Pressure-preserved coring technologies are critical for deep-earth resource exploration but are constrained by the inability to achieve multidirectional coring,restricting exploration range while escalating costs and ...Pressure-preserved coring technologies are critical for deep-earth resource exploration but are constrained by the inability to achieve multidirectional coring,restricting exploration range while escalating costs and environmental impacts.We developed a multidirectional pressure-preserved coring system based on magnetic control for deep-earth environments up to 5000 m.The system integrates a magnetically controlled method and key pressure-preserved components to ensure precise self-triggering and self-sealing.It is supported by geometric control equations for optimizing structural stability.Their structure was verified and optimized through theoretical and numerical calculations to meet design objectives.To clarify the self-triggering mechanism in complex environments,a dynamic interference model was established,verifying stability during multidirectional coring.The prototype was fabricated,and functional tests confirmed that it met its design objectives.In a 300-meter-deep test inclined well,10 coring operations were completed with a 100%pressure-preserved success rate,confirming the accuracy of the dynamic interference model analysis.Field trials in a 1970-meter-deep inclined petroleum well,representative of complex environments,demonstrated an in-situ pressure preservation efficiency of 92.18%at 22 MPa.This system innovatively expands the application scope of pressure-preserved coring,providing technical support for efficient and sustainable deep resources exploration and mining.展开更多
In 2023,the China National Petroleum Corporation(CNPC)has successfully drilled a 10000-m ultra-deep well-TK-1 in the Tarim Basin,NW China.This pioneering project has achieved dual breakthroughs in ten-thousand-meter u...In 2023,the China National Petroleum Corporation(CNPC)has successfully drilled a 10000-m ultra-deep well-TK-1 in the Tarim Basin,NW China.This pioneering project has achieved dual breakthroughs in ten-thousand-meter ultra-deep earth science research and hydrocarbon exploration while driving technological advancements in ultra-deep well drilling engineering.The successful completion of TK-1 has yielded transformative geological discoveries.For the first time in exploration history,comprehensive data including cores,well logs,fluids,temperature and pressure were obtained from 10000-meter depths.These findings conclusively demonstrate the existence of effective source rocks,carbonate reservoirs,and producible conventional hydrocarbons at such extreme depths-fundamentally challenging established petroleum geology paradigms.The results not only confirm the enormous hydrocarbon potential of ultra-deep formations in the Tarim Basin but also identify the most promising exploration targets.From an engineering perspective,the project has established four groundbreaking technological systems:safe drilling in complex pressure systems of ultra-deep wells,optimized and fast drilling in complex and difficult-to-drill formations of ultra-deep wells,wellbore quality control under harsh conditions in ultra-deep wells,and data acquisition in ultra-deep,ultra-high-temperature complex formations.Additionally,ten key tools for ultra-deep well drilling and completion engineering were developed,enabling the successful completion of Asia’s first and the world’s second-deepest vertical well.This achievement has significantly advanced the understanding of geological conditions at depths exceeding 10000 m and positioned China as one of the few countries with core technologies for ultra-deep well drilling.展开更多
基金supported by the National Key Research and Development Program of China(No.2023YFF0615401)Joint Funds of the National Natural Science Foundation of China(No.U24A2087)+1 种基金Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences(No.SKLGME022009)the National Natural Science Foundation of China(No.42477191)。
文摘Pressure-preserved coring technologies are critical for deep-earth resource exploration but are constrained by the inability to achieve multidirectional coring,restricting exploration range while escalating costs and environmental impacts.We developed a multidirectional pressure-preserved coring system based on magnetic control for deep-earth environments up to 5000 m.The system integrates a magnetically controlled method and key pressure-preserved components to ensure precise self-triggering and self-sealing.It is supported by geometric control equations for optimizing structural stability.Their structure was verified and optimized through theoretical and numerical calculations to meet design objectives.To clarify the self-triggering mechanism in complex environments,a dynamic interference model was established,verifying stability during multidirectional coring.The prototype was fabricated,and functional tests confirmed that it met its design objectives.In a 300-meter-deep test inclined well,10 coring operations were completed with a 100%pressure-preserved success rate,confirming the accuracy of the dynamic interference model analysis.Field trials in a 1970-meter-deep inclined petroleum well,representative of complex environments,demonstrated an in-situ pressure preservation efficiency of 92.18%at 22 MPa.This system innovatively expands the application scope of pressure-preserved coring,providing technical support for efficient and sustainable deep resources exploration and mining.
文摘In 2023,the China National Petroleum Corporation(CNPC)has successfully drilled a 10000-m ultra-deep well-TK-1 in the Tarim Basin,NW China.This pioneering project has achieved dual breakthroughs in ten-thousand-meter ultra-deep earth science research and hydrocarbon exploration while driving technological advancements in ultra-deep well drilling engineering.The successful completion of TK-1 has yielded transformative geological discoveries.For the first time in exploration history,comprehensive data including cores,well logs,fluids,temperature and pressure were obtained from 10000-meter depths.These findings conclusively demonstrate the existence of effective source rocks,carbonate reservoirs,and producible conventional hydrocarbons at such extreme depths-fundamentally challenging established petroleum geology paradigms.The results not only confirm the enormous hydrocarbon potential of ultra-deep formations in the Tarim Basin but also identify the most promising exploration targets.From an engineering perspective,the project has established four groundbreaking technological systems:safe drilling in complex pressure systems of ultra-deep wells,optimized and fast drilling in complex and difficult-to-drill formations of ultra-deep wells,wellbore quality control under harsh conditions in ultra-deep wells,and data acquisition in ultra-deep,ultra-high-temperature complex formations.Additionally,ten key tools for ultra-deep well drilling and completion engineering were developed,enabling the successful completion of Asia’s first and the world’s second-deepest vertical well.This achievement has significantly advanced the understanding of geological conditions at depths exceeding 10000 m and positioned China as one of the few countries with core technologies for ultra-deep well drilling.
