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目前 ,提出了一种用于分析高渗透地层端部脱砂 (TSO)压裂后的压力曲线斜率形态的分析方法。裂缝停止延伸后 (即端部脱砂后 ) ,注入排量并不为零。这时如果注入排量大于滤失速率 ,裂缝体积和净压力 (柔度恒定时 )一定会增大 ;如果注入排量降到滤失速率以下 ,裂缝净压力一定会下降。一种新的压裂 /充填事后的分析方法使用了压力曲线斜率分析技术。脱砂过程中压力曲线斜率可作为检测小型压裂和裂缝效率的一种手段。
At present, a method for analyzing the slope shape of the pressure curve after the high-permeability formation (TSO) fracturing is proposed. After the crack stops extending (that is, the end of the sand), the injection displacement is not zero. In this case, if the injection displacement is greater than the filtration rate, the fracture volume and net pressure (when the compliance is constant) will certainly increase; if the injection displacement drops below the filtration rate, the net fracture pressure will decrease. A new post-fracturing / filling analysis method uses pressure curve slope analysis. The slope of the pressure curve during sand removal can be used as a measure of the effectiveness of small fractures and fractures.