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基于立方定律推导了交叉联接方式的流量计算方法,讨论得出了该方法与实测结果存在偏差的主因:过量压力降损耗.定义了过量压力降损耗系数,分析了过量压力降损耗系数的变化规律.结果表明:影响交叉裂隙的过量压力降损耗的因素有:交叉角度、裂隙隙宽及雷诺数,其中雷诺数对过量压力降损耗的影响最大;过量压力降损耗系数与雷诺数近似成二次下降的关系;交叉裂隙中流体的偏流及交汇只是表象,裂隙交叉处的流动收缩或者扩张效应才是过量压力降损耗产生的真正机制.在此基础上得到了交叉裂隙的准确流量计算公式,并探讨了该公式在实际裂隙网络中的简化应用方法.
Based on the cubic law, the calculation method of cross-connection flow was deduced, and the main cause of deviation between the method and the measured results was discussed: Excessive pressure drop loss. Define the excess pressure drop loss coefficient and the change law of excess pressure drop loss coefficient The results show that the factors influencing the excessive pressure drop loss of cross fractures are: crossing angle, crack width and Reynolds number, of which the Reynolds number has the most influence on the excess pressure drop loss; the excess pressure drop loss coefficient is approximately the same as the Reynolds number The relationship between the pressure drop and the cross flow is only the appearance and the flow contraction or expansion effect at the intersection of the fractures is the real mechanism of excessive pressure drop loss.Based on this, The simplified application of the formula in the actual fracture network is discussed.