1. School of Chemistry and Chemical Engineering Southwest Petroleum University Chengdu Sichuan 610500 P. R. China
2. Material Management Department Chuanqing Drilling Engineering Co. Ltd., CNPC Chengdu Sichuan 610500 P. R. China
3. China Petroleum Engineering & Construction Corporation Southwest Company Chengdu Sichuan 610041 P. R. China
4. Industrial Hazardous Waste Disposal and Resource Utilization Research Institute Southwest Petroleum University Chengdu Sichuan 610500 P. R. China