INTERNATIONAL PATENT: PETROCHINA COMPANY LIMITED, 中国石油天然气股份有限公司, PETROCHINA COALBED METHANE COMPANY LIMITED, 中石油煤层气有限责任公司, ZHONGLIAN CBM STATE ENGINEERING RESEARCH CENTER COMPANY LIMITED, 中联煤层气国家工程研究中心有限责任公司 FILES APPLICATION FOR "METHOD FOR DETERMINING COLLAPSE PRESSURE IN DEEP COALBED METHANE HORIZONTAL WELL, APPARATUS, DEVICE AND STORAGE MEDIUM"

GENEVA, March 22 -- PETROCHINA COMPANY LIMITED (9 Dongzhimen North StreetDongcheng District, Beijing 100007), 中国石油天然气股份有限公司 (中国北京市东城区东直门北大街9号), PETROCHINA COALBED METHANE COMPANY LIMITED (Room 2366, Block B, No.9 (No.3 Building), Advanced Road, Science And Technology ParkChangping District, Beijing 102200), 中石油煤层气有限责任公司 (中国北京市昌平区科技园区超前路9号(3号楼...