The world's first offshore super-heavy oil field starts production

It is reported that on April 23, the first phase of CNOOC Lvda 5-2 North Oilfield, the world's first large-scale offshore thermal recovery and development oilfield for super-heavy oil, was successfully put into production
.
The successful application of the "thermal recovery of heavy oil" development model will stimulate the development of 100 million tons of super-heavy oil resources like "black amber" in the Bohai Bay Basin
.

Zhang Chunsheng, deputy general manager of CNOOC Tianjin Branch, said that with the completion and commissioning of the first phase of Lvda 5-2 North Oilfield project, Bohai Oilfield has formed a thermal recovery technology system for steam huff and puff for ultra-heavy oil horizontal wells, and some of the results have reached the international advanced level.

.
In the future, CNOOC will continue to increase the development and exploitation of offshore heavy oil resources, effectively increase the strategic oil reserves, and continue to contribute CNOOC's strength to ensure national energy security
.

According to reports, Lvda 5-2 North Oilfield is located in the Liaodong Bay waters of the Bohai Sea.
It is unconventional heavy oil with an average water depth of about 32 meters
.
Heavy oil is a kind of crude oil with high density, high viscosity, poor fluidity and easy solidification
.
The viscosity of crude oil in the formation of Lvda 5-2 North Oilfield is more than 20 times that of the thickest crude oil developed in the Bohai Sea, and it cannot flow at room temperature
.

At present, the proven reserves of unconventional heavy oil in the Bohai Oilfield exceed 600 million tons, accounting for 14.
5% of the total proven geological reserves in the Bohai Sea.
Awakening this part of the dormant underground resources will provide important support for the Bohai Oilfield to increase production by 40 million tons
.
However, compared with land, the development of offshore heavy oil is much more difficult
.

According to Wang Benwu, Deputy General Manager of Liaodong Operation Company, in order to effectively utilize this part of the extra-heavy oil reserves and find a "good recipe" suitable for efficient thermal recovery development under the condition of large well spacing offshore, CNOOC has carried out program design and mechanism characterization.
A series of researches such as effect evaluation and replacement technology have successively overcome world-class problems such as high-temperature injection-production integration, downhole high-temperature safety control, etc.
, and innovatively put forward a heat injection scheme of progressive preheating formations, which is an important source for Luda 5-2 North Oilfield.
The first phase of the project has laid the foundation for the rapid development of ultra-heavy oil
.

In order to achieve breakthroughs in the large-scale and economic development of ultra-heavy oil, in recent years, CNOOC has also developed technologies for offshore heavy oil thermal recovery such as wellhead lift control, downhole high-temperature-resistant tools, integrated pipe strings, and steam injection technology.
system
.

In addition, the development of this oilfield is guided by the concept of "three new and three modernizations".
On the premise of ensuring intrinsic safety, key equipment such as steam boilers and central control systems are all localized.
Requirements, the introduction of the largest volume of domestically produced steam boilers at sea with mature technology
.
In view of the continuous risk of high temperature and high pressure in the steam injection process, the platform is equipped with advanced steam leakage monitoring devices and remote monitoring devices such as wellhead uplift monitoring, which greatly reduces the exposure time of staff in high temperature and high pressure areas and greatly improves the ultra-high viscosity.
Oil extraction safety factor
.