英雄滩油田深层稠油油藏降粘剂驱探索与研究

Exploration and Research on Viscosity Reduction and Flooding in Deep Heavy Oil Reservoirs of the Hero Beach Oilfield

针对英雄滩油田大35-斜20块地层能量弱、油稠、低渗、敏感等因素影响,常规注水开发效果不佳;表现为注水压力高、储量动用不均衡,水驱效率低,油井易敏感高含水等问题,LPA降粘剂比实验室筛选的降粘剂A6B3具有一定的水相增粘与降低流度比的功能,进行构建LPA降粘剂体系,评价了降粘剂性能,通过并联填砂管岩心驱替实验与微观可视化驱油实验,研究了LPA降粘剂驱与普通降粘剂提高采收率的能力。实验结果表示:在实验温度70℃条件下,油水比为3∶7,LPA体系与大35-斜20块原油形成了较为稳定的乳状液,且降粘率最高达到98.2%。LPA降粘剂的采收率增值为6.67%,高于普通降粘剂的2.18%。在现场试验中,试验井组累油600余吨,投入产出比为1∶1.52,为该区块的稠油油藏降粘驱提供较好的经验。

Due to factors such as weak energy,oil viscosity,low permeability,and sensitivity in the formation of the Da 35 inclined 20 block in the Hero Beach oilfield,conventional water injection development has poor results;The performance of LPA viscosity reducer system was evaluated,which was characterized by high water injection pressure,uneven reserve utilization,low water drive efficiency,and high sensitivity of oil wells to high water content.Through parallel sand filled tube displacement experiments and microscopic visualization oil displacement experiments,the ability of LPA viscosity reducer flooding and conventional viscosity reducer flooding to improve oil recovery rate was studied.The experimental results show that under the experimental temperature of 70℃,with an oil-water ratio of 3∶7,the LPA system formed a relatively stable emulsion with the D35-X20 crude oil blocks,and the highest viscosity reduction rate reached 98.2%.The increased recovery rate of LPA viscosity reducer is 6.67%,which is higher than the 2.18%of ordinary viscosity reducers.In on-site experiments,the test well group accumulated over 600 tons of oil with an input-output ratio of 1∶1.52,providing good experience for viscosity reduction and flooding in heavy oil reservoirs in this block.