Method and apparatus for instantaneously indicating permeability

Details Method and apparatus for instantaneously indicating permeability Method and apparatus for instantaneously indicating permeability

1988-09-22

1989-07-04

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

048438782

ABSTRACT:
For use in a formation testing tool adapted to be lowered into a borehole on a logging cable, apparatus is set forth which conducts formation measurements including extension of a snorkel into a formation of interest, initiating a drawdown beginning at a first time and terminating at a second time. The flow rate in the drawdown is measured. The present apparatus and method further determine a Horner Plot for that particular formation, and measure the slope of the Horner Plot and also extend the Horner Plot to thereby obtain the intercept representative of final formation pressure after build-up. A relationship is evaluated, and computer circuitry for determining permeability responds to the slope of the Horner Plot, formation fluid viscosity, pretest flow rate and formation thickness to yield permeability.

REFERENCES:
patent: 4597290 (1986-07-01), Bourdet et al.
patent: 4745802 (1988-05-01), Purfurst

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