摘要
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 de-pletion. 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 de-cline. 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 flood-ing 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.
出处
《石油实验地质》
CAS
CSCD
北大核心
2014年第1期102-105,共4页
Petroleum Geology & Experiment
基金
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
关键词
深层高压低渗油藏
CO2混相驱
最小混相压力
中原油田
deep-buried high-pressure low-permeability reservoir
CO2 miscible flooding
minimum miscible pressure
Zhongyuan Oilfield
