Keeping the deepwater blowout prevention and control line-remembering the key technology and equipment of ocean deepwater drilling well control in the second prize of the 2020 National Technology Invention Award Project

In the vast seas of our country, there is a code to unlock the treasures of deep-water oil reservoirs

The safety of deepwater drilling well control is a worldwide problem recognized by the industry

The main participant of the project, Dr.

The first is to create a "supercritical-gas-liquid-solid (hydrate)" four-phase flow deep-water well control theoretical model, using the invented full-scale deep-water wellbore flow simulation experimental device and field application data to verify that it is in line with the international general classics.

The second is the research and development of the early monitoring method of downhole gas invasion based on the principle of non-volume expansion, which reveals the temperature, pressure, sound, electrical, and gamma response characteristics of the drilling fluid after bottom hole gas intrusion, and developed an early gas invasion based on multi-source information fusion Monitoring equipment, developed a blowout early warning pattern recognition expert system based on comprehensive logging information on the sea surface, realized intrusion and discovery, and won precious time for the kill operation that counts against every second

The third is to invent the "dynamic kill drilling" well control equipment that can realize the automatic control of the wellbore annulus pressure, establish a real-time inversion method for formation pressure, and develop a dynamic adjustment device for drilling fluid density.

Since the project results were applied in self-operated deepwater projects in 2011, they have been applied to many deepwater oil and gas fields at home and abroad

According to Li Zhong, Deputy General Manager of CNOOC Research Institute Co.