稠化酸返排液回注过程中结垢性与处理方法研究  

Study on scale and treatment method of thickened acid backflow fluid in reinjecting process

作　　者：谢娟 张杰 卢雅婷 樊仰杰 

机构地区：[1]西安石油大学化学化工学院陕西省油气田环境污染控制与储层保护重点实验室,陕西西安710065 [2]长庆油田分公司第十采油厂,甘肃庆城745100

出　　处：《应用化工》2018年第1期43-47,共5页Applied Chemical Industry

基　　金：国家自然科学基金项目资助(51504193);陕西省教育厅重点项目(17JS112)

摘　　要：针对陕北某油井稠化酸返排液pH低、SS含量高、低透光率等特点,通过分析稠化酸返排液的水质组成性质,采用Scalechem软件对稠化酸返排液与注入水的不同配比混掺进行结垢预测分析,并选择絮凝方法,对返排液进行处理。结果表明,在井筒水平段,Ca CO3结垢量为522 mg/L,Ba SO4结垢量为159 mg/L;在地面管线中,Ca CO3结垢量为540 mg/L,Ba SO4结垢量为172 mg/L,均不符合油田回注水标准(SY/T 5329—2012)。通过絮凝对稠化酸返排液处理,PAC投加量为500 mg/L,CPAM投加量为1.2 mg/L,加药间隔时间为20 s,搅拌时间为5 min时,稠化酸返排液透光率为89.8%,处理后稠化酸返排液和注入水按不同体积比混合,Ca CO3结垢量降低99.9%,Ba SO4结垢量降低超过87.4%,混合水配伍性良好,达到油田回注水标准,且混合后可降低界面张力,有利于提高注入水驱油效率。According to the characteristics of pH value,high SS content and low light transmittance of the heavy acid in the oil well in northern Shaanxi,the water quality composition of the concentrated acid reflux liquid was analyzed,and the Scalechem software was used to calculate the scaling prediction of mixed water with rejecting water and thickened acidified backflow in certain ratio. The flocculation was selected to treat thciked acid liquid. The results showed that the amount of Ca CO3 scale was 522 mg/L,and the Ba SO4 scale was 159 mg/L in the horizontal section of the wellbore. In the ground pipeline,the amount of Ca CO3 scale was 540 mg/L,Ba SO4 scale was 172 mg/L. All of those do not meet the reiecting water quality standard（ SY/T 5329—2012）. The dosage of PAC and CPAM was 500 mg/L and1. 2 mg/L,especially. The time interval of dosing was 20 s,and the time of stirring was 5 min. The light transmittance of the condensed acid was 89. 8%. After the treatment,the concentrated acid reflux liquid and the injected water were mixed in different volume ratio,the scaling rate of Ca CO3 decreased by99. 9%,and Ba SO4 was more than 87. 4%. The compatibility of mixed water was good,which reached the reinjecting water quality standard. And while,it can reduce the interfacial tension of mixing water,which is beneficial to improve the efficiency of water reinjection.

关 键 词：稠化酸 返排液 结垢预测 配伍性 界面张力 

分 类 号：TQ314.253[化学工程—高聚物工业]