水力裂缝表皮因子是影响压裂效果的重要参数,目前常采用CincoLey公式进行分析。为正确认识水力裂缝表皮因子,从表皮因子的推导入手,通过理论分析指出了CincoLey公式的不合理之处,并给出了水力裂缝表皮因子的新公式。新公式与径向流表皮因子公式协调一致,能反映表皮因子的真实物理含义,并指出水力裂缝表皮因子与裂缝长度无关的物理实质。水力压裂应通过减小液体滤失深度或液体残渣物含量来减小水力裂缝表皮因子,而不是通过增大缝长减小表皮因子。该研究结果可为水力压裂的设计提供理论依据。

The hydraulic fracture skin effect is an important parameter affecting the production of fractured reservoirs, which is commonly analyzed by the formula proposed by Cinco-Ley.To understand hydraulic fracture skin factor correctly, the imperfection of Cinco-Ley’s formula was proposed by theoretical study on its deduction and a new formula about hydraulic fracture skin factor was established.The new formula is compatible with the skin factor of radial flow and represents the real physical essence of skin factor of hydraulic fractures,indicating the fracture skin factor is independent of fracture length.Hydraulic fracture skin factor can be reduced by enhancing the gel breaking rate or minimizing the fluid-loss distance rather than increasing the fracture length.