METHOD OF DETERMINING WATER CONTENT IN OIL-WATER-HAS MIXTURE Russian patent published in 2009 - IPC G01N27/00 

FIELD: physics, measurements.

SUBSTANCE: invention is intended for oil production industry. The proposed method comprises the steps that follow. The oil-water-gas mixture density (ρ_l) is measured, the mixture inductivity (ε_l) is defined, pure oil (ρ_o) and water (ρ_w) densities are preset. Note here that water volume ratio in degassed oil (W_c) is calculated by solving the set of equations incorporating ρ_l and ε_l as constants and W_c as one of the variables. Note also that oil grade is preliminary defined and the measuring plant is calibrated, i.e. required factor (k) is assigned to the given oil grade to specify the content of gas dissolved in oil. Mind that aforesaid equations are based on dependencies relating the following components, i.e. ρ_l - the oil-water-gas mix, ρ_o - the pure oil density, ρ_w - water density, p_gd - dissolved gas density, W_c - water volume ratio in degassed oil, α - free gas volume ratio in oil-water-gas mix, k - factor specifying the content of gas dissolved in oil , ε_l - oil-water-gas mix inductivity, ε_"ув" - inductivity of waterless oil, free gas and dissolved gas.

EFFECT: higher accuracy of determining phase composition of oil-water-gas mix resulted from application of computation algorithm allowing for effect of free and dissolved in oil gas on measured properties, and higher accuracy of defining pure oil volume flow brought about by calculating water-to-oil ratio in fluid component of oil-water-gas mix without distortions caused by dissolved gas presence in oil.

16 cl, 2 dwg, 1 tbl