Method of determining the porosity of an underground formation b

Details Method of determining the porosity of an underground formation b Method of determining the porosity of an underground formation b

1989-06-28

1991-01-01

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

175 50, E21B 4900

Patent

active

049810367

ABSTRACT:
The invention relates to a method of determining the porosity of an undergound formation being drilled by a rotating drill bit mounted at the lower end of a drill string. The torque (TOR) and the weight (WOB) applied on the bit when drilling the underground formation are measured; the effect of the geometry of the drill bit on the torque and weight on bit response is determined; the porosity (phi) of the formation being drilled is derived from the measured TOR and WOB taking into account the effect of the geometry of the drill bit. Preferentially, the porosity phi is determined from the following equation:

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patent: 4876886 (1989-10-01), Bible et al.
"Separating Bit and Lithological Effects from Drilling Mechanics Data", I. G. Falconer et al., IADC/SPE 17191, Dallas, Tex., 1988.
"The Drilling Porosity Log", W. A. Zoeller, SPE 3066, 45th SPE Annual Fall Mtg., 1972.

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