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压裂过程中的天然裂缝诊断、滤失系数的计算是裂缝性油气藏压裂的关键技术;数值方法由于部分参数不易获得或参数代表性差,而影响其精度和实用性。分析了裂缝性地层压裂液滤失机理,建立了天然裂缝开启的滤失计算模型,根据实际压裂井的小型压裂测试数据,对天然裂缝的开启前后滤失系数进行了求解,得到了依赖于压力的滤失系数。计算表明,此滤失计算方法更能够反应天然裂缝地层的滤失特点,对裂缝性地层的压裂设计具有指导意义。
The natural fracture diagnosis and the calculation of the fluid loss coefficient are the key technologies for the fracturing of fractured reservoirs. The numerical methods are difficult to obtain because of some parameters or the parameters are poorly represented, which affects their accuracy and practicability. The fluid loss mechanism of fractured fluid in fractured formation was analyzed and the fluid loss calculation model of natural fractures was established. According to the small fracturing test data of actual fracturing wells, the fluid loss coefficients of natural fractures were obtained before and after filtration. Pressure dependent loss coefficient. The calculation shows that this method of calculating the fluid loss can reflect the characteristics of the filtration of natural fractures and is of guiding significance for the fracturing design of fractured formations.