CNOOC Development Engineering Technology Branch and CNOOC Development have obtained patents related to underwater low-pressure wellheads. The integrated underwater low-pressure wellhead re-connection function reduces operational difficulty.

On March 29, news reported that the National Intellectual Property Administration’s information indicates that CNOOC Energy Development Co., Ltd. Engineering Technology Branch and CNOOC Energy Development Co., Ltd. applied for a patent named “An Integrated Underwater Low-Pressure Wellhead,” with authorization announcement number CN121273257B. The authorization announcement date is March 27, 2026. The application publication number is CN121273257A, the application number is CN202511846596.1, the application publication date is March 27, 2026, and the application date is December 9, 2025. The inventors include Tong Wujun, Li Jian, Zhao Weiqing, Jiang Yongyi, Jiang Zedong, Ju Shaodong, and Zhao De. The patent agency is Tianjin Shangyi Intellectual Property Agency (General Partnership), and the patent agent is Ma Qian, with classification numbers E21B33/035 and E21B33/038.

The patent summary shows that the invention discloses an integrated underwater low-pressure wellhead, which includes a low-pressure wellhead connection part, a low-pressure wellhead functional part, and a low-pressure wellhead casing connection part. The inner wall of the low-pressure wellhead connection part forms a tool guiding slope, a limiting structure, and an installation tool connection structure. The low-pressure wellhead functional part includes a low-pressure wellhead reconnection section, an installation limiting section, and a connection transition section. The outer wall of the low-pressure wellhead reconnection section forms multiple guiding keys, and the inner wall forms a reconnection joint limiting groove. The outer wall of the installation limiting section forms multiple bolt holes and a guiding base limiting groove. The inner wall of the installation limiting section forms a service tool sealing groove and a high-pressure wellhead bearing ring. This invention has a reconnection function, improving adaptability to operations with self-elevating platforms; the reconnection tools and low-pressure wellhead reconnection only require downward pressure and lifting, without the need for rotation, which lowers the requirements for the inclination angle of the low-pressure wellhead and the positioning accuracy of the platform, thus reducing operational difficulty; the connection between the guiding base and the low-pressure wellhead is quick and reliable, and the heading adjustment of the guiding base is convenient.

According to Tianyancha data, CNOOC Energy Development Co., Ltd. Engineering Technology Branch was established on December 13, 2001, with Wei Longgui as the legal representative. It belongs to the professional technical service industry, with registered capital and paid-in capital, and the registered address is in the East of the New Port Tide Barrier, Tanggu, Binhai New Area, Tianjin. CNOOC Energy Development Co., Ltd. Engineering Technology Branch has invested in 0 enterprises, participated in 5,389 bidding projects, and has 308 trademark information and 131 patent information regarding property clues, with 73 administrative licenses.

The recent patent situation of CNOOC Energy Development Co., Ltd. Engineering Technology Branch is as follows:

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Editor: Xiao Lang Kuai Bao