CN111351541A - Gas-liquid two-phase flow measuring method based on interface wave and differential pressure flowmeter - Google Patents
Gas-liquid two-phase flow measuring method based on interface wave and differential pressure flowmeter Download PDFInfo
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- CN111351541A CN111351541A CN202010087976.2A CN202010087976A CN111351541A CN 111351541 A CN111351541 A CN 111351541A CN 202010087976 A CN202010087976 A CN 202010087976A CN 111351541 A CN111351541 A CN 111351541A
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Abstract
The invention relates to a gas-liquid two-phase flow measuring method based on the combination of interface waves and a differential pressure flowmeter, which mainly comprises the following steps: 1) acquiring fluctuation information and differential pressure fluctuation information of a gas-liquid interface to obtain average liquid film thickness delta and differential pressure dP; 2) respectively establishing average liquid film thickness delta and differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation between; 3) solving a simultaneous relational expression to obtain a gas phase apparent flow velocity usgLiquid phase apparent flow velocity usl(ii) a 4) By apparent flow velocity u of the gas phasesgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flow rate Ql. The invention can simultaneously and accurately measure the gas phase flow and the liquid phase flow, and the gas-liquid two-phase flow can be obtained by using the method of the invention only by simultaneously obtaining the fluctuation information of the gas-liquid interface and the differential pressure fluctuation information output by the differential pressure flowmeter, the method is simple and easy to realize, and higher flow measurement precision can be obtained under the same measurement condition。
Description
Technical Field
The invention relates to a gas-liquid two-phase flow measuring method based on the combination of interface waves and a differential pressure flowmeter.
Background
Petroleum as "industrial blood" has become a strategic material in the world today, and natural gas as a clean energy source is also gaining more and more attention from countries in the world. China is vast in breadth, land is large and living, the annual exploitation amount of petroleum and natural gas is very large, and high requirements are put forward on the oil gas energy measurement and management technology. The realization of the digital oil field is a new requirement for the oil field measurement and management technology in a new era, and how to accurately measure the flow of the petroleum and the natural gas by using the measuring equipment with low cost and convenient installation is very important.
The multiphase flow measurement technique can be classified into a separation type and a non-separation type according to whether or not the phase components are to be separated. At present, the traditional separation method is still used as a main measurement means in an oil field, the measurement precision is higher, but the defects of large volume and high price are also very obvious. After decades of development, although the non-separation type measurement method has been developed and an on-line flowmeter based on various measurement principles has been developed, the method is still in the laboratory stage at present because the multiphase flow itself is too complex and the multiphase flow theory is not yet mature. How to improve the measurement accuracy of the non-separation measurement method is an urgent problem to be solved in the research of the multiphase flow measurement technology.
Disclosure of Invention
The invention provides a gas-liquid two-phase flow measuring method based on the combination of interface waves and a differential pressure flowmeter, which solves the technical problem that the existing multiphase flow measuring method is difficult to simultaneously and accurately measure gas phase flow and liquid phase flow.
The technical scheme for solving the problems is as follows: a gas-liquid two-phase flow measuring method based on the combination of interfacial waves and a differential pressure flowmeter is characterized by comprising the following steps:
1) acquiring fluctuation information and differential pressure fluctuation information of a gas-liquid interface to obtain two characteristic parameters, wherein the two characteristic parameters are average liquid film thickness delta and differential pressure dP;
2) respectively establishing average liquid film thickness delta and differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation between;
3) solving a simultaneous relational expression to obtain a gas phase apparent flow velocity usgLiquid phase apparent flow velocity usl；
4) By apparent flow velocity u of the gas phasesgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flow rate Ql。
Further, in the step 1):
the fluctuation information of the gas-liquid interface is obtained by measuring the instantaneous fluctuation information of the gas-liquid interface through an interface wave measuring device. And acquiring differential pressure fluctuation information, which is instantaneous fluctuation information of the differential pressure measured by the differential pressure flowmeter.
Further, in the step 2):
average liquid film thickness delta and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation of (A) is as follows:
wherein D represents the inner diameter of the pipe, g represents the acceleration of gravity, aδ～fδThe model parameters need to be determined according to working conditions and flow patterns;
differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation of (A) is as follows:
wherein P is0Denotes the standard atmospheric pressure, ap～fpThe model parameters need to be determined according to the working conditions and the flow pattern.
Further, the simultaneous relational expression in the step 3) is solved to obtain the gas-phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe method specifically comprises the following steps:
3.1) simultaneous relationships (1) and (2):
3.2) solving by using an iterative algorithm:
3.21) empirically setting uslSearch range of [ u ]sl0,usl1]Let u stand forsl＝usl0；
3.22) iterating through the relation (1) to obtain usgConvergence value usg1；
3.23) iterating through the relation (2) to obtain usgConvergence value usg2；
3.24) selecting step length according to the measurement precision, and traversing u in the search rangesgRepeating the steps of 3.22) and 3.23), and calculating each usgCorresponding usg1And usg2；
3.25) finding usg1And usg2In all combinations of (1) such that | usg1-usg2The group with the smallest | is then taken as u by the average of the twosgThe set of corresponding uslAs uslAn estimate of (d).
Further, the above step 4) is carried out by a gas phase superficial flow velocity usgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flow rate QlThe method specifically comprises the following steps:
Qg＝Ausg(3)
Ql＝Ausl(4)
where a represents the cross-sectional area of the conduit.
Further, in the step 1): the instrument for measuring the instantaneous gas-liquid interface is an ultrasonic pulse transmitting and receiving instrument, and the differential pressure flowmeter is a Venturi tube.
The invention has the advantages that:
the invention provides a gas-liquid two-phase flow measuring method based on the combination of interface waves and a differential pressure flowmeter, which can simultaneously and accurately measure gas phase flow and liquid phase flow.
Drawings
FIG. 1 is a schematic diagram of a gas-liquid two-phase flow measurement method based on a combination of a boundary wave and a differential pressure flowmeter in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Referring to fig. 1, a gas-liquid two-phase flow measuring method based on the combination of interfacial waves and a differential pressure flowmeter comprises the following steps:
1) acquiring fluctuation information and differential pressure fluctuation information of a gas-liquid interface to obtain two characteristic parameters, wherein the two characteristic parameters are average liquid film thickness delta and differential pressure dP;
2) respectively establishing average liquid film thickness delta and differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation between;
3) solving a simultaneous relational expression to obtain a gas phase apparent flow velocity usgLiquid phase apparent flow velocity usl；
4) By apparent flow velocity u of the gas phasesgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flowQl。
Further, in the step 1):
the fluctuation information of the gas-liquid interface is obtained by measuring the instantaneous fluctuation information of the gas-liquid interface through an interface wave measuring device. Here, the interfacial wave measuring device may be any one of instruments for measuring an instantaneous gas-liquid interface, and the most commonly used is a conductance probe, a high-speed camera, an ultrasonic device, and the like, and preferably, is an ultrasonic pulse transmitting and receiving instrument manufactured by guangdong Shantou ultrasonic electronic corporation, and the product model is: CTS-8077 PR.
The differential pressure flowmeter can be any single-phase flowmeter for measuring the fluid flow based on a differential pressure signal, the most common single-phase flowmeter is a pore plate, a Venturi tube, an inner cone and the like, and the preferential single-phase flowmeter is a Venturi tube produced by the Kyowa Jetta petrochemical instrument limited company with the product model number of FTWP-0.6 × 300.
Further, in the step 2):
average liquid film thickness delta and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation of (A) is as follows:
wherein D represents the inner diameter of the pipe, g represents the acceleration of gravity, aδ～fδThe model parameters need to be determined according to working conditions and flow patterns;
differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation of (A) is as follows:
wherein P is0Denotes the standard atmospheric pressure, ap～fpThe model parameters need to be determined according to the working conditions and the flow pattern.
Further, the simultaneous relational expression in the step 3) is solved to obtain the gas phase apparent flowFast usgLiquid phase apparent flow velocity uslThe method specifically comprises the following steps:
3.1) simultaneous relationships (1) and (2):
3.2) solving by using an iterative algorithm:
3.21) empirically setting uslSearch range of [ u ]sl0,usl1]Let u stand forsl＝usl0；
3.22) iterating through the relation (1) to obtain usgConvergence value usg1；
3.23) iterating through the relation (2) to obtain usgConvergence value usg2；
3.24) selecting step length according to the measurement precision, and traversing u in the search rangeslRepeating the steps of 3.22) and 3.23), and calculating each uslCorresponding usg1And usg2；
3.25) finding usg1And usg2In all combinations of (1) such that | usg1-usg2The group with the smallest | is then taken as u by the average of the twosgThe set of corresponding uslAs uslAn estimate of (d).
Further, the above step 4) is carried out by a gas phase superficial flow velocity usgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flow rate QlThe method specifically comprises the following steps:
Qg＝Ausg(3)
Ql＝Ausl(4)
where a represents the cross-sectional area of the conduit.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent flow transformations made by using the contents of the specification and the drawings, or applied directly or indirectly to other related systems, are included in the scope of the present invention.
Claims (6)
1. A gas-liquid two-phase flow measuring method based on the combination of interfacial waves and a differential pressure flowmeter is characterized by comprising the following steps:
1) acquiring fluctuation information and differential pressure fluctuation information of a gas-liquid interface to obtain two characteristic parameters, wherein the two characteristic parameters are average liquid film thickness delta and differential pressure dP;
2) respectively establishing average liquid film thickness delta and differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation between;
3) solving a simultaneous relational expression to obtain a gas phase apparent flow velocity usgLiquid phase apparent flow velocity usl；
4) By apparent flow velocity u of the gas phasesgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flow rate Ql。
2. The method for measuring the flow of the gas-liquid two-phase flow based on the combination of the interfacial wave flow meter and the differential pressure flow meter according to claim 1, is characterized in that: in step 1):
acquiring fluctuation information of a gas-liquid interface, namely measuring instantaneous fluctuation information of the gas-liquid interface by an interface wave measuring instrument; and acquiring differential pressure fluctuation information, which is instantaneous fluctuation information of the differential pressure measured by the differential pressure flowmeter.
3. The method for measuring the flow of the gas-liquid two-phase flow based on the combination of the interfacial wave flow meter and the differential pressure flow meter according to claim 2, is characterized in that: in step 2):
average liquid film thickness delta and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation of (A) is as follows:
wherein D represents the inner diameter of the pipe, g represents the acceleration of gravity, aδ～fδIs a model parameterThe number is determined according to the working conditions and the flow pattern;
differential pressure dP and gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe relation of (A) is as follows:
wherein P is0Denotes the standard atmospheric pressure, ap～fpThe model parameters need to be determined according to the working conditions and the flow pattern.
4. The method for measuring the flow of the gas-liquid two-phase flow based on the combination of the interfacial wave flow meter and the differential pressure flow meter according to claim 3, is characterized in that: solving a simultaneous relational expression in the step 3) to obtain a gas phase apparent flow velocity usgLiquid phase apparent flow velocity uslThe method specifically comprises the following steps:
3.1) simultaneous relationships (1) and (2):
3.2) solving by using an iterative algorithm:
3.21) empirically setting uslSearch range of [ u ]sl0,usl1]Let u stand forsl＝usl0；
3.22) iterating through the relation (1) to obtain usgConvergence value usg1；
3.23) iterating through the relation (2) to obtain usgConvergence value usg2；
3.24) selecting step length according to the measurement precision, and traversing u in the search rangeslRepeating the steps of 3.22) and 3.23), and calculating each uslCorresponding usg1And usg2；
3.25) finding usg1And usg2In all combinations of (1) such that | usg1-usg2The group with the smallest | is then taken as u by the average of the twosgThe set of corresponding uslAs uslAn estimate of (d).
5. The method for measuring the flow of the gas-liquid two-phase flow based on the combination of the interfacial wave flow meter and the differential pressure flow meter as claimed in claim 4, wherein the method comprises the following steps: step 4) by means of the gas phase superficial velocity usgLiquid phase apparent flow velocity uslCalculating the volume flow Q of the gas phasegLiquid phase volume flow rate QlThe method specifically comprises the following steps:
Qg＝Ausg(3)
Ql＝Ausl(4)
where a represents the cross-sectional area of the conduit.
6. The method for measuring the flow of the gas-liquid two-phase flow based on the combination of the interfacial wave flow meter and the differential pressure flow meter according to claim 2, is characterized in that: in the step 1), the interface wave measuring instrument is specifically an ultrasonic pulse transmitting and receiving instrument, and the differential pressure flowmeter is specifically a venturi tube.
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| CN116539473A (en) * | 2023-03-17 | 2023-08-04 | 天津大学 | Method for measuring wet gas phase content by utilizing precession vortex MEMS triaxial acceleration vector module value information |
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| US20090229375A1 (en) * | 2008-03-14 | 2009-09-17 | Schlumberger Technology Corporation | Flow rate determination of a gas-liquid fluid mixture |
| CN109297554A (en) * | 2018-04-13 | 2019-02-01 | 东南大学 | Method for measuring T-type intraluminal fluid phase flow rate |
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