摘要
石油勘探开发过程中大量的废弃钻井泥浆会引起土壤、地表水和地下水的污染。选择长庆油田陕北采区区内5个井场的钻井泥浆进行研究,探索了石油钻井泥浆的处置对策。结果发现,物理方法很难直接从泥浆中分离出水。因此必须先破坏泥浆的胶体结构,使其失去稳定性,才能实现固液分离。为此提出了铁盐破胶,以粉煤灰、石灰为主凝固剂,外加黄土为辅料的泥浆固化处置技术。该技术处理泥浆的优化条件是:三氯化铁用量为0.6%,粉煤灰用量为25%,石灰用量为6%,黄土用量为40%。结果表明,采用该工艺处理废弃泥浆是行之有效的,使处理后水质各项指标均符合《综合污水排放标准》(GB 8978-1996)二级标准。
A large quantity of waste drilling fluid and drainage are yielded during the exploit and exploration procedure of natural gas. These wastes may pollute soil, ground water and surface water because of surface leakage and overflow. The north of Shaanxi Province, which is the oil production area of the Changqing Oil Field, was chosen as the study area. Analysis and study of waste drilling fluid were carried out in five different weli sites of the study area. The results indicate that it is hard to achieve solid-liquid separation with physical method. Therefore, in order to achieve solid-liquid separation, destruction of colloidal structure must be carried out to make waste drilling fluid lose stability above all. Therefore, the study put forward the solidification-after- gelout disposal technique for waste drilling fluid. Iron salts were chosen as gel breaker, fly ash and lime were chosen as curing agents and loess was chosen as supplementary materials. The optimum conditions were investigated and the results of experiment showed that when the content of FeCl3 is 0.6 percent, the content of fly ash is 25 percent, the content of lime is 6 percent and the content of loess is 40 percent of waste drilling fluids. The result showed that it is effective to use the technique for treating the waste drilling fluid. After the treatment, the quality of leaching solution reaches the second trade of wastewater discharge standard （GB 8978-1996）.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第9期1673-1676,共4页
Chinese Journal of Environmental Engineering
关键词
钻井废弃泥浆
处置对策
固化
粉煤灰
石灰
waste drilling fluids
disposal countermeasure
solidification
fly ash
lime
