基于实验优化设计的油田采出水稳定技术研究

Oilfield produced water stabilization technology based on experimental optimization design

某油田联合站的过滤器频繁发生结垢物堵塞,影响了采出水稳定工艺的正常运行。为解决这一问题,在进行多节点水质分析和腐蚀结垢产物分析的基础上,筛选了合适的除钙剂,对除钙、除铁所需的各类药剂进行了单因素影响实验,并对加药顺序进行了调整,基于极端顶点设计完成了多种响应指标值下的混料实验设计,并进行了现场效果验证。结果表明,钙、铁离子引发碳酸钙和铁的氧化物是导致水质不达标的主要原因;在Na_(2)CO_(3)→NaOH→H_(2)O_(2)→PAC→PAM的加药顺序下,对钙、铁离子的复合处理效果最佳;当Na_(2)CO_(3)、NaOH、H_(2)O_(2)、PAC的配比分别为0.4852、0.2136、0.2034、0.0978,游离Ca^(2+)质量浓度、总铁质量浓度和透光率等指标可达到最优,综合指标的复合合意性为0.73,采出水中油和悬浮物含量满足标准要求。

Frequent fouling of filters in an oilfield united station has negatively affected the normal operation of the produced water stabilization process.To solve this problem,based on multi-node water quality analysis and corrosion product analysis,suitable calcium removers were screened,single-factor experiments were carried out on various agents for calcium and iron removal,and the dosing sequence was adjusted.Mixing experiment design under multiple response index values,and field verification were completed based on extreme vertex design.The results show that calcium carbonate and iron oxides induced by iron ions and calcium are the main causes of substandard water quality.Under the dosing sequence of Na_(2)CO_(3)→NaOH→H_(2)O_(2)→PAC→PAM,the combined treatment effect of iron ions and calcium is the best.When the ratio of Na_(2)CO_(3),NaOH,H_(2)O_(2),and PAC is 0.4852,0.2136,0.2034,and 0.0978,respectively,the indexes including free Ca^(2+)concentration,total iron concentration,and light transmittance can reach the optimal level with the composite agreement of the comprehensive index at 0.73.Effluent oil and suspended matter meet the standard requirements.