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根据周期注水的层内弹性－毛管力的交渗理论，采用地质模型和相应参数＋数值模型＋油藏工程＋经济评价＋数理统计的方法，建立了一个评价注水油田转为周期注水措施可行性的计算公式，这个公式推导的基础是投入产出平衡的原则。公式全面地考虑了影响周期注水效果的４种因素：油藏参数；开发参数；周期注水参数和经济参数。
According to the theory of infiltration - capillary force in seepage in cyclic waterflooding, a method of evaluating the effect of converting waterflooding oilfield into periodic waterflooding is established by means of geological model, corresponding parameters + numerical model + reservoir engineering + economic evaluation + mathematical statistics The formula is based on the principle of input-output balance. The formula takes into full consideration the four factors affecting the waterflooding effect of the cycle: reservoir parameters, development parameters, periodic water injection parameters and economic parameters.