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《Chinese Journal of Environmental Engineering》 2009-09
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Disposal countermeasure of waste drilling fluids in loess region

Dong Yawei1,2 Wang Wenke2 Yang Shengke2 Li Yangyang1 Li Qi2 Lü Jing1 Zhang Jiayin1(1.Shaanxi Environmental Monitoring Center,Xi'an 710061,China;2.Environmental Science and Engineering College,Chang'an University,Xi'an 710054,China)  
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 well 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 grade of wastewater discharge standard(GB 8978-1996).
【CateGory Index】: X741
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