LI Jing1, WANG Ke-Liang1, LI Zhi1, CHEN Ding-Mei1, LIAN Ming-Lei1, YE Kun2
1. College of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004, China;
2. North China Company, China Petroleum Engineering Co., Ltd., Renqiu 062552, China