低渗透油藏超前注水合理时机理论研究

从油藏工程的角度,以低渗透-特低渗透油层物理实验结果为基础,描述了低渗透油藏弹塑性储层特征,推导了低渗透油藏产能表达式.从油藏物质守恒原理出发,建立了低渗透油藏水驱开发指标概算的方法,提出了一种低渗透油藏超前注水合理时机的计算方法,并从理论上进行了验证,研究了低渗透油藏超前注水合理时机与渗透率的关系.结果表明,低渗透油藏存在一个超前注水合理时机,且随着渗透率的增加,最佳超前注水时间缩短.研究结果对于低渗透、特低渗透油藏的超前注水开发,具有很好的指导意义.

RESEARCH ON THE OPTIMUM OCCASION OF ADVANCED WATER INJECTION IN LOW PERMEABILITY RESERVOIR

Based on the results of low permeability reservoir physical experiments, the character of elastic-plastic deformation in low permeability rock is described in this article. Also the expression of well production capacity of low permeability is constructed. Follow the theory of balance of substance in reservoir, this paper even establishes the budgetary estimate method to water drive development of low permeability reservoir. And put forward a way to calculate the optimum occasion of advanced water injection, which is validated in theory and applied to find out the relationship between the optimum occasion and the permeability. The research showes that there is an optimum occasion for advanced water injection and it decreases as the increase of permeability. This research may be useful in low permeability development.