METHOD TO DETERMINE RESIDUAL WATER SATURATION AND OTHER FORMS OF COMBINED WATER IN CORE MATERIAL Russian patent published in 2013 - IPC G01N27/02 G01N27/12 

FIELD: measurement equipment.

SUBSTANCE: in the method to determine water saturation of core and other forms of combined water in the core material includes preparation of a sample from core, extraction and drying of the sample, modelling of bed conditions in the core sample, filtration of mineralised water via the core sample and serial measurement of intermediate values of current passing through the sample as AC voltage is applied to it in process of filtration, building of dependence of the electric signal value on the water saturation of the core sample. Additionally, in accordance with the invention, prior to measurements the core is insulated with a thin dielectric shell and placed between electrodes of the capacitance measurement cell, and current values passing via the sample at different values of water saturation (from 0 to 100%), is determined by the method of contactless high-frequency conductivity measurement, for instance, by the method of non-linear unbalanced bridge, supplied with the high-frequency voltage with frequency of 2-10 MHz, using the produced dependence of values of the electric signal on water saturation of the core sample, three areas are identified with different values of rate of rise with growth of water saturation, and borders of energetically different categories of combined water in the core, including the residual water saturation, are determined as points of bending between specified areas with different values of signal slope.

EFFECT: higher accuracy of measurements and simplified process of determination of residual water saturation of core with simultaneous expansion of area of application of the developed method, in particular, other forms of combined water in core material.

2 cl, 5 dwg