China's first deep-water high temperature and pressure exploration drilled

It is learned from CNOOC that the first deep-water high-temperature and high-pressure exploration well-Lingshui 25-1S-1 drilled by "Offshore Oil 981" successfully drilled well.

This well is CNOOC's Nanhai Western Petroleum Administration. Following the discovery of China's first ultra-billion cubic meter self-supporting deep-water gas field in the South China Sea last year, 17-2, another important exploratory well in the South China Sea was discovered to further prove South China Sea natural gas reserves.

The successful completion of the well shows that our country has overcome a series of problems and will vigorously promote the development of oil and gas resources in the South China Sea. It is of great significance to the construction of the South China Sea's atmospheric region and the protection of China's energy security.

Xie Yuhong, director of the South China Sea Western Bureau of Petroleum Administration, said: "At sea, HPHT drilling is a world-class challenge. It faces a depth of 1,000 meters and a depth of 4,000 meters. Due to multiple factors, drilling costs are extremely high and the risks are greater. The required technical difficulty is even higher. "However, the resources of China's South China Sea under deep-sea high-temperature and high-pressure conditions account for about half of the resources in South China Sea. After analyzing the geological data, if there is resources to be exploitable, more exploration wells will be deployed in the next step.

Internationally, the current vertical distance from the water surface to the seabed of 500 meters or more is called deep water, and the depth of 1,500 meters is ultra-deep water. In recent years, 50% of the major exploration discoveries that have been made globally come from the oceans, mainly deep water. China's South China Sea is rich in oil and gas resources, of which 70% is in the deep sea.

In view of the drilling risk caused by high temperature and high pressure, CNOOC Ltd. has developed a multi-mechanism formation pressure prediction technology to analyze wellhead stability, check formation pressure and working window, and solved a series of technical problems such as deep-water high temperature and high pressure drilling fluid and cementing.

According to reports, the first exploration of deep-water high-temperature and high-pressure exploration wells victory, validated CNOOC exploration in deep water, high temperature and pressure and other special areas. Nearly 20 years of exploration and technology accumulation have taken place from drilling deep wells to drilling deep-water high-temperature and high-pressure wells in China. CNOOC has only made progress from drilling deep water wells in block 17-2 of Lingshui to deepwater high-temperature and high-pressure areas nowadays, foreign. (Reporter Huang Xiaofang)

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