CN102364046B - Multi-phase flow meter for underground pipeline - Google Patents
Multi-phase flow meter for underground pipeline Download PDFInfo
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- CN102364046B CN102364046B CN201110238251.XA CN201110238251A CN102364046B CN 102364046 B CN102364046 B CN 102364046B CN 201110238251 A CN201110238251 A CN 201110238251A CN 102364046 B CN102364046 B CN 102364046B
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Abstract
The invention relates to a multi-phase flow meter for an underground pipeline. The flow meter is characterized in that: two groups of light intensity modulation type optical fiber sensors are arranged at an outlet of an oil well pipeline to measure light reflectivity and light transmissivity of crude oil respectively; the proportion occupied by each phase in unit time of oil-gas-water three-phase mixed liquid can be calculated through processing; the average flow rate in the unit time of the mixed liquid is then measured by using a phase modulation type optical fiber sensor; and the flow rate in the unit time of each single phase is calculated according to proportional relation. Data is comprehensively analyzed and processed by using TMS320LF2407A, so that the quality of the crude oil can be judged in real time, and thereby, necessary data is provided for a rapid correction oil extraction process. The flow meter has the advantages of high accuracy in acquired data, good multi-phase flow rate discrimination effect, convenience in use and flexible in operation, is a practical multi-phase flow meter and has broad application prospect in the fields of oil fields and the like.
Description
Technical field
The present invention relates to a kind of multi-phase flowmeter for down-hole pipe, belong to data acquisition processing system, be suitable for the fields such as oil field.
Background technology
Current, global energy crisis, oil price surpasses 100 dollars/barrel, and for better recover petroleum, energy conservation, requires more and more higher to the data processing in recover petroleum.
The technology of mainly using in oil exploitation is: need to measure after some data, according to these data, calculate again the flow of each phase, flow accuracy is greatly affected, and most of multi-phase flowmeters each phase measure error under most of fluidised form is ± 10% in the market; All characteristics that all require to grasp at present fluid for the technology of heterogeneous metering as dielectric constant, mass-absorption coefficient etc., could be measured more accurately.If changing appears in fluid behaviour or multi-phase flowmeter measures for many wells, must evaluate frequently and demarcate the sensor of multi-phase flowmeter.
The problem and the shortcoming that exist are: on market, the highest applicable void fraction of several main multi-phase flowmeters is 0.9%～1.0%, and along with the increase of void fraction, the measuring accuracy of liquid phase will be affected; Multi-phase flowmeter generally adopts as radiation sources such as microwaves, and regulations is to being used radiation source to have strict restriction; Present multi-phase flowmeter is demarcated facility can only demarcate component measuring apparatus preferably, and flow-speed measurement is not yet had to gratifying scaling method.
Summary of the invention
The technical problem solving
For fear of the deficiencies in the prior art part, the present invention proposes a kind of multi-phase flowmeter for down-hole pipe, according to the variation of heterogeneous fluid optical index, release the ratio of each component, without multiphase flow being carried out to separation, just can realize the real time discriminating to former oil quality, thereby reach the object of quick correction oil production technology.
Thought of the present invention is: designed and take the multi-phase flowmeter signal processing circuit that TMS320LF2407A chip is core; Designed the Fibre Optical Sensor that is applied to this kind of multi-phase flowmeter; Design sensor signal becomes send transmission circuit.
Technical scheme
For a multi-phase flowmeter for down-hole pipe, it is characterized in that comprising down-hole acquisition subsystem and aboveground processing subsystem; Described down-hole acquisition subsystem comprise Fibre Optical Sensor group, temperature pick up, pressure sensor and with the voltage current adapter connecting separately, temperature pick up and pressure sensor are arranged on the tube wall of oil country tubular good exit pipeline one side, the temperature signal of temperature pick up becomes current signal transfer to aboveground processing subsystem after changing by voltage current adapter, and the pressure signal of pressure sensor becomes current signal transfer to aboveground processing subsystem after changing by voltage current adapter; Fibre Optical Sensor group comprises light source, two sapphire lens, two intensity modulation type Fibre Optical Sensors and phase modulation-type Fibre Optical Sensor, parallel light source, intensity modulation type Fibre Optical Sensor and the phase modulation-type Fibre Optical Sensor of arranging of a side at tube wall, intensity modulation type fiber sensor measuring is through the intensity of reflected light of piping, and by optical-electrical converter with after voltage current adapter conversion, become extremely aboveground processing subsystem of current signal transfer; At opposite side tube wall, on the optical axis of light source, be provided with intensity modulation type Fibre Optical Sensor, measure the transmitted intensity through piping, and become current signal transfer to aboveground processing subsystem by optical-electrical converter with after voltage current adapter conversion; Receiving terminal at the transmitting terminal of light source and the intensity modulation type Fibre Optical Sensor of a relative side is provided with sapphire lens; Described aboveground processing subsystem comprises current-to-voltage convertor, A/D converter, reshaper, counter and DSP digital processing unit, the data of acquisition subsystem under current-to-voltage convertor received well, through current-to-voltage convertor, be converted to voltage signal, after A/D converter enters, form data signal and export DSP digital processing unit to; Reshaper is pulse signal by the signal shaping of current-to-voltage convertor, exports counter pulse signals to and counts.
Described DSP digital processing unit adopts TMS320LF2407A chip.
Described light source is large-power light-emitting diodes.
Beneficial effect
A kind of multi-phase flowmeter for down-hole pipe that the present invention proposes, has two obvious advantages: one, accuracy of data acquisition is high.Because optical pickocff is inner at oil well, in crude oil, gas not yet volatilizees, and the data reliability obtaining is like this high; Two, DSP rapid analysis data, native system adopts TMS320LF2407A as digital signal processor, can process multiple signals simultaneously, and can guarantee that system high efficiency is stable.
Accompanying drawing explanation
Fig. 1: systematic schematic diagram of the present invention;
Fig. 2: installation of sensors schematic diagram of the present invention;
Fig. 3: light path principle figure of the present invention;
Fig. 4: the shaper of embodiment of the present invention frequency signal, counter circuit schematic diagram;
Fig. 5: the voltage current adapter of embodiment of the present invention temperature pick up;
Fig. 6: the voltage current adapter of embodiment of the present invention pressure sensor.
The specific embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
The embodiment of the present invention is shown in accompanying drawing 1, comprises down-hole acquisition subsystem and aboveground processing subsystem, and down-hole acquisition subsystem is delivered to aboveground processing subsystem by the signal collecting, and aboveground processing subsystem is by mean flow rate V, light transmission I
t, light reflectivity I
r, pressure P, these 5 signals of temperature T analog signal process after being converted to data signal, obtain measurement result.
Described aboveground signal processing subsystem: see Fig. 1, Fig. 4: comprise current-to-voltage convertor, A/D converter, reshaper, counter and DSP digital processing unit, the data of acquisition subsystem under current-to-voltage convertor received well, through current-to-voltage convertor, be converted to voltage signal, after A/D converter enters, form data signal and export DSP digital processing unit to; Reshaper is pulse signal by the signal shaping of current-to-voltage convertor, exports counter pulse signals to and counts.
Down-hole acquisition subsystem is sent 4～20mA current signal He Yi road, Si road frequency signal.Directly by 150 Ω precision resistances, be converted to the voltage signal of 0.6～3V, by A/D converter, gathered; The frequency signal of 4～20mA converts to after voltage signal, by voltage reshaper, it is shaped as to pulse signal, utilize counter pulse signals counting (seeing Fig. 5), the count results in one section of specified time interval, after latching, can be gathered by the I/O interface of processor.A/D converter adopts the AD574 chip of AD company, and it converts analog signal to DSP digital processing unit manageable data signal.DSP adopts TMS320LF2407A chip, and the data signal collecting is processed.Deposit successively result in sheet outer FLASH memory, host computer regularly reads by RS-485 serial communication interface.
Mean flow rate V, light transmission I
t, light reflectivity I
r, after pressure P, these 5 signals of temperature T obtained by processor, can calculate or table look-up according to certain relation and draw oil gas water ratio and each single-phase flow.Deposit data in sheet outer FLASH memory, by host computer, by RS-485 serial communication interface, regularly read.Sampling time interval and gate time length need to, according to on-site actual situations, arrange in gathering control software.Relation between oil gas water ratio and semaphore does not temporarily also have strict mathematical derivation formula, need to demarcate according to experimental data, obtains empirical formula.
Described down-hole acquisition subsystem is shown in Fig. 2, Fig. 3, comprise Fibre Optical Sensor group, temperature pick up, pressure sensor and with the voltage current adapter connecting separately, temperature pick up and pressure sensor are arranged on the tube wall of oil country tubular good exit pipeline one side, the temperature signal of temperature pick up becomes current signal transfer to aboveground processing subsystem after changing by voltage current adapter, and the pressure signal of pressure sensor becomes current signal transfer to aboveground processing subsystem after changing by voltage current adapter; Fibre Optical Sensor group comprises light source, two sapphire lens, two intensity modulation type Fibre Optical Sensors and phase modulation-type Fibre Optical Sensor, parallel light source, intensity modulation type Fibre Optical Sensor and the phase modulation-type Fibre Optical Sensor of arranging of a side at tube wall, intensity modulation type fiber sensor measuring is through the intensity of reflected light of piping, and by optical-electrical converter with after voltage current adapter conversion, become extremely aboveground processing subsystem of current signal transfer; At opposite side tube wall, on the optical axis of light source, be provided with intensity modulation type Fibre Optical Sensor, measure the transmitted intensity through piping, and become current signal transfer to aboveground processing subsystem by optical-electrical converter with after voltage current adapter conversion; Receiving terminal at the transmitting terminal of light source and the intensity modulation type Fibre Optical Sensor of a relative side is provided with sapphire lens.
A is crude oil, and B is the light beam that light source 1 sends, and C is sapphire lens, and D is folded light beam.Intensity modulation type Fibre Optical Sensor 2, measures light transmission I
t, light reflectivity I
r; Phase modulation-type Fibre Optical Sensor 3, measures mean flow rate V; With pressure sensor 4, gaging pressure P; With temperature pick up 5, measure temperature T.First the signal that Fibre Optical Sensor obtains will pass through optical fibre voltage sensor, converts voltage signal to.Because distance between the sensor of down-hole and ground based processor is longer, in order to reduce the impact of signal attenuation and interference, sensor signal also needed through voltage current transformation before delivering to processor, converted the current signal of 4～20mA to.I
t, I
r, the voltage-current converter circuit of V, optical-electrical converter, adopt ripe product for the voltage current adapter of P and T, see Fig. 5, Fig. 6.
In native system, selecting core diameter is the quartzy step multimode fibre of 62.5um, for improving the reliability of system works, at optical fiber added metal or plastic protective sleeve, avoids optical fiber to receive damage in severe working environment.Adopt large-power light-emitting diodes as the light source of Fibre Optical Sensor.Utilize intensity modulation type Fibre Optical Sensor, sensor probe is inserted to 5～10mm in pipeline, utilize two photoelectric tubes to detect respectively the variation of transmitted light and intensity of reflected light, just can calculate by certain relation oil gas water three's ratio.Fibre Optical Sensor requires light source highly stable, and power is more than milliwatt level, otherwise cannot penetrate mixing material.Use phase modulation-type optical fiber processing device to measure mixing material mean flow rate, according to Optical Doppler phenomenon, loaded the folded light beam of flow velocity signal and another road and projected on photo-detector after relevant with reference to folded light beam and obtain a class frequency signal, the height of frequency has represented the size of mean flow rate.The mensuration of flow velocity and oil-water-gas ratio can be used same light source.
Claims (3)
1. for a multi-phase flowmeter for down-hole pipe, it is characterized in that comprising down-hole acquisition subsystem and aboveground processing subsystem; Described down-hole acquisition subsystem comprise Fibre Optical Sensor group, temperature pick up, pressure sensor and with above-mentioned three voltage current adapters that part connects, temperature pick up and pressure sensor are arranged on the tube wall of oil country tubular good exit pipeline one side, the temperature signal of temperature pick up becomes current signal transfer to aboveground processing subsystem after changing by voltage current adapter, and the pressure signal of pressure sensor becomes current signal transfer to aboveground processing subsystem after changing by voltage current adapter; Fibre Optical Sensor group comprises light source, two sapphire lens, two intensity modulation type Fibre Optical Sensors and phase modulation-type Fibre Optical Sensor, parallel light source, intensity modulation type Fibre Optical Sensor and the phase modulation-type Fibre Optical Sensor of arranging of a side at tube wall, intensity modulation type fiber sensor measuring is through the intensity of reflected light of piping, and by optical-electrical converter with after voltage current adapter conversion, become extremely aboveground processing subsystem of current signal transfer; At opposite side tube wall, on the optical axis of light source, be provided with intensity modulation type Fibre Optical Sensor, measure the transmitted intensity through piping, and become current signal transfer to aboveground processing subsystem by optical-electrical converter with after voltage current adapter conversion; Receiving terminal at the transmitting terminal of light source and the intensity modulation type Fibre Optical Sensor of a relative side is provided with sapphire lens; Described aboveground processing subsystem comprises current-to-voltage convertor, A/D converter, reshaper, counter and DSP digital processing unit, the data of acquisition subsystem under current-to-voltage convertor received well, through current-to-voltage convertor, be converted to voltage signal, after A/D converter enters, form data signal and export DSP digital processing unit to; Reshaper is pulse signal by the signal shaping of current-to-voltage convertor, exports counter pulse signals to and counts.
2. according to claim 1 for the multi-phase flowmeter of down-hole pipe, it is characterized in that: described DSP digital processing unit adopts TMS320LF2407A chip.
3. according to claim 1 for the multi-phase flowmeter of down-hole pipe, it is characterized in that: described light source is large-power light-emitting diodes.
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| CN201110238251.XA CN102364046B (en) | 2011-08-18 | 2011-08-18 | Multi-phase flow meter for underground pipeline |
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| CN201110238251.XA CN102364046B (en) | 2011-08-18 | 2011-08-18 | Multi-phase flow meter for underground pipeline |
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| CN102364046B true CN102364046B (en) | 2014-04-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147744B (en) * | 2013-03-05 | 2015-05-20 | 中国石油大学(北京) | Spectral measurement device of horizontal well fluid flowing parameter |
| GB201408131D0 (en) * | 2014-05-08 | 2014-06-25 | Optasense Holdings Ltd | Fluid inflow |
| CN105114052A (en) * | 2015-04-27 | 2015-12-02 | 中国海洋石油总公司 | Multiphase flow flowmeter in well and monitor method |
| US10996091B2 (en) | 2015-07-23 | 2021-05-04 | Khalifa University of Science and Technology | System and method for real-time flow measurement in pipelines using THz imaging |
| CN105041300A (en) * | 2015-08-28 | 2015-11-11 | 中国海洋石油总公司 | Distributed optical fiber downhole collecting device, downhole flowmeter and downhole monitoring method |
| CN109450558B (en) * | 2018-12-14 | 2021-07-30 | 常州艾控智能仪表有限公司 | Anti-interference remote communication method for underground ground |
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2011
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Patent Citations (10)
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| CN1076023A (en) * | 1992-10-12 | 1993-09-08 | 郑刚 | A kind of all optical fibre multifunction sensor |
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