34 results about "Phase holdup" patented technology

The invention belongs to the technical field of multiphase flow metering and particularly relates to a double-nozzle based online calculation method of oil well multiphase flow split-phase content. The method comprises steps as follows: (1) acquiring an instantaneous differential pressure value of two nozzles; (2) calculating a standard difference of differential pressure signal fluctuations; (3)performing dimensionless processing on the standard difference; (4) fitting a related expression of a dimensionless parameter Z1 with air content and a Reynolds number; (5) fitting a related expression of a dimensionless parameter Z2 with air content and a Froude number; (6) performing simultaneous processing on the related expressions to obtain a related expression of the air content and the dimensionless parameters; (7) obtaining water content W through a radio frequency water content measuring device; and (8) calculating total flow by use of a multiphase flow split-phase model. By means ofthe provided calculation method, flowing influences are considered by adding the Reynolds number and the Froude number, and the calculation accuracy is ensured.

The invention discloses a real-time capacitance measurement system for a phase volume fraction of gas-liquid two-phase flow and a measurement method thereof. The real-time capacitance measurement system comprises a double-concave-surface capacitance electrode device consisting of a double-concave-surface capacitance electrode group mounted on the outer wall of an insulating pipeline, an insulating filling material and a copper protection shell, a signal source and capacitance-voltage conversion integrated circuit, an acquisition board card and a computer, wherein the signal source and capacitance-voltage conversion integrated circuit comprises an MS3110 chip, an INPUT CAP, a USB (universal serial bus) interface, a single-chip microcomputer, a Vout air interface and a restarting key. The measurement method comprises the steps of setting a chip parameter; performing static gas-liquid two-phase flow calibration through the double-concave-surface capacitance electrode device, assembling a double-concave-surface capacitance electrode on the outer wall of a pipeline to be measured, and performing phase volume fraction measurement on the gas-liquid two-phase flow moving in the pipeline. According to the real-time capacitance measurement system, the radial length of the pipeline is large, and the real-time capacitance measurement system is sensitive to the micro change of the phase volume fraction on the inner section of the pipeline; a difference of output voltage values is enabled to be outstanding by changing a built-in parameter of the chip.