Patent ID: 6158532
Filing Date: 2000-12-12
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 end which is electrically isolated from said mandrel and said means for connecting said mandrel to a second tubular drill rod;vii) said interconnecting means including a tubular fastener for threadable engagement with said mandrel and said tubular fastener having a shoulder for engagement with said housing to advance said housing over said mandrel;viii) means for blocking advance of said housing onto said mandrel to ensure definition of an electrical insulation space between said mandrel and said housing.