Gas-gas mixed-phase multi-tube-bundle resonant mass flow metering device and metering method

Abstract

The invention relates to the technical field of metering, and discloses a gas-gas mixed-phase multi-tube-bundle resonant mass flow metering device and a gas-gas mixed-phase multi-tube-bundle resonant mass flow metering method. A gas-gas mixed-phase multi-tube-bundle resonant mass flow metering device comprises a flow meter body, a multi-parameter transmitter and a flow computer, wherein the multi-parameter transmitter and the flow computer are connected to the flow meter body. An inner cavity of the flow meter main body is filled with an anti-freezing solution, and a plurality of resonance tubes for draining fluid to pass through are arranged in the inner cavity in a penetrating manner; the resonant tube is arranged along the length of the flowmeter main body, and a resonant excitation source for exciting the resonant tube is fixedly connected to the resonant tube; a measuring module is fixedly arranged in an inner cavity of the flow meter body. The inner cavity of the flowmeter body is filled with high-pressure anti-freezing liquid, it is guaranteed that the multi-beam resonance tube can normally work in the high-pressure environment, the mode of actively exciting the resonance tube is adopted, and carbon dioxide and natural gas are metered through a gas-gas mixed-phase multi-tube-beam resonance mass flow metering method; therefore, the mass flow metering device has better applicability and test precision.

Description

Technical Field

[0001] The invention relates to the field of metering technology, and in particular to a gas-gas mixed phase multi-tube bundle resonant mass flow metering device and a metering method. Background Art

[0002] With the rapid development of global oil and gas development technology, the demand for mixed phase flow measurement in the oil and gas production process is becoming more and more urgent. In order to reduce greenhouse gas emissions, oil and gas fields are exploring pilot projects for CO2 flooding to enhance oil recovery. The ground metering system is required to be able to perform online real-time mixed phase flow measurement of CO2 and natural gas without separation.

[0003] Among them, CO2 flooding is a new technology to improve oil well recovery. CO2 flooding technology is to inject CO2 into the oil reservoir and use the physical properties of CO2 to develop the oil reservoir again; push the oil in the oil reservoir from underground to the surface. This technology will cause the natural gas, CO2, impurities and formation water contained in the oil reservoir to be discharged together. The measurement of the content of economically valuable oil, natural gas and CO2 is a key factor in evaluating whether the oil reservoir has development potential. Since the above technology will form a complex mixed medium in application, it is difficult to measure the flow of CO2 and natural gas under the condition that the mixed medium is not separated. Summary of the invention

[0004] The present application provides a gas-gas mixed phase multi-tube bundle resonant mass flow metering device and a metering method to solve the above-mentioned technical problem of the high difficulty in flow metering of carbon dioxide and natural gas under the condition that the mixed medium is not separated in the prior art.

[0005] According to one aspect of the present application, an embodiment provides a multi-tube bundle resonant mass flow metering device for a gas-gas mixed phase, comprising: a flow meter body; also comprising a multi-parameter transmitter and a flow computer connected to the flow meter body; the inner cavity of the flow meter body is filled with antifreeze liquid, and the inner cavity is penetrated by a plurality of resonant tubes through which drainage fluid passes; the resonant tubes are arranged along the length of the flow meter body, and a resonant excitation source for exciting the resonant tubes is fixedly connected to the resonant tubes; a measuring module is fixedly arranged in the inner cavity of the flow meter body.

[0006] In one embodiment, resonance pipe joints are provided at both ends of the flow meter body; and the ends of the resonance pipe are connected to the resonance pipe joints.

[0007] In one embodiment, the resonance pipe joint extends out of the end of the flow meter body and is connected to a flange.

[0008] In one embodiment, the gas-gas mixed phase multi-tube bundle resonant mass flow metering device further includes a pressure taking tube; the first end of the pressure taking tube is connected to the resonant tube joint, and the second end is connected to the multi-parameter transmitter.

[0009] In one embodiment, three resonance tubes are provided.

[0010] In one embodiment, a pillow block is fixedly connected to the resonance tube.

[0011] In one embodiment, the pillow block is connected to the end of the resonance tube, and the pillow blocks at both ends of the resonance tube remain consistent.

[0012] In one embodiment, the measurement module includes a temperature measurement module and / or a frequency sensor.

[0013] In one embodiment, a protective cover is fixedly connected to the outside of the flow meter body.

[0014] According to one aspect of the present application, an embodiment provides a method for measuring the multi-tube bundle resonant mass flow rate of a gas-gas mixed phase based on the multi-tube bundle resonant mass flow rate metering device for a gas-gas mixed phase as described in any one of the above items, characterized in that it includes the following steps:

[0015] S1, the total mass flow rate Q of the gas-gas two-phase flow medium is measured by a multi-tube bundle resonant mass flow metering device for gas-gas mixed phase tm and the mixture density ρ mix ;

[0016] S2. Calculate the carbon dioxide volume fraction CVF under working conditions.

[0017]

[0018] And calculate the carbon dioxide mass fraction CMF,

[0019]

[0020] S3. Calculate the carbon dioxide gas mass flow rate Q mco2 ,

[0021] Q mco2 =Q tm *CMF (9);

[0022] And calculate the natural gas mass flow rate Q mng ,

[0023] Q mng =Q tm *(1-CMF) (10);

[0024] Among them, ρ aco2 is the working carbon dioxide density; ρ ang is the operating natural gas density.

[0025] The above-mentioned gas-gas mixed phase multi-tube bundle resonant mass flow metering device of the present application is used for gas-gas two-phase testing in the oil and gas industry. The inner cavity of the flow meter body is filled with high-pressure antifreeze to ensure that the multi-bundle resonant tube can work normally in a high-pressure environment. The active excitation resonant tube method is adopted to measure carbon dioxide and natural gas through the gas-gas mixed phase multi-tube bundle resonant mass flow metering method, so that the mass flow metering device has better applicability and testing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a multi-tube bundle resonant mass flow metering device for gas-gas mixed phase in an embodiment;

[0027] Figure 2 yes Figure 1 A side view schematic diagram of

[0028] Figure 3 yes Figure 1 A half-section diagram of

[0029] Figure 4 yes Figure 1 or Figure 3 Schematic cross-section diagram;

[0030] Figure 5 is a half-section schematic diagram of a multi-tube bundle resonant mass flow metering device for gas-gas mixed phase in an embodiment;

[0031] Figure 6 The diagram is a schematic diagram of a dynamic detection of a sample by a multi-tube bundle resonant mass flow metering device for a gas-gas mixed phase in an embodiment;

[0032] Reference numerals:

[0033] 1- flow meter body; 2- flow computer; 3- multi-parameter transmitter; 4- resonance tube; 5- pressure tube; 6- antifreeze; 7- flange; 8- resonance pipe joint; 9- pillow block; 10- temperature measurement module; 11- frequency sensor; 12- resonance excitation source. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first", "second" etc. in the present application are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged in appropriate circumstances, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0037] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element. Moreover, in this application, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0038] Embodiment 1

[0039] Please refer to Figure 1-Figure 6 The present application provides a multi-tube bundle resonant mass flow metering device for a gas-gas mixed phase, comprising: a flow meter body 1, a multi-parameter transmitter 3 and a flow computer 2 connected to the flow meter body 1; the inner cavity of the flow meter body 1 is filled with antifreeze liquid 6, and a plurality of resonant tubes 4 through which drainage fluid passes are penetrated in the inner cavity; the resonant tubes 4 are arranged along the length of the flow meter body 1, and a resonant excitation source 12 for exciting the resonant tubes 4 is fixedly connected to the resonant tubes 4; a measuring module is fixedly arranged in the inner cavity of the flow meter body 1.

[0040] In one embodiment, resonance tube joints 8 are provided at both ends of the flow meter body 1; the ends of the resonance tube 4 are connected to the resonance tube joints 8. The two ends of the inner cavity of the flow meter body 1 are blocked by the resonance tube joints 8, and antifreeze 6 can be injected into the inner cavity. The antifreeze 6 is in the cavity formed between the flow meter body 1 and the resonance tube 4, and a certain initial pressure is given to it during packaging. In this way, it can be achieved that a single resonance tube 4 can withstand a pressure of 10MPa. With the assistance of the pressurized antifreeze 6 and the flow meter body 1 that can withstand high pressure, the pressure greater than 10MPa flowing through the resonance tube 4 is safe and reliable.

[0041] In one embodiment, the resonance pipe joint 8 extends out of the end of the flow meter body 1 and is connected to the flange 7. The flange 7 is used to connect the test pipeline.

[0042] In one embodiment, the gas-gas mixed phase multi-tube bundle resonant mass flow metering device further includes a first end connected to the resonance pipe joint 8, and a second end connected to the pressure-taking pipe 5 of the multi-parameter transmitter 3. That is, the resonance pipe joint 8 provides an installation position for the pressure-taking pipe 5, the resonance pipe joint 8 is welded to the resonance tube 4, the flow meter body 1 is welded to the resonance pipe joint 8, and can withstand the pressure transmitted by the pipeline.

[0043] In one embodiment, three resonance tubes 4 are provided. Of course, other numbers of multiple resonance tubes 4 may also be provided. Figure 2 or Figure 4 .

[0044] In one embodiment, a pillow block 9 is fixedly connected to the resonance tube 4. Preferably, the pillow block 9 is connected to the end of the resonance tube 4, and the pillow blocks 9 at both ends of the resonance tube 4 are consistent.

[0045] In one embodiment, the measurement module includes a temperature measurement module 10 and / or a frequency sensor 11 .

[0046] In one embodiment, the flow meter body 1 is externally fixedly connected to a protective cover.

[0047] The above-mentioned gas-gas mixed phase multi-tube bundle resonant mass flow metering device is used for gas-gas two-phase testing in the oil and gas industry. Taking the use of 3-bundle resonant tubes 4 as an example (more 4-bundle resonant tubes can be used to meet the needs of large diameter and large flow), the resonant tubes 4 and the shell (i.e., the inner cavity of the flow meter body 1) are filled with high-pressure antifreeze 6 to ensure that the resonant tubes 4 can work normally in a high-pressure environment. Active excitation of the resonant tubes 4 is used to make the mass flow metering device have better applicability and test accuracy.

[0048] The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase can test the mass flow of carbon dioxide and natural gas in the pipeline and meet the measurement accuracy actually required on site. Figure 6The schematic diagram of a dynamic detection of a sample by a multi-tube bundle resonant mass flow metering device for a gas-gas mixed phase is shown. Furthermore, it can adapt to different pressures and can meet pipeline pressures of 0MPa to 42MPa. According to the designed structure size, it can also adapt to different calibers.

[0049] Embodiment 2

[0050] Please refer to Figure 1-Figure 5 An embodiment provides a multi-tube bundle resonant mass flow metering device for gas-gas mixed phase, wherein flanges 7 at both ends of the flow meter body 1 are connected to the test pipeline. The device mainly comprises a flow meter body 1, a flow computer 2, a multi-parameter transmitter 3, a multi-tube bundle resonant tube 4, a pressure pipe 5, etc. The overall structure is simple, and the connection with the test pipeline is convenient. The gas-gas two-phase medium is tested and the measurement is accurate.

[0051] Specifically. Flange 7 is connected to the test pipeline, resonance pipe joint 8 provides the installation position of pressure taking pipe 5, resonance pipe joint 8 is welded with resonance tube 4, flow meter body 1 is welded with resonance pipe joint 8, and can withstand the pressure transmitted by the pipeline. Antifreeze 6 is filled in flow meter body 1 and outside resonance tube 4, that is, antifreeze 6 is filled in the cavity formed between flow meter body 1 and resonance tube 4, and a certain initial pressure is given to it during packaging. In this way, a single resonance tube 4 can withstand a pressure of 10MPa. With the assistance of pressurized antifreeze 6 and a main body that can withstand high pressure, the pressure greater than 10MPa flowing through the resonance tube 4 is safe and reliable. This mass flow metering device gives resonance tube 4 a natural frequency by determining the physical parameters such as material, outer diameter, wall thickness of resonance tube 4, and adding the position of pillow blocks 9 (two blocks at each end, a total of four blocks) fixed at both ends of resonance tube 4. During measurement, the excitation source excites the resonance tube 4, so that the resonance tube 4 generates a certain frequency and amplitude; different pressures and media at different temperatures have different performances when passing through the resonance tube 4. The flow computer 2 receives the signal of the frequency sensor 11 during the resonant oscillation, the pressure signal of the multi-parameter transmitter 3, and the temperature signal of the temperature measurement module 10, analyzes them, and calculates the flow rate of the test medium.

[0052] Embodiment 3

[0053] One embodiment provides a multi-tube bundle resonant mass flow metering method for a gas-gas mixed phase, which can be implemented by the multi-tube bundle resonant mass flow metering device for a gas-gas mixed phase of the above embodiment, and specifically includes the following steps:

[0054] S1, the total mass flow rate Q of the gas-gas two-phase flow medium is measured by a multi-tube bundle resonant mass flow metering device for gas-gas mixed phase tm and the mixture density ρ mix It can be understood that the mixture density ρ mix=n·p; wherein n is the coefficient, p is the resonance frequency, and p is obtained by measuring the vibration frequency of the resonance tube by a multi-tube bundle resonance mass flow metering device for gas-gas mixed phase.

[0055] Specifically, the working gas density ρ can be obtained by calculation ag ,

[0056] ρ ag =f(ρ sg , P, T, Z) (1);

[0057] Among them, ρ ag - Operating gas density;

[0058] ρ sg -The density of the gas under standard conditions,

[0059] P - measured pressure,

[0060] T-medium temperature,

[0061] Z - gas compressibility factor.

[0062] The gas density ρ of the two-phase gas working condition was calculated respectively ag , such as the working gas density ρ of carbon dioxide and natural gas aco2 , ang .

[0063] Among them, the total mass flow rate and mixed density ρ of the two-phase flow medium measured by the multi-tube bundle resonant mass flow metering device for gas-gas mixed phase mix ,

[0064] ρ mix =F(p, P, T, Z) (2)

[0065] Among them, ρ mix - operating mixture density,

[0066] p-resonance frequency;

[0067] P - measured pressure;

[0068] T-medium temperature;

[0069] Z - gas compressibility factor.

[0070] S2. Calculate the mass flow of carbon dioxide and natural gas; the calculation formula is derived as follows:

[0071] The calculation formula for the total mass flow of the throttling type is:

[0072]

[0073] Among them, K-structure coefficient;

[0074] Q tm -Mass flow rate, unit is kg / s. Note the flow unit calculated using the standard flow formula!

[0075] C-outflow coefficient;

[0076] ε-expansion coefficient;

[0077] ΔP-Differential pressure value of the differential pressure sensor between the inlet and outlet of the throttling device, unit: Pa;

[0078] ρ mix - The working mixed density of the mixed medium in the throttle, unit: kg / m 3 .

[0079] At the working pressure P, the equivalent volume of natural gas and carbon dioxide is V ang and V aco2 ;

[0080] Total volume of working condition V at =V aco2 +V ang , the derivation formula is as follows:

[0081] Q tm =Q mco2 +Q mng =v aco2 * aco2 +v ang * ang (4)

[0082] ρ aco2 =f(ρ sco2 , P, T, Z), ρ ang =f(ρ sng , P, T, Z) (5)

[0083] Among them, ρ sco2 , sng are the densities of carbon dioxide and natural gas under standard conditions; ρ aco2 , ang is the density of carbon dioxide and natural gas under working conditions;

[0084] have:

[0085]

[0086] Among them, Q tm -Total mass flow, measured by a multi-tube resonant mass flow metering device for gas-gas mixing;

[0087] Q mco2 -Carbon dioxide gas mass flow rate, Q mng -Natural gas mass flow rate;

[0088] P-instrument pressure;

[0089] ρ mix - gas-gas mixture density, measured by a resonant tube;

[0090] ρ aco2 - Working condition carbon dioxide density, ρ aco2 =Q mco2 / V aco2 ;

[0091] ρ ang -Natural gas density at operating conditions, ρ ang =Q mng / V ang ;

[0092] v at - Total volume flow rate under working condition, v aco2 - Working condition carbon dioxide volume flow, v ang - natural gas volume flow rate under working conditions; v at =v aco2 +v ang .

[0093] From equations (3) to (6), we can get:

[0094]

[0095]

[0096] Q mco2 =Q tm *CMF (9)

[0097] Q mng =Q tm *(1-CMF) (10)

[0098] Among them, CVF-operating carbon dioxide volume content

[0099] CMF - carbon dioxide mass fraction.

[0100] In addition, regarding formula (6), another calculation method is to estimate the mass flow rate of carbon dioxide and natural gas based on the concept of mixed gas partial pressure.

[0101] Specifically:

[0102] P=P co2 +P ng

[0103] have:

[0104] ρ' co2 =f(ρ sco2, P co2 , T, Z), ρ' ng =f(ρ sng , P ng , T, Z)

[0105] Further:

[0106]

[0107]

[0108] Where, P-instrument pressure;

[0109] P co2 - partial pressure of carbon dioxide;

[0110] P ng - natural gas partial pressure;

[0111] ρ sco2 -density of carbon dioxide under standard conditions;

[0112] ρsng - Density of natural gas at standard conditions;

[0113] ρ aco2 -density under carbon dioxide conditions;

[0114] ρ ang -Density under natural gas conditions;

[0115] p-resonance frequency;

[0116] T-medium temperature;

[0117] Z-gas compressibility factor;

[0118] Q mco2 -CO2 gas mass flow rate;

[0119] Q mng -Natural gas mass flow rate.

[0120] In the above technical solution, the subscripts are explained as follows: m (mass) represents mass, v (volume) represents volume, mix (mixture) represents mixture, t (total) represents total (tm total mass, tv total volume), co2 represents carbon dioxide, and ng represents natural gas.

[0121] Through the above calculation method, the gas-gas mixed phase multi-tube bundle resonant mass flow metering device can accurately measure the mass flow of carbon dioxide and natural gas phases, and can adapt to different calibers and pressures.

[0122] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Multi-tube bundle resonant mass flow metering device for gas-gas mixed phase, include: Flow meter body; characterized in that it also includes a multi-parameter transmitter and a flow computer connected to the flow meter body; the inner cavity of the flow meter body is filled with antifreeze liquid, and a plurality of resonance tubes for drainage fluid are passed through the inner cavity; the resonance tubes are arranged along the length of the flow meter body, and a resonance excitation source for exciting the resonance tubes is fixedly connected to the resonance tubes; a measuring module is fixedly arranged in the inner cavity of the flow meter body.

2. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 1, It is characterized in that Resonance pipe joints are arranged at both ends of the flow meter body; and the ends of the resonance pipes are connected to the resonance pipe joints.

3. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 2, It is characterized in that The resonance pipe joint extends out of the end of the flow meter body and is connected to the flange.

4. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 2 or 3, It is characterized in that It also includes a pressure-taking tube; the first end of the pressure-taking tube is connected to the resonance tube joint, and the second end is connected to the multi-parameter transmitter.

5. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 1, It is characterized in that There are three resonance tubes.

6. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 1, It is characterized in that A pillow block is fixedly connected to the resonance tube.

7. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 6, It is characterized in that The pillow blocks are connected to the ends of the resonance tube, and the pillow blocks at both ends of the resonance tube are kept consistent.

8. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to claim 1, It is characterized in that The measuring module includes a temperature measuring module and / or a frequency sensor.

9. The multi-tube bundle resonant mass flow metering device for gas-gas mixed phase according to any one of claims 1 to 3 and 5 to 8, It is characterized in that The flow meter body is externally fixedly connected with a protective cover.

10. A method for measuring the mass flow of a gas-gas mixed phase using a multi-tube bundle resonant mass flow metering device for a gas-gas mixed phase according to any one of claims 1 to 9, It is characterized in that The following steps are involved: S1, the total mass flow rate Q of the gas-gas two-phase flow medium is measured by a multi-tube bundle resonant mass flow metering device for gas-gas mixed phase tm and the mixture density ρ mix ; S2. Calculate the carbon dioxide volume fraction CVF under working conditions. And calculate the carbon dioxide mass fraction CMF, S3. Calculate the carbon dioxide gas mass flow rate Q mco2 , Q mco2 =Q tm *CMF (9); And calculate the natural gas mass flow rate Q mng , Q mng =Q tm *(1-CMF) (10); Among them, ρ aco2 is the working carbon dioxide density; ρ ang is the operating natural gas density.

Images