深层高压低渗油藏CO驱室内实验研究——以中原油田胡96块为例

Laboratory experiments of CO flooding in deep-buried high-pressure low-permeability reservoirs：A case study of block Hu96 in Zhongyuan Oilfield

国殿斌 徐怀民

Guo Dianbin Xu Huaimin

中国石油大学(北京) 地球科学学院, 北京 102249 2. 中国石化 中原油田分公司 勘探开发科学研究院, 河南 濮阳 457001

College of Geosciences, China University of Petroleum, Beijing 102249, China 2. Research Institute of Petroleum Exploration & Production, SINOPEC Zhongyuan Oilfield Company, Puyang, Henan 457001, China

深层高压低渗油藏衰竭开发后存在气液两相流，开展CO2混相驱渗流特征复杂，需要进行深入研究。模拟深层高压低渗油藏环境，应用细管、长岩心实验开展了CO2驱室内实验研究。研究表明，该类油藏衰竭开发后，地层呈现双相流，CO2驱最小混相压力呈下降趋势，CO2驱油效果大幅下降，但注气恢复压力后开发可达到在原始地层条件下连续注CO2的驱油效果。研究成果有效指导了现场应用，中原胡96块深层高压低渗油藏CO2驱先导试验取得良好效果，为有效动用深层高压低渗油藏提供了技术支持。

Gas and liquid flows coexist in deep-buried high-pressure low-permeability reservoirs after natural depletion. Further studies are demanded due to the complicated characteristics of CO2 miscible flooding. The environment of deep-buried high-pressure low-permeability reservoir was simulated and the laboratory experiment of CO2 flooding was carried out using slim tube and long core. It has been concluded that after natural depletion, gas and liquid flows coexist in formation. The minimum miscible pressure (MMP) and the effect of CO2 flooding decline. But after restoring formation pressure, the effect of CO2 flooding increases, and achieves the similar result to that by continuous CO2 injecting under original formation pressure. The conclusion has been applied in CO2 flooding pilot test of deep-buried high-pressure low-permeability reservoirs in block Hu96 in the Zhongyuan Oilfield, providing technical support for the development of deep-buried high-pressure low-permeability reservoirs.

国家高技术研究发展计划（863）项目“二氧化碳提高石油采收率与封存关键技术研究”（2009AA063406）资助。

https://doi.org/10.11781/sysydz201401102