摘要
含聚合物采出水的有效处理和达标回注是解决油田环保风险和生产压力的关键问题。文章通过对长庆油田陇东区域某试验站的采出水水质进行调研和评价,发现处理后的含聚采出水平均悬浮固体含量高达102.5 mg/L,无法达到Q/SY CQ 08011—2019《陇东油田采出水处理水质指标及分析方法》中规定的悬浮物≤50 mg/L的回注标准。针对上述问题,分析了聚合物分子量及浓度对悬浮物去除的影响,根据聚合物含量提出不同的采出水处理工艺:针对聚合物浓度≥50 mg/L的,形成高含聚合物废水的臭氧气浮处理技术,聚合物降解效率≥60%;针对聚合物浓度<50 mg/L的,形成了微涡流絮凝固液分离技术;在最佳搅拌条件和加药量下,处理后聚合物浓度≤10 mg/L,悬浮物含量≤25 mg/L,可达到Q/SY CQ 08011—2019的回注标准。研究成果可以为后续开展含聚采出水现场治理提供技术支撑。
Effective treatment and standardized reinjection of polymer-containing produced water is a key issue to solve the environmental risk and production pressure of oilfield.This article investigated and evaluated the extracted water quality of a test station in Longdong region of Changqing Oilfield,and found that the average suspended solids content of the treated polymer-containing extracted water reached 102.5 mg/L,which cannot meet the suspended solids≤50 mg/L specified in Q/SY CQ 08011—2019“Water Quality Indexes and Analytical Methods of Extracted Water Treatment in Longdong Oilfield”reinjection standard.To address the above problems,the influence of polymer molecular weight and concentration on the removal of suspended solids was analyzed,and different extraction water treatment processes were proposed according to the polymer content:for polymer concentration≥50 mg/L,ozone flotation treatment technology was formed for high polymer-containing wastewater,with polymer degradation efficiency of≥60%;and for polymer concentration<50 mg/L,micro-vortex flocculation solid-liquid separation technology was formed.Under the optimal mixing conditions and dosage,the polymer concentration after treatment≤10 mg/L,and the suspended matter content is≤25 mg/L,which can meet the reinjection standard of Q/SY CQ 08011—2019.The research results can provide technical support for the subsequent development of on-site treatment of polymer-containing extracted water.
作者
席佳欣
李岩
徐自强
同霄
刘宁
李云昊
郭欣
Xi Jiaxin;Li Yan;Xu Ziqiang;Tong Xiao;Liu Ning;Li Yunhao;Guo Xin(Oil and Gas Technology Research Institute of Changqing Oilfield Company;National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Field;Qindu District Environmental Monitoring Station)
出处
《油气田环境保护》
CAS
2023年第5期27-32,共6页
Environmental Protection of Oil & Gas Fields
基金
中国石油天然气集团有限公司科技开发项目“绿色油气田污染防治及生态保护研究”(编号2021DJ6604)。
关键词
含聚采出水
悬浮物
聚合物
臭氧混凝耦合
微涡流絮凝
produced water containing polymer
suspended solids
polymer
ozone coagulation coupling process
micro-eddy current flocculation
