METHOD FOR OPEN ROCK SAMPLE POROSITY DETERMINATION Russian patent published in 2006 - IPC G01N15/08 

FIELD: works for oil and gas reserves prospecting, particularly investigating permeability, pore volume, or surface area of porous materials.

SUBSTANCE: method involves performing thermostating of cleaned and dried rock sample in hydraulic system having predetermined dead zone volume V_rc, which may provide formation pressure; evacuating hydraulic system containing rock sample; applying pressure to the sample so that the sample is compressed from all sides; continuously saturating sample with fluid so that pressure in open sample pores increases to value equal to formation pressure along with maintaining constant effective pressure value; measuring summary fluid volume V_Σ, which is necessary for sample saturation up to formation pressure stabilization; determining open porosity of the sample as difference between V_Σ and V_rc volumes.

EFFECT: possibility to determine open sample porosity in-place conditions.

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