Patent ID: 8915315

Claim:
A drillpipe for a drill stem to drill a hole, the drill stem including a drill string and a bottom hole assembly, the drillpipe comprising: a first end comprising a female threading and having a first inertia; a second end comprising a male threading and having a second inertia; a first intermediate zone adjacent to the first end and having a third inertia; a second intermediate zone adjacent to the second end and having a fourth inertia; a central substantially tubular zone with an external diameter which is smaller than the maximum external diameter of at least the first or the second end and having a fifth inertia, the third and fourth inertias each being smaller than the first and second inertias and the fifth inertia being smaller than the third and fourth inertias; a casing fixed on the pipe over a portion of the external surface of the pipe; at least one physical parameter sensor disposed in the casing; and at least one data transmission or storage device connected to the sensor output; the casing being disposed at a distance from the first and second ends, and the casing being integral with the central zone at a distance from the first and second intermediate zones and having a smaller inertia than the first and second inertias.