复杂断块B油田提高注水井单井注水效率技术研究与应用

Research and Application of Improving Water Injection Efficiency of Single Well in Complex Fault Block B Oilfield

B油田为复杂断块油藏,以3%以上采油速度实现连续5年稳产高效开发。目前油田处于老井含水加速上升阶段,稳产具有一定困难,油井的自然递减率逐渐增加,注水井不同幅度出现注水压力逐渐升高,注不进去水,注水井面临单井注水效率低问题。本文结合断层失稳压力研究理论,结合全油田实际精细注水,采用油藏工程与数值模拟相结合,首次对单井进行注水井口压力优选,通过研究有效提高单井注水效率,确保油井稳定生产。该方法为类似油田开发提供了很好的借鉴经验。

B oilfield is a complex fault block reservoir, which has been developed stably and efficiently for 5 consecutive years at a production rate of more than 3%. At present, the oil field is in the stage of accelerated water cut rise in old wells. It is difficult to stabilize production. The natural decline rate of oil wells increases gradually. The water injection pressure of water injection wells increases gradually at different amplitudes, and water can’t be injected. The water injection wells face the problem of low water injection efficiency of single well. Combining with the theory of fault unsteady pressure research and the actual fine water injection in the whole oilfield, this paper uses the combination of reservoir engineering and numerical simulation to optimize the injection wellhead pressure for the first time. Through the research, the injection efficiency of single well can be effectively improved and the stable production of oil well can be ensured. This method provides a good reference for similar oilfield development.