Abstract: Aiming at poor effects of conventional water flooding in heavy oil reservoir development,the gravity assisted lateral horizontal well water flooding (GALHW) is developed.Based on evaluating experiment of horizontal well water injection,oil displacement mechanism of GALHW is analyzed in the vertical and plane direction,and GALHW can sufficiently utilize the energy of injected and bottom water,raise reservoir recoverable degree vertically,increase water sweeping and part displacement efficiency.With conceptual model from a certain heavy oil reservoir with bottom water,GALHW′s optimization in flooding network and pay zones are studied,and optimal injector-producer pattern,injector-producer space and horizontal section orientation,non-dimension height of water avoidance optimization plate and non-dimension perforation extent optimization plate considering the variation of bottom water volume and formation rhythm are obtained.The results provide criterion for similar reservoir design of GALHW′s flooding network and perforation position.

Key words: heavy oil reservoir, horizontal well water injection, bottom water, plate, well pattern