CN110411521A - A kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering method based on twin-jet nozzle - Google Patents
A kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering method based on twin-jet nozzle Download PDFInfo
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- CN110411521A CN110411521A CN201910576074.2A CN201910576074A CN110411521A CN 110411521 A CN110411521 A CN 110411521A CN 201910576074 A CN201910576074 A CN 201910576074A CN 110411521 A CN110411521 A CN 110411521A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; viscous liquids; paints; inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Oils, i.e. hydrocarbon liquids specific substances contained in the oil or fuel
Abstract
The invention belongs to Multiphase Fluid Measurement Technology field, especially a kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering method based on twin-jet nozzle, comprising the following steps: (1) acquire the instantaneous differential pressure value of two nozzles；(2) standard deviation of pressure difference signal fluctuation is calculated；(3) standard deviation is subjected to dimensionless processing；(4) it is fitted dimensionless group Z1With void fraction and Reynolds number correlation；(5) it is fitted dimensionless group Z2With the correlation of void fraction and Froude number；(6) simultaneous relational expression obtains the relational expression of void fraction and dimensionless group；(7) moisture content W is obtained by radio frequency water-containing machine；(8) calculating of total flow is carried out using multiphase flow phase-separation model；Metering method provided by the invention, by the way that Reynolds number and Froude number is added, it is contemplated that the influence of flowing, it is ensured that measuring accuracy.
Description
Technical field
The invention belongs to Multiphase Fluid Measurement Technology field, especially a kind of oil well Phase Volume Fraction for Multi-phase Flow based on twin-jet nozzle
On-line metering method.
Background technique
In original recovery process, to understand hydrocarbon stratum changes of contents, need to each component in produced liquid in oil well
Continuous metering is carried out containing rate and flow and real time measure data are provided.
Currently, crude oil measurement method includes human metering and on-line metering.Human metering is easy to operate, but there is sampling
The disadvantages of representative poor, poor continuity and time-consuming, it is not able to satisfy the needs of oil field production automation management；On-line metering can change
Kind oil field production automation level, realizes real time monitoring function, but current product exists poor for applicability mostly, and precision is low etc.
Problem.
Differential pressure type multiphase flow metering device structure is simple, high reliablity, technology maturation, at low cost and easy to maintain, more
Mutually flow work that can be relatively stable under each flow pattern.In multiphase flow field, domestic and international experts and scholars are calculated more using differential pressure principle
Phase flow point phase content has done many trials and effort.Murdock, James, Chisholm, Smith, Lin, Steven and
Steven and Hall etc. has carried out theoretical and experimental study to the measurement model of differential pressure flowmeter biphase gas and liquid flow, obtains
A series of semiempirical measurement model was obtained, has large increase for the metering of mixed traffic.But these empirical models are applicable in
Narrow range only has preferable effect in the respective scope of application.Especially for small flow, the operating condition of Gao Hanqi lacks adaptability.
Multiphase Fluid Measurement Technology is big more than the difficulty of single-phase flow, therefore, studies a kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering method
And system, so that it is met metering precisely, has a wide range of application and use cost is low, it will be a very necessary and significant work
Make.
Summary of the invention
For the problems of the prior art, the purpose of the present invention is to provide a kind of oil well Phase Volume Fraction for Multi-phase Flow to count online
Amount method, the metering method have the advantages that metering is accurate, have a wide range of application.
To achieve the goals above, the present invention is achieved by the following scheme:
A kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering method based on twin-jet nozzle, comprising the following steps:
(1) the instantaneous differential pressure value △ P of two nozzles is acquired1, △ P2；
(2) the standard deviation δ P of pressure difference signal fluctuation1、δP2, can indicate are as follows:
Wherein, n is differential pressure instantaneous value number of samples；
ΔPt1For the hourly value of differential pressure one, Δ Pi1Differential pressure value when for differential pressure a flash；
ΔPt2For the hourly value of differential pressure two, Δ Pi2For the instantaneous differential pressure value of differential pressure two；
(3) dimensionless group Z is defined1、Z2:
Z1=δ P1/ΔPt1 (3)
Z2=δ P2/ΔPt2 (4)
(4) it is fitted dimensionless group Z1With void fraction and Reynolds number correlation:
Z1=A μa1(Re/104)b1 (5)
Wherein, μ is that gaseous phase volume contains rate；
Re is liquid phase Reynolds number, when one timing Reynolds number of caliber is only the monotropic function of flow；
Wherein, ρlFor density of liquid phase, qlFor liquid phase flow, μaFor viscosity, d1For the internal diameter of nozzle one；
(5) it is fitted dimensionless group Z2With the correlation of void fraction and Froude number:
Wherein, ρlDensity of liquid phase, qlFor liquid phase flow, d2For the internal diameter of nozzle two, ρgFor density of gas phase, g is gravity speed
Degree；
It carries out returning determining coefficient A, B, a by experimental data1、b1、a2、b2；
(6) relational expression (5), (7) are multiplied, following relational expression (9) can be obtained after arrangement, in a1、b1、a2、b2Known situation
Under, solving gas volume fraction μ needs to iteratively solve:
(7) moisture content W is obtained by radio frequency water-containing machine measurement；
(8) calculating of total flow is carried out using multiphase flow phase-separation model:
Wherein: Q is the mass flow of fluid, units/kg/s；
C is efflux coefficient, dimensionless；
ε is the expansibility factor of measured medium, is equal to 1 for liquid ε, to compressible flows such as gas, steam, dissolved oils
Body ε is less than 1, dimensionless；
A is area of passage, be can be obtained by d；
D is the equivalent opening diameter of throttling element under working condition, unit m；
Δ P is throttling differential pressure, unit Pa；
β is diameter ratio, and dimensionless, β=d/D, D are pipeline diameter, unit m；
ρlFor the density for the preceding upstream end liquid that under working condition, throttles, units/kg/m3；
ρgFor the density for the preceding upstream end gas that under working condition, throttles, units/kg/m3；
X is mass gas content rate, the result that a, b are come out by fitting experimental data；
(9) from x is calculated by gas volume fraction μ:
(10) oil gas water three phase separate phase flow rate are as follows:
Ql=Qa×x；
Qo=Qa×(1-x)×(1-W)；
Qw=Qa×(1-x)×W；
Wherein, Q is total mass flow rate, and x is mass gas content rate, QlFor liquid phase flow, QoFor oily phase flow rate, W is moisture content,
QwFor water phase flow；
(11) differential pressure generated to two nozzles solves flow respectively, calculates average value as flow and exports result.
Compared with prior art, the present invention has following technical effect that
1, the oil well Phase Volume Fraction for Multi-phase Flow on-line metering method provided by the invention based on twin-jet nozzle, without separating dress
It sets, the apparatus structure for on-line measurement is simple, and occupied area is small, easy for installation；In specific metering process, biography has been abandoned
The gamma ray method of system calculates void fraction, reduces ray and endangers to environment bring；
2, in on-line metering method provided by the invention, by the pass of fitting Differential Pressure Fluctuation signal of Gas characteristic value and void fraction
When being formula, Reynolds number and Froude number is added, it is contemplated that the influence of flowing improves the precision of fitting.
Detailed description of the invention
Fig. 1 is the method schematic diagram of on-line metering oil well Phase Volume Fraction for Multi-phase Flow provided by the invention；
Figure label explanation: 1- temperature and pressure integrated transducer, 2- the first high-precision difference gauge, 3- the second high-precision differential pressure
Meter, 4- radio frequency water-containing machine, 5- first jet throttling element, 6- second nozzle throttling element.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific attached drawing is closed, the present invention is furture elucidated.
It is as shown in connection with fig. 1 a kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering side based on twin-jet nozzle provided by the invention
The schematic diagram of method, such as sequentially connected first jet throttling element 5 and second nozzle throttling element 6, and be arranged in first jet section
The the first high-precision difference gauge 2 for flowing 5 both ends of part, is arranged in the second high-precision difference gauge 3 at 6 both ends of second nozzle throttling element；
One end of second nozzle throttling element 6 is provided with temperature and pressure integrated transducer 1 in first jet throttling element 5；
One end of first jet throttling element 5 is provided with radio frequency water-containing machine 4 in second nozzle throttling element 6.
The internal diameter of two nozzle throttling elements is different, wherein the internal diameter of first jet throttling element 5 is d1, second nozzle throttling
The internal diameter of part 6 is d2；
Phase Volume Fraction for Multi-phase Flow on-line metering method the following steps are included:
(1) the instantaneous differential pressure value △ P of two nozzles is acquired1, △ P2, the instantaneous differential pressure value △ P1, △ P2It is respectively first
Transient data read-out by high-precision difference gauge 2, the second high-precision difference gauge 3；
(2) standard deviation for the pressure difference that first jet throttling element 5 and second nozzle throttling element 6 generate, i.e. pressure difference are calculated separately
The standard deviation δ P of signal fluctuation1、δP2, can indicate are as follows:
Wherein, n is differential pressure instantaneous value number of samples；
ΔPt1For the hourly value of differential pressure one, Δ Pi1Differential pressure value when for differential pressure a flash；
ΔPt2For the hourly value of differential pressure two, Δ Pi2For the instantaneous differential pressure value of differential pressure two；
(3) standard deviation is subjected to dimensionless processing, that is, defines dimensionless group Z1、Z2:
Z1=δ P1/ΔPt1 (3)
Z2=δ P2/ΔPt2 (4)
(4) it is fitted dimensionless group Z1With void fraction and Reynolds number correlation:
Z1=A μa1(Re/104)b1 (5)
Wherein, μ is that gaseous phase volume contains rate；
Re is liquid phase Reynolds number, when one timing Reynolds number of caliber is only the monotropic function of flow；
Wherein, ρlFor density of liquid phase, qlFor liquid phase flow, μaFor viscosity, d1For the internal diameter of first jet throttling element 5；
(5) it is fitted dimensionless group Z2With the correlation of void fraction and Froude number:
Wherein, ρlDensity of liquid phase, qlFor liquid phase flow, d2For the internal diameter of second nozzle throttling element 6, ρgFor density of gas phase, g
For gravity speed；
It carries out returning determining coefficient A, B, a by experimental data1、b1、a2、b2；
(6) relational expression (5), (7) are multiplied, following relational expression (9) can be obtained after arrangement, in a1、b1、a2、b2Known situation
Under, solving gas volume fraction μ needs to iteratively solve:
(7) moisture content W is obtained by radio frequency water-containing machine measurement；
(8) calculating (Bizon model) of total flow is carried out using multiphase flow phase-separation model:
Wherein: Q is the mass flow of fluid, units/kg/s；
C is efflux coefficient, dimensionless；
ε is the expansibility factor of measured medium, is equal to 1 for liquid ε, to compressible flows such as gas, steam, dissolved oils
Body ε is less than 1, dimensionless；
A is area of passage, be can be obtained by d；
D is the equivalent opening diameter of throttling element under working condition, unit m；
Δ P is throttling differential pressure, unit Pa；
β is diameter ratio, and dimensionless, β=d/D, D are pipeline diameter, unit m；
ρlFor the density for the preceding upstream end liquid that under working condition, throttles, units/kg/m3；
ρgFor the density for the preceding upstream end gas that under working condition, throttles, units/kg/m3；
X is mass gas content rate, the result that a, b are come out by fitting experimental data；
(9) from x is calculated by gas volume fraction μ:
(10) oil gas water three phase separate phase flow rate are as follows:
Ql=Qa×x；
Qo=Qa×(1-x)×(1-W)；
Qw=Qa×(1-x)×W；
Wherein, Q is total mass flow rate, and x is mass gas content rate, QlFor liquid phase flow, QoFor oily phase flow rate, W is moisture content,
QwFor water phase flow；
(11) differential pressure generated to two nozzles solves flow respectively, calculates average value as flow and exports result.
Oil well Phase Volume Fraction for Multi-phase Flow on-line metering method provided by the invention, by installing two side by side in equipment pipe
A nozzle is utilized respectively two difference gauges to measure the pressure difference △ P generated when fluid flows through the nozzle of two different Throttling ratios1,
△P2, then calculate the standard deviation δ P that two nozzle throttling elements generate pressure difference1、δP2, standard deviation is further subjected to dimensionless processing,
Then it is fitted the correlation of itself and void fraction, Reynolds number respectively, is fitted the correlation of itself and void fraction, Froude number, simultaneous obtains
To the relational expression of void fraction and dimensionless group, moisture content W is measured by radio frequency water-containing machine, followed by multiphase flow phase-separation model
Carry out the calculating of total flow；The metering method, joined Reynolds number and Froude number in mathematical model, adequately consider stream
Dynamic influence, it is ensured that measuring accuracy.
Basic principles and main features and the features of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (1)
1. a kind of oil well Phase Volume Fraction for Multi-phase Flow on-line metering method based on twin-jet nozzle, which comprises the following steps:
(1) the instantaneous differential pressure value △ P of two nozzles is acquired1, △ P2；
(2) the standard deviation δ P of pressure difference signal fluctuation1、δP2, can indicate are as follows:
Wherein, n is differential pressure instantaneous value number of samples；
ΔPt1For the hourly value of differential pressure one, Δ Pi1Differential pressure value when for differential pressure a flash；
ΔPt2For the hourly value of differential pressure two, Δ Pi2For the instantaneous differential pressure value of differential pressure two；
(3) dimensionless group Z is defined1、Z2:
Z1=δ P1/ΔPt1 (3)
Z2=δ P2/ΔPt2 (4)
(4) it is fitted dimensionless group Z1With void fraction and Reynolds number correlation:
Z1=A μa1(Re/104)b1 (5)
Wherein, μ is that gaseous phase volume contains rate；
Re is liquid phase Reynolds number, when one timing Reynolds number of caliber is only the monotropic function of flow；
Wherein, ρlFor density of liquid phase, qlFor liquid phase flow, μaFor viscosity, d1For the internal diameter of nozzle one；
(5) it is fitted dimensionless group Z2With the correlation of void fraction and Froude number:
Z2=B μa2Frl b2 (7)
Wherein, ρlDensity of liquid phase, qlFor liquid phase flow, d2For the internal diameter of nozzle two, ρgFor density of gas phase, g is gravity speed；
It carries out returning determining coefficient A, B, a by experimental data1、b1、a2、b2；
(6) relational expression (5), (7) are multiplied, following relational expression (9) can be obtained after arrangement, in a1、b1、a2、b2In known situation, ask
Solution gas volume fraction μ needs to iteratively solve:
(7) moisture content W is obtained by radio frequency water-containing machine measurement；
(8) calculating of total flow is carried out using multiphase flow phase-separation model:
Wherein: Q is the mass flow of fluid, units/kg/s；
C is efflux coefficient, dimensionless；
ε is the expansibility factor of measured medium, is equal to 1 for liquid ε, to the compressible fluids such as gas, steam, dissolved oil ε
Less than 1, dimensionless；
A is area of passage, be can be obtained by d；
D is the equivalent opening diameter of throttling element under working condition, unit m；
Δ P is throttling differential pressure, unit Pa；
β is diameter ratio, and dimensionless, β=d/D, D are pipeline diameter, unit m；
ρlFor the density for the preceding upstream end liquid that under working condition, throttles, units/kg/m3；
ρgFor the density for the preceding upstream end gas that under working condition, throttles, units/kg/m3；
X is mass gas content rate, the result that a, b are come out by fitting experimental data；
(9) from x is calculated by gas volume fraction μ:
(10) oil gas water three phase separate phase flow rate are as follows:
Ql=Qa×x；
Qo=Qa×(1-x)×(1-W)；
Qw=Qa×(1-x)×W；
Wherein, Q is total mass flow rate, and x is mass gas content rate, QlFor liquid phase flow, QoFor oily phase flow rate, W is moisture content, QwFor
Water phase flow；
(11) differential pressure generated to two nozzles solves flow respectively, calculates average value as flow and exports result.
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