低渗透油藏中高含水率阶段调整对策

Adjustment strategy of low permeability reservoir in mid or high water cut stage

Z油区延9油藏在中高含水率阶段采油速度低、含水率上升快,亟需开发调整。本文在油藏精细描述的基础上,通过油藏动态分析,将油区划分为高产量区和低产量区,明确油井关停原因,制订开发调整对策。针对全区水驱储量控制程度低、低产量区长停油井多、注采井网不完善的问题,提出了油水井补孔、油井转注和关停井复产3种油水井措施。通过数值模拟方法,预测实施调整方案15年后,低产量区典型井组采出程度较现开发方案提高2.81%。该研究成果可以指导油田现场后续调整方案的编制和实施,也为同类型油藏开发调整提供技术借鉴。

Yan 9 reservoir in Z block is in mid or high water cut stage with low oil production rate and fast water cut rise,which is in urgent need of development adjustment.Based on the fine reservoir description and the dynamic analysis of the reservoir,this paper divides the oil region into high production area and low production area,clarifies reasons for production well shut-down,and formulates the development adjustment strategy.The analysis shows that the main problems are low degree of water flooding control,large number of production wells shut-down and imperfect injection-production well pattern in this stage.3measures(reperforation,shut-down well put back on production and making production well convert into injection well)are put forward to solve these problems.Through numerical simulation,it is predicted that the recovery degree of typical well group in low production area will increase by 2.81%compared with the current development plan 15 years after the implementation of adjustment plan.The research results can guide the preparation and implementation of the field adjustment plan,and also provide a technical reference for the same type of reservoir development adjustment.