裂缝周边脱砂带对裂缝扩展的控制作用

Controlling action of sandout belt at fracture periphery on fracture propagation.

在脱砂压裂过程中 ,裂缝周边一旦形成砂桥 ,裂缝会在周边法向 (缝长和缝高方向 )停止增长 ,而缝宽则以较快的速度增长并形成相对意义上的“短宽裂缝”。从岩石造缝机理、流体力学和渗流力学的角度探讨了裂缝周边脱砂带对缝长和缝高的控制作用 ,并对“脱砂质量”

During the process of sandout?fracturing, once the sand bridge is formed at fracture periphery, the fracture will stop enlarging in periphery normal direction (frac length and frac height direction) while frac width will increase quickly, and 'short?wide fracture' will be formed in relative sense. The controlling action of sandout belt at fracture periphery on frac length and frac height is discussed from the point of frac generation mechanism of rock, hydromechanics and percolation flow mechanics. And the problem of 'sandout quality' is analyzed briefly.