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许多压裂的油气井都具有较高的地层温度 .为了获得最佳的压裂效果 ,在压裂设计计算时应该考虑裂缝中温度变化对压裂液流变特性和滤失速度等的影响 .因此 ,需要建立水力压裂裂缝中的温度场模型 ,用于计算施工过程中裂缝中压裂液的温度随时间和位置的变化 .根据热能平衡方程 ,建立起了滤失和非滤失裂缝缝面附近地层中温度的偏微分方程 ,然后借助于拉普拉斯变换和逆变换 ,获得了这两种情况下 ,裂缝壁面上的热流密度函数 .通过算例分析发现 ,裂缝壁面上的热流密度随注液时间的增加而减小 ;对于滤失性裂缝壁面 ,压裂液的综合滤失系数和地层的孔隙度越高 ,热流密度越低 .
Many fractured oil and gas wells have higher formation temperatures.In order to obtain the best fracturing effect, the influence of the temperature changes in the fracturing fluid on the rheological properties of the fracturing fluid and the filtration velocity should be taken into account in the fracturing design calculation. Therefore, it is necessary to establish a temperature field model in the fracturing of hydraulic fractures, which can be used to calculate the temperature changes of the fracturing fluid with time and position during construction.According to the thermal equilibrium equation, Surface temperature near the surface of the differential equation, and then by Laplace transform and inverse transform, obtained in both cases, the crack wall surface heat flux density function. Through the case study found that the crack wall heat flux density Decreases with the increase of injection time; for the fluid-loss fracture wall, the higher the integrated fluid loss coefficient and the porosity of the fracturing fluid, the lower the heat flux.