METHOD FOR DETERMINING CORE WATER SATURATION Russian patent published in 2013 - IPC G01N27/22 

FIELD: oil and gas industry.

SUBSTANCE: method for determining water saturation of the core involves preparation of a reference sample from the core, extraction and drying of the reference sample, simulation of formation conditions in the reference core sample, filtration of mineralised water through the reference core sample and in-series measurement during filtration of intermediate values of current passing through the reference sample when alternating voltage is supplied to it, building of calibration relationship between amplitude of an electric signal and water saturation of the reference core sample, as per which there determined is water saturation of the investigated core sample, which differs by the fact that in addition, prior to measurements, the core is insulated with a thin dielectric cover and placed between electrodes of a capacitance-based measuring cell, and values of the current passing through the sample at different values of water saturation (0 to 100%) are determined using a contactless high-frequency conductometry, for example a non-linear unbalanced bridge method fed by high-frequency voltage with frequency of 2-10 MHz.

EFFECT: improving measurement accuracy and simplifying the process for determining water saturation of the core with simultaneous enlargement of the application field of the proposed method.

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