Patent ID: 8587303
Filing Date: 2013-11-19
Classification: G01N,G01R,G01V

Abstract:
1. An apparatus configured to evaluate an earth formation having a fluid therein, the apparatus comprising: a carrier configured to be conveyed into a borehole in the earth formation wherein a pressure of a fluid in the formation exceeds a pressure of a fluid in the borehole; a magnet assembly on the carrier configured to produce a static magnetic field in the earth formation and define a region of examination; an antenna on the carrier configured to be activated with a pulse sequence and produce signals from nuclear spins in the region of examination; and a processor configured to estimate a value of a property of the earth formation using the produced signals; wherein a magnetic field gradient in the region of examination is selected to suppress an effect of a formation fluid flow on the produced signals, the fluid flow being caused by the pressure of the fluid in the formation exceeding the pressure of the fluid in the borehole.