提高砂岩底水油藏原油采收率的新方法

针对砂岩底水油藏油井开采时,油层下部会形成方向近于垂直的压力梯度,使得底水向上运动的问题,设计出一种抑制底水运动,提高原油采收率的新方法——采水消锥法。利用油藏数值模拟技术,从机理上就其适用条件、范围、适用时机以及经济风险等方面做了较深入研究;并通过塔里木某一区块的实例剖析,认为此方法在砂岩底水油藏开发的中后期,对提高原油采收率有较好的经济效益,有一定的应用前景。

A New Improved Recovery Method for Complicated Sandstone Reservoir with Bottom Water

In sandstone bottom-water reservoir, accompanying with oil production, nearly-vertical pressure gradient will be generated at the lower position of oil-bearing formation and results in the bottom water moving upward. The author developed a new method of "producing water and eliminating conning",to restrain bottom-water movement and increase oil recovery. Using reservoir simulation technique studied its applicable conditions, applicable range, opportune moment and economic risk, etc., in terms of its mechanism. Through the analysis of a certain block of Tarim basin, it is recognized this method is more adaptable to middle-late period sandstone bottom-water reservoir development, and it will obtain good economic benefit for improved increase of crude oil recovery. It has bright future to be widely applied.