西安石油大学学报（自然科学版）2024，Vol.39Issue(4)：41-47,7.DOI:10.3969/j.issn.1673-064X.2024.04.006
稠化剂提高低渗油藏CO2驱油效果适应性评价
Adaptability Evaluation of Using Thickener to Improve CO2 Flooding Effect in Low-permeability Reservoirs
摘要
Abstract
During CO2 flooding,viscous fingering is prone to occur,which severely limits the effectiveness of CO2 flooding.To address this issue,an experiment for evaluating the viscosity increasing performance of a linear block copolymer thickener on CO2 and its control effect on CO2 channeling of heterogeneous cores was carried out.A quantitative method was established to evaluate the control and regu-lation effect of the thickener on CO2 viscosity and core heterogeneity,the mechanism of the thickener improving CO2 oil displacement ef-ficiency was analyzed,and the effect of the thickener increasing CO2 oil displacement efficiency in low permeability reservoirs is simula-ted using a three-dimensional radial flow model.The experimental results show that,under reservoir conditions,the thickening agent can increase the viscosity of CO2 by 18 times;Injecting thickening agent-CO2 system 1.0 PV into two types of low permeability heterogene-ous cores with the permeability difference of 5 and 10,and then performing CO2 flooding,can increase the CO2 flooding efficiency of the cores by 13.75 and 11.98 percentage points,respectively;The main mechanism of the thickener improving CO2 flooding efficiency in low permeability reservoirs is to increase CO2 viscosity,which contributes 79.6％and 72.5％to improving the oil displacement effi-ciency of two types of heterogeneous cores,respectively;The method of using thickeners to improve CO2 flooding efficiency has good a-daptability to low permeability reservoirs.关键词
二氧化碳驱/稠化剂/黏性指进/非均质性/低渗油藏/适应性Key words
carbon dioxide flooding/thickener/viscous fingering/heterogeneity/low permeability reservoir/adaptability分类
能源科技引用本文复制引用
闫飞,杨红,吴佼佼,于茜,姚振杰,梁全胜..稠化剂提高低渗油藏CO2驱油效果适应性评价[J].西安石油大学学报（自然科学版）,2024,39(4):41-47,7.基金项目
国家重点研发计划项目"二氧化碳提高油藏采收率与地质封存一体化关键技术及应用示范"(2022YFE0206700) （2022YFE0206700）
陕西省青年科技新星项目"促进CO2与原油混相的伴生气体系构筑及其改善CO2驱油效果评价"(2021KJXX-86) （2021KJXX-86）
