油田集输及污水系统碳酸钙结垢预测研究

结垢是油田采出水集输过程中遇到的最严重的问题之一,为了避免由于结垢而造成的不良影响,应对结垢类型及趋势进行科学而准确的预测,现场可以根据预测结果采取相应的防垢和除垢措施。大庆油田集输及污水系统出现结垢问题,对系统中各节点的水质指标以及特征垢样的外貌特征和组成成分进行分析,结果表明集输及污水系统水质有碳酸盐和硅酸盐结垢趋势,现场垢样是碳酸盐、有机物、硅酸盐和氢氧化铁等的混合垢,主要成分是碳酸钙。使用稳定指数法(SAI)对大庆油田集输及污水系统碳酸钙结垢趋势及最大结垢量进行预测。预测结果:稳定指数4.0SAI5.0,最大结垢量100PTB250,严重结垢。

Research of calcium carbonate scaling prediction on oil gathering and sewage system

Scale occurrence is one of the most serious problems in the process of gathering of oilfield produced water encountered in,it is necessary to scientifically and accurately predict scaling types and trends,in order to avoid the adverse effects caused by scaling.Field can take corresponding measures for anti-scaling and descaling through the results.Gathering and sewage system is in the scaling in Daqing Oilfield,water quality indicators;appearance and composition of characteristics scale of each node were analyzed.Results showed that water quality of the gathering and sewage system trends CaCO3,scale was a carbonate,organic matter,silicate and iron hydroxide mixed fouling,etc.,the main component was calcium carbonate.Using stability index method（SAI） to predict calcium carbonate scaling tendency,and predict maximum amount of scaling.The results showed that stability index 4.0〈SAI〈5.0,100〈PTB〈250.Calcium carbonate scaling is severe.