THE MANDREL, A 60-FOOT-LONG PIPE AND MOUNTING BRACKET, CARRIES THE STABILIZERS, WEIGHTS AND DRILL BIT.
THE WASTE ISOLATION PILOT PLANT IS A DOE RESEARCH AND DEVELOPMENT FACILITY FOR DEMONSTRATING THE SAFE DISPOSAL OF TRANSURANIC RADIOACTIVE WASTES. TEST SHAFTS HAVE BEEN DRILLED TO A DEPTH OF 2,100 FEET. THE SHAFTS, ONE 6 FEET IN DIAMETER AND THE OTHER 12 FEET IN DIAMETER, PROVIDE AN ENTRY PASSAGE AND VENTILATION TO THE UNDERGROUND SALT ROCK FORMATION THAT IS BEING TESTED TO DETERMINE ITS SUITABILITY FOR RADIOACTIVE WASTE STORAGE. THE MANDREL WEIGHTS, CALLED SPLIT DONUTS, RANGE FROM ABOUT 8,000 LBS. TO 27,000 LBS. EACH. THESE WEIGHTS ARE REQUIRED TO PROVIDE WEIGHT ON THE DRILLING STEM FOR DRILLING DEEP HOLES. TO FACILITATE PROPER ALIGNMENT, A STABILIZER WITH ROLLERS IS USED, THIS PREVENTS THE BIT FROM DEFLECTING OFF THE SIDES OF THE HOLE.
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June 12, 2014
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