GENEVA, March 22 -- DAQING OILFIELD COMPANY LIMITED (Longnan, Ranghulu DistrictDaqing, Heilongjiang 163002), 大庆油田有限责任公司 (中国黑龙江省大庆市让胡路区龙南), 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) filed a patent application (PCT/CN2024/143419) for "IN-SITU VISUAL DETECTION METHOD AND APPARATUS FOR SHALE OIL CONTE...