加砂压裂压力分析及应用

压裂期间及压裂停泵后的井底压力的变化规律反映了裂缝本身及其周围地层的情况，因 此可以应用压裂压力资料对其进行分析解释。在此基础上，本文根据Nolte原理研制了一套解释软 件，既可准确判定裂缝模型、分析裂缝延伸情况以指导现场施工，又可获得压裂后的裂缝长度、宽度， 压裂液效率、滤失系数，裂缝闭合压力和闭合时间及地层主应力等评价参数。现场实际应用表明，该 软件可起到实时监测及压后评估的作用，具有较强的实用价值。

An Analysis and Its Application of Sanded Fracture.

The variation law of downhole pressure during and after theperiod of fracture reflects the conditions of crack and its sur roundings. So, the fracture' s data can be used of making an analysis and interpretation. On the base of that, the paper de velops a set of interpretative software according to Nolte's theory which not only concludes the crack model accurately, analyses the situation of crack extension so as to guide the operation, but also gains some interpretive parameters after the fracture, such as the length and width of crack, fracture fluid efficiency, fluid loss coefficient, crack' s closed pressure, closed time and formation' s main stress,etc. Field applications indicated that this software could play a role for real-time monitor and postfrac evaluation and have strongly practical value.