CN207990210U - Underground natural gas storage individual well note adopts same pipe bidirectional measuring device - Google Patents
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- CN207990210U CN207990210U CN201721221685.8U CN201721221685U CN207990210U CN 207990210 U CN207990210 U CN 207990210U CN 201721221685 U CN201721221685 U CN 201721221685U CN 207990210 U CN207990210 U CN 207990210U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 58
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 18
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- 239000007924 injection Substances 0.000 claims description 13
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Abstract
The utility model discloses a kind of underground natural gas storage individual well notes to adopt same pipe bidirectional measuring device.The device includes that sequentially connected first temperature and pressure measure straight tube, throttle valve and the second temperature and pressure and measure straight tube, one end that first temperature and pressure measure straight tube is communicated in gas storage, the other end is communicated in throttle valve, and gas storage is stretched out in one end that the second temperature and pressure measure straight tube, and the other end is communicated in throttle valve；Pressure sensor, pressure sensor, which is separately positioned on, adopts that the first temperature and pressure measure straight tube and the second temperature and pressure measure on straight tube；Temperature sensor, temperature sensor are separately positioned on that the first temperature and pressure measure straight tube and the second temperature and pressure measure on straight tube；Processing unit is measured, metering processing unit is communicatively coupled to throttle valve, pressure sensor and temperature sensor, for calculating gas flow.The apparatus structure of the utility model is simple, and working range is broad and performance is stablized, and is not interfered by factors such as fluidised form, phase, condensed liquid, solid impurities.
Description
Technical field
The utility model belongs to underground natural gas storage well head note and adopts bidirectional measuring technical field field, more specifically,
It is related to a kind of device measured using throttle valve Throttle Principle, is mainly used for underground natural gas storage in gas injection and gas production
In the process, real-time, online, continuous, gas-liquid split-phase the bidirectional measuring function of realizing individual well, belongs to a kind of Internal Gauge utensil.
Background technology
Underground natural gas storage (referred to as " gas storage ") is to ensure that the optimal selection to natural gas user tight gas supply, tool
Have the advantages that storage capacity is big, safe, service life is long, economy and facility, is a kind of natural gas more generally used at present
Storage facility.The metering the injected gas data of each individual well and gas production continuous data are to evaluate the regional stratum day in the well group of gas storage ground
The important evidence of right gas storage capacity and extraction ability.Gas storage note adopts individual well requirement bidirectional measuring, carrying high-low pressure alternately becomes
Change, and higher measuring accuracy is still can guarantee under the conditions of note gas production ingredient, pressure, flow, phase, change of flow state are larger
And the features such as reliability, more harsh requirement is proposed to measuring instrument, therefore select and be suitble to gas storage operating condition feature
Metering device it is most important.
Gas storage well head note adopts bidirectional measuring and mostly uses target type meter and ultrasonic flowmeter at present.Target type meter according to
Bernoulli equation because the kinetic energy of its own and target plate generate pressure difference, and is generated to target plate when medium flows in measurement pipe
Active force makes target plate generate micro displacement, the size of active force and velocity of medium it is square directly proportional.In this way, sensor
The signal of acquisition can be scaled the flow of fluid.Target type meter is simple in structure, does not slide, rotates movable member, main to use
In the fluid for measuring high viscosity, low reynolds number.When target type meter is used for gas storage well head bidirectional measuring, since target plate is installed
It in pipeline, needs and air flow contacts, in noting gas production process, the mushy stages such as solid particle, oil, water impurity forms target plate and hands over
Varying load is easy to be influenced by complex working conditions such as air-flow velocity, air-flow erosion, impurity interference, Produced Liquid fluctuations, metering is caused to miss
Difference is bigger than normal.
Ultrasonic flowmeter mainly measures rate-of flow by signal transmission TEC time error correction principle, energy converter in adverse current and
Downbeam emits and receives signal simultaneously, and when media flow, signal is propagated in the medium can follow flowing to generate displacement,
The time of propagation is less than countercurrent direction in downbeam, and the speed direct proportionality of this time difference and average medium flowing,
It is poor by measuring this time, you can to calculate rate-of flow.When ultrasonic transducer is in direct contact with gas, referred to as plug-in type is ultrasonic
Flowmeter；When ultrasonic transducer is not in direct contact with gas, referred to as external clamping ultrasonic flowmeter.Ultrasonic flowmeter, which has, to be measured
Precision is high, highly reliable, unperturbed dynamic component, the features such as pressure loss is small, be particularly suitable for the high-precision of Large Diameter Pipeline gas flow
It measures (caliber is up to 1.6m, precision 0.5%), but in the actual application of gas storage, impurity and drop in natural gas,
The factors such as energy converter position error, acoustic noise interference can cause error to measurement result.According to《It is surveyed with gas ultrasonic flowmeter
Measure gas discharge (GB/T 18604-2014)》National standard, under normal gas transmission operating condition, in flowmeter body
Attachment (such as condensed liquid or with processing impurity oil product residue, ash and sand) can reduce flowmeter circulation area and
The accuracy of measuring is influenced, while attachment can also hinder or decay ultrasonic transducer to emit and receive ultrasonic signal, or influenced
Ultrasonic signal therefore should inspect periodically cleaning in the reflection of flowmeter body inner wall to flowmeter.
The property of the above target type meter and ultrasonic flowmeter (containing plug-type ultrasonic flowmeter and external clamping ultrasonic flowmeter)
It can compare and be shown in Table 1.From the point of view of field application situation, the metering difficulty of gas injection section is little, and the problem is less；At the beginning of gas production
Phase carries oil or condensation water flooding and landwaste impurity etc. in natural gas gas, influences the measurement accuracy of flowmeter, be easy to make
Easily lead to flowmeter choked flow piece card resistance when flowmeter carrying static pressure difference is larger at tolerance measurement error, damage or fall off.
In addition, target type meter and ultrasonic flowmeter cannot measure the condensed liquid or water flooding of injection-production well.
1 gas storage type double flow meter contrast table of table
Utility model content
In view of the above-mentioned problems, the purpose of this utility model provides a kind of metering device with automatic data collection function,
It creates conditions to build digitlization gas storage.Realize in complicated air-flow environment individual well note adopt same pipe it is two-way, real-time, online,
Continuously, gas-liquid split-phase is measured, and can not only meet precision and reliability requirement of the gas storage about Internal Gauge, but also can be greatly lowered
Measuring cost.
To achieve the above object, a kind of underground natural gas storage individual well note of the utility model offer adopts same pipe bidirectional measuring
Device, described device include：
Sequentially connected first temperature and pressure measure straight tube, throttle valve and the second temperature and pressure and measure straight tube, and first temperature and pressure measure
One end of straight tube is communicated in the gas storage, and the other end is communicated in the throttle valve, and second temperature and pressure measure one end of straight tube
The gas storage is stretched out, the other end is communicated in the throttle valve；
Pressure sensor, the pressure sensor are separately positioned on that first temperature and pressure measure straight tube and the second temperature and pressure measure
On straight tube；
Temperature sensor, the temperature sensor are separately positioned on that first temperature and pressure measure straight tube and the second temperature and pressure measure
On straight tube；
Processing unit is measured, the metering processing unit is communicatively coupled to the throttle valve, the pressure sensor and institute
Temperature sensor is stated, for calculating gas flow.
Further, first temperature and pressure measure straight tube and the second temperature and pressure measure straight tube and are vertically arranged, and the throttle valve is set
It sets around the corner.
Further, further include demarcating connector straight tube, the calibration connector straight tube is connected to second temperature and pressure and measures directly
One end of pipe.
Further, it is dismountable installation that calibration connector straight tube measures straight tube with second temperature and pressure.
Further, first temperature and pressure measure straight tube, the throttle valve, second temperature and pressure and measure straight tube, the mark
Determine connector straight tube and pass sequentially through flange to be tightly formed by connecting.
Further, the metering processing unit is remote computer workstations or microcontroller.
Further, one end that first temperature and pressure measure straight tube is communicated in gas storage and goes out as gas production entrance and gas injection
Mouthful, gas storage is stretched out as gas injection entrance and gas production outlet in one end that second temperature and pressure measure straight tube.
Further, the throttle valve is provided with jaw opening sensor.
The apparatus structure of the utility model is simple, and working range is broad and performance is stablized, not by fluidised form, phase, condensed liquid,
The interference of the factors such as solid impurity.Provided with calibration connector, it is convenient to using mobile metering device under conditions of not stopping production
On-line debugging and periodic calibrating are carried out to the present apparatus, can also use downstream production separator during start and stop well to the present apparatus into
Row calibration.
Moreover, the multiple wells that the device of the utility model can be gas storage (group) simultaneously work respectively, further reduced
Measuring cost improves operation management efficiency.
Other features and advantages of the utility model will be described in detail in subsequent specific embodiment part.
Description of the drawings
The utility model illustrative embodiments are described in more detail in conjunction with the accompanying drawings, the utility model it is upper
It states and other purposes, feature and advantage will be apparent, wherein in the utility model illustrative embodiments, phase
Same reference label typically represents same parts.
Fig. 1 shows the metering device structural schematic diagram of the utility model.
Fig. 2 shows the metering method flow charts of one embodiment according to the present utility model.
Fig. 3 shows the throttling process schematic diagram of one embodiment according to the present utility model.
Reference sign：
1, the first temperature and pressure measure straight tube；2, throttle valve；3, the second temperature and pressure measure straight tube；4, connector straight tube is demarcated；5, it measures
Processing unit；D, pipeline interior diameter；P1、P2, measure point pressure；T1、 T2, measure a temperature；CD, throttle valve opening；Qg、Ql, gas
The flow of phase, liquid phase.
Specific implementation mode
Preferred embodiments of the present invention are described in more detail below.Although the following describe the utility model
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the utility model without the implementation that should be illustrated here
Mode is limited.On the contrary, these embodiments are provided so that the utility model is more thorough and complete, and can be by this
The range of utility model is completely communicated to those skilled in the art.
The utility model is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of underground natural gas storage individual well note provided by the utility model adopts same pipe bidirectional measuring dress
It sets, including the first temperature and pressure measure straight tube 1, throttle valve 2 (for example, angie type needle-valve, cage sleeving valve etc.), the second temperature and pressure and measure straight tube 3, mark
Determine connector straight tube 4, metering processing unit 5 (for example, remote computer workstations or microcontroller etc. in equipment), and meter
Amount processing unit 5 is equipped with meter application.
First temperature and pressure measure that straight tube 1, throttle valve 2, the second temperature and pressure measure straight tube 3, calibration connector straight tube 4 passes sequentially through flange
Tightly it is formed by connecting.Demarcate the hose coupling of connection mobile metering device (such as vehicle-mounted cyclonic separation metering sled) of connector straight tube 4.
Pressure sensor is separately positioned on that the first temperature and pressure measure straight tube 1 and the second temperature and pressure measure on straight tube 3, P1And P2Respectively
Straight tube 1 is measured for the first temperature and pressure and the second temperature and pressure measure the pressure value of pressure sensor on straight tube 3.Temperature sensor is respectively set
Straight tube 1 is measured in the first temperature and pressure and the second temperature and pressure measure on straight tube 3, T1And T2Respectively the first temperature and pressure measure straight tube 1 and second
Temperature and pressure measure the temperature value of temperature sensor on straight tube 3.One end that first temperature and pressure measure straight tube 1 is communicated in gas storage as gas production
Entrance (gas injection outlet), the other end are communicated in throttle valve 2, and gas storage is stretched out as gas injection in one end that the second temperature and pressure measure straight tube 3
Entrance (gas production outlet), the other end is communicated in throttle valve 2.Throttle valve 2 is provided with jaw opening sensor.
Metering processing unit 5 is communicatively coupled to temperature/pressure sensor, throttle valve opening sensor and state of keeping in communication, and passes through
The meter application of metering processing unit 5 is calculated in real time completes metering tasks.The device of the utility model can automatic identification simultaneously
Complete one-well metering function of the gas storage under the conditions of gas injection, gas production stage, natural gas difference flow direction, flow, fluidised form, phase.
By measuring the acquisition of 5 real-time online of processing unit, the first temperature and pressure measure straight tube 1, the second temperature and pressure measure straight tube 3 and section
The data of the jaw opening sensor of valve 2 are flowed, meter application is imported and calculates completion online.
Another embodiment according to the present utility model, provide a kind of underground natural gas storage individual well note adopt it is two-way with managing
Metering method, the method includes：
Acquire pressure, temperature and throttle valve opening data；
According to gas component and the average value of the temperature of acquisition, pressure data, it is mixed to calculate natural gas under conditions present
Close the gas phase mass fraction, liquid phase quality score, moisture content transitivity parameter of object；
Differentiate current work flow；
If being currently gas production work flow, the gas phase flow rate and liquid phase flow of individual well are calculated；
If being currently gas injection work flow, the gas flow of individual well is calculated.
Next, describing specific embodiment of the utility model with reference to Fig. 2.With reference to Fig. 2, the implementing procedure of metering method is such as
Under：
(1) component (CH of natural gas is inputted4、C2H6、C3H8、C4H10、H2O etc.) and its molar fraction, and periodically supervised
It surveys.This step is not that each metering is required for input, if fruit component varies widely, is timely updated.
(2) real time datas such as pressure, temperature and the throttle valve opening before and after well head throttle valve are acquired.For example, can be based on
OPC communications protocol acquires real time data by SCADA/DCS control systems.
(3) average value of the temperature, pressure data acquired according to gas component and in real time, utilizes the thermodynamics that balances each other
Computation model calculates under conditions present, the gas, liquid mass fraction of natural gas mixture, moisture content transitivity parameter etc..Physical property
Parameter includes density, molal weight, than parameters such as volume, specific enthalpy, specific entropy, specific heat, specific internal energy, compressibility factor, JT coefficients.It is equal
Weighing apparatus Thermodynamic Calculating Model selects the SRK models of art-recognized maturation, PR models etc., is not necessarily to repeat herein.For example, can lead to
" calculation of thermodynamics that the balances each other module " crossed in meter application carries out above-mentioned calculating process.
(4) by pressure P before and after throttle valve1、P2Relative size, differentiate current work flow.If P1>P2, then to adopt
Gas operation；It is on the contrary then be gas injection operation.
(5) if being currently gas production job state, it is entrained with a certain amount of condensed liquid or water flooding in natural gas, calculates single
The gas phase of well, liquid phase flow, theoretical blank derive from Perkins models, it is contemplated that the slippage between liquid phase influences.Example
Such as, above-mentioned calculating process can be carried out by " the Multiphase Flow Mechanics Calculation module " in meter application.Fig. 3 is shown
Throttling process schematic diagram, with reference to Fig. 3, calculating process is as follows：
Introduce the slip factor R between liquid phase：
In formula, ug、uLThe respectively local flow velocity of gas, liquid.
To sub-critical flow, slip factor can use Grolmes＆Leung models to describe：
In formula, αi(i=0,1,2,3) it is fitting constant；xgFor the mass fraction of gas phase；ρg、ρLRespectively gas phase, liquid phase
Density；μg、μLRespectively gas phase, the dynamic viscosity of liquid phase.
After considering the slippage between liquid phase, hybrid density ρmFor：
Assuming that gas makees constant entropy expansion campaign in throttling process, then constant entropy expansion index is defined to gas-liquid phase mixture：
In formula, k is gas adiabatic exponent；Cvg、CLThe respectively specific heat at constant volume of gas, liquid.
According to the state equation of thermodynamics isentropic motion, then have：
Npdv=-vdp (5)
In formula, p is pressure；V is than volume.
Above formula is integrated, following equilibrium relation can be obtained：
According to Perkins models, ignore gas internal energy influence, the dynamic energy-balance equation of the gas-liquid polyphase flow of throttling process
It can be expressed as：
In formula,For the mixing quality flow of liquid phase.
Formula (3), formula (6) are substituted into formula (7), can be obtained：
In formula, vg、vLThe respectively ratio volume of gas, liquid.
Defining pressure ratio r is：
Hybrid density expression formula (3) is substituted into formula (8) to obtain：
Meanwhile defining α：
It can be obtained according to formula (6)：
Formula (11), formula (12) are substituted into formula (10), had：
After further arranging formula (13), obtain：
WhenWhen, formula (14) can abbreviation be further：
When fluidised form is critical flow, the following differential equation should be met：
Above formula is integrated, abbreviation obtains：
WhenWhen, formula (17) can be further simplified as：
To formula (17) or formula (18), r can be solved using iterative methodc。
As r >=rcWhen, fluidised form is sub-critical flow, and mass flow is calculated using formula (17) or formula (18)As r ＜ rcWhen, stream
State is critical flow, mass flowIt is calculated using following methods：
IfIt can be carried out simplifying calculating with following formula：
Calculate mass flowAfterwards, gas phase, the volume flow of liquid phase are solved by following equation：
In formula, QgscFor volume flow of the gas in the case where marking condition, ρgscFor density of the gas in the case where marking condition, C is that distribution is
Number,For mass flow, xgFor the mass fraction of gas phase, QLFor the volume flow of liquid phase, ρLFor the density of liquid phase.
(6) if being currently gas injection job state, throttle valve is typically in full-gear, i.e. CD=1.0, injection it is natural
Gas is the higher dry gas of purity, and choke pressure drop is smaller, calculates the gas flow of individual well (for example, can be by using metrology applications
" single-phase flow Mechanics Calculation module " in program is calculated), calculating process is as follows：
According to thermodynamic principles, critical pressure ratio is：
As r≤rcWhen, fluidised form is critical flow；Otherwise it is sub-critical flow.
According to the equal Entropy principles of gas throttling, for sub-critical flow state, the relationship of flow and pressure ratio is represented by：
For critical flow, maximum airflow and p2It is unrelated, it is calculated as the following formula：
In formula, QgscFor volume flow of the gas in the case where marking condition, d is throttle valve eye diameter, and Z is Gaseous Z-factor,
γgFor the relative density of natural gas, P1、P2For the pressure before and after throttle valve, r is pressure ratio,K is that gas thermal insulation refers to
Number, T1To measure a temperature before throttle valve.
According to result of calculation above, display and storage flow measurement result.
In addition, to ensure that metering is in degree of precision level always, need periodically demarcate device.According to metering performance
Practical manifestation, scalar period is generally 1~3 year.Two kinds of optional gauging calibration data sources are as follows：
1, calibration connector 4, the hose coupling of connection mobile metering device (such as vehicle-mounted cyclonic separation metering sled), the meter are removed
The device of amount device and the utility model measures note, the gas production of the well simultaneously.
2, closing well measures the flow of downstream production separator after stablizing (more wells share)；Then well is opened, under measuring after stablizing
Swim the flow of production separator (more wells share).Qi Jing, stop well during downstream separator flow difference be the well actual measurement
Yield opens well stage utility model device while measuring the well gas production.
Above-described embodiment is merely to illustrate the utility model, wherein realizing gas storage by different throttle styles or throttling series
Used by library individual well natural gas filling adopts structure, connection type and manufacture craft of each component of metering etc. and measuring software
Computation model may be changed, and every equivalents carried out on the basis of technical solutions of the utility model and change
Into should not exclude except the scope of protection of the utility model.
Each embodiment of the utility model is described above, above description is exemplary, and non-exclusive, and
And it is also not necessarily limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for
Many modifications and changes will be apparent from for those skilled in the art.
Claims (8)
1. a kind of underground natural gas storage individual well note adopts same pipe bidirectional measuring device, which is characterized in that described device includes：
Sequentially connected first temperature and pressure measure straight tube, throttle valve and the second temperature and pressure and measure straight tube, and first temperature and pressure measure straight tube
One end be communicated in the gas storage, the other end is communicated in the throttle valve, and one end that second temperature and pressure measure straight tube is stretched out
The gas storage, the other end are communicated in the throttle valve；
Pressure sensor, the pressure sensor are separately positioned on that first temperature and pressure measure straight tube and the second temperature and pressure measure straight tube
On；
Temperature sensor, the temperature sensor are separately positioned on that first temperature and pressure measure straight tube and the second temperature and pressure measure straight tube
On；
Processing unit is measured, the metering processing unit is communicatively coupled to the throttle valve, the pressure sensor and the temperature
Sensor is spent, for calculating gas flow.
2. underground natural gas storage individual well note according to claim 1 adopts same pipe bidirectional measuring device, which is characterized in that
First temperature and pressure measure straight tube and the second temperature and pressure measure straight tube and are vertically arranged, and the throttle valve setting is around the corner.
3. underground natural gas storage individual well note according to claim 1 adopts same pipe bidirectional measuring device, which is characterized in that
Further comprise demarcating connector straight tube, the calibration connector straight tube is connected to one end that second temperature and pressure measure straight tube.
4. underground natural gas storage individual well note according to claim 3 adopts same pipe bidirectional measuring device, which is characterized in that
It is dismountable installation that calibration connector straight tube measures straight tube with second temperature and pressure.
5. underground natural gas storage individual well note according to claim 3 adopts same pipe bidirectional measuring device, which is characterized in that
First temperature and pressure measure that straight tube, the throttle valve, second temperature and pressure measure straight tube, the calibration connector straight tube passes sequentially through
Flange is tightly formed by connecting.
6. underground natural gas storage individual well note according to claim 1 adopts same pipe bidirectional measuring device, which is characterized in that
The metering processing unit is remote computer workstations or microcontroller.
7. underground natural gas storage individual well note according to claim 1 adopts same pipe bidirectional measuring device, which is characterized in that
One end that first temperature and pressure measure straight tube is communicated in gas storage and is exported as gas production entrance and gas injection, and second temperature and pressure measure
One end of straight tube is stretched out gas storage and is exported as gas injection entrance and gas production.
8. underground natural gas storage individual well note according to claim 1 adopts same pipe bidirectional measuring device, which is characterized in that
The throttle valve is provided with jaw opening sensor.
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| CN201721221685.8U CN207990210U (en) | 2017-09-21 | 2017-09-21 | Underground natural gas storage individual well note adopts same pipe bidirectional measuring device |
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|---|---|---|---|
| CN201721221685.8U CN207990210U (en) | 2017-09-21 | 2017-09-21 | Underground natural gas storage individual well note adopts same pipe bidirectional measuring device |
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| CN207990210U true CN207990210U (en) | 2018-10-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927444A (en) * | 2020-08-31 | 2020-11-13 | 中国石油集团渤海钻探工程有限公司 | Method for evaluating gas injection capacity of depleted oil-gas reservoir gas storage |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111927444A (en) * | 2020-08-31 | 2020-11-13 | 中国石油集团渤海钻探工程有限公司 | Method for evaluating gas injection capacity of depleted oil-gas reservoir gas storage |
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