DEVICE AND METHOD FOR STUDYING POROUS SAMPLES, SYSTEM AND METHOD FOR CONSTRUCTING THE DISTRIBUTION OF THE SPECIFIC ELECTRIC RESISTANCE OF POROUS SAMPLES WITH THEIR USE Russian patent published in 2022 - IPC E21B49/00 G01N27/00 G01N33/24 

FIELD: oil and gas industry.

SUBSTANCE: inventions group can be used in the oil and gas industry and engineering geophysics. The method for studying porous samples is implemented as follows: a cuff with a porous sample placed in it is clamped by a pressure supply device from both sides, the injection and measuring electrodes in the cuff are connected to the porous sample and to a switch connected to an analogue-to-digital converter and a current source. The holder, bounded on both sides by fixed stops, one of which is connected to the pressure supply device, and the pressure supply device are filled with hydraulic fluid using a pressure supply line. Displaced and displacing liquids are fed in turn into the sample along the liquid supply lines. A current of known magnitude is supplied to two injecting electrodes using a current source and a switch, and the potential difference induced by the injecting electrodes on the two measuring electrodes is measured. Next, the target range is filtered from the noisy signal and the apparent resistivity of the porous sample is calculated. After obtaining an array of apparent resistivity data, the inverse problem is solved and a model of the electrical resistivity of the medium inside the sample is built.

EFFECT: fast and efficient electrotomography technique is provided for the study of porous samples, including in dynamics, namely, obtaining and building a three-dimensional model of the electrical resistivity of rock samples with the ability to determine the position of the front of the displacing fluid in the porous sample and with the calculation of the saturation of the displaced and displacing fluids.

22 cl, 6 dwg