CN204373715U - A kind of polyphasic flow micro-pressure-difference measurement mechanism - Google Patents

Abstract

The utility model discloses 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.

Description

A kind of polyphasic flow micro-pressure-difference measurement mechanism

Technical field

The utility model relates to a kind of flow measurement technology, particularly relates to a kind of polyphasic flow micro-pressure-difference measurement mechanism.

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.

Utility model content

Technical problem to be solved in the utility model 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, the technical solution of the utility model 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 utility model 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.

Compared with prior art, the utility model 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 utility model design 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 utility model measurement mechanism.

Fig. 2 is the flow metering method workflow diagram of a kind of polyphasic flow micro-pressure-difference of the utility model 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 utility model is further illustrated.

As shown in Figure 1 to Figure 2, for meeting a kind of polyphasic flow micro-pressure-difference measurement mechanism of the utility model 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 utility model 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:

$Q=86.4\frac{\mathrm{\η}\·C\·\mathrm{\ϵ}}{\sqrt{1-{\mathrm{\β}}^4}}\frac{\mathrm{\π}}{4}{d}^2\sqrt{\frac{2\mathrm{\ΔP}}{{\mathrm{\ρ}}_1}}$

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,

$\mathrm{\&epsiv;}=1-(0.351+0.256\&CenterDot;{\mathrm{\&beta;}}^4+0.93\&CenterDot;{\mathrm{\&beta;}}^8)\&CenterDot;[1-{\left(\frac{P_2}{P_1}\right)}^{1/\mathrm{\&kappa;}}]$

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.

The multiparameter micro-pressure-difference transmitter that the utility model provides 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 utility model compared with prior art advantage is: this metering method is separated in advance without the need to liquid phase, the utility model design 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 utility model 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 domain of the present utility model.

Claims (3)

1. A multiphase flow micro-pressure differential measuring device, comprising: straight pipes for multi-directional fluid flow, parallel plate-type capacitive sensors, densitometer sensors, multi-parameter micro-pressure differential transmitters, throttling devices, temperature The sensor, the remote data terminal, and the host computer are characterized in that: the straight pipe includes a first end and a second end oppositely arranged, and the parallel plate capacitive sensor is installed in the straight pipe near the first end. The throttling device is installed in the straight pipe adjacent to the second end, and the straight pipe also includes an upstream pipe of the throttling joint, a throttling of the uniform branch pipe, and a straight pipe downstream of the throttling joint between the first end and the second end, The density meter sensor is installed at the upstream pipeline of the throttling joint, the multi-parameter micro-pressure differential transmitter is installed at the throttle of the uniform branch pipeline, and the temperature sensor is installed at the downstream straight pipeline of the throttling joint. 2. The multiphase flow micro-pressure differential measuring device according to claim 1, characterized in that: the second end of the straight pipe is connected to a remote data terminal through a cable. 3. The device for measuring the micro-pressure difference of multiphase flow according to claim 1, characterized in that: the remote data terminal is connected to the host computer through wireless GPRS.