第46卷
第3期
石油与天然气化工
CHEMICAL ENGINEERING OF OIL &. GAS
延长油田长2储层采出水回注结垢研究
畅平！张群正郭王钊柯从玉1郝西鹏1遂毅？
1.西安石油大学化学化工学院2.延长油田股份有限责任公司
115
摘要以延长油长2储层采油厂的采出水为研究对象，采用Scalechem软件对采出水及其与地表水、地层水的配伍进行了结垢预测。结果表明，在地面管线中，p(BaSO，垢)为176mg/L，p(CaCO，垢）为540mg/L；在井筒水平段，p(BaSO，垢）为168mg/L，p(CaCO，垢）为526mg/L，不符合油田回注水要求。需进行累凝复配工艺处理·e(PAC)为60mg/L，p(CPAM)为1.2mg/L，最佳加药间隔为 30s，搅拌时间为5min，处理后采出水透光率为88.1%，配伍性较好。采用Scalechem软件进行结垢预测，BaSO，结垢率降低超过75%，CaCO，结垢率降低甚至达到99%，降低了采水负荷，符合油田回注水要求。
关键词
采油污水
东凝
中图分类号：TE357.6
回注
结垢预测
文献标志码：A
D0I;10.3969/j.issn.1007-3426.2017.03.023
A studyonproduced waterscalingduring reinjectionfromChang2
reservoirinYanchangOilfield
Chang Ping', Zhang Qunzheng', Guo Wangzhao', Ke Congyu', Hao Xipeng', Lu Yi' 1. College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanzi, Chind
2.Yanchang Oilfield Co,,Lid,Yanan,Shaanzi, China
Abstract: In this study, taking produced water from oil production plant of Chang 2 reservoir, Yanchang Oilfield as a research object, scaling potential of the produced water, as well as the compatibility of produced water with surface water or formation water, were determined by the simulation tool Scalechem. The results showed that mass fraction of BaSO, and CaCO, scales in produced water would be 176 mg/L and 540 mg/L respectively in surface pipelines, while 168 mg/L of the BaSO, and 526 mg/L of the CaCO, was predicted to generate in horizontal section downhole, failing to meet the requirements of water reinjection in oil fields. Thus, it was necessary to treat the water with coagulation/flocculation process, The optimum operation parameters were identified to be with PAC dosage at 60 mg/L, CPAM dosage at 1. 2 mg/L, the interval time between the above two chemicals was 30 s, and mixing time for flocculation was 5 min. Light transmittance of the treated produced water was 88. 1% with better compatibility. According to Scalechem simulation, mass fraction of BaSO, scaling was reduced more than 75%, while CaCOs scaling was reduced almost 99% in reconciled water after treatment. The proposed treatment was proved to decrease the water production load and satisfy with the water reinjection requirements in oilfield.
Key words: oil wastewater, flocculation, reinjection, scale prediction
基金项目：西安石油大学国家级大学生创新创业训练计划项月“多功能抗高温钻井液处理剂的合成研究"(1339)；西安石油大学研究生创新与实践能力培养项目"聚合物压裂液返排液重复利用技术"（YCS16212074)。
作者简介：畅平（1992一），男，西安石油大学硕士研究生，主要研究方向为石油加工与化工工艺优化。E-mail；changping5828@ 163.com
通信作者：张群正（1964一），博士，教授，研究方向为有机合成、油田化学品的合成及应用。E-mail：qzzhangxsyu.edu.cn 万方数据