重复压裂井产能评价方法研究

由于对重复压裂井原有裂缝失效程度的难以评价,重复压裂井的产能预测常常有很大的误差。为此,根据重复压裂井的压前产量和含水率,拟合了原有裂缝的有效率,在考虑新裂缝和原有裂缝的部分作用情况下,建立了油水两相平面二维的裂缝-油藏数学模型,通过对模型的数值求解,对重复压裂井进行了产能评价。研究表明,在考虑新、老裂缝共同作用下的产能评价方法,能更为准确地预测重复压裂后的生产动态情况,为压裂时机的确定、压后经济效益的预测都具有重要的指导意义。

A study of evaluation method of productivity of refracturing wells

Prediction results of productivity of refracturing wells often has large error because the effectiveness failure of the previous fractures in refracturing wells is difficult to evaluate. The validity of previous fractures is fitted according to the pre - fracturing production rate and watercut of refracturing wells. A two - phase 2 - D plane fracture - reservoir mathematical model is built taking into consideration the effects of both previous and new fractures. The productivity of refracturing wells is evaluated through achieving the numerical solution of the model. This evaluation method can more accurately predict the performance of wells after refracturing and guide the determination of fracturing time and prediction of post -fracturing economic benefits.