Abstract:

According to the characteristics of flowing through porous media，the flowing region of horizontal well is divided into a rectangular and two semi-cylindrical areas，the new model for predicting horizontal well deliverability in gas reservoir is established by considering the coupling of gas reservoir and horizontal wellbore and the pressure drop in the wellbore，as well as the law of conservation of energy and Darcy′s law.The change of pressure and flow amount in wellbore is analyzed，the comparison with Joshi model which considers pressure drop in wellbore is carried out，the error between computering result with the model and practically measured result is least.The result indicates the model is reliable to the situation of high permeability，long wellbore and slim wellbore.