| 摘要 |
FIELD: gas industry.SUBSTANCE: invention relates to gas industry and is intended for study of gas condensate mixtures in porous medium, namely, for determination of pressure at the beginning of condensation in porous medium. Method of determining condensation beginning pressure in porous medium involves supply of initial gas-condensate mixture into a porous medium, preparation of the porous medium, placing of the prepared porous medium into a X-ray-transparent core holder, creation of rock pressure in the porous medium, supply of methane under pressure equal to formation pressure, creating and maintaining of constant formation pressure in re-combiner and in porous medium, supply of initial gas-condensate mixture into the porous medium at a pressure equal to formation pressure by pumping of 2-3 pore volumes of the initial gas-condensate mixture, simulation of the process of porous medium exhaustion at a selected step of pressure reduction, heating of the x-ray tube and scanning of the porous medium at every step of pressure reduction, recording of x-ray intensity value at the selected pressure after each scanning of the porous medium, plotting of the diagram demonstrating the change (due to pressure) of the x-ray signal passing through the porous medium pressure in the following way: on the abscissa there are marked values of pressure P (MPa) during the process of porous medium exhaustion, on the axis of ordinates there are marked values of X-ray radiation I intensity (relative units). Process of porous medium exhaustion is performed prior to reception of the extremum on the diagram, by which there is determined the value of condensation beginning pressure P(MPa).EFFECT: technical result: higher accuracy and reduced labour intensiveness of measurement of condensate beginning pressure of gas condensate mixtures in porous medium.1 cl, 1 dwg, 1 tbl |
