CN1105448A - Method for measuring three-phase flow of oil, gas and water and apparatus thereof - Google Patents
Method for measuring three-phase flow of oil, gas and water and apparatus thereof Download PDFInfo
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- CN1105448A CN1105448A CN 94108458 CN94108458A CN1105448A CN 1105448 A CN1105448 A CN 1105448A CN 94108458 CN94108458 CN 94108458 CN 94108458 A CN94108458 A CN 94108458A CN 1105448 A CN1105448 A CN 1105448A
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Abstract
The method and device for measuring flows of oil, gas and water, especially for metering the output of crude oil and natural gas in oil well features that the total flow and speed of three phases are at first measured and pressure difference of sampling pipe is then measured to obtain the ratios of gas to oil and oil to water and then to obtain flow of each phase. Trunk is connected via tree-way to main and sampling pipelines. Temp., pressure and pressure difference sensors are connected with secondary meters. Its advantages include no need of gas-liquid separation, and high reliability and accuracy.
Description
The invention belongs to field of measuring technique, further relate to a kind of correlation analysis and pressure differential measuring method and device thereof that is used for crude oil, rock gas and water three-phase flow.
In the crude production process, crude oil, rock gas are to exist simultaneously with water and by being exploited out, along with prolongation, the water cut of oil mining process can get more and more.Simultaneously, the small sand grains that quantity does not wait also can be entrained in the three-phase fluid, brings many difficulties to flow measurement.Current measuring methods is after liquid (oil and aqueous mixtures) and natural gas via are added thermal release, and with single-phase flowmeter metering, entire equipment is huge, investment and operating cost height respectively.Complicated operation will consume a large amount of rock gases when adding the thermal release gas-liquid two-phase fluid.One cover metering outfit is share for 3-8 mouth oil well, and every mouthful of oil well was measured 1-2 hour every day, therefore, can't provide the precise output of each mouthful oil well exactly.At present, the oil-gas-water three phase flow quantity instrument that the European energy project company of external existing oil-gas-water three phase flow quantity instrument such as Britain produces, structure is very complicated, with two cover gamma-radiations decay instrument measurement liquid-gas ratio and ow ratios, the gross weight of equipment amount reaches No. 10, and price is 30-40 ten thousand pounds.Similarly model machine and the Britain company that also has U.S. Texco oil company to propose is similar, adopts the gamma-radiation damped method to measure oil-gas ratio, and the greatest problem that this measuring method exists is that precision is low, costs an arm and a leg." external oilfield engineering " the 2nd phase in 1992 " a kind of novel three-phase flow meter "; 1993 the 2nd phases " external Multiphase Fluid Measurement Technology development recent developments ".
The purpose of this invention is to provide a kind of the realization to the automatically continuous On-line Measuring Method of oil-gas-water three phase flow quantity.
Another object of the present invention provides a kind of oil-gas-water three phase flow quantity measurement mechanism reliable, stable, that measuring accuracy is high and cost is low of measuring.
Flow-measuring method of the present invention divided for three steps, and the first step is with the total flow speed of electric capacity correlation analysis commercial measurement oil gas water three phase potpourri; In second step, the pressure reduction with differential pressure pick-up measurement sampling pipe obtains ratio and the profit ratio of liquid phase in three-phase mixture thus; In the 3rd step,, obtain the flow of oil, gas, each phase of water respectively according to the heterogeneous fluid flow theory.
Measurement mechanism of the present invention comprises sampling pipe, sensor, signals collecting and treating apparatus.Sampling pipe is vertically placed, it is connected with the main channel with trunk line by three-way interface, the bottom of sampling pipe and main channel is equipped with by-pass valve control respectively, form inverted U profit and gas proportion measurement section by two nonmetal insulation tubes of same diameter, the height that is loaded on the fluid pressure differential measured hole at measuring section two ends respectively equates.The cell pressure reaction diaphragm is opened three-phase fluid and pressure transmission fluid partitioning, and capacitive transducer is loaded on the outer wall of nonmetal insulation tube respectively, and links to each other with the high sensitivity capacitor respectively.Temp-sensitive sensor, pressure transducer, pressure differential survey sensor all link to each other with secondary instrument, and the voltage of secondary instrument collection, electric current carry out correlation analysis and data processing by the electric capacity instrument.
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the one-piece construction synoptic diagram of apparatus of the present invention.
The trunk line 1 that links to each other with oil well in apparatus of the present invention connects vertical sampling pipeline 2 and main channel 4 respectively through three-way connection, and the length of vertical sampling pipeline 2 is greater than 0.5 meter.Main channel 4 and trunk line 1 be top locates to make into horizontal level more than 0.2 meter.The bottom mounted valve 3 of vertical sampling pipeline 2, the outlet tandem place mounted valve 5 of sampling passage 2 and main channel 4.Temp-sensitive sensor 6 and pressure transducer 7 are loaded on respectively in the horizontal trunk line 4.Two nonisulated pipe 8,9 two ends connect with flange 10,11,12,13, and insulation tube 8,9 is formed the inverted U measuring section.Fluid pressure differential measured hole 14,15,16, the 17 contour respectively two ends that are loaded on nonmetal insulation tube 8,9, each output terminal links to each other with pressure differential survey sensor 21,22 respectively.Measurement mechanism 18,19 places the two ends of vertical sampling pipeline 2, and pressure differential survey sensor 20 is connected with measurement mechanism 18,19.Capacitive transducer 23,24 is loaded on the outer wall of nonmetal insulation tube 8, and links to each other with high sensitivity electric capacity instrument 25,26 through cable respectively, and two electric capacity instrument adopt same oscillation source, and anti-stop signal disturbs mutually.Temp-sensitive sensor 6, pressure transducer 7, pressure differential survey sensor 20,21,22, high sensitivity electric capacity instrument 25,26 and secondary instrument 27 join, and secondary instrument 27 is gathered voltage, the magnitude of current, carries out correlation analysis and data processing by electric capacity instrument 25,26.
The present invention uses with capacitive transducer 23,24 and receives fluid flow signal, and these signals are carried out correlation analysis, through measuring the total flow speed of oil gas water three phase potpourri.
Rxy（τ）＝
1/(T) ∫
T 0x（t-τ）y（t）dt（1）
τ corresponding to the maximum value of cross-correlation coefficient
mPromptly be that fluid passes through distance and is the distance between two sensors of S() speed.
Two capacitive transducers 23,24 adopt same oscillation source, in case the mutual interference of stop signal phase.The three-phase mixture total flow is like this
Q
Always=KS/ τ mA (2)
In the formula, K is the constant that flows, and flows relevant with polyphasic flow.A is that pipeline section is long-pending.
Second step: the pressure differential survey sensor 21,22 with a kind of particular design is measured the pressure differential at measurement mechanism 14,15 and 16,17 places, and can obtain the ratio of liquid phase in three-phase mixture thus:
1/2 (△ P
14.5-△ P
16.17)=h
Gasρ
Gas+ h
Oilρ
Oil+ h
Waterρ
Water(3) in the formula, h is a phase ratio, and ρ is a density.
By same step, applying pressure difference measurements sensor 20 is measured the pressure differential at measurement mechanism 18,19 places, obtains the profit ratio
h
Oil/ h
Water=f(△ P
18.19) (4)
The 3rd step: according to the heterogeneous fluid flow theory, find the solution formula (2), (3) and (4), obtain the flow of oil, gas, each phase of water
Q oil=K oil h oil Q total (5)
Q water=K water h water Q total (6)
Q gas=K gas h gas Q total (7)
In the formula, K oil, K water, K gas are coefficient of flow.
The present invention can be applicable to crude oil, the gas production metering of oilfield. Having does not need gas-liquid separation, and volume is little, certainty of measurement height, Measurement sensibility, reliable characteristics.
Claims (4)
1, the measuring method of oil-gas-water three phase flow quantity is characterized in that, the concrete steps of oil-gas-water three phase flow quantity being carried out on-line measurement are: the first step, with the total flow speed of electric capacity correlation analysis commercial measurement oil, gas, water three-phase mixture; In second step, the pressure reduction with differential pressure pick-up measurement sampling pipe obtains ratio and the profit ratio of liquid phase in three-phase mixture thus; In the 3rd step,, obtain the flow of oil, gas, each phase of water respectively according to the heterogeneous fluid flow theory.
2, the oil-gas-water three phase flow quantity measurement mechanism, it comprises sampling pipe, sensor, signals collecting and treating apparatus, it is characterized in that: described sampling pipe vertically is provided with, it is connected with the main channel with trunk line by three-way interface, the bottom of sampling pipe and main channel is equipped with by-pass valve control respectively, form inverted U profit and gas proportion measurement section by two nonmetal insulation tubes of same diameter, the height that is loaded on the fluid pressure differential measured hole at measuring section two ends respectively equates, pressure differential survey sensor in the described sensor is the noncontact telemetering type, the cell pressure reaction diaphragm is opened three-phase fluid and pressure transmission fluid partitioning, capacitive transducer is loaded on the outer wall of nonmetal insulation tube respectively, and link to each other with the high sensitivity capacitor respectively, temp-sensitive sensor and pressure transducer are loaded on respectively in the trunk line of level, temp-sensitive sensor, pressure transducer, the pressure differential survey sensor all joins with secondary instrument, the voltage that secondary instrument is gathered, the magnitude of current carries out correlation analysis and data processing by the electric capacity instrument.
3, oil-gas-water three phase flow quantity measurement mechanism as claimed in claim 2, it is characterized in that: the length of described vertical sampling section is greater than 0.5 meter, the control valve of vertical sampling section bottom is used for regulating oil water mixture flowing velocity in the vertical sampling section, makes flowing velocity less than 0.01m/s.
4, oil-gas-water three phase flow quantity measurement mechanism as claimed in claim 2 is characterized in that: described main channel with locate to being horizontally disposed with more than 0.2 meter above the trunk line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94108458 CN1105448A (en) | 1994-07-14 | 1994-07-14 | Method for measuring three-phase flow of oil, gas and water and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94108458 CN1105448A (en) | 1994-07-14 | 1994-07-14 | Method for measuring three-phase flow of oil, gas and water and apparatus thereof |
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| CN1105448A true CN1105448A (en) | 1995-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94108458 Pending CN1105448A (en) | 1994-07-14 | 1994-07-14 | Method for measuring three-phase flow of oil, gas and water and apparatus thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998022783A1 (en) * | 1996-11-19 | 1998-05-28 | Jianwen Dou | A device and a method of measuring flow rate for a three phase fluid |
| CN100351493C (en) * | 2005-05-08 | 2007-11-28 | 西安交通大学 | Measuring method of under well oil, gas and water three-phase flow and its device |
| CN101479575B (en) * | 2006-05-05 | 2011-01-26 | 多相仪表公司 | A method and apparatus for tomographic multiphase flow measurements |
| CN102080531A (en) * | 2009-11-30 | 2011-06-01 | 郭腾明 | Method for production metering of oil wells |
| CN101509795B (en) * | 2008-02-15 | 2012-02-22 | 天津瑞吉德科技有限公司 | On-line instant measuring method and apparatus for oil-gas-water three phase flow quantity |
| CN101525995B (en) * | 2009-04-22 | 2012-05-09 | 西安三林能源科技工程有限公司 | Gas and liquid multiphase quantitative measuring device and method thereof |
| CN102465701A (en) * | 2010-11-14 | 2012-05-23 | 兰州海默科技股份有限公司 | On-line sampling device for multi-phase flow liquid |
| CN103196505A (en) * | 2013-04-22 | 2013-07-10 | 刘建中 | Detecting method, detecting device and calculating method of three-phase fluid proportions and flow |
| CN105866182A (en) * | 2016-04-11 | 2016-08-17 | 中国石油天然气股份有限公司 | Online observation and measurement device based on pumping unit well |
| CN107607178A (en) * | 2017-09-21 | 2018-01-19 | 山东省科学院海洋仪器仪表研究所 | A kind of experimental provision of oil gas water three phase flow measurement |
-
1994
- 1994-07-14 CN CN 94108458 patent/CN1105448A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998022783A1 (en) * | 1996-11-19 | 1998-05-28 | Jianwen Dou | A device and a method of measuring flow rate for a three phase fluid |
| CN100351493C (en) * | 2005-05-08 | 2007-11-28 | 西安交通大学 | Measuring method of under well oil, gas and water three-phase flow and its device |
| CN101479575B (en) * | 2006-05-05 | 2011-01-26 | 多相仪表公司 | A method and apparatus for tomographic multiphase flow measurements |
| CN101509795B (en) * | 2008-02-15 | 2012-02-22 | 天津瑞吉德科技有限公司 | On-line instant measuring method and apparatus for oil-gas-water three phase flow quantity |
| CN101525995B (en) * | 2009-04-22 | 2012-05-09 | 西安三林能源科技工程有限公司 | Gas and liquid multiphase quantitative measuring device and method thereof |
| CN102080531B (en) * | 2009-11-30 | 2013-03-06 | 郭腾明 | Method for production metering of oil wells |
| CN102080531A (en) * | 2009-11-30 | 2011-06-01 | 郭腾明 | Method for production metering of oil wells |
| CN102465701A (en) * | 2010-11-14 | 2012-05-23 | 兰州海默科技股份有限公司 | On-line sampling device for multi-phase flow liquid |
| CN102465701B (en) * | 2010-11-14 | 2014-09-24 | 兰州海默科技股份有限公司 | On-line sampling device for multi-phase flow liquid |
| CN103196505A (en) * | 2013-04-22 | 2013-07-10 | 刘建中 | Detecting method, detecting device and calculating method of three-phase fluid proportions and flow |
| CN103196505B (en) * | 2013-04-22 | 2016-04-06 | 刘建中 | A kind of three-phase fluid ratio and flow testing device and computing method |
| CN105866182A (en) * | 2016-04-11 | 2016-08-17 | 中国石油天然气股份有限公司 | Online observation and measurement device based on pumping unit well |
| CN107607178A (en) * | 2017-09-21 | 2018-01-19 | 山东省科学院海洋仪器仪表研究所 | A kind of experimental provision of oil gas water three phase flow measurement |
| CN107607178B (en) * | 2017-09-21 | 2024-05-10 | 山东省科学院海洋仪器仪表研究所 | Experimental device for oil-gas-water three-phase flow measurement |
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