Methods for determining in situ shale strengths, elastic propert

Details Methods for determining in situ shale strengths, elastic propert Methods for determining in situ shale strengths, elastic propert

1990-08-31

1993-04-27

Williams, Hezron E.

Measuring and testing

Borehole or drilling

Downhole test

364422, G01N 3324

Patent

active

052051641

ABSTRACT:
A method for determining drilling fluid density for stabilizing a wellbore including obtaining shale cuttings from a wellbore. In one embodiment of a method according to this invention, shale cuttings are obtained from a wellbore and their index properties, including but not limited to surface area, is measured; mean effective stress around the wellbore is calculated using the geostatic overburden in situ stress, the field pore pressure, and the total stress around the wellbore; the in situ shale strength is determined using a correlation between surface area, mean effective stress and shale strength; and drilling fluid density is determined using the shale strength. Methods for determining in situ shale strengths, elastic properties, pore pressures, and formation stresses of low permeability rocks.

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