海上稠油油藏特高含水率期调剖选井及应用

Well selection and application of profile control in extra high water-cut period of offshore heavy oil reservoir

Q油田已进入特高含水率期,剩余油分散,测试资料显示纵向吸水严重不均,急切需要通过调剖改善油田纵向注水矛盾。本次研究在传统的PI决策选井基础上,对斜率值进行了修正,修正后的斜率值可用于调剖选井分析。根据研究结果将注水井下步措施分为调剖井、维持现状井、增注井三类,基于研究成果在渤海Q油田开展调剖选井。现场实践证明,Q27、Q30、Q17、Q31井开展多井组合调剖,调剖后5口周边油井控水稳油效果明显,实现日增油30 m^(3)。该方法资料易于获取,能够指导油田后期调整挖潜,对其他海上注水油田具有较强的应用及参考价值。

Q oilfield has entered a period of extremely high water content,and the remaining oil is dispersed.Test data shows that vertical water absorption is seriously uneven.There is an urgent need to improve the vertical water injection contradiction in the oilfield through profile control.In this study,the slope value was corrected based on the traditional PI decision-making well selection.The corrected slope value can be used for profile control and well selection analysis.According to the research results,the next steps for water injection wells are divided into three categories,profile control wells,status quo maintenance wells,injection wells.Based on the research results,profile control and well selection were carried out in Bohai Q oilfield.Field practice has proven that multi-well combination profile control was carried out in wells Q27,Q30,Q17 and Q31.After profile control,the five surrounding oil wells achieved significant water control and oil stabilization effects,achieving a daily oil increase of 30 cubic meters.The data of this method are easy to obtain and can guide the oilfields later adjustments to tap potential.It has strong application and reference value for other offshore water injection oilfields.