二氧化碳助排在新沟嘴组油藏中的应用

Application of Carbon Dioxide-aided Flowback in the Reservoir of Xingouzi Formation

针对江汉油区特低渗油藏地层能量下降大,地层亏空严重,在实施酸化、压裂等大型措施后残液难以返排的难题,进行了二氧化碳前置助排技术研究。在酸化或压裂前注入液态的二氧化碳,利用混相与溶解气作用,达到补充地层能量和提高措施后返排效果的目的。通过理论研究,选择一批油井进行现场试验,优化二氧化碳前置助排的施工方案和选井条件,为该技术的进一步应用提供参考。

Aiming at problems of big formation energy degradation, severe formation deficit and difficult flowback of residual liquid after measures such as acidification and fracturing, the technology of carbon dioxide-aided flowback is studied. Carbon dioxide liquid is injected before acidizing or fracturing to complement formation energy and improve flowback effect after measures. on the basis of theoretical research, some wells are selected to carry out field test and construction plan and well selection conditions are optimized for carbon dioxide-aided flowback technology, providing the reference for its further application.