wwwoceandrillingorg HC Top drive A Water table Traveling blockTop drive dolly Pivot Drill pipe Drill bit at seafloor Drill string motion is oor is 3 ft On the other hand ciency is 85 The res ID: 358014
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ScientiÞ c Applicationrecovery or rate of penetration cleaning problems. Vertical ship coring tools. Without heave com-ing on weather.Tool Operations overcome the friction of seals each response time to overcome the seal friction is slow, resulting in a PHC ciency www.oceandrilling.org HC Top drive A Water table Traveling blockTop drive dolly Pivot Drill pipe Drill bit at seafloor Drill string motion is oor is ~3 ft. On the other hand, ciency is ~85%. The resulting device to overcome the PHC seal unit, the hydraulic forces of the ciency of the oor for any heave. 1) Passive and Active Heave t:improving core recovery and quality. The AHC also improves reentry cones and casing and as Circulation Obviation RetroÞ t water. PHC rod AHC rodLoad pinconnectingto hookRod end beam umbilical Traveling2) AHC Bit Lift-Off Reduction c heave t:recovery. Another signiÞ cant t of utilizing the AHC is uctua- uctua-)hard rock polycrystalline dia-high recovery on land, should also provide superior recovery ed hard/soft sediments The AHC is also necessary for the Hard Rock Reentry System 3) AHC Drilling Controlthat affect coring performance and drilling ROP. t:improve the drilling ROP. Coring tools are less tolerant than rotary when the AHC was used. Typical ship ned as drill string oor. Typical 4) AHC Tool ImprovementsExisting coring tools perform t: With improved WOB con-deployed to improve recovery in ery and data from downhole 0 40 60 100 140 160 180 240 260 280 300 -4 -2 2 4 6 0 40 60 100 140 160 180 240 260 280 300 6 8 12 14 16 Time (s)Time (s) SpeciÞ cationsMaximum AHC Dynamic Forcece)AHC Operating RangeMaximum Ship Vertical Velocity