METHOD AND DEVICE FOR DETERMINING FLOW RATES (FLOW RATE) AND CONCENTRATION OF WATER IN WATER-OIL MIXTURES Russian patent published in 2024 - IPC G01N24/08 

FIELD: measuring equipment; oil and gas industry.

SUBSTANCE: invention relates to methods and devices for determining process parameters of water-oil mixtures by non-destructive rapid control by proton magnetic resonance relaxometry (PMRR), and is intended for determination on flow in technical emulsions—borehole fluid (BFL), crude oil (CO), oil bitumen, oil sludge, waste oils, etc.—flow rates (flow rate) and water concentrations, and can be used in production and preparation of oil for transportation to oil refineries, on terminals, ships and drilling platforms, at thermal power plants and boiler houses, in which boiler fuel and fuel emulsions are used. Method for determining flow rate, flow rate and concentration of water in water-oil mixtures on a stream involves sampling from a main pipe into a flow magnetic resonance analyzer NMR sensor, consisting in the fact that in a sample placed in a constant magnetic field, spin-echo (SE) signals of proton magnetic resonance are excited by series of radio-frequency pulses of Carr–Purcell–Meiboom–Gill (CPMG), recording the amplitudes of the SE in the reference and measured samples, wherein the components of the analyzed mixture—water and oil, are taken as reference, effective times of spin-spin relaxation in reference and measured samples are measured by initial sections of envelopes of SE in a certain interval, after which concentration of water in oil is determined. Water-oil mixtures are intensively homogenised, further, a portion of the mixture taken from the flow is pre-magnetized in a field of high magnetic induction in the magnetising magnet, moved into a constant magnetic field of the measuring magnet, wherein the bias magnet has a greater length and magnetic induction than the measuring magnet and the obtained PMR parameters are used to determine the flow rate, flow rate and concentration of components of the oil-water mixture. Device for determining flow rate, flow rate and concentration of water components in water-oil mixtures on a stream includes a flow-through magnetic resonance analyzer, in which the bias magnet has a greater length and magnetic induction than the measuring magnet and both magnets are assembled in the form of a Halbach magnetic assembly, wherein the device is configured to eject the measured portion of the mixture from the coil of the NMR sensor with the next portion supplied to the coil of the NMR sensor, and drain into a separate container.

EFFECT: increased sensitivity of the method and device, reduced weight, increased reliability of flow rate and humidity measurement.

4 cl, 5 dwg