Method of determining the porosity of an underground...

Details Method of determining the porosity of an underground... Method of determining the porosity of an underground...

E - Fixed Constructions

21

B

255/1

E21B 49/00 (2006.01) E21B 44/00 (2006.01)

Patent

CA 1316525

ABSTRACT The invention relates to a method of determining the porosity of an underground 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: TOR = (k1 + k2.phi) WOBa where k1, k2 and a are parameters characteristic of the geometry of the drill bit.

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