TZCZ201204020.pdf (549 K) 下载次数:17 ，你所在用户组没有附件下载权限 Abstract： A thorough analysis is presented regarding productivity and recovery ratio from, orientation, a fresh perspective. The concept of longitudinal-transverse seepage resistance ratio is proposed in relation to productivity, on the basis of contrastive studies of psudo-3D productivity formulae, derived by Qi Chengwei, of longitudinal bilateral and transverse wells in ribbon-shaped formations, and an important conclusion is presented to the effect that longitudinal horizontal well productivity surpasses that of the transverse well by considerable measure in ribbon-shaped formations. In terms of recovery ratio, flow net diagrams are plotted in accordance with complex potential formulae, derived by Qi Chengwei, of longitudinal bilateral and transverse fractures in ribbon-shaped formations, on the assumption that 3-D seepage fields excited by horizontal wells are approximated by 2-D fields excited by fractures with length equal to that of horizontal wells. The conclusion in this respect is that the recovery ratio of longitudinal wells is far lower than that of the transverse well in ribbon-shaped formations.
Key Words： ribbon-shaped formation; multi-lateral horizontal wells; orientation optimization; productivity formula; recovery ratio
