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根据全三维水力压裂模型 ,建立了水力压裂施工过程中裂缝、盖层、底层以及裂缝附近地层中三维温度分布的数学模型。在该模型中 ,考虑了裂缝内的液体沿缝长和缝高方向作二维流动及裂缝向上、向下延伸到盖层和底层中的情况。计算实例表明 ,液体沿裂缝长度和高度方向同时流动时 ,在其长度和高度方向上都存在温度梯度。并且在沿裂缝高度方向上 ,由于滤失带对地层传热的影响 ,使得油层范围内的温度变化较小 ;而在油层范围以外 ,温度变化则较大
According to the full three-dimensional hydraulic fracturing model, the mathematical model of three-dimensional temperature distribution in the fractures, caprocks, basement and fractures near the fractures is established during hydraulic fracturing. In this model, the two-dimensional flow of liquid within the fracture along the length of the seam and the direction of the seam height and the upward and downward propagation of the fracture into the cap and bottom layers are considered. The calculation example shows that there is a temperature gradient in both length and height direction when the liquid flows along the crack length and the height direction at the same time. And in the direction along the fracture height, due to the influence of the strata on the heat transfer of strata, the temperature change in the oil layer is smaller; while outside the reservoir layer, the temperature change is larger