To solve the problem of water quality deterioration along the water injection process in Bonan Oilfield,the composition of suspended solid particles was detected by analytical instruments such as chromatography,mass spectrometry,spectroscopy,and so on.Combined with the test results of suspended solid particles and water quality data,it is proved that Fe2+/Fe3+ in water reacts with S2-to form sulfide precipitation,which is the main cause for the deterioration of water quality along the process.Visual observation and mechanism analysis shows that dissolved oxygen in the water is also involved in the precipitation reaction;ferrous ions are oxidized to iron ions and produce iron hydroxide precipitation.The oxidation method was used in the field to remove ferrous ions and sulfur ions.After the test,the content of sulfur ions was stabilized to 0,and the mass concentration of total iron was decreased from 10.65mg/L to 0.05mg/L.
water injection processwater qualitysuspended solidsulfur contentoxidation
NETL
NSTL
维普
万方数据
