群井致裂控制水溶盐矿开采分析及数值模拟

建立了群井致裂控制水溶开采的耦合数学模型,并对上述模型进行了数值模拟。结果表明,由于岩盐溶解的影响,岩盐水力压裂裂缝为距注水井口距离和压裂时间的函数,随裂缝的扩展及裂缝宽度的变化,裂缝中压力在逐步降低并向缝尖转移;由于注、出水井处溶液浓度及岩盐溶解速度的不同,随开采时间的延续,溶腔形状由裂缝形的扁平盘状、过渡为倒盆状、最后逐渐变为一锥形状,该形状有利于保持岩盐溶腔的稳定。理论分析和数值模拟结果表明,群井致裂控制水溶盐矿开采是一项可行的开采技术方法。

Analysis and numerical simulation of multi-well hydraulic fracturing and controlling solution mining for rock salt deposit

A coupled mathematical model of multi-well hydraulic fracturing and controlling solution mining for rock salt deposit is constituted, and the corresponding numerical simulation is carried out. The simulated results illustrate that the width of hydraulic crack is a function of the distance from injection well and fractured time because of the influence of rock salt solution, and the water pressure in the crack decreases with its extension forward. Meanwhile, the shape of cavity develops from a flat plate to an ultimate taper, which is a stable construction. Both the results of mathematical analysis and numerical simulation indicate that the technic of multi-well hydraulic fracturing and controlling solution mining for rock salt deposit is a feasible method.