Patent ID: 6739409
Filing Date: 2004-05-25
Classification: E21B,G01V

Abstract:
An apparatus for nuclear magnetic resonance (NMR) measurement while drilling a borehole in a formation and determining a parameter of interest of the formation surrounding the borehole during drilling operations, said apparatus comprising:a longitudinal member for rotating a drill bit and adapted to be conveyed in the borehole the longitudinal member having a system generating an RF electromagnetic field associated with the formation for determining a parameter of interest of the formation; and an assembly rotationally coupled to said longitudinal member, said assembly further comprising at least one clamping device for engaging the borehole to stabilize the assembly to the borehole thereby rotationally fixing the assembly with respect to the borehole, wherein the motion of the assembly relative to the formation is minimized the assembly having a permanent magnet for inducing a static magnetic field in the formation for determining a parameter of interest of the formation.