S井区低渗油藏注水系统优化调整技术

Optimization Technology of Water Injection System for Low-Permeability Reservoir in Wellblock S

S井区注水系统主要存在设备能力不足、干线压损大、水井欠注较严重、设备维护工作量大费用高、站区水质污染等问题。采用分压注水、注水设备配置优化、仿真模拟、非金属管材防腐、密闭注水等技术,对S井区注水系统进行优化调整。调整后,S井区日增注水2115 m^(3),水井配注满足率提高20.7%,油藏产量自然递减率下降4.8%,注水系统效率提高4.1%;原欠注老井满足配注需求,对应井组日增油33.4 t,年增效2675×10^(4)元,得到了较好的提质增效效果。

The existing water injection system in Wellblock S mainly had such problems as insufficient equipment capacity,great pressure loss of main pipeline,seriously insufficient injection of injectors,tremendous equipment maintenance volume and cost,and polluted water in the station area.Later,the system was optimized by using the technologies of partial pressure injection,equipment configuration optimization,simulation,non-metallic pipeline for corrosion protection,and closed water injection.After optimization,the increase of daily injection in Wellblock S is 2115 m3/d,injection satisfaction rate of injectors is increased by 20.7%,the natural decline rate of reservoir production is decreased by 4.8%,and the efficiency of injection system is increased by 4.1%.Old injectors that failed to satisfy water injection requirements can now meet injection allocation requirements,the corresponding well group has a daily oil increase of 33.4 t,and the annual increase in earnings is CNY 26.75 million.The effect on improving quality and increasing earnings is remarkable.