Patent ID: 6050353
Filing Date: 2000-04-18
Classification: E21B,F16L

Abstract:
A subassembly electrical isolation connector for interconnecting adjacent tubular drill rods of a drilling system used in drilling bore holes in earth formations, said connector electrically isolating such interconnected drill rods, said connector comprising:i) a housing;ii) a mandrel;iii) means for connecting said housing to a first tubular drill rod;iv) means for connecting said mandrel to a second tubular drill rod;v) means for interconnecting said housing and said mandrel in a manner to electrically isolate said housing from said mandrel with said housing overlapping at least a portion of said mandrel;vi) said housing having an isolated end which is electrically isolated from said mandrel and said means for connecting said mandrel to a second tubular drill rod;vii) said mandrel having a conical tapered body portion which is located within said housing and said housing having a corresponding conically tapered inner surface;viii) said conical taper for said housing and said mandrel converging inwardly away from said housing isolated end.