METHOD FOR DETERMINING RESIDUAL WATER SATURATION IN OIL-BEARING ROCKS Russian patent published in 2013 - IPC E21B49/00 G01N15/00 

FIELD: oil and gas industry.

SUBSTANCE: presented method implements the principle of change of a specimen position relative to direction of centrifugal force at centrifugation of the specimen for the purpose of more complete removal of capillary retained water and more accurate determination of the fixed water volume. The change of the specimen position during centrifugation provides water drainage from dead-end pores and concave sections of pore channels. The change of specimen position relative to centrifugal force vector is achieved due to the fact that in addition to the specimen rotation in the centrifuge about the rotor, the specimen rotates about its own centre.

EFFECT: improving the accuracy of determination of the quantity of fixed water in rocks owing to more complete removal of capillary water from the specimen at centrifugation.

5 dwg