The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform
Atila Ertas - One of the best experts on this subject based on the ideXlab platform.
-
Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part 2 of a study of upper ball joint force variations due to riser tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation
-
Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part one of a study of upper ball joint force variations due to riser tensioner and vessel motions. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent
-
upper ball joint force variations due to riser tensioner and vessel motions part i derivation of general equations
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part one of a study of upper ball joint force variations due to riser tensioner and vessel motions. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent
-
upper ball joint force variations due to riser tensioner and vessel motions part ii analysis and computer simulation
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part 2 of a study of upper ball joint force variations due to riser tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation
T. J. Kozik - One of the best experts on this subject based on the ideXlab platform.
-
Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part 2 of a study of upper ball joint force variations due to riser tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation
-
Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part one of a study of upper ball joint force variations due to riser tensioner and vessel motions. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent
-
upper ball joint force variations due to riser tensioner and vessel motions part i derivation of general equations
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part one of a study of upper ball joint force variations due to riser tensioner and vessel motions. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent
-
upper ball joint force variations due to riser tensioner and vessel motions part ii analysis and computer simulation
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part 2 of a study of upper ball joint force variations due to riser tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation
J. E. Lowell - One of the best experts on this subject based on the ideXlab platform.
-
Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part II: Analysis and Computer Simulation
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part 2 of a study of upper ball joint force variations due to riser tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation
-
Upper Ball Joint Force Variations due to Riser Tensioner and Vessel Motions—Part I: Derivation of General Equations
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part one of a study of upper ball joint force variations due to riser tensioner and vessel motions. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent
-
upper ball joint force variations due to riser tensioner and vessel motions part i derivation of general equations
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part one of a study of upper ball joint force variations due to riser tensioner and vessel motions. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system are derived. An analysis of the variation of forces acting on the upper ball joint of a riser string due to Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent
-
upper ball joint force variations due to riser tensioner and vessel motions part ii analysis and computer simulation
Journal of Energy Resources Technology-transactions of The Asme, 1990Co-Authors: T. J. Kozik, J. E. Lowell, Atila ErtasAbstract:Part 2 of a study of upper ball joint force variations due to riser tensioner and vessel motions. An analysis of the variation of forces acting on the upper ball joint of a riser string due to the Drill Ship motion and riser tensioner dynamic has been conducted. The analysis includes the effect of breakaway torque on the tensioner sheaves while assuming vessel and upper ball joint motion to be independent. General equation for the tensioner cable forces and for the forces exerted on the riser upper ball joint by the Ship joint-tensioner system derived in Part I are solved. The variation in the tensioner cable forces is compared to data generated in field operation
James W Farrell - One of the best experts on this subject based on the ideXlab platform.
-
Deepwater Drilling in the Arctic Ocean’s permanent sea ice
Proc. IODP| Volume, 2006Co-Authors: Kevin Moran, JUHA BACKMAN, James W FarrellAbstract:A fundamentally new multiple-vessel approach was developedunder the auspices of the Ocean Drilling Program and the IntegratedOcean Drilling Program (IODP) to Drill and recover deeplyburied sediments in the Arctic Ocean. This approach overcamethe difficulty of maintaining position over a Drill site and recoveringsediments in waters that are covered in moving ice floes. InAugust 2004, a convoy of three icebreakers met at the ice edge,northwest of Franz Josef Land, and headed north to begin the ArcticCoring Expedition, IODP Expedition 302. This expedition successfullyrecovered core at depths >400 meters below seafloor in 9/10 ice-covered water depths ranging from 1100 to 1300 m. Expedition302 involved >200 people, including scientists, technicalstaff, icebreaker experts, ice management experts, Ships’ crew, andeducators. At the Drill site, temperatures hovered near 0°C and occasionallydropped to –12°C. Ice floes 1–3 m thick blanketed 90%(i.e., >9/10 ice cover) of the ocean surface, and ice ridges, severalmeters high, were encountered where floes converged. The icedrifted at speeds of up to 0.3 kt and changed direction over shorttime periods, sometimes within 1 h. A Swedish diesel-electric icebreaker,the Vidar Viking was converted to a Drill Ship for this expeditionby adding a moonpool and a geotechnical Drilling systemcapable of suspending >2000 m of Drill pipe through thewater column and into the underlying sediments. Two other icebreakers,a Russian nuclear vessel, the Sovetskiy Soyuz, and a Swedishdiesel-electric vessel, the Oden protected the Vidar Viking bycircling “upstream” in the flowing sea ice, breaking the floes intosmaller pieces that wouldn’t dislodge the Drilling vessel >75 mfrom a fixed position. Despite thick and pervasive ice cover, thefleet and ice management teams successfully enabled the Drillingteam to recover cores from three sites. Ice conditions became unmanageableonly twice, forcing the fleet to retrieve the pipe andmove away until conditions improved. The scientific results fromthis Drilling will significantly advance our understanding of Arcticand global climate.
-
deepwater Drilling in the arctic ocean s permanent sea ice
Proceedings of the Integrated Ocean Drilling Program, 2004Co-Authors: Kathryn Moran, Jan Backman, James W FarrellAbstract:A fundamentally new multiple-vessel approach was developed under the auspices of the Ocean Drilling Program and the Integrated Ocean Drilling Program (IODP) to Drill and recover deeply buried sediments in the Arctic Ocean. This approach overcame the difficulty of maintaining position over a Drill site and recovering sediments in waters that are covered in moving ice floes. In August 2004, a convoy of three icebreakers met at the ice edge, northwest of Franz Josef Land, and headed north to begin the Arctic Coring Expedition, IODP Expedition 302. This expedition successfully recovered core at depths >400 meters below seafloor in 9/ 10 ice-covered water depths ranging from 1100 to 1300 m. Expedition 302 involved >200 people, including scientists, technical staff, icebreaker experts, ice management experts, Ships’ crew, and educators. At the Drill site, temperatures hovered near 0°C and occasionally dropped to –12°C. Ice floes 1–3 m thick blanketed 90% (i.e., >9/10 ice cover) of the ocean surface, and ice ridges, several meters high, were encountered where floes converged. The ice drifted at speeds of up to 0.3 kt and changed direction over short time periods, sometimes within 1 h. A Swedish diesel-electric icebreaker, the Vidar Viking was converted to a Drill Ship for this expedition by adding a moonpool and a geotechnical Drilling system capable of suspending >2000 m of Drill pipe through the water column and into the underlying sediments. Two other icebreakers, a Russian nuclear vessel, the Sovetskiy Soyuz, and a Swedish diesel-electric vessel, the Oden protected the Vidar Viking by circling “upstream” in the flowing sea ice, breaking the floes into smaller pieces that wouldn’t dislodge the Drilling vessel >75 m from a fixed position. Despite thick and pervasive ice cover, the fleet and ice management teams successfully enabled the Drilling team to recover cores from three sites. Ice conditions became unmanageable only twice, forcing the fleet to retrieve the pipe and move away until conditions improved. The scientific results from this Drilling will significantly advance our understanding of Arctic and global climate.
Yuichi Shinmoto - One of the best experts on this subject based on the ideXlab platform.
-
Numerical analysis and experimental study of fluid return pressure for mud-pulse telemetry
2011 IEEE 3rd International Conference on Communication Software and Networks, 2011Co-Authors: Yuichi Shinmoto, Tsuyoshi Miyazaki, Junya Ishiwata, Eigo MiyazakiAbstract:The deep-sea Drilling vessel "CHIKYU" is a riser-equipped, dynamically positioned scientific Drill Ship owned and operated by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), and built for the purpose of scientific research and exploratory expeditions. Advanced measurement-while-Drilling (MWD) technology transmits realtime data from the downhole to the upper surface of the vessel using a pressure wave, i.e., a mud pulse, generated with a pressure modulator through the Drill string. In this study, a numerical one-dimensional fluid model has been designed and analysis carried out under the assumption of a pressure modulator located within the Drill pipe to monitor mud pulse simulations. Also, testing equipment for return pressure wave propagation has also been developed and performance tests carried out to generate return pressure waves from a pressure modulator in order to monitor mud pulse data transmission as compared to simulation results.
-
effect of Drill Ship motions on core sample conditions during the nankai trough seismogenic zone experiment
ASME 2009 28th International Conference on Ocean Offshore and Arctic Engineering, 2009Co-Authors: Yuichi Shinmoto, Kazuyasu WadaAbstract:The Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) Stage 1A, which is a part of the Integrated Ocean Drilling Program (IODP), is a series of expeditions in scientific Drilling and coring operations aboard the first riser-equipped deep sea Drilling vessel, Chikyu. The objectives are to recover good quality core samples and collect data on undersea properties and Drilling conditions, which will also provide valuable information for future expeditions. The coring operations were carried out under harsh Drilling and ocean conditions so that core recovery was inconsistent and fluctuated from high to low. Moreover, differences in independent lithology, depth, and the type of coring tools from previous expeditions made it necessary to analyze and optimize Drilling parameters with new data. A serious concern in retrieving core samples was the vertical heave motions caused by the Drill-Ship since the active heave compensator system could not be activated before operations due to the extreme deep sea conditions and only the passive heave compensator was used. The Drill string and coring tools are particularly vulnerable to the high heaving movements of the vessel so that the core recovery rate and quality are also adversely affected. The present work presents an analysis of geotechnical information, Drilling parameters and the Drill-Ship motions the NanTroSEIZE expedition in order to optimize core conditions and maintain high core recovery.Copyright © 2009 by ASME
