Methods for measuring physical parameters of a low permeability

Details Methods for measuring physical parameters of a low permeability Methods for measuring physical parameters of a low permeability

1992-08-18

1994-02-15

Woodiel, Donald O.

Measuring and testing

Instrument mechanism or transmission

Rate of change

73597, G01N 300

Patent

active

052856925

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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