China first offshore ultra-high temperature and ultra-high pressure gas field production platform is installed
2023-11-14 10:00China first offshore ultra-high temperature and ultra-high pressure gas field production platform is installed
On November 3, CNOOC announced that the offshore installation work of the Ledong 10-1 gas field production platform was successfully completed. The picture shows the upper block of the Ledong 10-1 gas field slowly moving toward the jacket recently.
Original title: China first offshore ultra-high temperature and ultra-high pressure gas field——
The Ledong 10-1 gas field production platform is installed
On November 3, CNOOC announced that as the upper part of the platform weighing more than 1,900 tons fell steadily on the jacket, the offshore installation of the Ledong 10-1 gas field production platform was successfully completed. This marks key progress in the development of my country's first offshore ultra-high temperature and ultra-high pressure gas field, and is of great significance to improving my country's offshore complex oil and gas resource development capabilities and ensuring national energy security.
The Ledong 10-1 gas field development project is located in the Yinggehai Basin in southern Hainan Island. The average operating water depth is about 90 meters. It was first discovered in 2015. The reservoir temperature of this gas field reaches as high as 214°C and the formation pressure reaches 94 MPa, which meets the standards of ultra-high temperature and ultra-high pressure gas fields and is the first offshore operation in China.
"This gas field is located in an area where the formation temperature and pressure conditions are extreme and there are many uncertainties. The development work is a huge challenge for us." Hoshi Changto, general manager of the Engineering Construction Center of CNOOC Hainan Branch, said that CNOOC is actively To explore a scientific and effective path to safely and economically develop offshore ultra-high temperature and ultra-high pressure gas reservoirs, the Ledong 10-1 gas field development project fully relies on the development and construction of existing oil and gas production facilities. It plans to build a new unmanned wellhead platform with 4 legs and 8 skirt piles, equipped with a specially designed The designed high-temperature and high-pressure oil and gas extraction equipment is connected to the central platform of the Ledong 22-1 gas field through submarine cables and gas pipelines to obtain power supply and oil and gas processing capabilities. The produced oil and gas will eventually be sent to Dongfang Terminal for processing and sales.
"The offshore installation operation of the platform is like building blocks, but it is necessary to ensure that the heavy lifting objects are accurately positioned and hit with one hit under the combined influence of ocean wind, waves and currents." CNOOC Ledong 10-1 Gas Field Yu Faling, chief engineer at the development project site, said that the platform consists of two parts: the jacket and the upper module, with a total weight of about 9,200 tons. Among them, the jacket is the "base", which was installed using the construction plan of "horizontal construction, dragging and loading, hoisting and launching, and water filling and righting". It was fixed in October; the upper part of the platform was laid by "Offshore Oil 201" The crane ship is hoisted to the top of the jacket and slowly lowered to complete the docking.
It is reported that the installation of the new platform in the Ledong 10-1 gas field is greatly affected by severe offshore weather and seafloor currents, and the weight and height of the jacket are close to the operating capacity limit of the crane ship. The CNOOC project team researched and formulated a five-level construction plan, optimized the construction technology, adopted the bow top flow operation mode to overcome the influence of ocean currents, and completed the jacket bottom placement within the 75-hour extreme operation window; at the same time, through real-time precise control of ship dynamics, Achieve precise closing of the upper module and jacket.
Jiang Ping, deputy general manager and chief engineer (development) of CNOOC Hainan Branch, said that the Ledong 10-1 gas field development project is an important practical exploration by CNOOC to promote the substantive development of offshore ultra-high temperature and ultra-high pressure oil and gas, and is expected to achieve many breakthroughs. It is of great significance to fully build a trillion-dollar atmospheric area and improve energy self-sufficiency.