Method and apparatus for determining formation pressure

Details Method and apparatus for determining formation pressure Method and apparatus for determining formation pressure

1997-08-13

1998-08-04

Biegel, Ronald L.

Measuring and testing

Borehole or drilling

Pressure measurement

E21B 4900

Patent

active

057896690

ABSTRACT:
A method is disclosed for determining true formation pressure in formations surrounding a fluid-containing borehole having a mudcake on the surface thereof, including the following steps: with the pressure in the borehole at a first measured borehole pressure, measuring, as a first probe pressure, the pressure in the formation adjacent the mudcake; with the pressure in the borehole at a second measured borehole pressure, measuring, as a second probe pressure, the pressure in the formation adjacent the mudcake; and deriving the true formation pressure from the first and second measured borehole pressures and the first and second probe pressures.

REFERENCES:
patent: 3115775 (1963-12-01), Russell
patent: 5065619 (1991-11-01), Myska
patent: 5184508 (1993-02-01), Desbrandes
patent: 5233866 (1993-08-01), Desbrandes

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