my country's first offshore ultra-deep extended reach well project goes into production: daily production of 740 tons of light crude oil
Release time：2024-08-15click：3
According to the news on June 28, according to the official Weibo of "Haiyouluohao",the Enping 21-4 oilfield, the first offshore ultra-deep extended reach well project independently developed by my country, has been fully put into production in the Pearl River Mouth Basin, with daily production of light The quality crude oil can reach 740 tons.
It is reported that the Enping 21-4 oil field is located in the sea about 200 kilometers southwest of Shenzhen. It is located on the seabed with an average water depth of about 89 meters. It is a typical small oil field. Marginal sandstone fields. Despite its small size, its potential is fully unleashed through innovative mining techniques.
With the help of the Enping 20-5 unmanned platform 8 kilometers away, CNOOC successfully implemented the mining of two ultra-deep extended reach wells. The maximum depth of one of the wells reached an astonishing 9,508 meters, which not only broke the depth record of my country's offshore drilling, but also set a new record of horizontal length, demonstrating my country's outstanding strength in the field of offshore oil exploration.
A major feature of extended-reach well technology is that its trajectory is not vertically downward. Instead, after reaching a specific depth, it drills laterally to a predetermined position in a "turning" manner. Oil area.
In the Enping 21-4 oilfield project, the water-to-vertical ratio of the ultra-deep extended-reach well is as high as 4.43, which means that for every 1 meter of drilling down, it is necessary to drill horizontally Move nearly 4.5 meters. Such a technical challenge requires the drilling tool to travel underground for more than 8,000 meters in an almost "lying" position. The difficulty and risk can be imagined.
It is worth mentioning that the eastern part of the South my country Sea contains abundant oil and gas resources, with hundreds of oil and gas marginal structures. The successful application of extended-reach well technology not only brings the possibility of exploitation to these oil fields that were originally regarded as "tasteless", but also significantly reduces the exploitation cost, saving about 40% of investment expenses.
It is expected that this technology will help expand the reserves of marginal oil fields in the eastern South China Sea by more than 50 million tons, providing a strong guarantee for my country's energy security and economic development.
