封闭油藏中多分支水平井的生产动态研究

根据Newman乘积原理和叠加原理 ,利用瞬时点源方法推导出了多分支水平井在箱形有限地层中的压力分布通式 ,并研究了水平井分支数、渗透率平面非均质性以及水平井水平段长度与水平井产量的关系。研究结果表明 ,水平井产量不随水平井分支数呈线性增长 ,在垂直于主渗透率方向布置水平井有利于提高产量。在水平井段总长度保持不变的条件下 ,增加单分支的长度比增加分支数更有利于提高产量

PERFORMANCE OF MULTILATERAL WELL IN BOX SHAPE RESERVOIR WITH NON PERMEABILITY BOUNDARY

A new analytic method for analyzing the behavior of multilateral well in box shape reservoir is presented on the basis of gransient point source function, Newman's product theorem, and superposition principle. According to the new formula, the performance of multilateral well in box shape reservoir with non permeability boundary is studied. The optimum number of branches, the effects of permeability anisotropy, and the relationship between the number of branches and the length of each branch are analyzed. The results of study show that there is no simple linear relationship between the number of branches and the oil production of a well. The favorable position of branches in a horizontal well is in the vertical direction of major permeable formation. With the same total length of lateral segments, increasing length of each branch in horizontal borehole has more effect on the increase of oil production than increasing numbers of branches.