34 results about "Phase holdup" patented technology

The invention provides a two-phase flow parameter measurement method based on a dual-head capacitance probe and a device thereof, belonging to the field of multi-phase flow testing technology. The device comprises the dual-head capacitance probe, a probe driving mechanism, two capacitance measurement circuits, a fixed capacitor, a slab electrode and a computer system; wherein, the dual-head capacitance probe system consists of two independent single-point capacitance probes and can carry out one-dimensional motion on the section of a pipeline. The method comprises the steps as follows: each single-point capacitance probe is used for recognizing fluid property; when the fluid passing through the head of the probe is conducted, the circuit is connected and the capacitance measurement deviceoutputs high level, otherwise the circuit is cut off and the capacitance measurement device outputs low level. The level signal can obtain local phase holdup; the measurement result of the method is not affected by the conductivity of the fluid and the spacing of the probes. The local phase holdup and the flowing speed can be obtained by processing the two single-point capacitance probe signals by the threshold method and the correlation method; the flowing pattern information can be obtained by combining with two-phase flow knowledge, thus achieving the recognition of flow pattern on line.

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 relates to an oil gas water three-phase plugged dispersed flow velocity measuring method. The oil gas water three-phase plugged dispersed flow velocity measuring method comprises steps that 1) a phase holdup measuring device is used to acquire various phase holdup information; 2) a continuous phase and dispersed phases of a three-phase plugged dispersed flow are determined according to the phase holdup; 3) receiving signals acquired by an ultrasonic transducer are demodulated, and Doppler frequency shift is acquired; 4) drag force between the continuous phase and a dispersed gas phase is calculated; 5) the drag force between the continuous phase and a dispersed liquid phase is calculated; 6) shearing force of a tube wall applied to the continuous liquid phase is calculated; 7) ternary non-linear equations related to uc, ug, ud are established; 8) by adopting a numerical iteration type algorithm for solution, the optimal estimations of the uc, the ug, and the ud are acquired; 9) a three-phase flow split phase apparent velocity is calculated.

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.

The invention provides a system and method for measuring split-phase volume fraction of oil-gas-water multi-phase fluid in oil production well logging. According to the system for measuring the split-phase volume fraction of the oil-gas-water multi-phase fluid in oil production well logging, a light signal reflected by oil well underground petroleum is converted to an electric signal through a multi-receiving-end optical fiber probe sensor, and the electric signal is transmitted to a data processing analysis system through a data collection system. According to the data processing analysis system, through a clustering network model from comprehensive feature parameters to the oil-gas-water multi-phase fluid, according to the comprehensive feature parameters obtained by feature extraction and normalization processing carried out on a voltage signal detected by the multi-receiving-end optical fiber probe sensor, split-phase volume fraction information of the oil well underground oil-gas-water multi-phase fluid is obtained, measurement error of split-phase volume fraction of the oil well underground oil-gas-water multi-phase fluid is reduced, and the technical defect that an optical fiber method cannot realize oil-water detection is overcome.

The invention relates to method for measuring the water retention rate of extra high water-containing oil based on heat trace. The method for measuring the water retention rate of extra high water-containing oil based on heat trace comprises the steps that heat quantity dissipated during heating of a heat generator in unit time is calculated according to internal resistance and a heating voltage value of the known heat generator; the initial temperature and the temperature after heating in a fluid is measured; the theoretical values of the oil phase heat absorption and the water phase heat absorption in a thermal pulse to-be-tested fluid per unit time are calculated; actual heat quantities absorbed by oil and water are calculated; the sum of volume low rates of each phase fluid per unit time is calculated; measurement models between a heat source heating voltage and the initial temperature, the temperature after heating, a water phase mass flow quantity, and an oil phase mass flow quantity are established; establish a mathematical model of the water phase mass flow quantity and the oil phase mass flow quantity is established; a mathematical model of a water phase holdup rate and anoil phase holdup rate is established. According to the method for measuring the water retention rate of extra high water-containing oil based on heat trace, measurement accuracy is only affected by the sensitivity of a temperature sensor, the influence on the measurement accuracy due to unknown fluid distribution during an extra high water retaining development period is effectively solved, and the measurement accuracy of oil and water holdup rates is improved.

A gas-liquid phase holdup measurement and verification method based on modal migration complex network: constructing modal migration complex network; calculating gas-liquid two-phase flow parameter measurement information; drawing directional weighted aggregation coefficient, local betweenness and average shortest The measurement chart of the linear relationship between path and phase holdup realizes the measurement of phase holdup of gas-liquid two-phase flow; according to the drawn measurement chart, analyze the directional weighted aggregation coefficient, local betweenness and average shortest path and flow pattern evolution dynamics relationship, revealing the dynamic mechanism of gas-liquid two-phase flow flow regime evolution. The verification method is to use four-sector distributed conductance sensors for verification. The present invention proposes a multivariate time series modal migration complex network method for information fusion of two-phase flow distributed conductance sensor measurement signals; the multivariate time series modal migration complex network information fusion method can effectively identify different gas-liquid two-phase flows type; the verification of multivariate time series modal migration complex network information fusion method can obtain good phase inclusion rate measurement results.

The invention provides a two-phase flow separation phase holdup conductivity sensor. The sensor is composed of a conductive ring layer and an excitation electrode pair and a measurement electrode pair attached to it. The excitation electrode and the measurement electrode are on the upper diameter of the pipe wall of the conductive ring layer. Symmetrically distributed in a spiral at an angle of 180 degrees. At the same time, a structural parameter optimization method based on the above-mentioned sensor structure is also provided. The beneficial effects of the present invention are aimed at the real-time measurement of the phase holdup of two-phase flow, which overcomes the shortcoming that the measurement electrode is in contact with the non-conductive substance in the traditional conductivity sensor, which causes the measurement electrode to float, and provides a conductivity type electrical sensor based on its analysis The model gives the expression of the sensitivity distribution at any point on the two-dimensional sensor cross-section, which can quickly optimize the structural parameters. Belonging to non-invasive rapid measurement, the measurement range is widened, and the cost is low.