低渗气藏水平井压裂选段决策方法

Decision-Making Method for Selection of Horizontal Well Fracturing Point in Low Permeability Gas Reservoir

针对低渗气藏水平井分段压裂选层选段难的问题,通过收集压裂层电性、物性、含油气性参数和压后日产气量和无阻流量统计,应用数理统计和模糊数学理论,量化各项影响压裂效果的参数,计算选层系数,并将选层系数与压裂效果进行相关分析,确定压裂有效产量对应的选层系数界限值,对压裂水平井逐段进行评价。利用本方法可以对水平井压裂井段效果进行提前预测并定量评价,改变了过去水平井压裂井段措施决策的经验性和随意性,提高了水平井段压裂措施决策的准确性和措施有效率,增加了低渗气藏开发效果。

According to problems being difficult to select layers or points of the low permeability gas reservoir in staged fracture of horizontal well,through collecting the properties of electronics,physics,gas-bearing,productivity after fracturing and statics of open flow,by use of theories of mathematical statistics and fuzzy mathematical,the key parameters that affect the production of horizontal well can be quantified to compute the zonal selection factor,and to analyze the relations between zonal selection and fracturing effect,to determine evaluation the boundary value of zonal selection factor,and to evaluate each fracturing stage. This method can be applied to estimate the horizontal well fracturing effect and quantitatively treatment,which also changes the situation of personal experience and randomness occurred in horizontal well fracturing interval selection in the past,improves the accuracy of horizontal well decision-making method and increases development effect of low permeability gas reservoir.