封闭边界水平井压后产量预测模型

Model for Predicting Production of Sealed Boundary Horizontal Well after Fracturing

由于压裂工艺的限制和复杂的地层情况,水平井压裂所形成的裂缝长度和裂缝方位等不尽相同,增加了水平井产量预测的困难。在经典渗流模型的基础上,利用无量纲化处理、复位势理论和势能叠加原理,得到了封闭边界地层中裂缝相互干扰的产量预测模型,提出了相应的数值计算方法,研制了水平井压后产量预测软件。平均产量预测值与实际值误差在20%以内,并通过实例运用证实了该模型和软件的可靠性。

Due to the restriction of fracturing techniques and complex formation,the fractures of horizontal wells were different in length and azimuth etc,these factors increased the difficulty of production prediction.On the basis of classic percolation model and the application of dimensionless treatment technology,complex potential theory,a model was established for predicting production in the sealed boundary formation where fractures interfered with each other and a related numerical method was presented.A software was developed for predicting production after fracturing in the horizontal wells.The errors between prediction values and real values are within 20%.The application demonstrates that the model and the software are reliable.