China Oilfield Services Limited (COSL) has officially launched a project involving four high-performance jack-up drilling rigs.
On July 22, COSL issued a tender notice for basic design services for a project to build four high-performance jack-up drilling rigs. According to the tender notice, the main technical specifications of the four rigs are as follows:
Classification Notations: ★CSA Self-elevating Drilling Unit; HELDK; Lifting Appliance; MSER; AUT-0; Cyber Security (M, S[SL1]); G-EP (OIL1, RC, NEC1, RSC1, AFS, GPR); PSPC (B); i-Unit (M, E, I); IWS ★CSA: Main classification notation
Maximum operating water depth: 60.96 meters (200 feet), upgradeable to 121.92 meters (400 feet); length: approximately 70–72 meters; beam: approximately 68–71 meters; draft: approximately 835–9.5 meters; Pile leg length: approximately 108.5 meters (upgradable to approximately 166 meters); maximum drilling depth; cantilever beam coverage: 10,668 meters (35,000 feet); cantilever beam coverage: 75 feet longitudinally, ±15 feet to ±20 feet laterally.
Previously, on June 30, COSL’s board of directors had already reviewed and approved a resolution regarding the feasibility study for a project to build four high-performance jack-up drilling rigs. Information regarding the shipyards that will build the four rigs has not yet been disclosed.
According to reports, in addition to four jack-up drilling rigs, COSL will also invest in the construction of 59 oilfield service vessels of six different types; the feasibility study for this project was also approved by the COSL Board of Directors on June 30.
Official website information indicates that COSL is one of the world’s largest integrated oilfield service providers, offering services across all stages of offshore oil and gas exploration, development, and production. Its operations are divided into four major categories: geophysical survey services, drilling services, oilfield technical services, and vessel services.
COSL operates one of the most robust fleets of offshore oilfield service equipment in the Asia-Pacific region. It operates and manages a total of 13 geophysical survey vessels; 57 drilling rigs (including 36 jack-up drilling rigs, 12 semi-submersible drilling rigs, 3 accommodation platforms, and 6 modular drilling rigs); more than 130 offshore support vessels; and over 430 sets of advanced oilfield technical service equipment—including self-developed logging-while-drilling (LWD), rotary steering, and drilling systems—for logging, mud logging, directional drilling, cementing, and workover operations.
In 2025, COSL reported operating revenue of 50.28 billion yuan (approximately $7.426 billion), a year-over-year increase of 4.1%; total profit of 5.11 billion yuan (approximately $755 million), a year-over-year increase of 9.6%; and net profit of 4.06 billion yuan (approximately $600 million), a year-over-year increase of 19.4%, marking steady growth in operating performance. In the first quarter of 2026, COSL reported operating revenue of 11.30 billion yuan (approximately $1.669 billion), a year-over-year increase of 4.6%; total profit was 1.16 billion yuan (approximately $171 million), a year-over-year increase of 2.4%.