摘要
电吸附对废弃水基钻井液中的微小劣质固相具有选择性去除作用,能有效提高处理后钻井液的性能和回用率,但有关作用机理尚未明确。为此,采用激光粒度仪、环境扫描电子显微镜、比表面与孔隙度分析仪等分析设备对实验材料进行表征,结合废弃钻井液的特性,研究了电吸附法再生处理废弃钻井液时固相颗粒吸附的主要作用力、电吸附对固相颗粒的吸附范围及选择性、极板表面电荷对吸附效果的影响等作用机理。研究结果表明:①固相颗粒吸附主要依靠电场力的作用,极板材料本身的表面特性对于废弃钻井液中固相颗粒的吸附作用影响有限;②极板材料在废弃钻井液中时,其表面天然带负电荷,但不会影响电吸附的处理效果;③电吸附对废弃钻井液中粒度小于10μm的钻屑吸附效果好,而对粒度在0.1μm以下的固相颗粒吸附有限;④预处理后的废弃钻井液和电吸附分离出的固相颗粒的矿物种类和成分相同,电吸附对固相颗粒的类型没有选择性。结论认为,电吸附再生废弃水基钻井液是电吸附与微弱电解反应共同作用的结果,在电极板捕获、粘附、包被悬浮着的固相颗粒的同时,正极发生的微弱电解反应使废弃钻井液中的大分子聚合物部分氧化断链,促使劣质固相含量和黏度均大幅度降低。
Electrosorption has a selective removal effect on the tiny inferior solid phase in the waste water-based drilling fluid, so the performance and the reuse rate of drilling fluids after treatment can be effectively improved. However, such a mechanism has not yet been clarified. In view of this, the experimental materials were characterized using laser particle size analyzer, environmental scanning electron microscope, specific surface and porosity analyzer and X-ray diffractometer, and in combination with the features of waste drilling fluids, laboratory studies were carried out on the main force of solid particle adsorption, adsorption range and selectivity of solid particles by electrosorption, adsorption effect of surface charge on electrode plate. The following findings were obtained.(1) Solid phase particle adsorption mainly relies on the electric field force while the effect of the surface properties of the plate material itself is limited on the adsorption of solid phase particles in waste drilling fluids.(2) When the plate material is in the waste drilling fluids, the surface naturally carrying with a negative charge will not affect the treatment effect of electrosorption.(3) Electrosorption has a good adsorption effect on such drill cuttings with particle size less than 10 μm in waste drilling fluids, but not on those solid particles less than 0.1 μm. No difference was found in mineral types and components of the solid-phase particles separated either from the pre-treatment or from the electrosorption treatment of the waste drilling fluids, which proves that electrosorption has no selectivity for the type of solid particles. In conclusion, electrosorption recycled waste water based drilling fluids is realized by the interaction of electrosorption and weak electrolysis reaction. The macromolecular polymer in the waste drilling fluids is partially oxidized and broken by the electrode plate to capture, adhere, and coat the suspended solid phase particles, and interacted with the weak electrolytic reaction,
作者
谢水祥
任雯
李兴春
汤超
仝坤
孙静文
张明栋
刘晓辉
Xie Shuixiang;Ren Wen;Li Xingchun;Tang Chao;Tong Kun;Sun Jingwen;Zhang Mingdong;Liu Xiaohui(State Key Laboratory of Petroleum Pollution Control,Beijing 102206,China;CNPC Research Institute of Safety and Environmental Technology,Beijing 102206,China;Chongqing Water Conservancy&Electric Power Vocational and Technical College,Chongqing 402160,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2019年第12期139-145,共7页
Natural Gas Industry
基金
国家科技重大专项子课题“废弃物处理与利用技术”（编号：2016ZX05040-003）
中国石油天然气集团有限公司科学研究与技术开发项目“水基钻井废弃物循环利用及资源化技术研究与示范应用”（编号：2016E-1203）
关键词
废弃水基钻井液
再生处理
电吸附
机理
选择性
降黏度
固相颗粒
粒度
电解反应
Waste water-based drilling fluid
Regeneration
Electrosorption
Mechanism
Selectivity
Viscosity reduction
Solid particle
Particle size
Electrolysis reaction
