34 results about "Phase holdup" patented technology

The invention discloses a multiphase wet air flow and phase content online measurement method and device. The multiphase wet air flow and phase content online measurement device comprises a cylindrical V cone throttling device; a throttling cone body and a temperature sensor are arranged in an inner chamber of the V cone throttling device along the wet air flow direction in turn; the throttling cone body is connected with a retraction section differential pressure sensor and an expansion section differential pressure sensor through a pressure taking pipe; a pressure sensor, the retraction section differential pressure sensor, the expansion section differential pressure sensor and the temperature sensor are connected with a data processing system; a wet air flow inlet of the V cone throttling device is connected with a capacitance probe device through a flange. According to the multiphase wet air flow and phase content online measurement method and device, the wet gas passes through the V cone throttling device which is provided with the pressure sensor, the differential pressure sensors and the temperature sensor and statistical data are transmitted to the data processing system through the pressure sensor, the differential pressure sensors and the temperature sensor to be processed.

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 an unobstructed oil-gas-water multiphase flow parameter petroleum production combined well logging instrument. Including an integrated measurement sensor and a control system; the integrated measurement sensor includes a measurement pipeline, a capacitance measurement module, an electromagnetic correlation flow measurement module and an impedance measurement module; the electromagnetic correlation flow measurement module is arranged in the insulation area of ​​the measurement pipeline The impedance measurement module is arranged in the inner insulating layer of the capacitance measurement module, and the inner surface of the impedance measurement module is exposed in the measurement pipeline; the upper and lower ends of the capacitance measurement module are connected to the insulation area; the control The system provides circuits and measurement methods, and controls the corresponding modules to measure and calculate the water phase flow and oil phase flow according to the internal fluid state of the integrated sensor. The invention realizes the accurate real-time measurement of the oil-water two-phase flow parameters (flow rate and phase separation holdup) at the wellhead, and has the characteristics of compact structure, low cost, no moving parts, no obstructed flow, high reliability and the like.

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 provides a gas-liquid two-phase flow phase holdup and a separate phase flow rate detection device and detection method. The device comprises an outer tube, an inner tube, a differential pressure transmitter, an LCR tester, a data collection unit and a data processing unit. The inner tube is connected in the outer tube in a sleeved mode, the middle of the inner tube is a baffle area, the two ends of the inner tube are circulation areas, fluid outlet holes and fluid inlet holes are formed in the side walls of the circulation areas at the two ends of the inner tube respectively, a to-be-tested fluid enters the inner tube from one circulation area of the inner tube, enters an annular space between the inner tube and the outer tube through the fluid outlet holes and then flows to the other circulation area through the fluid inlet holes, and the phase holdup of two-phase flow can be obtained by measuring a capacitance value of an annular capacitor and combing correlation operation; by combining pressure differences of the fluid at the two ends of the inner tube, the fluid total flow can be obtained, and the separate phase flow rate can be obtained finally. According to the gas-liquid two-phase flow phase holdup and the separate phase flow rate detection device and detection method, the inner tube and the outer tube and a middle fluid forms capacitance, the capacitance value is only related to an intermediate medium, and therefore an influence of flow pattern changes to measurement of the two-phase flow holdup can be weakened.

The invention belongs to the multiphase flow measurement field, which mainly relates to the multiphase flow phase holdup measurement field and particularly discloses an oil-gas-water three-phase flow phase holdup measurement device which is based on an double helix capacitive sensor and can carry out precise measurement of the oil-gas-water three-phase flow holdup. The measurement device comprises at least one double helix capacitive sensor, a signal processing circuit, a weak capacitance measurement circuit and a moisture content measurement circuit which are respectively connected with the signal processing circuit, wherein, the double helix capacitive sensor is connected with the weak capacitance measurement circuit or the moisture content measurement circuit selectively; when a pipeline is filled with oil gas, the double helix capacitive sensor is connected with the weak capacitance measurement circuit, the signal processing circuit outputs the phase holdup of the oil; when the pipeline is filled with water, the double helix capacitive sensor is connected with the moisture content measurement circuit, and the signal processing circuit outputs the phase holdup of the water.

The application belongs to the technical field of flow measurement, and in particular relates to a multiphase flow fluid measurement system. The existing oil-gas-water three-phase flowmeter is harmful to the environment and the human body, and the subsequent cost is relatively high. The application provides a multiphase flow fluid measurement system, including a flowmeter module, a water cut module and a data acquisition and processing module, wherein the flowmeter module is connected to the water cut module, and the flowmeter module is connected to the data The collection and processing module is connected, and the water content module is connected with the data collection and processing module; the flowmeter module is used to measure the virtual high flow rate of the fluid; the water content module is used to measure the phase holdup of water; The data acquisition and processing module is used to calculate the flow of each phase after collecting data. The modular design of the sensor is convenient for adjusting the position of the sensor according to different measurement requirements, and can provide fast, stable and reliable measurement and detection results for oil and gas wells under different working conditions.

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.