污水回注可行性油藏研究——以番禺4-2油田为例

A Reservoir Study on Feasibility of Produced Water Reinjection——By Tacking Panyu 4-2Oilfield for Example

针对海上油气田进入中高含水期后,生产污水大量产出的问题,以番禺4-2油田为例开展了污水回注油藏研究。在层位初选、配伍性试验分析的基础上,进行了地层储水能力、回注层位优选、注入压力、地层吸水能力的计算,确立了污水回注方案;并建立了概念模型,利用数值模拟研究对注水压差、逐年地层压力、层位最大注水量等参数进行评估,进而验证污水回注方案可行性。污水回注应综合地质油藏条件、配伍性研究等,选择适合目的层进行污水回注;有条件的情况下进行试注。污水回注具有良好的经济效益和社会效益。

In consideration of the problem of great amount produced water reinjection after offshore oil and gas fields entering into high water cut stage,a study of produced water reinjection reservoir was carried out by taking Panyu 4-2Oilfield for example.On the basis of initial layer selection and compatibility experimental analysis,the formation water storage capacity,reinjected horizon optimization,injection pressure and formation water absorption capacity were calculated and a water reinjection program was established.A conceptual model was established,the injection pressure difference,yearly formation pressure,maximum horizon injection rate and other parameters were evaluated by using numerical simulation,and then feasibility of water reinjection program was verified.Water reinjection is based on the geological conditions of reservoir and the study of compatibility etc.Then the appropriate formation is selected for water injection.If suitable condition is available,injection test should be carried out.Produced water reinjection has good economic and social benefits.