Status and development trend of coring technology for deep continental scientific drilling

Abstract:

To meet the development requirements of coring technology for 10000-meter ultra-deep drilling， this paper systematically analyzes four major challenges faced by deep coring-extreme working conditions， equipment adaptability for continuous coring in long well sections， coring efficiency， and well deviation control-based on typical drilling engineering practices both domestically and internationally. It reviews the application status of technologies concerning coring equipment， drill bits， downhole motors， wireline coring， anti-jamming， and deviation control， and comparatively analyzes the advantages， disadvantages， and engineering application effects of different processes. The research indicates that China has made significant progress in the field of deep coring； however， core technologies for efficient and high-quality continuous coring over long well sections under ultra-deep extreme environments still have shortcomings. The study points out that future coring technology will take the efficient and high-quality recovery of deep cores as its fundamental objective， and develop towards the deep integration of automation and intelligence. By constructing an integrated "measurement+control+coring" system， developing high-temperature-resistant downhole motor technologies， and making breakthroughs in ultra-deep wireline coring， core anti-jamming and plug-releasing technologies for long-run coring， as well as intelligent diagnosis and early warning technologies， a new generation of deep coring technology system will be established， providing technical support for China''s deep earth exploration.