Tianjin Completes Installation of HZ25-8B Drilling and Production Platform's Topsides

Strategic Insights -

The Tianjin-based state-owned enterprise Offshore Oil Engineering Co., Ltd. (COOEC) has completed the offshore installation of the HZ25-8B drilling and production platform's topsides, a milestone achievement in the HZ25-8 oilfield comprehensive adjustment project. The topsides, with a projected area exceeding 8.5 standard basketball courts and weighing 14,370 tons, will enable the commissioning of the project, which will connect existing developed oilfields, forming an industrial cluster and promoting the coordinated development of the offshore energy industry chain. This achievement is significant not only for the oilfield comprehensive adjustment project but also for national energy security.

Key Takeaways:

  • The HZ25-8B drilling and production platform's topsides have a projected area exceeding 8.5 standard basketball courts and weigh 14,370 tons.
  • The project will connect existing developed oilfields, forming an industrial cluster and promoting the coordinated development of the offshore energy industry chain.
  • The HZ25-8B drilling and production platform is innovatively equipped with CNOOC's first produced water waste heat power generation unit, which recycles associated gas while utilizing the waste heat from the micro-turbine flue gas for refrigeration.
  • The float-over method used for installation utilized the natural forces of tides and ship load adjustments, requiring dynamic adjustments by the installation team.
  • The construction team monitored weather conditions in real-time and leveraged high-powered tugboats and fully revolving port tugboats to ensure accurate docking of the module tip and jacket.
  • The welders completed the entire platform installation process in approximately 48 hours, using over 232 kilometers of welding consumables.
  • The installation of the HZ25-8B drilling and production platform's topsides paves the way for the commissioning of the HZ25-8 oilfield comprehensive adjustment project.
  • As a core facility in the project, the HZ25-8B drilling and production platform is designed to efficiently recycle associated gas and utilize waste heat from the micro-turbine flue gas for refrigeration.

Statistics:

  • The HZ25-8B drilling and production platform's topsides have a projected area exceeding 8.5 standard basketball courts (approximately 12,625 square meters).
  • The topsides weigh 14,370 tons.
  • The project estimates a reduction of approximately 11,800 tons of carbon dioxide emissions annually.
  • The construction team used over 232 kilometers of welding consumables during the installation process.
  • The entire platform installation process was completed in approximately 48 hours.
  • The installation required dynamic adjustments by the installation team to utilize the natural forces of tides and ship load adjustments.

Sources:

  • https://www.tj.gov.cn/sy/tjxw/202510/t20251011_7150967.html