CN104515562A - Multiphase flow micro-differential pressure measuring device and flow metering method - Google Patents

Multiphase flow micro-differential pressure measuring device and flow metering method Download PDF

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Publication number
CN104515562A
CN104515562A CN201410808669.3A CN201410808669A CN104515562A CN 104515562 A CN104515562 A CN 104515562A CN 201410808669 A CN201410808669 A CN 201410808669A CN 104515562 A CN104515562 A CN 104515562A
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pressure
micro
straight pipeline
throttling
difference
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CN201410808669.3A
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檀朝銮
章路路
陈强
董凌
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ANHUI FIRSTCON INSTRUMENT Co Ltd
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ANHUI FIRSTCON INSTRUMENT Co Ltd
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Abstract

The invention discloses a multiphase flow micro-differential pressure measuring device which comprises a straight pipeline, a capacitive sensor, a density meter sensor, a multi-parameter micro-differential pressure transmitter, a throttling device, a temperature sensor, a remote data terminal and an upper computer, wherein the straight pipeline is used for multidirectional fluid circulation and comprises a first end and a second end which are oppositely arranged, the parallel electrode plate type capacitive sensor is mounted in the straight pipeline and close to the first end, the throttling device is mounted in the straight pipeline and close to the second end, the straight pipeline further comprises a throttling joint upstream pipeline, a uniform branch pipeline throttling joint and a throttling joint downstream straight pipeline which are positioned between the first end and the second end, the density meter sensor is mounted at the throttling joint upstream pipeline, the multi-parameter micro-differential pressure transmitter is mounted at the uniform branch pipeline throttling joint, and the temperature sensor is mounted at the throttling joint downstream straight pipeline.

Description

A kind of polyphasic flow micro-pressure-difference measurement mechanism and flow metering method
Technical field
The present invention relates to a kind of flow measurement technology, particularly relate to a kind of polyphasic flow micro-pressure-difference measurement mechanism and flow metering method.
Background technology
At present, domestic and international integrated oil company and associated mechanisms are all devoted to the investigation and application of multiphase flow metering method and apparatus.The commercialization measuring apparatus developed can be divided into following two large classes substantially:
One class carries out liquid phase separation in advance to Oil, Water, Gas polyphasic flow to be measured, and then measure respectively the gas phase after separation and liquid phase.This metering can reach certain precision, is used widely in oil field.Usually adopt gravitational separation process or cyclonic separation method because liquid phase is separated, cyclone separator arrangement is very huge, and cost is high, installation difficulty is large.Moreover measuring accuracy is directly subject to liquid phase separation efficiency and liquid phase measures the restriction effectively controlled respectively, continue to improve measuring accuracy has larger difficulty.
Another kind of is without the need to being separated in advance heterogeneous, and directly measures the parameter of polyphasic flow.Because parameter to be batched comprises liquid mass rate/volumetric flow rate and water percentage, and numerous parameter such as airshed and gas liquid ratio, often need, while employing orifice flowmeter, the metering method such as gamma rays, microwave also must be adopted to carry out independent measurement to comparing parameter.This method can on-line metering, and precision is higher, in the gauge check of petroleum industry, occupy suitable share, such as US Patent No. 6935,189B2.But because this metric results is directly by the flow pattern of polyphasic flow and the impact of fluidised form, metric results is not easily stablized, and measuring apparatus configuration and principle is very complicated, expensive, demarcates, I&M quite bothers.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of light and handy, precision is high, I&M polyphasic flow micro-pressure-difference measurement mechanism easily.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of polyphasic flow micro-pressure-difference measurement mechanism, it comprises: the straight pipeline circulated for multidirectional fluid, capacitive transducer, densitometer probe, multiparameter micro-pressure-difference transmitter, restriction device, temperature sensor, remote data terminal, and host computer, wherein said straight pipeline comprises first end and second end of contrary setting, described parallel plate electrode formula capacitive transducer is arranged in the straight pipeline of first end, described restriction device is arranged in the straight pipeline of the second end, described straight pipeline also comprises the throttling joint upstream line between first end and the second end, even branch pipe(tube) throttling, and throttling joint downstream straight pipeline, described densitometer probe is arranged on throttling joint upstream line place, described multiparameter micro-pressure-difference transmitter is arranged on throttling place of even branch pipe(tube), described temperature sensor is arranged on throttling joint straight pipeline place, downstream.
The present invention further improves as follows:
Further, the second end of described straight pipeline and remote data terminal pass through wired connection.
Further, described remote data terminal is connected by wireless GPRS with host computer.
Another technical matters to be solved by this invention is: the flow metering method providing a kind of above-mentioned polyphasic flow micro-pressure-difference measurement mechanism.
For solving the problems of the technologies described above, technical scheme of the present invention is: a kind of flow metering method of polyphasic flow micro-pressure-difference measurement mechanism, described polyphasic flow micro-pressure-difference measurement mechanism comprises: the straight pipeline circulated for multidirectional fluid, capacitive transducer, densitometer probe, multiparameter micro-pressure-difference transmitter, restriction device, temperature sensor, remote data terminal, and host computer, described straight pipeline comprises first end and second end of contrary setting, described parallel plate electrode formula capacitive transducer is arranged in the straight pipeline of first end, described restriction device is arranged in the straight pipeline of the second end, described straight pipeline also comprises the throttling joint upstream line between first end and the second end, even branch pipe(tube) throttling, and throttling joint downstream straight pipeline, described densitometer probe is arranged on throttling joint upstream line place, described multiparameter micro-pressure-difference transmitter is arranged on throttling place of even branch pipe(tube), described temperature sensor is arranged on throttling joint straight pipeline place, downstream, it is characterized in that, the flow metering method of described polyphasic flow micro-pressure-difference measurement mechanism comprises the steps:
(1) mixing permittivity, the mixed conductivity of test fluid, detection throttling differential pressure, the pressure of test fluid, the temperature of test fluid, the hybrid density of test fluid of described restriction device test fluid;
(2) by remote data terminal, these data wireless are sent to host computer, then calculate each phase ratio and flow by metering model in host computer.
Further, described multiparameter micro-pressure-difference transmitters sense pressure reduction, static pressure; Described densitometer probe detects hybrid density signal; Described temperature sensor detected temperatures signal; Described parallel plate electrode formula capacitive transducer Detection capacitance rate and conductivity signal; To detect chock pressure difference, static pressure, temperature, hybrid density, permittivity, conductivity signal are integrated in the circuit of one piece of table and focus on.
Further, described remote data terminal receives the signal of multiparameter micro-pressure-difference transmitters sense, passes to host computer by wireless, and host computer is for realizing calculating to data, display and storage.
Further, by the data separate computer technology of detection and data processing technique, carry out a large amount of mathematical computations and temperature and pressure compensation calculating.
Compared with prior art, the present invention has following beneficial effect: the flow metering method of this polyphasic flow micro-pressure-difference measurement mechanism is separated in advance without the need to liquid phase, the present invention designs and adopts multiparameter transmitters sense correlation parameter, by temperature and pressure compensation mode cleverly, namely the impact of parameter on transduction factor is solved, solve again the impact due to fluid Reynolds number change convection cell efflux coefficient and inflatable coefficient, thus avoid zero point drift, ensure that measuring accuracy; This polyphasic flow micro-pressure-difference measurement mechanism have compact conformation simply, linearly reproducible, measuring accuracy is high, easy to operate, be suitable for face width, be easy to the features such as popularization; The industries such as oil gas field, petrochemical complex, general chemical, metallurgy, wastewater treatment can be widely used in.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of polyphasic flow micro-pressure-difference of the present invention measurement mechanism.
Fig. 2 is the flow metering method workflow diagram of a kind of polyphasic flow micro-pressure-difference of the present invention measurement mechanism.
Wherein: 1. parallel plate electrode formula capacitive transducer, 2. densitometer probe, 3. multiparameter micro-pressure-difference transmitter, 4. restriction device, 5. temperature sensor, 6. remote data terminal, 7. host computer, 8. system software.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1 to Figure 2, for meeting a kind of polyphasic flow micro-pressure-difference measurement mechanism of the present invention and flow metering method structural representation.A kind of polyphasic flow micro-pressure-difference measurement mechanism, it comprises: the straight pipeline, parallel plate electrode formula capacitive transducer 1, densitometer probe 2, multiparameter micro-pressure-difference transmitter 3, restriction device 4, temperature sensor 5, remote data terminal 6 and the host computer 7 that circulate for multidirectional fluid.Described straight pipeline comprises first end (non-label) and second end (non-label) of contrary setting, described parallel plate electrode formula capacitive transducer 1 is arranged in the straight pipeline of first end, described restriction device 4 is arranged in the straight pipeline of the second end, and throttling joint upstream line, evenly branch pipe(tube) throttling and throttling that described straight pipeline also comprises between first end and the second end save downstream straight pipeline.Described densitometer probe 2 is arranged on throttling joint upstream line place, and described multiparameter micro-pressure-difference transmitter 3 is arranged on throttling place of even branch pipe(tube), and described temperature sensor 5 is arranged on throttling joint straight pipeline place, downstream.Second end of described straight pipeline and remote data terminal pass through wired connection.Described remote data terminal (RTU) 6 is connected by wireless GPRS with host computer 7.
The flow metering method of described polyphasic flow micro-pressure-difference measurement mechanism comprises the steps:
(1) mixing permittivity, the mixed conductivity of test fluid, detection throttling differential pressure, the pressure of test fluid, the temperature of test fluid, the hybrid density of test fluid of described restriction device 4 test fluid;
(2) by remote data terminal (RTU) 6, these data wireless are sent to host computer 7, then calculate each phase ratio and flow by metering model in host computer 7.Described multiparameter micro-pressure-difference transmitter 3 detects pressure reduction, static pressure; Described densitometer probe 2 detects hybrid density signal; Described temperature sensor 5 detected temperatures signal; Described parallel plate electrode formula capacitive transducer 1 Detection capacitance rate and conductivity signal; To detect chock pressure difference, static pressure, temperature, hybrid density, permittivity, conductivity signal are integrated in the circuit of one piece of table and focus on.Described remote data terminal (RTU) 6 receives the signal of multiparameter micro-pressure-difference transmitters sense, passes to host computer 7 by wireless, and host computer 7 is for realizing calculating to data, display and storage.By the data separate computer technology of detection and data processing technique, carry out a large amount of mathematical computations and temperature and pressure compensation calculating.
Parallel plate electrode formula capacitive transducer 1 and restriction device 4 are installed in straight pipeline, densitometer probe 2 is arranged on throttling joint upstream line place, multiparameter micro-pressure-difference transmitter 3 is arranged on throttling place of even branch pipe(tube), temperature sensor 5 is arranged on throttling joint straight pipeline place, downstream, launch in the set of signals detected in a table, and reach host computer 7 by remote data terminal (RTU) 6 by wireless, then by system software 8 analytical calculation process and display respectively compare data and each phase flow rate value.
Fig. 2 is a kind of polyphasic flow micro-pressure-difference measurement mechanism of the present invention and flow metering method workflow schematic diagram.The permittivity that parallel plate electrode formula capacitive transducer is detected and conductivity, the density p that densitometer probe detects, the pressure reduction △ P of multiparameter micro-pressure-difference transmitters sense, pressure P, the temperature T that temperature sensor detects, by remote data terminal in electrical control cubicles (RTU) by GPRS teletransmission to central control room upper computer, measure in host computer software systems by after analytical calculation and display respectively compare data and each phase flow rate value.
According to permittivity equation:
ε potpourri=α ε gas+ β ε water+ γ ε oil
In formula: ε potpourrifor potpourri permittivity, F/m (farad/rice); α is gas phase fraction; β is water phase fraction;
γ is oily phase fraction; ε gasfor gas phase permittivity; ε waterfor aqueous phase permittivity; For ε oiloil phase permittivity.
Conductivity equation:
σ potpourri=α σ gas+ β σ water+ γ σ oil
In formula: σ potpourrifor conductivity of mixture, S/m (Siemens/rice); σ gasfor gas phase conductivity; σ waterfor aqueous phase conductivity; σ oilfor oil phase conductivity.
Density equation:
ρ potpourri=α ρ gas+ β ρ water+ γ ρ oil
In formula: ρ potpourrifor mixture density, kg/m3 (kilograms per cubic meter); ρ gasfor density of gas phase; ρ waterfor aqueous phase densities; ρ oilfor oil phase density.
Normalizing equation:
α+β+γ=1
Wherein, ε oilfluid PVT parameter according to input is tried to achieve by flow computer, ε waterfor constant approximates 70F/m, ε gasfor constant approximates 1F/m; σ waterfluid PVT parameter according to input is tried to achieve by flow computer, σ oiland σ gasbe constant, numerical value is tending towards infinitely great; ρ potpourrican record with density sensor, ε potpourrican record with capacitive transducer, σ potpourrican record with conductivity sensor; α is the percent by volume that in the unit time, gas phase accounts in the mixture, β is the percent by volume that in the unit time, aqueous phase accounts in the mixture, γ is the percent by volume that in the unit time, oil phase accounts in the mixture, and α, β and γ are the known variables in equation.
When the low Water-cut Period capacitive transducer of potpourri works, permittivity equation, density equation and normalizing equation 3 each phase phase fractions of solving simultaneous equation oil gas water; During the work of potpourri high water-cut stage conductivity sensor, conductivity equation, density equation and normalizing equation 3 each phase phase fractions of solving simultaneous equation oil gas water.
Again according to polyphasic flow volume flow rate calculation formula:
Q = 86.4 η · C · ϵ 1 - β 4 π 4 d 2 2 ΔP ρ 1
In formula:
The volumetric flow rate of Q-fluid, [m3/d]; The volumetric flow rate of total fluid (under the operating mode);
The expansibility factor of ε-measured medium, for liquid ε=1; To gas, steam, dissolving wet goods compressible fluid ε <1,
&epsiv; = 1 - ( 0.351 + 0.256 &CenterDot; &beta; 4 + 0.93 &CenterDot; &beta; 8 ) &CenterDot; [ 1 - ( P 2 P 1 ) 1 / &kappa; ]
The equivalent opening diameter of differential pressure gauge under d-working condition, [mm];
△ P-throttling differential pressure, i.e. oil pressure-back pressure, △ P=P1-P2, [MPa];
ρ 1under-working condition, the density of upstream end fluid before throttling, [kg/m3];
C-efflux coefficient, dimensionless;
β-diameter ratio, dimensionless, β=d/D;
D-pipeline diameter, [mm];
The isentropic index of k-rock gas;
P 1the absolute static pressure of pressure port place, differential pressure gauge upstream compressible fluid under-operating mode;
η-online compensation coefficient
When accurately determining each phase ratio and the fluid total flow of polyphasic flow, thus obtain accurate liquid measure, oil mass, tolerance.
Multiparameter micro-pressure-difference transmitter provided by the invention is arranged on throttling place of even branch pipe(tube), can detect chock pressure difference, the static pressure of fluid, the temperature of fluid, hybrid density, permittivity, conductivity, is integrated in the circuit of one piece of table and focuses on.RTU will receive these signals detected, and data are reached pulpit host computer by the GPRS module carried by itself.Utilize computer technology and data processing technique, the calculating carrying out a large amount of each phase fractions counts with the flow that temperature and pressure compensation calculates polyphasic flow with comparing and is shown.The present invention compared with prior art advantage is: this metering method is separated in advance without the need to liquid phase, the present invention designs and adopts multiparameter transmitters sense correlation parameter, by temperature and pressure compensation mode cleverly, namely the impact of parameter on transduction factor is solved, solve again the impact due to fluid Reynolds number change convection cell efflux coefficient and inflatable coefficient, thus avoid zero point drift, ensure that measuring accuracy.This measuring apparatus have compact conformation simply, linearly reproducible, measuring accuracy is high, easy to operate, be suitable for face width, be easy to the features such as popularization.The industries such as oil gas field, petrochemical complex, general chemical, metallurgy, wastewater treatment can be widely used in.
The present invention is not limited to above-mentioned concrete embodiment, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, done all conversion, all drop within protection scope of the present invention.

Claims (7)

1. a polyphasic flow micro-pressure-difference measurement mechanism, it comprises: the straight pipeline circulated for multidirectional fluid, parallel plate electrode formula capacitive transducer, densitometer probe, multiparameter micro-pressure-difference transmitter, restriction device, temperature sensor, remote data terminal, and host computer, it is characterized in that: described straight pipeline comprises first end and second end of contrary setting, described parallel plate electrode formula capacitive transducer is arranged in the straight pipeline of first end, described restriction device is arranged in the straight pipeline of the second end, described straight pipeline also comprises the throttling joint upstream line between first end and the second end, even branch pipe(tube) throttling, and throttling joint downstream straight pipeline, described densitometer probe is arranged on throttling joint upstream line place, described multiparameter micro-pressure-difference transmitter is arranged on throttling place of even branch pipe(tube), described temperature sensor is arranged on throttling joint straight pipeline place, downstream.
2. polyphasic flow micro-pressure-difference measurement mechanism as claimed in claim 1, is characterized in that: the second end of described straight pipeline and remote data terminal pass through wired connection.
3. polyphasic flow micro-pressure-difference measurement mechanism as claimed in claim 1, is characterized in that: described remote data terminal is connected by wireless GPRS with host computer.
4. the flow metering method of a polyphasic flow micro-pressure-difference measurement mechanism, described polyphasic flow micro-pressure-difference measurement mechanism comprises: the straight pipeline circulated for multidirectional fluid, parallel plate electrode formula capacitive transducer, densitometer probe, multiparameter micro-pressure-difference transmitter, restriction device, temperature sensor, remote data terminal, and host computer, described straight pipeline comprises first end and second end of contrary setting, described parallel plate electrode formula capacitive transducer is arranged in the straight pipeline of first end, described restriction device is arranged in the straight pipeline of the second end, described straight pipeline also comprises the throttling joint upstream line between first end and the second end, even branch pipe(tube) throttling, and throttling joint downstream straight pipeline, described densitometer probe is arranged on throttling joint upstream line place, described multiparameter micro-pressure-difference transmitter is arranged on throttling place of even branch pipe(tube), described temperature sensor is arranged on throttling joint straight pipeline place, downstream, it is characterized in that, the flow metering method of described polyphasic flow micro-pressure-difference measurement mechanism comprises the steps:
(1) mixing permittivity, the mixed conductivity of test fluid, detection throttling differential pressure, the pressure of test fluid, the temperature of test fluid, the hybrid density of test fluid of described restriction device test fluid;
(2) by remote data terminal, these data wireless are sent to host computer, then calculate each phase ratio and flow by metering model in host computer.
5. the flow metering method of polyphasic flow micro-pressure-difference measurement mechanism as claimed in claim 4, is characterized in that: described multiparameter micro-pressure-difference transmitters sense pressure reduction, static pressure; Described densitometer probe detects hybrid density signal; Described temperature sensor detected temperatures signal; Described parallel plate electrode formula capacitive transducer Detection capacitance rate and conductivity signal; To detect chock pressure difference, static pressure, temperature, hybrid density, permittivity, conductivity signal are integrated in the circuit of one piece of table and focus on.
6. the flow metering method of polyphasic flow micro-pressure-difference measurement mechanism as claimed in claim 5, it is characterized in that: described remote data terminal receives the signal of multiparameter micro-pressure-difference transmitters sense, pass to host computer by wireless, host computer is for realizing calculating to data, display and storage.
7. the flow metering method of polyphasic flow micro-pressure-difference measurement mechanism as claimed in claim 6, is characterized in that: by the data separate computer technology of detection and data processing technique, carries out a large amount of mathematical computations and temperature and pressure compensation calculating.
CN201410808669.3A 2014-12-22 2014-12-22 Multiphase flow micro-differential pressure measuring device and flow metering method Pending CN104515562A (en)

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CN105091967A (en) * 2015-08-13 2015-11-25 辽宁聚焦科技有限公司 Method for measuring flow through pipeline or obstacle in pipeline
CN105806424A (en) * 2016-03-15 2016-07-27 成都中油翼龙科技有限责任公司 Multi-phase flow nondisjunction online measuring device and measuring method thereof
CN106352931A (en) * 2016-10-09 2017-01-25 无锡洋湃科技有限公司 Critical flow nozzle flowmeter for measuring each gas-liquid two-liquid two-phase flow in multiphase flow and measuring method
CN109945936B (en) * 2019-03-25 2020-06-09 中国电力工程顾问集团西北电力设计院有限公司 Water and steam flow calculation method based on throttling device measurement

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN105091967A (en) * 2015-08-13 2015-11-25 辽宁聚焦科技有限公司 Method for measuring flow through pipeline or obstacle in pipeline
CN105091967B (en) * 2015-08-13 2018-11-23 辽宁聚焦科技有限公司 A kind of flow-measuring method using barrier in pipeline itself or pipeline
CN105806424A (en) * 2016-03-15 2016-07-27 成都中油翼龙科技有限责任公司 Multi-phase flow nondisjunction online measuring device and measuring method thereof
CN105806424B (en) * 2016-03-15 2019-07-16 成都中油翼龙科技有限责任公司 A kind of multiphase flow does not separate on-line measurement device and its measurement method
CN106352931A (en) * 2016-10-09 2017-01-25 无锡洋湃科技有限公司 Critical flow nozzle flowmeter for measuring each gas-liquid two-liquid two-phase flow in multiphase flow and measuring method
CN106352931B (en) * 2016-10-09 2018-02-13 无锡洋湃科技有限公司 The critical flow nozzle flowmeter and measuring method of the respective flow of gas-liquid two-phase in a kind of measurement multiphase flow
WO2018064850A1 (en) * 2016-10-09 2018-04-12 无锡洋湃科技有限公司 Critical flow nozzle flowmeter for measuring respective flows of both gas and liquid phases in multiphase flow and measuring method
US10704937B2 (en) 2016-10-09 2020-07-07 Wuxi Sea Pioneers Technologies Co. Ltd Critical flow nozzle flowmeter for measuring respective flowrates of gas phase and liquid phase in multiphase fluid and measuring method thereof
CN109945936B (en) * 2019-03-25 2020-06-09 中国电力工程顾问集团西北电力设计院有限公司 Water and steam flow calculation method based on throttling device measurement

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