某联合站采出水水质分析及阻垢技术研究

Analysis of Produced Water Quality and Study on Scale Inhibition Technology of a Multi-purpose Station

受地质条件和注水水质的要求,某联合站接收来自不同Y1和Y2层位的采出水,在采出水处理设备、管线和井筒中出现大量的结垢产物,影响了联合站水处理系统的正常运行。为避免这种情况,在采出水水质分析的基础上,通过Scalechem结垢趋势模拟软件,考察不同层位采出水的配伍性、结垢趋势、结垢量和结垢类型,结合室内实验验证了模拟结果的准确性,随后对不同类型的阻垢剂进行筛选,将化学阻垢法和工艺阻垢法结合,实现复合式清垢技术。结果表明:在Y1∶Y2=0.6∶0.4时,结垢量最大为366.46 mg/L,结垢产物为CaCO_(3)和BaSO_(4);随着温度上升,CaCO_(3)和SrCO_(3)的结垢量有所增加,BaSO_(4)的结垢量有所减少;随着压力上升,CaCO_(3)和BaSO_(4)的结垢量有所下降;当DTPMPA∶PASP的复配比例为1∶1时,阻垢率为94.2%,该配方最大程度发挥了阈值、螯合增溶、晶体错位作用;距离油区出口20 m后的管段是流速较低、容易结垢的区域,可安装械清管器,实现定期清除结垢产物的目的。

Due to the requirements of geological conditions and injection water quality,a multi-purpose station receives produced water from different Y1 and Y2 formations,and a large number of scale products appear in the produced water treatment equipment,pipeline,and shaft,which affects the normal operation of the multi-purpose station water treatment system.In order to avoid this problem,on the basis of the produced water quality analysis,the compatibility,scaling trend,scale amount,and scale type of produced water at different levels are investigated by Scalechem scaling trend simulation software.The accuracy of simulation results is verified through laboratory experiments.Then different types of scale inhibitors are screened,chemical scale inhibition method and process scale inhibition method are combined to realize compound scale removal technology.The results show that when Y1:Y2=0.6:0.4,the maximum amount of scaling is 366.46 mg/L,and the scaling products are CaCO_(3) and BaSO_(4).With the increase of temperature,the scale formation of CaCO_(3) and SrCO_(3) increases,while the scale formation of BaSO_(4) decreases.With the increase of pressure,the scale formation amount of CaCO_(3) and BaSO_(4) decreases.When the mixture ratio of DTPMPA:PASP is 1:1,the scale inhibition rate is 94.2%,which shows that the formula exerts the effects of threshold value,chelation solubilization,and crystal dislocation to the greatest extent.The pipe section 20 m away from the oil zone outlet is an area with low flow rate and easy scaling.Mechanical pigs can be installed to remove scaling products regularly.