运用小型压裂测试确定储层参数新方法

在新区或低渗透油藏，需借助小型压裂测试来求取大型压裂设计所需参数，目前运用小型压裂测试闭合前的压力数据确定储层参数的误差较大，影响大型压裂的施工效果。为提高所需储层参数的准确度，利用小型压裂测试闭合后的压力数据，把小型压裂测试与试井分析理论相结合，建立了小型压裂测试闭合后压力分析的线性流和径向流的数学模型，利用点源函数、Homer法产量等效原则及Duhamel叠加原理，给出了其解析表达式，并提出了一套小型压裂测试闭合后压力分析的新方法，可以快速准确地确定油藏压力及油藏渗透率。通过现场实例，验证了该方法的准确性。

New Method to Determine Reservoir Parameters with the Application of Mini Frac

In new discovered area or low permeability oil reservoir, mini frac test is needed to obtain the required parameters for massive hydraulic fracture. At current, the pressure data before mini frac test are used to determine reservoir parameters, and the error of this method is larger to influence the operation results of massive hydraulic fracturing. In order to increase the accuracy of required reservoir parameters, the pressure data after mini frac test are used. Based on the comprehensive consideration of mini frac test and WTI theory, the mathematical model for linear flow and radial flow after the mine frac test is built. Based on point source function, production equivalent rules of Horner method and Duhamel overlay principle, the analysis expression is obtained. Meanwhile, a new method for pressure analysis after mini frac test is proposed for quick and accurate determination of reservoir pressure and permeability. This method can aid the job design of massive hydraulic fracturing, and the field experiment has verified the accuracy of the method.