CNOOC Petroleum Service has obtained patents related to controllable source density calibration, enabling controllable source density mud correction and reducing cost difficulty.

March 25 News: Information from the National Intellectual Property Administration shows that China National Offshore Oilfield Service Co., Ltd. has applied for a patent titled “Controllable Source Density Mud Quality Correction Method, Apparatus, Equipment, Medium, and Product,” with the authorized publication number CN121500438B and the authorization announcement date of March 24, 2026. The application publication number is CN121500438A, the application number is CN202610047590.6, the application publication date is March 24, 2026, the application date is January 14, 2026, and the inventors are Wang Meng, Zhou Yue, Dong Yu, Liu Haibo, Zhou Quan, Gao Yongde, Wu Lejun, Cheng Jiajie, and Yin Lu. The patent代理机构 is Beijing Haotian Intellectual Property Agency Co., Ltd. (General Partnership), the patent agent is Liang Qian. Classification numbers are G01V13/00, E21B49/00, G01V5/12, G06F30/20, and G06F111/10.

The patent abstract indicates that this invention discloses a controllable source density mud quality correction method, apparatus, equipment, medium, and product, related to the field of oil and gas development. The method includes: based on controllable source density logging response simulation data under conditions of different mud mineral types and mud content, calculating formation apparent density, and calculating controllable source density measurement errors under conditions of different mud mineral types and mud content; using natural gamma information to characterize mud content, and using thermal neutron capture cross-section to characterize mud mineral types, analyzing target association relationships among controllable source density measurement error, thermal neutron capture cross-section, mud content, and formation apparent density to form a mud quality correction model; substituting the target formation’s natural gamma information and thermal neutron capture cross-section into the mud quality correction model to obtain a mud quality correction quantity, thereby correcting the controllable source density measurement results. This invention eliminates the dependence of controllable source density logging on elemental logging information, reducing implementation difficulty and cost.

China National Offshore Oilfield Service Co., Ltd. was established on December 25, 2001, and listed on the Shanghai Stock Exchange on September 28, 2007. Its registered address is Tianjin, and its office address is in Hebei. It is a leading domestic integrated oilfield service provider, with business covering the entire process of oil and gas exploration and development, and it has advantages in full industrial-chain services.

The Shenwan industry classification for China National Offshore Oilfield Service Co., Ltd. is Oil & Petrochemicals - Oilfield Service Engineering - Oilfield Services. It involves concept sector themes such as oil and gas reform, shale gas, and combustible ice. Its principal business covers each stage of oil and gas exploration, development, and production, and is mainly divided into four major segments: drilling services, oilfield technology services, vessel services, and geophysical exploration survey services.

In 2025, China National Offshore Oilfield Service’s operating revenue reached RMB 50.28B, ranking 3rd among 3 companies in the industry. The industry leader, Sinopec Oilfield Service, had RMB 80.71B, the 2nd-place company, CNOOC Development, had RMB 50.36B, the industry average was RMB 60.45B, and the median was RMB 50.36B. In terms of business composition, oilfield technology services accounted for RMB 27.49B (54.68%); drilling services accounted for RMB 14.9B (29.63%); vessel services accounted for RMB 5.2B (10.34%); and geophysical acquisition and engineering exploration services accounted for RMB 2.69B (5.36%). As for net profit, in 2025 it reached RMB 4.06 billion, ranking 1st among 3 companies in the industry. The industry second-place company, CNOOC Development, had RMB 3.98B, the industry average was RMB 2.9B, and the median was RMB 3.98B.

China National Offshore Oilfield Service Co., Ltd.’s recent patent situation is as follows:

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