压裂施工闭合过程压裂液滤失分析

Analysis for Filter Loss of Fracture Fluid in Fracturing Closure Process

基于压开裂缝闭合过程中压裂液向储层中渗流的物理过程分析,建立了裂缝闭合过程中压裂液滤失量的数值计算方法。考虑了闭合过程中压裂液与岩石之间的热交换,通过建立水力裂缝温度场的计算模型,求出了闭合过程中温度场的变化,结合温度对压裂液流变性能影响的实验数据,给出了用有限差分方法求解的算法,实现了对压裂液滤失量的计算。从而为用数值模拟的方法研究垂直裂缝井闭合过程的压裂压力分析提供了理论依据。

Based on analysis of the closure physical process,this paper setups a numerical calculation method for the fracture fluid loss during the fracturing closure process.Considering the heat exchange between the fracture fluid and the rocks occurred in closure process and by means of building up hydraulic fracture temperature field model,the change of temperature field during the fracture closure process has been figured out and combined with the experiment data of that the temperature affects the fluid flowage ability,the filter loss has been calculated through the finite difference concrete algorithm.The paper provides the theoretical foundation in applying numerical calculation method for studying and analyzing the fracture pressure in the vertical fracture well closure process.