Method for determining formation pressure

Details Method for determining formation pressure Method for determining formation pressure

1991-04-15

1993-02-09

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

73153, 166264, E21B 4908

Patent

active

051845083

ABSTRACT:
A method for accurately determining the formation pressure of earth formans. Formation measurements are made with by use of a novel downhole tool which allows drilling mud to enter the tool in such a way that decompression of drilling mud is controlled so that the pressure in the borehole is allowed to fall only slightly below the formation pressure. The drawdown of mud into the tool is then stopped and the pressure is allowed to stabilize at the formation pressure. The measurement is completed in a matter of a few minutes as opposed to hours, or even days, as required by more conventional techniques.

REFERENCES:
patent: 4597439 (1986-07-01), Meek
patent: 4903765 (1990-02-01), Zunkel

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