重复压裂初裂缝有效率评价方法

在对重复压裂井进行产能评价时，常常认为初次压裂形成的裂缝完全失效，这种考虑与实际情况是不相符合的，导致对重复压裂井的产能预测有很大的误差。为此，建立了裂缝有效率评价及重复压裂井产能评价的数学模型和模型的数值求解方法，考虑只有初裂缝存在，根据重压前的产量和含水率，通过调整初裂缝的各参数，拟合计算了初裂缝的有效率。在考虑重复压裂裂缝和初裂缝共同作用下，对重复压裂井进行了产能评价，验证了重复压裂井中初裂缝的有效性。

Evaluation Method for Efficiency of Primary Fracture in Refracturing

When estimating productivity of refractured well,the primary fracture is considered to be disabled and it is not coincident with actual facts and a great error of prediction result exists.Therefore,a mathematic model and corresponding solution numerically solbing method,for efficiency appraisal of fracture and productivity estimations,are provided in this paper.Based on post-refracturing production data and water cut,considering that only primary fracture exists,its efficiency is coupled by adjusting parameters.The productivity of refractred well is further calculated taking account into the interaction of refractured fracture and primary productivity and meanwhile the efficiency of primary fracture is validated.