一、前言 在压裂过程中,压裂液在地层中的滤失量直接影响到裂缝长度的计算。裂缝长度是控制压裂效果的基本因素之一。因此研究压裂液在地层中的滤失类型、数量,对于压裂设计、效果预测是很重要的。R.D卡特认为压裂液进入地层后,一部分留在缝内,成为延伸裂缝的有效液体,而大量的压裂液则经由壁面垂直地滤失于地层中,成为无效液体。卡特在缝宽为常数的情况下,利用下列物质平衡等式导出这种关系, I. Introduction In the process of fracturing, the fluid loss in the formation directly affects the calculation of fracture length. Crack length is one of the basic factors controlling the fracturing effect. Therefore, it is important to study the type and amount of fluid loss in the formation, and to predict the effect of fracturing design. R.D Carter that fracturing fluid into the formation, part of the stay in the seam, as an effective solution to extend the fracture, and a large number of fracturing fluid through the wall perpendicular to the formation of strata lost filtration, as an invalid fluid. Carter in the seam width is constant, the use of the following material balance equation to derive this relationship,