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Mechanisms of improving oil recovery efficiency by horizontal well in high water-cut stage
XIAO Kang1, JIANG Han-qiao1, LI Jun-jian2
(1.College of Petroleum Engineering in China University of Petroleum, Beijing 102249, China;2.Oil Production Institute, Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China)
Abstract:
Based on the geological and production performance data in Gudao Oilfield, a large scale artificial consolidated multi-layer model reflecting the normal rhythm was established according to the similar principle of waterflooding. Considering different reservoir parameters and working system, horizontal and vertical wells were used to tap the potential respectively when well group physical model reaches high water-cut stage. And combined with numerical simulation, mechanisms of both sweep and displacement efficiency contributing to improving oil recovery with horizontal well compared with vertical well were studied. The results show that the effect of horizontal well tapping remaining oil is better than that of vertical well. Contribution of sweep efficiency to improving oil recovery with horizontal well compared with vertical well occupies main position, and difference between sweep efficiency and displacement efficiency contribution is affected by reservoir parameters and working system. With the increase of water cut, though the contribution differentiation degree between sweep efficiency and displacement efficiency becomes smaller and smaller, contribution ratio of sweep efficiency to displacement efficiency is always more than 1.
Key words:  reservoir  horizontal well  high water-cut  physical simulation  numerical simulation  sweep efficiency  displacement efficiency