Studies on Causes Analysis and Countermeasure of Oilfield Produced Fluid Scaling and Corrosion
The scaling of oil and water treatment system in a thin-oil combined treatment station has become more and more serious in last 2 years.The blockage of outlet valve of heating furnace in oil treatment system and outlet pipelines of reaction tank in water system treatment has affected the continuous and stable operation of system.Through the analysis and detection of water type data and scale samples,the cause of serious scaling was that mixed produced liquid gets high supersaturation,the water treatment system meets with problems of aeration,and the water purification agent contains too high acidic soluble calcium ions.The corrosion is mainly caused by the breeding of system bacteria.After the improvement of water purifying agent and aeration time,the suspended calcium in the solution decreased from 48 mg/L to 9 mg/L,and the scaling period of the outlet pipeline of reaction tank was greatly shortened.Accordingly,the main cause of corrosion was that the sulfate reducing bacteria decreased from 1×106 mg/L to 2×102 mg/L,and the corrosion and scaling were obviously improved.