浅析煤储层压裂缝滤失系数的计算

Analysis on the Calculation of Leakoff Coefficient of Coal Reservoir's Pressing-crack

以煤储层压裂改造基本理论为基础,对石油系统相关压裂参数的计算模型进行修正,建立起适合本地区储层的水力压裂计算模型。通过分析沁水盆地南部煤层气井压裂工艺、压裂工艺参数及煤储层力学特征,建立了压裂液滤失系数计算的数学模型,并编制了相关计算程序。应用建立的数学模型,带入沁水盆地樊庄、郑庄区块压裂井的压裂施工参数,进行了压裂缝滤失系数等计算,结合压裂施工工艺与气、水产能进行施工适用性评价,优化压裂工艺参数。

Based on the basic theory of the coal reservoir＇s fracturing alteration,this paper revises the computational modesl of relative fracturing parameter of the petroleum system,and establishes the models that are fit for the coal reservoir＇s hydraulic fracturing calculation; through the analysis on the fracturing technologies and parameters and coal reservoir＇s mechanical characteristics of coal-bed methane wells in the northern part of Qinshui Basin,builds the mathematic model for the calculation of the leakoff coefficient of the fracturing fluid,and programs corresponding calculations; by using the established mathematic mode,makes the calculation of the fracturing parameters based on the fracturing construction parameters of the fracturing wells in Qinshui Basin＇s Fanzhuang Block and Zhengzhuang Block,and connecting with the fracturing construction technologies and gas-water yield,evaluates the construction＇s applicability,and optimizes the fracturing parameters.