一种页岩气井油基钻屑浸取处理技术  

An oil-based drilling cuttings leaching treatment technology for shale gas well

作　　者：班国 BAN Guo(Sinopec Jianghan Petroleum Engineering Co.,Ltd.,Qianjiang 433100,China)

机构地区：[1]中石化江汉石油工程有限公司,湖北潜江433100

出　　处：《化学工程师》2022年第5期46-49,共4页Chemical Engineer

基　　金：国家科技重大专项“涪陵页岩气水平井钻井液与固井技术研究”(No.2016ZX05060-015)。

摘　　要：四川盆地的涪陵、威远、长宁、威荣等页岩气田的勘探与开发一般使用油基钻井液作业,产生了大量的含油钻屑,含油钻屑处理不当不仅浪费资源还会对环境产生严重危害。以较高含油率(20%以上)的油基钻屑为研究对象,采用溶剂浸取法处理油基钻屑,研究出一种适用于四川页岩气井油基钻屑的新型高效浸取剂体系。新型高效浸取剂体系主要由高效聚醚除油溶剂 PDS- 2、高效阴离子表面活性剂 AST- 1 和润湿反转剂WRA- 5 组成,优化处理油基钻屑的工艺条件,并对其除油效率进行评价。实验结果表明,当固液比为 1∶5,实验温度为 40℃,搅拌速度为 250r·min^(-1),搅拌时间为 8min 时,新型高效浸取剂的除油效率较高,一次浸取处理除油效率在 90%以上,二次浸取处理除油效率 99%以上,满足直接排放标准。Oil based drilling fluid is generally used in the exploration and development of shale gas fields such as Fuling,Weiyuan,Changning and Weirong in Sichuan Basin,resulting in a large amount of oil-bearing drilling cuttings.Improper treatment of oil-bearing drilling cuttings not only wastes resources,but also causes serious harm to the environment.Taking the oil-based drilling cuttings with high oil content (more than 20%) as the research object,a new leaching agent system suitable for oil-based drilling cuttings of Sichuan shale gas well is developed by using solvent leaching method to treat oil-based drilling cuttings.The new leaching agent system is mainly com -posed of high-efficiency polyether degreasing solvent PDS-2,high-efficiency anionic surfactant AST-1 and wetting reversal agent WRA -5.The process conditions for treating oil -based drilling cuttings are optimized,and its de -greasing efficiency is evaluated.The experimental results showed that when the solid-liquid ratio is 1∶5,the experimental temperature is 40℃,the stirring speed is 250r·min^(-1) and the stirring time is 8 min,the oil removal efficiency of the new leaching agent is higher,the oil removal efficiency of primary leaching treatment is more than 90%,and the oil removal efficiency of secondary leaching treatment is more than 99%,which meets the direct emission standard.

关 键 词：页岩气井 油基钻屑 新型浸取剂体系 除油效率 

分 类 号：TE254[石油与天然气工程—油气井工程]