & Francis Group, LLC.