整体压裂优化方案设计的理论模式

以胜利大芦湖油田樊128块油藏为例,以整个油藏(包括含在其中的水力裂缝)为研究单元,以整个油藏未来的开发、调整和压裂效果评价为着眼点,以地质与生产动静态资料为参数覆盖依据,并用模糊多因素决策方法为优选最佳缝长的评价方法,最终提出了一套新的整体压裂优化设计的概念和方法。该研究模式能综合考虑储层有效渗透率、有效厚度、目前地层压力以及油井含水率等多种因素的影响,因而能精细提供油藏在不同开发生产阶段进行水力压裂时的最佳缝长设置,从而改变了过去整体压裂方案过于笼统、抽象的缺点,以及在指导单井压裂设计时的针对性和有效性不强的局限性。经其他可靠手段验证,此研究结果可靠,且简单易行,便于现场应用。

THEORETICAL MODE OF OVERALL FRACTURING OPTIMIZATION PLAN

A new concept and method of overall hydraulic fracturing optimization is put forward in the paper taking the reservoir of Fan 128 located in Shengli Daluhu Oilfield as a field case.In this study,the integral reservoir which contains hydraulic fractures is regarded as an research element,the future reservoir development and its adjustment as well as the evaluation of fracturing effect as an ultimate object,and the distribution of dynamic and static parameters of geology and production as basic ones;finally,the fuzzy multiple factors decision making method is utilized to optimize proppant fracture length.The proposed theoretical mode can take into account many factors such as the effective permeability,effective thickness,present formation pressure and analytical water cut as well,etc.With the help of above theoretical mode,the optimum proppant fracture length of various development stage may be available in a relatively high precision,which may change the abstract character of past overall fracturing optimization plan and in the meantime,improve the effectiveness and instruction of the overall fracturing optimization plan to single well fracturing design.Verified by other reliable technique,the result of the proposed mode in the paper is precise and it is convenient to put it into field application.