METHOD FOR DETERMINING WATER CONTENT IN CRUDE OIL ASSAY Russian patent published in 2021 - IPC G01N33/26 G01N25/20 G01N25/58 

FIELD: measuring.

SUBSTANCE: invention relates to a method for determining the water content in a crude oil assay including weighing the crude oil assay. The assay is placed in a heat-insulated vessel, a predetermined amount of heat is supplied thereto or removed therefrom resulting in the temperature of the assay changing, the initial and final temperatures of the assay are measured at the onset of equilibrium thermal conditions, and by the determined amount of heat, the values of the initial and final temperatures of the assay, weight of the assay, the determined heat capacity of the heat-insulated vessel, known specific heat capacities of water and oil, the mass fraction of water is determined by the formula (1) and then, if necessary, by the given densities of water and oil, based on the obtained mass fraction of water, the volume fraction of water is determined:

where Q is the supplied or removed amount of heat, m is the mass of the assay, c_o is the specific heat capacity of oil, c_w is the specific heat capacity of water, C_v is the heat capacity of the heat-insulated vessel, t₁ and t₂ are the initial and final temperatures of the assay respectively after the onset of equilibrium thermal conditions, μ_w is the mass fraction of water in the crude oil assay.

EFFECT: reduced or eliminated effect of additional methodological errors on the accuracy of analysis of an assay, decreased labour intensity and analysis cost, increased degree of analysis automation.

1 cl