T油田注水水质试验分析

Experimental Analysis of Injection Water Quality in T Oilfield

T油田注水井注入困难,注水水质造成了储层损害,因此有必要进行注水试验分析。根据T油田储层和流体特征,分析了储层的敏感性,储层速敏、水敏和盐敏的损害程度均是中等偏弱。调查注水水质现状发现,注入水细菌和溶解氧含量高。通过注入水与地层水水质试验、注入水和地层水离子配伍性试验,发现注入水与地层水的化学性质差异较大,混配水结垢现象不十分明显,结垢量随混配样中地层水所占比例的增加而增加。该研究以期为下一步注水水质标准研究提供试验基础。

It is difficult for water injection in T Oilfield,and formation damage is caused by water quality,so it is necessary to carry out experimental analysis of injected water.According to the reservoir and fluid characteristics in T Oilfield,reservoir sensitivity is analyzed,reservoir velocity sensitivity,water and salt sensitivities are moderate to weak.It is indicated by the investigation of injection water quality status that the bacteria content of injected water and dissolved oxygen content are high.Formation water quality test and formation water ion compatibility experiments show that there exists bigger difference between chemical properties of injected water and formation water and scaling is serious in mixed water,the scaling amount increases with the increase of formation water proportion in the mixed samples.It provides the basis for the study of water quality standard of water injection at next stage.