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1.2 billion tons!

 Last Update: 2022-11-08
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On July 28, CNOOC announced that China's first offshore shale oil exploration well, Weiye-1 Well, was successfully fractured and obtained commercial oil flow, marking a major breakthrough in China's offshore shale oil exploration
.

Well Weiye-1 is located in the Weixinan Sag in the Beibu Gulf of the South China Sea, with a daily output of 20 cubic meters of crude oil and 1,589 cubic meters of natural gas with stable production capacity
.
According to estimates, the shale oil resources in the Weixinan Sag reach 800 million tons, and the shale oil resources in the entire Beibu Gulf Basin are about 1.
2 billion tons, showing good exploration prospects
.

It is understood that shale oil mainly refers to the petroleum resources distributed in the pores of shale formations.
It is a typical unconventional oil and gas, and it is also a strategic replacement field for conventional oil and gas
.
Compared with conventional oil and gas, shale oil has pores as small as nanometers, making it extremely difficult to produce
.

In the early exploration of offshore oil and gas resources, more than 60 wells of CNOOC encountered oil shale, but the exploration and development faced geological and engineering difficulties such as large burial depth, many fractures, difficult drilling, and small space for offshore platforms.
business development
.

In recent years, with the development of conventional oil and gas in old oilfields entering the middle and late stages, CNOOC has regarded unconventional oil and gas exploration and development as an important direction for resource replacement and stable production increase
.
Offshore shale oil exploration will be deployed in 2020, and the Weixinan Sag of Beibu Gulf will be taken as a strategic breakthrough point in 2021
.

The breakthrough in offshore shale oil exploration is an innovation from recognition to technology
.
According to Deng Yong, chief geologist of CNOOC Zhanjiang Branch, in the process of tackling key problems, the CNOOC project team innovated the exploration idea of "conventional and unconventional integration", repeatedly studied the characteristics of shale oil geological reservoirs in the southwest of Weinan, and conducted multiple rounds of exploration.
Demonstrate the feasibility of engineering and fracturing, and finally select the target area with good oil-bearing properties and good fracturing ability to deploy Well Weiye-1
.

According to the geological characteristics of the sandy strip of the fracturing layer in the target area, the project team adopted a special fracturing process of "high-low viscosity integrated seawater-based variable-viscosity fracturing system + restricted perforation + controlled pressure flowback" to release production capacity, and successively completed Two types of shale oil sections, interbedded and interbedded, were tested, and commercial discoveries were obtained
.

Xu Changgui, General Manager of the Exploration Department of CNOOC, said that the success of the first offshore shale oil was a major breakthrough in offshore oil and gas exploration.
The prelude to the exploration and development of unconventional oil and gas, with huge resource potential, has laid a solid resource foundation for firmly holding the energy job in our own hands
.

In the next step, CNOOC will take this well as a new starting point, use the production platform to carry out long-term test production operations, and at the same time promote the manufacture of mobile fracturing equipment for offshore shale oil, accelerate the construction of China's offshore shale oil exploration and development demonstration area, and make every effort to Guarantee national energy security
.

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