新型抑制剂对高密度废钻井液中重晶石浮选行为及机理研究  

Study on the Flotation Behavior of Barite in High-density Waste Drilling Fluid by a Novel Inhibitor

作　　者：夏宇 谢水祥 许毓 唐善法[1,2] 王多琪 李晓煜 程远鹏[1,2] XIA Yu;XIE Shuixiang;XU Yu;TANG Shanfa;WANG Duoqi;LI Xiaoyu;CHENG Yuanpeng(School of Petroleum Engineering,Yangtze University,Wuhan 430100,China;Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering(Yangtze University),Wuhan 430100,China;State Key Laboratory of Petroleum Pollution Control,Beijing 102206,China;CNPC Research Institute of Safety and Environmental Technology Co.,Ltd,.Beijing 102206,China)

机构地区：[1]长江大学石油工程学院,武汉430100 [2]油气钻采工程湖北省重点实验室(长江大学),武汉430100 [3]石油石化污染物控制与处理国家重点实验室,北京102206 [4]中国石油集团安全环保技术研究院有限公司,北京102206

出　　处：《有色金属工程》2023年第10期74-81,共8页Nonferrous Metals Engineering

基　　金：中国石油战略性前瞻性重大科技项目(2021DJ6601)。

摘　　要：为提升油气井高密度废钻井液中重晶石回收率,以川南地区页岩气井离心机排渣口高密度废钻井液为研究对象,采用反浮选工艺脱除低密度固相,研究了新型抑制剂结冷胶对高密度废钻井液中重晶石与低密度固相浮选行为的影响,设计了相应的回用工艺,通过润湿性测试及Zeta电位测试探究了相应的作用机理。结果表明,采用“一粗二精一扫”浮选工艺,十二烷基硫酸钠用量为700 g/t、结冷胶用量为700 g/t,可得到综合回收率为86.49%、综合品位≥90%、混合精矿密度≥4.2 g/cm^(3)的重晶石精矿。润湿性及Zeta电位测试分析表明:结冷胶与重晶石之间以氢键形式进行吸附,并可阻碍后续十二烷基硫酸钠的吸附,而对低密度固相几乎不发生吸附,改善了重晶石与低密度固相亲疏水性而最终分离。研究可为油气田废钻井液处理及污水有效回用提供新思路。In order to improve the recovery rate of barite in high-density waste drilling fluid from oil and gas wells,the high-density waste drilling fluid from the centrifuge discharge of shale gas wells in the southern Sichuan area was used as the research object,and the low-density solid phase was removed by the reverse flotation process,and the effect of the new inhibitor junction cold gel on the flotation behavior of barite and low-density solid phase in high-density waste drilling fluid was studied.The corresponding mechanism of action was investigated by wettability and zeta potential tests.The results showed that the flotation process of“one roughing,two cleaning and one scavenging”with the dosage of 700 g/t of sodium dodecyl sulfate and 700 g/t of junction cold gum could obtain a barite concentrate with a combined recovery of 84.99%,a combined grade of≥95%and a barite density of≥4.2 g/cm^(3).Wettability and zeta potential test analysis showed that the adsorption between gellan gum and barite was carried out in the form of hydrogen bonding,and could hinder the subsequent adsorption of sodium dodecyl sulfate,while the adsorption of low-density solid phase almost did not occur,improving the hydrophilicity of barite and low-density solid phase and the final separation.

关 键 词：重晶石 反浮选法 低密度固相 机理分析 

分 类 号：TD923[矿业工程—选矿]