Status Quo and Development Suggestions of Key Drilling Technologies for Extra-Deep Wells in Shunbei Oil and Gas

In Shunbei Oil and Gas Field, abundant hydrocarbon resource is expected. However, the reservoirs are deeply buried, known as large depths, high pressures, and extremely high temperatures, making it widely recognized as the global forbidden zone for drilling and completion. Therefore, the exploration of a series of efficient drilling technologies tailored for the extra-deep wells in Shunbei Oil and Gas Field is desperately important in the efficient development of the oil and gas field. To address the major drilling challenges in Shunbei Oil and Gas Field, a series of efficient drilling technologies have been developed through years of technical research and practices, mainly including optimization design technology for casing program, stratified rate of penetration（ROP） increase technology for Paleozoic formations, wellbore reinforcement technology for complex formations, efficient leak prevention and well cementing technology for thief zone, efficient directional drilling technology for high-temperature reservoirs, and protection technology for fault-controlled reservoir. Through the advocation of geological and engineering integration and the intensive application of mature technologies, with the well depth increases year by year, the drilling duration has progressively shortened, ensuring the efficient exploration and profitable development of Shunbei Oil and Gas Field. It is suggested to continuously improve the capabilities of controlling multiple production zones with one well, safely drill through fractures, and dealing with engineering challenges related to abnormally high pressures. It is also necessary to intensify efforts in key core technologies research such as the temperature resistance of tools and materials and deepen research on fundamental theories, key technologies, and equipment development for 10 000-meter wells drilling and exploration, so as to advance the exploration and development of Shunbei Oil and Gas Field, ensure the safe completion of extra-deep wells, and continuously break through the “Chinese depth”.