INTERNATIONAL PATENT: CHINA PETROLEUM & CHEMICAL CORPORATION, 中国石油化工股份有限公司, SINOPEC PETROLEUM ENGINEERING TECHNOLOGY RESEARCH INSTITUTE CO., LTD, 中石化石油工程技术研究院有限公司 FILES APPLICATION FOR "PLUGGING AGENT AND OIL-BASED DRILLING FLUID AND USE THEREOF"

GENEVA, Dec. 21 -- CHINA PETROLEUM & CHEMICAL CORPORATION (No.22 Chaoyangmen North Street,Chaoyang District, Beijing 100728), 中国石油化工股份有限公司 (中国北京市朝阳区朝阳门北大街22号), SINOPEC PETROLEUM ENGINEERING TECHNOLOGY RESEARCH INSTITUTE CO., LTD (No.197 Baisha Road, Shahe County,Changping District, Beijing 102206), 中石化石油工程技术研究院有限公司 (中国北京市昌平区沙河镇百沙路197号) filed ...