顶部注气稳定重力驱技术有效应用探讨

顶部注气稳定重力驱是所有注气非混相驱中提高采收率幅度最高的最新开发方式，对影响顶部注气稳定重力驱关键因素及应用到国内油田现场需考虑的因素进行了重点研究。研究认为，气油界面稳定性是顶部注气稳定重力驱实施成功与否的关键，地质因素的地层倾角、储层非均质性（韵律性、隔夹层、高角度裂缝等）和开发因素的临界注气速度、区域注采比是影响气油界面稳定性的关键因素；通过量化由于特殊的生产工作方式造成的初期产量阶段损失，为油田现场选择最佳实施顶部注气稳定重力驱时机提供可靠依据，并以中国西部某油藏为例，提出“注采兼顾、分区控压限产”的注气采油新开发技术政策，为国内其他类似油藏实施顶部注气稳定重力驱技术提供抛砖引玉的作用。

Investigation on Effect Application of the Technology of Crestal Gas Injection for Stable Gravity Flooding

The technology of crestal gas injection for stable gravity flooding can get highest EOR among all non-miscible gas injection technologies. Focused on major factors influencing crestal gas injection for stable gravity flooding and factors to be considered for the application to domestic reservoir，studies suggest that stability of gas-oil interface is the key to the success of implementing the technology of crestal gas injection for stable gravity flooding，and that the geological factor（angle of bedding、reservoir heterogeneity）and development factors（critical gas injection rate、regional injection-production ratio）are the key factors that affect the stability of gas-oil interface. Through quantifying the production loss caused by the special work pattern of the initial production phase，we hope to provide reliable reference for choosing the best moment of implementing the technology for oil-field. Taking a reservoir in western China for an example，we bring forward a new thought-“taking both injection and production into consideration，controlling drawdown pressure and limiting production”，offering the strategy of reference for the implementing of the technology in other similar reservoir.