环境工程学报2025，Vol.19Issue(1)：152-159,8.DOI:10.12030/j.cjee.202407094
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
摘要
Abstract
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 solid-liquid 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 waste water-based drilling fluids.关键词
聚合锆盐/钻井液/聚合物型/脱稳絮凝/固液分离Key words
polymerized zirconium salt/drilling fluid/polymer/destabilizing flocculation/solid-liquid separation分类
环境科学引用本文复制引用
李斌,韩超,严海源,郭晓轩,刘旭,岳明,王恩全,孔令昊..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[J].环境工程学报,2025,19(1):152-159,8.基金项目
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) （KJGG-2022-17）
