池46长8油藏聚合物微球调驱效果评价

Effect evaluation of polymer microspheres profile control in Chi 46 Chang 8 reservoir

姬塬油田池46长8区块受储层非均质性、超前注水等影响,开发过程中区块含水上升速度加快,油井产量下降。2017年底区块综合含水达到60%,自然递减14.7%,含水上升率高达7.9%,采出程度仅7.7%,水驱开发效果变差,有必要开展调驱控水稳油治理。围绕池46区块2016-2018年聚合微球调驱实施情况,开展调驱效果评价。结果表明,聚合物微球调驱后,注水压力整体上升,注入压力上升形态与聚合物微球深部调驱机理具有一致性。典型井吸水剖面测试结果显示吸水状况得到改善,对应油井增油降水效果明显。从不同日产液量、含水、井组日增油量、见效周期等方面分析了区块聚合物微球调驱见效特征。

Influenced by reservoir heterogeneity and advanced water injection development, the water cut increases rapidly and the production of oil wells decreases in Chi 46 Chang 8 Block of Jiyuan oilfield. By the end of 2017, the water cut of the block reached 60 %,natural decline was 14.7 %, water cut rise rate was as high as 7.9 %, and the recovery was only 7.7 %. Furthermore, water flooding development effect becomes worse, it is necessary to carry out water control and oil stabilization treatment. On the basis of implementation of polymer microsphere profile control of Chi 46 block in 2016-2018 years, the effect of profile control was evaluated. The results show that the injection pressure increases as a whole after polymer microsphere profile control. The increase of injection pressure is consistent with the mechanism of polymer microsphere profile control.The water injection profile test results of typical wells show that the water absorption condition has been improved, and the effect of increasing oil and decreasing water is obvious.The effective characteristics of polymer microsphere profile control and are analyzed from different daily liquid production, water cut, daily oil increment of well group and effective period.