6. Diamond Coring System Phase II (4500 Depth Capability)
Storms, M. A., Natland, J. H., et al., 1991 Proceedings of the Ocean Drilling Program, Initial Reports, Vol.132 6. THE DIAMOND CORING SYSTEM PHASE II (4500 M DEPTH CAPABILITY)1 Dan H. Reudelhuber2 and Steven P. Howard2 . Dedicated to the all of the many talented people Heave compensation and controls functioning, although off to (SEDCO/FOREX, Partech, DRECO, Tech Power Controls, Dr. a shaky start, eventually were operational, and the system Chuck McKinnon, and Duke Zinkgraf) who contributed to creat- provided effective secondary compensation. A problem with ing the diamond coring system. servo velocity signal quality was resolved by taking a completely different approach to acceleration measurement. Control elec- EXECUTIVE SUMMARY tronics were reliable, and the extra steps taken to protect the Leg 132 deployment and use of the Diamond Coring System electronics from the environment were successful. Weight On Bit (DCS) platform/mast assembly demonstrated the potential of the (WOB) control was good and allowed coring with measured WOB system for meeting scientific goals that cannot be realized with variations of ± 200-500 lb. Feed rate control mode was tested and conventional drilling techniques. That was due to the tremendous worked quite well. A load cell accuracy problem will have to be and diligent efforts of all parties concerned, both before and solved so that load measurement can be corrected. during Leg 132. Although some limited equipment problems were The new heavy-duty hydraulic wireline winch and 3/8 in. experienced, the problems were solved and the system was made sandline system made the retrieval of cores and downhole tools fully operational before the end of the first coring site.
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