CORE ORIENTATION

A REVIEW IS PRESENTED OF THE FOLLOWING CORING EQUIPMENT: CONVENTIONAL CORE BARRELS, RUBBER SLEEVE CORE BARREL, AND PRESSURE CORE BARREL. THE SPATIAL ORIENTATION OF CORES HAS REMAINED A LIMITED LABORATORY ACTIVITY BECAUSE OF LACK OF PROPER EQUIPMENT. THIS SITUATION HAS NOW BEEN CORRECTED WITH THE INTRODUCTION OF THE CHRISTENSEN-HUGEL CORE ORIENTATION SYSTEM. THIS SYSTEM IS ADAPTABLE TO ANY SWIVEL TYPE CORE BARREL OR LARGER. THE SYSTEM IS FIELDWORTHY, HAVING CUT AND ORIENTED THOUSANDS OF FEET OF CORE, USING NEAR-CONVENTIONAL CORE BARRELS. THREE GROOVES ARE CUT INTO THE CORE CONTINUOUSLY AS IT ENTERS THE BARREL. THE REFERENCE GROOVE HAS A FIXED, KNOWN RELATION TO THE ORIENTING LUG WHICH APPEARS ON THE SURVEY INSTRUMENT'S PHOTOGRAPHS TO BE TAKEN EVERY 2 MINUTES, EVERY MINUTE, OR 3 PICTURES PER MINUTE, DEPENDING ON THE CLOCKS USED. THE ORIENTING SYSTEM USES MULTISHOT DIRECTIONAL SURVEY INSTRUMENTS, THE MODIFIED DOUBLE-TUBE CORE BARREL AND DIAMOND CORE BIT, AND THE HUGEL SCRIBING SHOE IMMEDIATELY ABOVE THE BIT. FIELD PERFORMANCE IN CORING THOUSANDS OF FEET SHOWS THAT RELIABLY ORIENTED CORES CAN BE OBTAINED ON A COMMERCIAL BASIS WITH THIS TECHNIQUE. THE CORE IN THIS SYSTEM IS CONTINOUSLY GROOVED BY THREE SPECIAL KNIVES, AND ORIENTATION IS OBTAINED BY CORRELATION BETWEEN THE GROOVES AND PICTURES FROM A MULTISHOT SURVEY INSTRUMENT ROTATIONALLY FIXED ON THE STATIONARY INNER BARREL ASSEMBLY. THESE DEVELOPMENTS GIVE PROMISE OF EXPANDING INTEREST IN CORE ORIENTATION.

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Filing Info

  • Accession Number: 00229600
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:39AM