Repeated breakthroughs have been made in oil and gas exploration to enhance China's ability to guarantee strategic mineral resources

Recently, China's shale gas ultra-long horizontal well drilling has made a major breakthrough, and the first drilling of Fuling shale gas field in Sinopec Jianghan Oilfield has been successfully completed, with a drilling depth of 7161 meters
.
Among them, the horizontal section is 4286 meters long, and the horizontal section "one pass drilling" advance is 4225 meters, setting two new records
for the longest horizontal section of shale gas wells and the longest "one drilling" advance in the horizontal section.

Shale gas is an unconventional gas reservoir, also known as an "artificial gas reservoir", which needs to be crushed to get the gas out, which is recognized as a world-class problem
in the industry.
Preliminary exploration shows that China's shale gas recoverable resources reach 21.
8 trillion cubic meters, ranking first in the world, and the output is second only to the United States and second
in the world.
In the current context of soaring global natural gas prices and tight supply, technological breakthroughs in shale gas extraction have attracted much attention
.

Ultra-long horizontal wells refer to horizontal wells with a horizontal section length of more than 3000 meters, which are difficult to achieve in mountain shale gas drilling because of many technical problems such as the difficulty of carrying rock cuttings, complex force on drilling tools, and high risk of collapse of the well wall, which has always been a difficulty in the efficient development of
shale gas in China.
As a national shale gas demonstration area, Fuling shale gas field has made every effort to tackle shale gas ultra-long horizontal well drilling technology, and has taken the lead in realizing ultra-long horizontal well drilling of shale gas above 3,000 meters in China
.

Not long ago, Sinopec announced that a exploration well deployed in the Sichuan Basin has obtained a high-yield and stable industrial airflow, with a daily output of 258,600 cubic meters of natural gas and an evaluation of 387.
8 billion cubic meters of geological resources, which is the first major breakthrough
in shale gas exploration in the formation of the Cambrian Xiaozhusi Formation.

It is said that the Cambrian Xiaozhusi Formation is the most promising marine shale gas exploration target
in China in the future.
This breakthrough will help the construction of a national natural gas (shale gas) production capacity base of
100 billion cubic meters in Sichuan-Chongqing region.

Also in October, CNOOC announced that it had made another major breakthrough in exploration in the southeastern Qiongdongnan Basin of the southeastern part of Hainan Island, discovered China's first deep-water deep atmospheric field Baodao 21-1, with proven geological reserves of more than 50 billion cubic meters, achieving the largest breakthrough in the Songnan-Baodao sag in more than half a century, and is a powerful progress
in accelerating deep-sea deep exploration.

In the field of offshore oil and gas exploration, water with a depth of more than 300 meters is generally called deep water, and wells with a depth of more than 3,500 meters are defined as deep wells
.
The Baodao 21-1 gas field discovered this time is located in the deep water area of the southeast of Hainan Island, with a maximum operating water depth of more than 1,500 meters and a completed drilling depth of more than 5,000 meters, about 150 kilometers away from the "Shenhai No.
1" ultra-deepwater atmospheric field, and the marine geological conditions are extremely complex
.

In recent years, CNOOC researchers have found that Baodao 21-1 has the tectonic background of large delta development, most likely a large and medium-sized gas field
.
The first deployed pre-exploration well drilled 113 meters of gas reservoir, setting a record
for the thickest gas layer in a single well in deep water.
After testing, the daily production of natural gas is 587,000 cubic meters
.
The proven geological reserves of natural gas exceeded 50 billion cubic meters, and the proved geological reserves of condensate exceeded 3 million cubic meters
.

Wu Keqiang, chief geologist of CNOOC Hainan Branch, said that as the formation deepens, the quality of basic data will deteriorate, the difficulty of reservoir prediction, gas content analysis and structural implementation will increase exponentially, and the difficulty of drilling will also increase
significantly.
The successful discovery of Baodao 21-1 not only confirms the exploration potential of the Baodao sake, but also shows that we have made important breakthroughs in deepwater deep exploration technology, which has important guiding significance
for the exploration of similar strata.

An important driving factor for these breakthroughs and discoveries is that in the context of energy security, China has increased its geological prospecting efforts
.
In September, at the press conference on the development and achievements of natural resources in the new era of the Propaganda Department of the CPC Central Committee, Yu Haifeng, director of the Department of Geological Exploration and Management of the Ministry of Natural Resources, said that a new round of strategic actions for breakthroughs in prospecting will be organized and implemented, highlighting the shortage of strategic resources, strengthening basic geological work, increasing the intensity of prospecting, especially precise investigation, giving full play to the role of various market entities, and effectively enhancing China's strategic mineral resources guarantee capacity
.

Since 2011, the Ministry of Natural Resources has organized the implementation of the strategic action
of breakthrough in prospecting.
In the past 10 years, China has formed a number of important mineral resources strategic succession areas, under the condition of continuous increase in exploitation consumption, the amount of major mineral resources has generally increased, including the new discovery of oil and natural gas 23 large oil fields of 100 million tons and 28 hundred billion square meters of gas fields, and the formation of 32 new resource bases for non-oil and gas minerals
.
(Huang Xiaofang)