聚合锆盐对海上聚合物型废弃水基钻井液的絮凝效能与机理  

Flocculation efficiency and mechanism of offshore polymer waste water-based drilling fluids by polymeric zirconium salts

作　　者：李斌 韩超[3] 严海源 郭晓轩 刘旭[1,2] 岳明 王恩全 孔令昊 LI Bin;HAN Chao;YAN Haiyuan;GUO Xiaoxuan;LIU Xu;YUE Ming;WANG Enquan;KONG Linghao(CNOOC Key Laboratory of Offshore Drilling Fluids and Cementing,Tianjin 300459,China;China Oilfield Services Limited,Tianjin 300459,China;Tianjin Branch of CNOOC(China)Co.,LTD.,Tianjin 300459,China;National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]中国海油海上钻完井液与固井重点实验室,天津300459 [2]中海油田服务股份有限公司,天津300459 [3]中海石油(中国)有限公司天津分公司,天津300459 [4]中国科学院生态环境研究中心,工业废水无害化与资源化国家工程研究中心,北京100085

出　　处：《环境工程学报》2025年第1期152-159,共8页Chinese Journal of Environmental Engineering

基　　金：中国海油集团公司十四五重大科技项目基金项目:重大安全工程及绿色环保技术(KJGG-2022-17)。

摘　　要：聚合物型废弃水基钻井液具有极高的稳定性、难以固液分离,是制约海上油田对其进行资源化循环利用的关键瓶颈问题。本研究采用聚合锆盐脱稳絮凝聚合物型废弃水基钻井液,并研究了药剂碱化度、药剂投加量、搅拌速度、絮凝时间、絮凝温度等各个工艺参数对絮凝的影响,筛选出最优的药剂配方与处理条件。对比了聚合锆盐与传统聚合硫酸铁的脱稳絮凝效果,比较了固液分离性能等指标,揭示了聚合锆盐的脱稳絮凝机理。研究表明,聚合锆盐的最优的药剂配方与处理条件为:药剂碱化度为10%,药剂投加量为2.70%,搅拌速率为200 r·min^(−1),絮凝时间为60 s,絮凝温度为20~70℃。聚合锆盐对聚合物型废弃水基钻井液有良好的脱稳絮凝效果,脱液率可达75.1%,泥饼含水率低至34.17%,滤液浊度243 NTU。聚合锆盐对聚合物型废弃水基钻井液的脱稳絮凝机理为,聚合锆盐较强的电中和能力大幅降低了废弃钻井液固体颗粒的Zeta电位;同时,聚合锆盐水解形成的高分子无机聚合物,通过网捕卷扫作用,形成粒径较大的絮体颗粒,从而实现聚合物型废弃钻井液的高效固液分离。本研究为采用聚合锆盐脱稳絮凝聚合物型废弃水基钻井液提供了理论支撑和工艺参考。Polymer waste water-based drilling fluid exhibits extremely high stability and is difficult to achieve solid-liquid separation,which is a key bottleneck restricting its recycling in offshore oil fields.In this study,polymerized zirconium salt was employed to destabilize and flocculate water-based drilling fluid.The effects of various process parameters,including the alkalization degree of the agent,dosage,stirring speed,flocculation time and temperature,on the flocculation process were systematically investigated.The optimal reagent formulation and treatment conditions were determined.The destabilization and flocculation performance of polymeric zirconium salt were compared with those of traditional polymeric ferric sulfate,focusing on solidliquid separation efficiency and other performance metrics.The mechanism of destabilization and flocculation by polymeric zirconium salt was also elucidated.The results showed that the optimal formulation and treatment conditions for polymeric zirconium salt were as follows:an alkalization degree of 10%,a dosage of 2.70%,a stirring speed of 200 r·min^(−1),a flocculation time of 60 s,and a flocculation temperature of 20℃~70℃.Polymeric zirconium salt demonstrated excellent destabilization and flocculation performance for polymer-based waste water-based drilling fluids,achieving a dewatering rate of 75.1%,a mud cake water content as low as 34.17%,and a filtrate turbidity of 243 NTU.The destabilization and flocculation mechanism of polymeric zirconium salt involves its strong charge neutralization ability,which significantly reduces the Zeta potential of solid particles in the waste drilling fluid.Furthermore,the hydrolysis of polymeric zirconium salt generates high-molecular-weight inorganic polymers that form larger floc particles through a sweep flocculation mechanism,thereby enabling efficient solid-liquid separation.This study provides theoretical support and practical guidance for the use of polymeric zirconium salt in destabilizing and flocculating polymer-based wast

关 键 词：聚合锆盐 钻井液 聚合物型 脱稳絮凝 固液分离 

分 类 号：X703[环境科学与工程—环境工程]