INTERNATIONAL PATENT: PETROCHINA COMPANY LIMITED, 中国石油天然气股份有限公司, CHINA NATIONAL OIL AND GAS EXPLORATION AND DEVELOPMENT COMPANY LTD., 中国石油国际勘探开发有限公司 FILES APPLICATION FOR "METHOD AND SYSTEM FOR PREDICTING MAXIMUM HORIZONTAL PRINCIPAL STRESS OF SHALE GAS RESERVOIRS"

GENEVA, June 23 -- PETROCHINA COMPANY LIMITED (9 Dongzhimen North Street,Dongcheng 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), CHINA NATIONAL OIL AND GAS EXPLORATION AND DEVELOPMENT COMPANY LTD. (Building D, International Investment BuildingNo. 6-1 Fuchengmen North Street,Xicheng District, Beijing 100034), 中国石油国际勘探开发有限公司 (中国北京市西城区阜成门北大街6-1...