摘要
为解决某海上油田注水管道结垢问题,在模拟实验的基础上预测不同采出水混合水样的结垢类型、结垢量及结垢趋势,考察了不同温度、压力下的结垢量,通过混料实验中的极端顶点设计实现阻垢剂的最佳复配比,并结合垢样的微观形态分析验证阻垢机理,最后通过现场实验确定阻垢效果。结果表明,混合水样的结垢类型以CaCO_(3)为主,伴随少量的BaSO_(4)和SrCO_(3),在混合比例0.6∶0.4时的结垢量最大;结垢产物以CaCO_(3)的3种固体形式为主,在现场还检测出了铁的氧化物和黏土,说明现场受腐蚀与结垢共同作用影响;在PESA∶DTPMPA∶PAC=0.304∶0.446∶0.250,总药剂浓度100 mg/L时,阻垢效果最好,阻垢率为94.628 8%;添加复配药剂后,垢样从六面体向棉絮状、针状和球状依次转化,方解石含量逐渐减少;现场应用复配阻垢剂后,注水压力和腐蚀速率均有所下降,满足腐蚀结垢标准的限制要求。研究结果可为海上油田高效注水开发提供理论依据。
In order to solve the scaling problem of water injection pipeline in an offshore oilfield,the scale type,scale amount and scaling trend of mixed water samples of different produced water were predicted on the basis of simulation experiment,and the scale amount under different temperature and pressure was investigated.The optimal complex ratio of scale inhibitor was achieved through the extreme point design in the mixing experiment,and the scale inhibition mechanism was verified by the microscopic morphology analysis of scale samples.Finally,the scale inhibition effect was determined by field experiment.The results show that the scale formation type of the mixed water sample is mainly CaCO_(3),accompanied by a small amount of BaSO_(4) and SrCO_(3),and the scale formation amount is the largest when the mixing ratio is 0.6:0.4.The scale products are mainly three solid forms of CaCO_(3),and iron oxides and clay are also detected at the site,indicating that the site is affected by corrosion and scale.When PESA:DTPMPA:PAC=0.304:0.446:0.250 and the total concentration is 100 mg/L,the scale inhibition effect is the best,and the scale inhibition rate is 94.6288%.After addition of compound agents,the scale changed from hexahedron to wadding,acicular and spherical,and the calcite content decreased gradually.After the application of the compound scale inhibitor in the field,the injection pressure and corrosion rate are reduced,which meets the restriction requirements of the corrosion scale standard.The research results can provide theoretical basis for efficient water injection development in offshore oil fields.
作者
唐颢世
TANG Haoshi(Shenzhen Branch of CN00C(China),Ltd.,Shenzhen,Guangdong 518064,China)
出处
《石油工业技术监督》
2024年第1期34-39,共6页
Technology Supervision in Petroleum Industry
关键词
注水管道
结垢趋势
结垢量
阻垢效果
混料实验
water injection pipeline
scaling trend
amount of scaling
scale inhibition effect
mixing experiment
