Patent ID: 8833472
Filing Date: 2014-09-16
Classification: E21B,G01V

Abstract:
1. A system for signal transmission along a drill string comprising: a first drill pipe section; a first inner pipe corresponding to the first drill pipe section; a second drill pipe section; a second inner pipe corresponding to the second drill pipe section; a first repeater sub coupled to the first drill pipe section and the second drill pipe section at a first position along the drill string, the first repeater sub comprising an inner mandrel; a first contact, wherein the first contact provides a first current flow path between the first drill pipe section and the inner mandrel; a second contact, wherein the second contact provides a second current flow path between the first inner pipe and the inner mandrel; a third contact, wherein the third contact provides a third current flow path between the second drill pipe section and the inner mandrel; and a fourth contact, wherein the fourth contact provides a fourth current flow path between the second inner pipe and the inner mandrel;