Patent ID: 6539795
Filing Date: 2003-04-01
Classification: B63B,E21B

Abstract:
A method for determining the depth (DL) of a fluid contact level between a first fluid (F1) having a fluid density (&rgr;F1) and a second fluid having another fluid density (&rgr;F2), which fluids are present in the pores of an hydrocarbon fluid bearing formation surrounding or underlying an underground borehole, the method comprising:(a) lowering a pressure probe assembly to a depth (DP) into the borehole and pressing a pair of pressure probes against the borehole wall, one of said pressure probes being adapted to measure solely the phase pressure (PF1) of the first fluid (F1) in the pores of the formation surrounding the borehole, the other pressure probe being adapted to measure solely the phase pressure (PF2) of the second fluid (F2) in the pores of the formation surrounding the borehole; and (b) determining the depth of said fluid contact level (DL) on the basis of the equation: DP-DL=PF1-PF2g&af;(Ï F1-Ï F2)â€ƒwhere g is the gravitational acceleration.