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针对以往模型进行压裂设计与分析方法对结果偏差较大的实际情况,在对经典裂缝延伸和扩展PKN和KGD理论模型研究的基础上,运用断裂力学和流体耦合方法,建立新的缝壁表皮数学模型,获得新的裂缝缝壁表皮效应分段数学函数.将新模型与以往Cinco-Ley模型进行现场参数计算对比,结果表明:以往认为该表皮效应对产量影响只有5%,新模型表明该表皮效应对产量的影响可以达到50%,新模型揭示了以往认为高效压裂工艺下反而压后减产矛盾现象的真正原因.利用新模型指导压裂设计可降低裂缝缝壁表皮对产量的影响,增强压裂设计对储层的适应性和科学性.现场35井次试验表明,采用新模型后在降低成本的情况下,压裂效果增加1.5倍.
Aiming at the fact that the fracturing design and analysis method of the previous model deviate greatly from the result, based on the study of classical crack extension and extension PKN and KGD theoretical models, fracture mechanics and fluid coupling method are used to establish a new seam wall skin Mathematical model to obtain a new piecewise mathematical function of the crack effect on the wall effect of the cracks.Comparing the new model with the previous Cinco-Ley model, the results show that the effect of this epidermal effect on the yield is only 5% The effect of the epidermal effect on the yield can be up to 50%, and the new model reveals the real reason for the contradiction between the pressure reduction and the output reduction under the high-efficiency fracturing technology in the past.Using the new model to guide the fracturing design can reduce the influence of the crack seam wall epidermis on the output, And enhance the adaptability and scientificity of fracturing design to the reservoir.Experiment 35 in the field shows that the fracturing effect increases 1.5 times with the new model under the condition of cost reduction.