Integrated light quantum mixed-phase flowmeter and mixed-phase fluid measuring method

Abstract

The invention provides an integrated light quantum mixed-phase flow meter and a mixed-phase fluid measurement method, relates to the technical field of industrial mixed-phase fluid measurement, and aims to solve the problem that an existing underwater flow meter is poor in measurement accuracy of a mixed-phase fluid medium in a deep-sea oil and gas well. The integrated light quantum mixed-phase flow meter comprises a flow meter body, a fluid metering channel penetrates through the center of the flow meter body, and the integrated light quantum mixed-phase flow meter is applied to a deep-sea oil-gas well. The flowmeter main body is a sealed cylinder, and two groups of electric connectors are arranged at the top of the flowmeter main body; the fluid metering channel comprises an inlet pipe section and a middle measuring pipe section, and the middle measuring pipe section is provided with an inner throttling body of a spindle structure; a plurality of sets of measuring systems are integrated on the flowmeter main body, and each set of measuring system is arranged between the fluid metering channel and a shell of the flowmeter main body and is used for measuring the flow of each phase medium in the mixed-phase fluid flowing through the inner-section fluid; a sealing partition plate is arranged on the side, away from the fluid metering channel, of each measuring system and used for isolating seawater.

Description

Technical Field

[0001] The present application relates to the technical field of industrial mixed-phase fluid measurement, and provides an integrated photon mixed-phase flowmeter and a mixed-phase fluid measurement method. Background Art

[0002] Underwater flowmeters are key equipment for measuring the exploitation status of deep-sea oil and gas wells. Unlike multiphase flowmeters generally used on land or on drilling platforms, underwater flowmeters need to face more severe marine environments. The corrosion of seawater on underwater flowmeters will result in poor measurement accuracy.

[0003] CN219244697U discloses an underwater flow meter, in which the pressure acquisition, transmission and receiving paths are all sealed in a cubic matrix. However, the underwater flow meter is only suitable for measuring single-phase fluid media, and is not suitable for measuring mixed-phase fluid media. The fluid media in deep-sea oil and gas wells are complex, and the measurement accuracy of single-phase flow meters for mixed-phase fluid media is poor.

[0004] Therefore, how to improve the measurement accuracy of mixed-phase fluid media in deep-sea oil and gas wells is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present application provides an integrated photon mixed phase flowmeter and a mixed phase fluid measurement method, which are used to solve the problem of poor measurement accuracy of existing underwater flowmeters for mixed phase fluid media in deep-sea oil and gas wells.

[0006] In a first aspect, an integrated photon mixed phase flowmeter is provided, comprising a flowmeter body, wherein a fluid metering channel is passed through the center of the flowmeter body, and the flowmeter body is applied to deep-sea oil and gas wells;

[0007] The flow meter body is a sealed cylinder, and two sets of electrical connectors are arranged on the top of the flow meter body;

[0008] The fluid metering channel comprises an inlet pipe section and an intermediate measuring pipe section, wherein the intermediate measuring pipe section is provided with an inner throttle body of a spindle structure;

[0009] The flow meter body is integrated with a plurality of measuring systems, each measuring system is arranged between the fluid metering channel and the outer shell of the flow meter body, and each measuring system is used to measure the flow rate of each phase medium in the mixed-phase fluid flowing through the inner throttle body;

[0010] A sealing baffle is arranged on a side of each measuring system away from the fluid metering channel, and the sealing baffle is used to isolate seawater.

[0011] Optionally, the sealing partition is made of stainless steel material, and the stainless steel material includes any one of F51 material, F53 material and F55 material.

[0012] Optionally, the flow meter body includes a multi-energy level photon source; the multi-energy level photon source is arranged inside the inner throttle body, and the multi-energy level photon source is used to generate photons of different energy levels;

[0013] Each measurement system integrates multi-parameter sensors, photon detectors and flow computers;

[0014] The photon detector is arranged opposite to the multi-energy-level photon source, and is used to measure the measured photon transmission quantity of the different energy levels under the influence of the mixed-phase fluid;

[0015] The multi-parameter sensor is used to measure the measured pressure value of the inlet pipe section and the measured pressure difference between the inlet pipe section and the intermediate measuring pipe section;

[0016] The flow computer is respectively connected to the multi-level photon source, the multi-parameter sensor and the photon detector for communication, and is used to calculate the flow rate of each phase medium in the mixed fluid according to the measured photon transmission quantity, the measured pressure value and the measured pressure difference value.

[0017] Optionally, the photon detector is integrated with a temperature sensor, and the temperature sensor is used to measure the actual temperature value of the mixed-phase fluid;

[0018] The flow computer is specifically used to correct the measured temperature value, correct the measured light quantum transmission quantity, and calculate the flow rate of each phase medium in the mixed fluid according to the corrected temperature value, the corrected light quantum transmission quantity, the measured pressure value and the measured pressure difference.

[0019] Optionally, the integrated photon mixed phase flowmeter is connected to the fluid pipeline by means of a flange connection.

[0020] In a second aspect, a mixed-phase fluid measurement method is provided, which is applied to the integrated photon mixed-phase flowmeter described in any one of the first aspects; the method comprises:

[0021] Calculating the flow rate of each phase medium in the mixed-phase fluid respectively by using multiple measurement systems;

[0022] According to the flow rates of the media of each phase calculated by the multiple measurement systems, the final flow rates of the media of each phase are obtained; wherein the flow rates include mass flow rate and / or volume flow rate.

[0023] Optionally, obtaining the final flow rate of each phase of the medium according to the flow rates of each phase of the medium calculated by the multiple measurement systems includes:

[0024] Taking an average value of the mass flow rates of the medium of each phase calculated by the multiple measurement systems to obtain a final mass flow rate of the medium of each phase;

[0025] The volume flow rates of the various phases of the medium calculated by the multiple measurement systems are averaged to obtain the final volume flow rate of the various phases of the medium.

[0026] Optionally, the flow rates of the various phases of the mixed-phase fluid are calculated respectively by using multiple measurement systems, including:

[0027] The flow computer of each measuring system performs the following steps:

[0028] Calculating the phase fraction of each phase medium in the mixed-phase fluid according to the measured light quantum transmission quantity;

[0029] Calculating a first average mixed density of the mixed-phase fluid at a cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid at a cross section of the middle measuring pipe section according to the measured temperature value and the measured pressure value;

[0030] Calculating the total mass flow rate of the mixed-phase fluid according to the first average mixed density, the second average mixed density and the measured pressure difference;

[0031] Obtaining the mass flow rate of each phase medium according to the total mass flow rate and the phase fraction of each phase medium;

[0032] The volume flow rate of each phase medium is calculated based on the mass flow rate of each phase medium and the density of each phase medium.

[0033] Optionally, calculating a first average mixed density of the mixed-phase fluid at a cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid at a cross section of the intermediate measuring pipe section according to the measured temperature value and the measured pressure value includes:

[0034] Inputting the measured temperature value into a temperature correction model to obtain a corrected temperature value; the temperature correction model is obtained based on temperature data of multiple simulations of different working conditions;

[0035] According to the corrected temperature value and the measured pressure value, a first average mixed density of the mixed-phase fluid in the cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid in the cross section of the middle measuring pipe section are calculated.

[0036] Optionally, the total mass flow rate of the mixed phase fluid is calculated as follows:

[0037] Q m =c×ρ2×S×u

[0038]

[0039] Among them, Q m is the total mass flow rate of the mixed-phase fluid, c is a preset constant; ρ2 represents the second average mixed density, ρ1 represents the first average mixed density, ΔP is used to represent the measured pressure difference, S is the area constant of the integrated photon mixed-phase flowmeter, and u is the flow velocity of the mixed-phase fluid.

[0040] Optionally, the phase fraction of each phase medium in the mixed phase fluid is calculated according to the measured light quantum transmission quantity, including:

[0041] According to the measured temperature value, the corrected temperature value and the measured photon transmission quantity, the corrected photon transmission quantity is calculated; the calculation formula of the corrected photon transmission quantity is as follows:

[0042] N=n×N'×K w ' / K w

[0043] Wherein, N is the corrected light quantum transmission quantity, N' is the measured light quantum transmission quantity, K w ' is the measured temperature value, K w is the corrected temperature value; n is the correction coefficient of the light quantum transmission quantity;

[0044] The phase fraction of each phase medium in the mixed-phase fluid is calculated according to the corrected light quantum transmission quantity.

[0045] Compared with the prior art, the beneficial effects of this application are as follows:

[0046] The present application provides an integrated photon mixed-phase flowmeter, comprising a flowmeter body, a fluid metering channel running through the center of the flowmeter body, and is applied to deep-sea oil and gas wells; the flowmeter body is a sealed cylinder, and an electrical connector is arranged on the top of the flowmeter body; the fluid metering channel comprises an inlet pipe section and an intermediate measuring pipe section, and the intermediate measuring pipe section is provided with an inner throttle body with a spindle structure; the flowmeter body is integrated with a plurality of measurement systems, each measurement system is arranged between the fluid metering channel and the outer shell of the flowmeter body, and each measurement system is used to measure the flow rate of each phase medium in the mixed-phase fluid flowing through the inner throttle body; a sealing partition is arranged on the side of each measurement system away from the fluid metering channel, and the sealing partition is used to isolate seawater.

[0047] The present application integrates multiple measurement systems into a cylindrical flow meter body. The integrated design makes the flow meter body smaller and easier to install. Each measurement system is equipped with a sealing baffle on the outside, which separates the seawater from the internal measurement system to prevent the seawater from corroding the measurement system and causing inaccurate measurement results, thereby ensuring the measurement accuracy of mixed-phase fluid media in deep-sea oil and gas wells. By simultaneously monitoring multiple measurement systems, the measurement error of a single measurement system can be avoided, which can further improve the accuracy of the measurement results. The present application sets up two sets of electrical connectors, which can extend their service life through redundant design. The two sets of electrical connectors can be used alternately, or they can be switched to another set of electrical connectors in time when one set of electrical connectors fails, to ensure normal data transmission and power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technical customer service personnel in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0049] Figure 1 The appearance of the integrated photon mixed phase flowmeter provided in the embodiment of the present application Figure 1 ;

[0050] Figure 2 The appearance of the integrated photon mixed phase flowmeter provided in the embodiment of the present application Figure 2 ;

[0051] Figure 3 A longitudinal cross-sectional view of the integrated photonic quantum mixed phase flowmeter provided in an embodiment of the present application;

[0052] Figure 4 A transverse cross-sectional view of the integrated photonic quantum mixed phase flowmeter provided in an embodiment of the present application;

[0053] Figure 5 A schematic diagram of the structure of a multi-parameter sensor provided in an embodiment of the present application;

[0054] Figure 6 A schematic flow chart of a mixed-phase fluid measurement method provided in an embodiment of the present application.

[0055] Markings in the figure: 1-flow meter body, 2-fluid metering channel, 3-electric connector, 4-internal throttling fluid, 5-measurement system, 6-sealing partition, 7-multi-level photon source, 8-multi-parameter sensor, 9-photon detector, 10-flow computer, 501-first pressure inlet hole, 502-second pressure inlet hole, 503-first strain gauge, 504-second strain gauge, 505-electrical signal transmission component. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technical customer service personnel in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily combined with each other. In addition, although the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in an order different from that here.

[0057] In order to solve the problem of poor measurement accuracy of existing underwater flow meters for mixed-phase fluid media in deep-sea oil and gas wells, an embodiment of the present application provides an integrated photon mixed-phase flow meter for use in deep-sea oil and gas wells.

[0058] Please refer to Figure 1 , is the appearance of the integrated photon mixed phase flowmeter provided in the embodiment of the present application Figure 1 , please refer to Figure 2 , is the appearance of the integrated photon mixed phase flowmeter provided in the embodiment of the present application Figure 2 .from Figure 1 and Figure 2 It can be seen that the integrated photon mixed phase flowmeter comprises a flowmeter body 1 , which is a sealed cylinder, and two groups of electrical connectors 3 are arranged on the top of the flowmeter body 1 .

[0059] Please refer to Figure 3 , which is a longitudinal cross-sectional view of the integrated photon mixed phase flowmeter provided in the embodiment of the present application, please refer to Figure 4 , is a cross-sectional view of the integrated photon mixed phase flowmeter provided in the embodiment of the present application. Figure 3 It can be seen that a fluid metering channel 2 runs through the center of the flow meter body 1. The interior of the fluid metering channel 2 includes an inlet pipe section and an intermediate measuring pipe section. The intermediate measuring pipe section is provided with an inner throttle body 4 with a spindle structure. Figure 4It can be seen that the flow meter body 1 integrates multiple measurement systems 5, each measurement system 5 is arranged between the fluid metering channel 2 and the outer shell of the flow meter body 1, and each measurement system 5 is used to measure the flow rate of each phase medium in the mixed fluid flowing through the fluid metering channel 2; each measurement system 5 is provided with a sealing partition 6 on the side away from the fluid metering channel 2, and the sealing partition 6 is used to isolate seawater.

[0060] In this embodiment, the inner throttle body 4 is a spindle structure with an uneven cross-section. When the mixed-phase fluid flows through the inner throttle body 4 with a changing cross-section, the change in flow velocity will affect the pressure of the mixed-phase fluid. According to the Bernoulli equation, in places with a large cross-section, the flow velocity decreases and the static pressure of the fluid increases. In places with a small cross-section, where the flow velocity increases, the static pressure of the fluid decreases, thereby forming a pressure difference.

[0061] Multiple measurement systems 5 can be integrated inside the flow meter body 1, and the number of measurement systems is not less than 3, such as 3. Multiple measurement systems 5 are symmetrically arranged in the flow meter body 1, with a high degree of integration, and can realize simultaneous measurement of multiple measurement systems 5. According to the measurement results of multiple measurement systems 5, the accuracy of the measurement results can be improved. Each measurement system 5 is equipped with a sealing baffle 6 on the outside, which can isolate the internal measurement system 5 from the external seawater, prevent the seawater from corroding the measurement system 5 and causing inaccurate measurement results, thereby ensuring the measurement accuracy of the mixed-phase fluid medium in deep-sea oil and gas wells. And the use of such a sealing structure can make the structure of the flow meter body 1 smaller and more convenient to install.

[0062] In this embodiment, the electrical connector 3 can transmit the measurement results and other parameters of the multiple measurement systems 5 to the data terminal, and provide power supply for the multiple measurement systems 5. The electrical connector 3 is set in two groups, which can be used alternately, and can also be switched to the other group of electrical connectors 3 in time when one group of electrical connectors 3 fails, to ensure normal data transmission and power supply.

[0063] In a possible embodiment, the integrated photon mixed phase flowmeter is connected to the fluid pipeline by means of a flange connection.

[0064] In this embodiment, the integrated photon mixed phase flowmeter is installed on the fluid pipeline, and the mixed phase fluid enters from the fluid pipeline below the flowmeter body 1, flows through the inner throttling body 4 in the fluid metering channel 2, flows out from the top of the flowmeter body 1, and re-enters the fluid pipeline.

[0065] The flange connection makes the installation and disassembly of the integrated photonic quantum mixed phase flowmeter very convenient. By loosening the bolts, the flowmeter can be quickly installed or removed without changing the pipeline. This feature is particularly important for maintenance and repair work. Flange connections are usually equipped with sealing gaskets (such as rubber gaskets or metal gaskets), which can effectively prevent fluid leakage and ensure the sealing between the integrated photonic quantum mixed phase flowmeter and the fluid pipeline. The flange connection can provide a stable and firm connection, so that the integrated photonic quantum mixed phase flowmeter can be reliably fixed on the fluid pipeline, reducing the impact of factors such as vibration and pressure fluctuations on the integrated photonic quantum mixed phase flowmeter, and ensuring the accuracy of the measurement results.

[0066] In a possible embodiment, the sealing partition 6 is made of stainless steel, and the stainless steel material includes any one of F51 material, F53 material and F55 material.

[0067] In this embodiment, the use of stainless steel material in the sealing partition provides it with advantages such as excellent corrosion resistance, mechanical strength, high temperature resistance, oxidation resistance and durability.

[0068] In a possible embodiment, please continue to refer to Figure 3 and Figure 4 The flow meter body 1 includes a multi-energy-level photon source 7; the multi-energy-level photon source 7 is arranged inside the inner throttle body 4, and the multi-energy-level photon source 7 is used to generate photons of different energy levels.

[0069] Each measurement system 5 is integrated with a multi-parameter sensor 8, a photon detector 9 and a flow computer 10; the photon detector 9 is arranged opposite to the multi-level photon source 7, and is used to measure the number of photon transmissions of different energy levels under the influence of a mixed-phase fluid; the multi-parameter sensor 8 is used to measure the measured pressure value of the inlet pipe section and the measured pressure difference between the inlet pipe section and the intermediate measuring pipe section; the flow computer 10 is respectively communicated with the multi-level photon source 7, the multi-parameter sensor 8 and the photon detector 9, and the flow computer 10 is used to calculate the flow rate of each phase medium in the mixed-phase fluid according to the number of photon transmissions, the measured pressure value and the measured pressure difference.

[0070] In the specific implementation process, the sealing partition 6 is placed in an annular shape outside the photon detector 9 and the multi-parameter sensor 8, and the multi-level photon source 7 can emit photons of at least three energy levels according to a preset emission rate, and pass through the mixed-phase fluid in the inner throttling body 4 in a transmission manner to enter the photon detector 9 in each measurement system 5. The photon detector 9 can capture the incoming photons, measure the measured photon transmission quantity of different energy levels under the influence of the mixed-phase fluid in real time, and send it to the flow computer 10. For a specific medium, photons of different energies have different absorption probabilities, and different media have different absorption characteristics. Therefore, by analyzing the transmission quantity of photons of at least three energy levels, the phase fraction of each phase medium in the mixed-phase fluid can be calculated.

[0071] When the mixed phase fluid flows through the inner throttle body 4, the multi-parameter sensor 8 can measure the measured pressure value of the inlet pipe section and the measured pressure difference between the inlet pipe section and the intermediate measuring pipe section, and send them to the flow computer 10. Please refer to Figure 5 , is a schematic diagram of the structure of the multi-parameter sensor provided in the embodiment of the present application, the multi-parameter sensor 8 includes a first pressure-introducing hole 501, a second pressure-introducing hole 502, a first strain gauge 503, a second strain gauge 504, and an electrical signal transmission component 505. When the mixed-phase fluid flows through the first pressure-introducing hole 501, the resistance of the first strain gauge 503 changes, and when the mixed-phase fluid flows through the second pressure-introducing hole 502, the resistance of the second strain gauge 504 changes, thereby converting the measured pressure value and the measured pressure difference into electrical signals, which are transmitted to the flow computer 10 through the electrical signal transmission component 505.

[0072] Different from the prior art which uses a narrow light beam to measure the gamma ray radiation source, the multi-level photon source 7 in the embodiment of the present application uses a Ba-133 photon source, which has a radioactivity of 25 microcuries and is a non-radioactive exempt source. The measurement method is full-section measurement, and the measurement result is more accurate.

[0073] Different from non-external transmitters, the multi-parameter sensor 8 in this embodiment has shorter electrical connection cables, lower installation requirements, smaller test interfaces, and easier internal wiring. Traditional multiphase flowmeter components are fragmented, and the measuring components are separate rather than integrated. In this embodiment, the multi-parameter sensor, flow computer, photon detector and other measuring components are integrated into each measurement system. The integrated design eliminates the need for separate corrosion protection for each component, and only requires corrosion protection for the liquid contact (part in contact with the measuring medium), so that the structure of each component can be designed as a smaller structure, and the volume of the integrated photon mixed phase flowmeter can be reduced by more than 50%.

[0074] In a possible embodiment, the photon detector 9 is integrated with a temperature sensor, which is used to measure the measured temperature value of the mixed-phase fluid; the flow computer 10 is specifically used to correct the measured temperature value and the measured photon transmission quantity, and calculate the flow rate of each phase medium in the mixed-phase fluid according to the corrected temperature value, the corrected photon transmission quantity, the measured pressure value and the measured pressure difference.

[0075] In order to ensure the accuracy of temperature measurement, higher-precision temperature sensors, more accurate measurement methods (for example, putting the temperature sensor in direct contact with the fluid will make the structure complicated and cause problems with uneven sampling), and better insulation structures are needed. This will undoubtedly increase the cost and size of the flow meter, which is not conducive to deep-sea application scenarios.

[0076] In this embodiment, the temperature sensor is integrated inside the photon detector 9, and the temperature of the mixed phase fluid can be measured. Since the phase fraction is measured by energy spectrum counting, the temperature has a great influence on the energy spectrum counting. In order to ensure the accuracy of the measurement, it is usually necessary to set a heat preservation structure for the photon detector 9 to ensure the accuracy of the measurement. In this embodiment, the photon detector 9 does not need a heat preservation structure, and the measured temperature value and the measured photon projection number are transmitted to the flow computer 10. Based on the previous experimental data, theoretical analysis and system requirements, a suitable temperature correction model is selected to correct the measured temperature value, compensate for the temperature deviation caused by environmental changes or other factors, and at the same time, the measured photon transmission number is corrected based on the corrected temperature value. In this way, the output temperature can be made closest to the actual working temperature, and the inaccurate measurement result caused by the temperature offset of the energy spectrum counting can be avoided. In addition, the photon detector 9 omits a complex heat preservation structure, and is easier to be installed in the limited space of the integrated photon mixed phase flowmeter, making the overall structure of the integrated photon mixed phase flowmeter more compact.

[0077] In summary, the integrated photon mixed phase flowmeter provided in the embodiment of the present application integrates components such as a multi-level photon source 7, a multi-parameter sensor 8, a photon detector 9, and a flow computer 10 in a cylindrical flowmeter body 1, and has a high degree of integration. The flowmeter body 1 is separated from the outside world by a sealing partition, and is installed on a fluid pipeline, which can realize direct measurement of mixed phase fluids and is suitable for dynamic metering and monitoring of deep-sea oil and gas wellheads in seawater. The internal design of the flowmeter body 1 is a structure that can integrate at least 3 sets of measurement systems 5, and can realize simultaneous monitoring of multiple sets of measurement systems 5, with a high degree of integration, but the main structure is compact and has wide applicability.

[0078] Based on the same inventive concept, the present application also provides a mixed phase fluid measurement method, which is applied to Figure 1-Figure 4 The integrated photon mixed phase flow meter shown in Figure 2 is shown in Figure 2. Figure 6, which is a flow chart of a mixed-phase fluid measurement method provided in an embodiment of the present application.

[0079] S601. Calculate the flow rate of each phase medium in the mixed-phase fluid respectively through multiple measurement systems.

[0080] S602. Obtain the final flow rate of each phase of the medium according to the flow rate of each phase of the medium calculated by multiple sets of measurement systems.

[0081] In the embodiment of the present application, the flow rate includes mass flow rate and / or volume flow rate. Multiple measurement systems can simultaneously calculate the flow rate of each phase medium in a mixed phase fluid from different angles, which can provide more comprehensive data, reduce the risk caused by failure or error of a single measurement system, identify and correct potential measurement problems by comparing the measurement results of different measurement systems, and improve the measurement accuracy of mixed phase fluids in deep-sea oil and gas wells.

[0082] In a possible embodiment, the flow computer of each measurement system performs the following steps:

[0083] According to the measured light quantum transmission quantity, the phase fraction of each phase medium in the mixed-phase fluid is calculated; according to the measured temperature value and the measured pressure value, the first average mixing density of the mixed-phase fluid on the cross section of the inlet pipe section and the second average mixing density of the mixed-phase fluid on the cross section of the middle measuring pipe section are calculated; according to the second average mixing density, the first average mixing density and the measured pressure difference, the total mass flow rate of the mixed-phase fluid is calculated; according to the total mass flow rate and the phase fraction of each phase medium, the mass flow rate of each phase medium is obtained; according to the mass flow rate of each phase medium and the density of each phase medium, the volume flow rate of each phase medium is calculated.

[0084] In the specific implementation process, the total mass flow rate of the mixed phase fluid is calculated as follows:

[0085] Q m =c×ρ2×S×u

[0086]

[0087] Among them, Q m is the total mass flow rate of the mixed-phase fluid, c is a preset constant; ρ2 represents the first average mixing density of the mixed-phase fluid on the cross section of the inlet pipe section, ρ1 represents the second average mixing density of the mixed-phase fluid on the cross section of the middle measuring pipe section, ΔP is used to represent the measured pressure difference between the inlet pipe section and the middle measuring pipe section, S is the area constant of the integrated photon mixed-phase flowmeter, and u is the flow velocity of the mixed-phase fluid.

[0088] The calculation formula for the mass flow rate of each phase medium in a mixed fluid is as follows:

[0089] Q i =mi ×Q m

[0090] Among them, Q m is the total mass flow rate of the mixed phase fluid, m i is the phase fraction of the i-th phase medium of the mixed phase fluid, Q i is the mass flow rate of the i-th phase medium.

[0091] The calculation formula for the volume flow rate of each phase medium in a mixed fluid is as follows:

[0092] V i =ρ i ×Q i

[0093] Among them, Q i is the mass flow rate of the i-th phase medium, ρ i is the density of the i-th phase medium, V i is the volume flow rate of the i-th phase medium in the mixed fluid.

[0094] In a possible embodiment, calculating a first average mixed density of the mixed-phase fluid on a cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid on a cross section of the middle measuring pipe section according to the measured temperature value and the measured pressure value includes:

[0095] The measured temperature value is input into the temperature correction model to obtain a corrected temperature value; the temperature correction model is obtained based on temperature data of multiple simulations of different working conditions; according to the corrected temperature value and the measured pressure value, the first average mixing density of the mixed-phase fluid on the cross section of the inlet pipe section and the second average mixing density of the mixed-phase fluid on the cross section of the middle measuring pipe section are calculated.

[0096] In the specific implementation process, a suitable temperature correction model (such as a linear correction model, a nonlinear correction model) is selected, and different working conditions and different temperatures are simulated for the integrated photon mixed phase flowmeter for multiple times, and the measured temperature value actually measured by the photon detector is monitored to obtain multiple sets of temperature data, each set of temperature data includes a measured temperature value and a measured temperature value corresponding to the measured temperature value. According to the error between the measured temperature value and the corresponding measured temperature value, the parameters of the temperature correction model (such as the temperature correction coefficient) are adjusted until the error between the measured temperature value and the measured temperature value is less than the preset error, and the temperature correction model is obtained. In practical applications, the measured temperature value actually measured by the photon detector is substituted into the temperature correction model to obtain a corrected temperature value.

[0097] For example, the linear correction model is formulated as follows:

[0098] K w =kK w '

[0099] Among them, K w is the corrected temperature value, K w ' is the measured temperature value, k is the temperature correction coefficient, which can be obtained based on multiple simulations of temperature data under different working conditions.

[0100] Or for example, the formula for the nonlinear correction model is as follows:

[0101] K w =f(K w ')

[0102] Among them, K w is the corrected temperature value, K w ' is the measured temperature value, and f() is a nonlinear function that can be obtained based on multiple simulations of temperature data under different working conditions.

[0103] In a possible embodiment, the phase fraction of each phase medium in the mixed phase fluid is calculated according to the measured light quantum transmission quantity, including:

[0104] The corrected light quantum transmission quantity is calculated according to the measured temperature value, the corrected temperature value and the measured light quantum transmission quantity; and the phase fraction of each phase medium in the mixed phase fluid is calculated according to the corrected light quantum transmission quantity.

[0105] In the specific implementation process, the integrated photon mixed phase flowmeter simulates different working conditions and different temperatures for many times, monitors the actual temperature value measured by the photon detector 9, and monitors the actual photon projection quantity measured by the photon detector 9, and obtains multiple sets of data, each set of data includes the measured temperature value, the measured temperature value, the measured photon projection quantity, and the actual photon projection quantity. The photon transmission quantity correction coefficient is obtained by fitting the multiple sets of data. In practical applications, the corrected photon transmission quantity can be obtained by substituting the following formula.

[0106] The calculation formula for correcting the number of photon transmission is as follows:

[0107] N=n×N'×K w ' / K w

[0108] Among them, N is the corrected light quantum transmission number, N' is the measured light quantum transmission number, K w ' is the measured temperature value, K w is the corrected temperature value; n is the correction coefficient for the number of light quantum transmission.

[0109] Furthermore, when a light quantum propagates in a substance, its intensity will gradually weaken. The flow computer 10 can calculate the phase fraction of each phase medium in the mixed-phase fluid according to the light quantum attenuation law and the modified light quantum transmission quantity.

[0110] The following describes how to calculate the first average mixed density of the mixed-phase fluid on the cross section of the inlet pipe section and the second average mixed density of the mixed-phase fluid on the cross section of the middle measuring pipe section according to the corrected temperature value and the measured pressure value. The specific steps are as follows:

[0111] S1.1. According to the measured pressure value and the corrected temperature value, the first gas density of the gas phase medium in the mixed fluid at the inlet pipe section is calculated based on the ideal gas state equation.

[0112] S1.2. Calculate the second gas density of the gas phase medium in the mixed-phase fluid at the middle measuring pipe section according to the measured pressure value, the corrected temperature value and the measured pressure difference value.

[0113] The measured pressure value is subtracted from the measured pressure difference to obtain the expected pressure value of the gas phase medium in the mixed fluid at the middle measuring pipe section. The expected temperature value of the gas phase medium in the mixed fluid at the middle measuring pipe section is calculated based on the expected pressure value, the measured pressure value, and the corrected temperature value. The second gas density of the gas phase medium in the mixed fluid at the middle measuring pipe section is calculated based on the ideal gas state equation according to the expected pressure value and the expected temperature value.

[0114] According to the ideal gas equation, the following formula can be obtained:

[0115]

[0116] Among them, P w is the working gas pressure, P s is the standard gas pressure, i.e. 101325Pa, K s is the standard thermodynamic temperature, i.e. 293.15K, K w is the operating thermodynamic temperature, Z gs is the gas standard compressibility factor, Z gw is the gas operating compressibility factor, ρ gs is the density of the gas at standard conditions (293.15K, 101325Pa), ρ gw is the working density of gas.

[0117] When P w is the measured pressure value, K w When the temperature is corrected, the calculated ρ gw is the first gas density of the gas phase medium in the mixed phase fluid at the inlet pipe section. w is the expected pressure value, K w When the expected temperature is gw It is the second gas density of the gas phase medium in the mixed fluid at the middle measuring pipe section.

[0118] S1.3. Calculate the first average mixing density of the mixed-phase fluid on the cross section of the inlet pipe section based on the corrected photon transmission number and the medium-free photon transmission number.

[0119]

[0120] Among them, ρ1 is the first average mixing density, N0 is the number of light quanta transmitted without medium, N is the number of corrected light quanta transmitted, and M is the Compton scattering coefficient.

[0121] S1.4. Calculate the second average mixed density of the mixed fluid on the cross section of the middle measuring pipe section based on the actual density value of the non-gaseous medium in the mixed fluid, the first average mixed density, the second gas density, the first gas density, and the respective cross-sectional areas of the inlet pipe section and the middle measuring pipe section.

[0122] The actual volume gas content is calculated according to the formula "first average mixed density = first gas density × actual volume gas content + actual density value × (1-actual volume gas content)".

[0123] Target volumetric gas content = 1-(cross-sectional area of ​​the inlet pipe section ÷ cross-sectional area of ​​the middle measuring pipe section) × (1-actual volumetric gas content).

[0124] The second average mixed density = the second gas density × the target volume gas content + the actual density value × (1□the target volume gas content).

[0125] Considering that a mixed-phase fluid usually contains a gas phase medium, the density of the gas phase medium needs to be calculated using the ideal gas state equation. The gas is compressible, and the density of the gas phase medium is different at different temperatures. Inaccurate density calculation of the gas phase medium will lead to inaccurate subsequent flow calculation. Therefore, in the embodiment of the present application, the measured temperature value is corrected. The corrected accurate temperature value can reduce the calculation deviation caused by the temperature error, thereby making the flow of the mixed-phase fluid calculated by the temperature value more accurate.

[0126] In a possible embodiment, the mass flow rates of each phase of the medium calculated by multiple measurement systems are averaged to obtain the final mass flow rate of each phase of the medium; the volume flow rates of each phase of the medium calculated by multiple measurement systems are averaged to obtain the final volume flow rate of each phase of the medium.

[0127] In the embodiment of the present application, considering that each measurement system may have some random errors, averaging the measurement results of multiple measurement systems can reduce the impact of these errors and improve the measurement accuracy of mixed-phase fluid media in deep-sea oil and gas wells.

[0128] In another possible embodiment, the intermediate value of the mass flow rate of each phase medium calculated by multiple sets of measurement systems is taken to obtain the final mass flow rate of each phase medium; the intermediate value of the volume flow rate of each phase medium calculated by multiple sets of measurement systems is taken to obtain the final volume flow rate of each phase medium.

[0129] In the embodiment of the present application, the median is not sensitive to outliers or extreme data. If a measurement system generates outliers for some reason, the median can effectively eliminate the influence of these outliers, thereby providing more reliable measurement results.

[0130] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0131] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0132] Through the description of the above implementation methods, technical customer service personnel in this field can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a disk, or an optical disk), and includes a number of instructions for a multimedia terminal device (which can be a mobile phone, a computer, a television receiver, or a network device, etc.) to execute the methods of each embodiment of the present application.

[0133] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An integrated photon mixed phase flowmeter, comprising a flowmeter body, wherein a fluid metering channel runs through the center of the flowmeter body, characterized in that: Applied in deep sea oil and gas wells; The flow meter body is a sealed cylinder, and two sets of electrical connectors are arranged on the top of the flow meter body; The fluid metering channel comprises an inlet pipe section and an intermediate measuring pipe section, wherein the intermediate measuring pipe section is provided with an inner throttle body of a spindle structure; The flow meter body is integrated with a plurality of measuring systems, each measuring system is arranged between the fluid metering channel and the outer shell of the flow meter body, and each measuring system is used to measure the flow rate of each phase medium in the mixed-phase fluid flowing through the inner throttle body; A sealing baffle is arranged on a side of each measuring system away from the fluid metering channel, and the sealing baffle is used to isolate seawater.

2. The integrated photon mixed phase flowmeter according to claim 1, characterized in that: The sealing partition is made of stainless steel material, and the stainless steel material includes any one of F51 material, F53 material and F55 material.

3. The integrated photon mixed phase flowmeter according to claim 1, characterized in that: The flow meter body includes a multi-level photon source; the multi-level photon source is arranged inside the inner throttle body, and the multi-level photon source is used to generate photons of different energy levels; Each measurement system integrates multi-parameter sensors, photon detectors and flow computers; The photon detector is arranged opposite to the multi-energy-level photon source, and is used to measure the measured photon transmission quantity of the different energy levels under the influence of the mixed-phase fluid; The multi-parameter sensor is used to measure the measured pressure value of the inlet pipe section and the measured pressure difference between the inlet pipe section and the intermediate measuring pipe section; The flow computer is respectively connected to the multi-level photon source, the multi-parameter sensor and the photon detector for communication, and is used to calculate the flow rate of each phase medium in the mixed fluid according to the measured photon transmission quantity, the measured pressure value and the measured pressure difference value.

4. The integrated photon mixed phase flowmeter as claimed in claim 3, characterized in that: The photon detector is integrated with a temperature sensor, and the temperature sensor is used to measure the measured temperature value of the mixed phase fluid; The flow computer is specifically used to correct the measured temperature value, correct the measured light quantum transmission quantity, and calculate the flow rate of each phase medium in the mixed fluid according to the corrected temperature value, the corrected light quantum transmission quantity, the measured pressure value and the measured pressure difference.

5. The integrated photon mixed phase flowmeter according to claim 1, characterized in that: The integrated photon mixed phase flowmeter is connected to the fluid pipeline by means of a flange connection.

6. A method for measuring a mixed phase fluid, characterized in that: Applied to the integrated photonic quantum mixed phase flowmeter described in any one of claims 1 to 5; the method comprises: Calculating the flow rate of each phase medium in the mixed-phase fluid respectively by using multiple measurement systems; According to the flow rates of the media of each phase calculated by the multiple measurement systems, the final flow rates of the media of each phase are obtained; wherein the flow rates include mass flow rate and / or volume flow rate.

7. The method for measuring a mixed phase fluid according to claim 6, characterized in that: According to the flow rates of the various phase media calculated by the multiple measurement systems, the final flow rates of the various phase media are obtained, including: Taking an average value of the mass flow rates of the medium of each phase calculated by the multiple measurement systems to obtain a final mass flow rate of the medium of each phase; The volume flow rates of the various phases of the medium calculated by the multiple measurement systems are averaged to obtain the final volume flow rate of the various phases of the medium.

8. The method for measuring a mixed phase fluid according to claim 6, characterized in that: The flow rates of the various phases of the mixed-phase fluid are calculated respectively by using multiple measurement systems, including: The flow computer of each measuring system performs the following steps: Calculating the phase fraction of each phase medium in the mixed-phase fluid according to the measured light quantum transmission quantity; Calculating a first average mixed density of the mixed-phase fluid at a cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid at a cross section of the middle measuring pipe section according to the measured temperature value and the measured pressure value; Calculating the total mass flow rate of the mixed-phase fluid according to the first average mixed density, the second average mixed density and the measured pressure difference; Obtaining the mass flow rate of each phase medium according to the total mass flow rate and the phase fraction of each phase medium; The volume flow rate of each phase medium is calculated based on the mass flow rate of each phase medium and the density of each phase medium.

9. The method for measuring a mixed phase fluid according to claim 8, characterized in that: Calculating a first average mixed density of the mixed-phase fluid on a cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid on a cross section of the intermediate measuring pipe section according to the measured temperature value and the measured pressure value, comprising: Inputting the measured temperature value into a temperature correction model to obtain a corrected temperature value; the temperature correction model is obtained based on temperature data of multiple simulations of different working conditions; According to the corrected temperature value and the measured pressure value, a first average mixed density of the mixed-phase fluid in the cross section of the inlet pipe section and a second average mixed density of the mixed-phase fluid in the cross section of the middle measuring pipe section are calculated.

10. The method for measuring a mixed phase fluid according to claim 9, characterized in that: The calculation formula of the total mass flow rate of the mixed phase fluid is as follows: Q m =c×ρ2×S×u Among them, Q m is the total mass flow rate of the mixed-phase fluid, c is a preset constant; ρ2 represents the second average mixed density, ρ1 represents the first average mixed density, ΔP is used to represent the measured pressure difference, S is the area constant of the integrated photon mixed-phase flowmeter, and u is the flow velocity of the mixed-phase fluid.

11. The method for measuring a mixed phase fluid according to claim 9, characterized in that: According to the measured light quantum transmission quantity, the phase fraction of each phase medium in the mixed phase fluid is calculated, including: According to the measured temperature value, the corrected temperature value and the measured photon transmission quantity, the corrected photon transmission quantity is calculated; the calculation formula of the corrected photon transmission quantity is as follows: N=n×N'×K w ' / K w Wherein, N is the corrected light quantum transmission quantity, N' is the measured light quantum transmission quantity, K w ' is the measured temperature value, K w is the corrected temperature value; n is the correction coefficient of the light quantum transmission quantity; The phase fraction of each phase medium in the mixed-phase fluid is calculated according to the corrected light quantum transmission quantity.

Images