CN102998359A - Differential pressure type crude oil water cut analyzer and measuring method thereof - Google Patents

Differential pressure type crude oil water cut analyzer and measuring method thereof Download PDF

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Publication number
CN102998359A
CN102998359A CN2012103626944A CN201210362694A CN102998359A CN 102998359 A CN102998359 A CN 102998359A CN 2012103626944 A CN2012103626944 A CN 2012103626944A CN 201210362694 A CN201210362694 A CN 201210362694A CN 102998359 A CN102998359 A CN 102998359A
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China
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optoelectronic switch
crude oil
tubing string
chip microcomputer
oil
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CN2012103626944A
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Chinese (zh)
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刘宝军
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刘宝军
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Priority to CN2012103626944A priority Critical patent/CN102998359A/en
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Abstract

The invention relates an instrument for detecting crude oil moisture content-differential pressure type crude oil water cut analyzer and a measuring method thereof. The differential pressure type crude oil water cut analyzer is mainly composed of a singlechip, a display screen, a differential pressure transmitter, a control circuit, a photoelectric switch group, a signal processing circuit, two electromotion ball valves and pipe pillars, wherein the electric control ball valves are respectively connected with the two pipe pillars, and a motor drives the photoelectric switch group to vertically move. The measuring method provided by the invention applies an operating principle of the differential pressure transmitter, a sealing liquid in the diaphragm is transmitted on a measuring element, the measured differential pressure signal is converted to an electrical signal which corresponds to the differential pressure signal, pure water, pure oil and crude oil are utilized to respectively calculate to obtain a unit impulse voltage variation quantity, and finally the moisture content of the crude oil is figured out through the singlechip. The water cut analyzer provided by the invention realizes that the moisture content of crude oil is conveniently, rapidly and accurately measured under different conditions, and the measuring accuracy has the distinguishability of more than 0.01%.

Description

Differential pressure type water in oil analyzer and measuring method thereof
Technical field:
The present invention relates to a kind of device for measuring volumetric flow of fluid, specifically a kind of instrument for detection of water content in crude oil.
Background technology:
For field management, crude oil water content is a very important underlying parameter, the size of water content in crude oil both had been related to the defeated total amount of pipe of oil field mining liquid and the energy consumption of heating, and also was related to the fouling corrosion of pipe-line equipment, and affected the oil refining processing technology in later stage.Therefore must carry out accurate-metering and control to water percentage.
Crude oil water content also is an important indicator of crude transition metering: it is one of important test rating of crude oil outgoing, to the goodwill important: be again middle the parameter of crude production rate metering, crude transition measurement accuracy and several error in dippings with ten thousand tons are had direct impact.Therefore for guaranteeing the accurately just of the reliable and stable of former oil quality and handing-over metering thereof, dispatch from the factory water percentage and moisture measurement accuracy of crude oil all formulated relevant criterion both at home and abroad, China stipulates in SY7513-88 " ore removal crude oil technical conditions ", dispatching from the factory the water percentage of crude oil must not be greater than 3%, regulation in GB9109.1-88 " crude oil dynamic measurement rule ", should be in ± 0.1% as the moisture instrument limiting error that trade settlement is used, resolution should be ± and 0.01%.
This is the difficult problem that the oil field is faced for a long time how to detect fast and accurately crude oil water content.Although ten or twenty kind analyzer of water content is arranged in the market, all can not on metering accuracy and operation stability, all meet the needs of production.
Summary of the invention:
The object of the invention is to: a kind of new type measuring instrument device---the differential pressure type water in oil analyzer that can measure convenient, fast, exactly the water content in crude oil of different situations is provided.
The present invention is achieved in that
The present invention's differential pressure type water in oil analyzer mainly is made of single-chip microcomputer, differential pressure transmitter, control circuit, power pack, indicating circuit, display screen, optoelectronic switch group, motor, motor drive module, gear drive, signal conditioning circuit, electric-controlled ball valve and tubing string.
Control circuit is electrically connected with single-chip microcomputer and electric-controlled ball valve; Single-chip microcomputer is electrically connected with differential pressure transmitter, display screen, optoelectronic switch group, motor drive module, signal conditioning circuit respectively; Power pack is electrically connected with display screen, differential pressure transmitter and signal conditioning circuit, single-chip microcomputer, control circuit, optoelectronic switch group, motor drive module and electric-controlled ball valve, for it power supply; Optoelectronic switch is two, and is parallel with one another, separate operation; Electric-controlled ball valve has 2, connects respectively 2 tubing strings, plays on-off action; Motor drive module instruction motor rotation, the motor-driven gear gear train, gear drive links to each other with the optoelectronic switch group, and it is vertically mobile to drive the optoelectronic switch group.
Described optoelectronic switch group contains the optoelectronic switch that is fixed on this platform, and optoelectronic switch can be vertically mobile with photoelectric platform.
Described signal conditioning circuit, it is the circuit downstream of pressure unit, be the single-chip microcomputer transmission of signal, mainly be made of resistance and signal barrier assembly, the current signal that the signal barrier assembly is passed differential pressure transmitter back filters, and purifies current signal, use again resistance in series, convert current signal to voltage signal, because this resistance is larger, played the effect of amplifying signal.
Principle of work of the present invention is:
Electric-controlled ball valve links to each other with tubing string, as the valve of depositing tubing string liquid, opens or valve-off by control circuit, plays the purpose of discharge opeing;
Control circuit sends instruction to single-chip microcomputer, and single-chip microcomputer is carried out according to instruction, and signal is sent to motor drive module and optoelectronic switch group, and motor drives the optoelectronic switch group by gear drive and moves up from reference plane.Simultaneously optoelectronic switch scanning tubing string, when first optoelectronic switch moved to the spill liquid level, its high-low level began conversion, and this moment, optoelectronic switch transmitted signals to single-chip microcomputer and save data.The optoelectronic switch group continues to move up, until second optoelectronic switch high-low level conversion just stops movement, and passes signal back single-chip microcomputer and save data.
In the course of the work, signal conditioning circuit is put the differential pressure transmitter signal in order, and data back single-chip microcomputer the most at last, single-chip microcomputer be the data operation of passing back, and the water cut result is presented on the liquid crystal display.Single-chip microcomputer also can with other data, such as temperature, liquid height, magnitude of voltage etc., show by liquid crystal display during this time.
Method and step that this analyser contains water gaging are as follows:
1) pure water of separating in the crude oil is demarcated---pure water unit pulse voltage variety U water:
Annotate pure water in 2 tubing strings, liquid level must be higher than the optoelectronic switch reference plane, and both highly do not wait.Because the movement of optoelectronic switch group is by the single-chip microcomputer transmitted, trigger electric machine rotation, vertically mobile by the whole platform of gear driven, pulse of the every transmission of single-chip microcomputer, the height that platform movement is certain can equivalent be the umber of pulse that Dan Pinji sends so measure the height of liquid in the tubing string.Annotate pure water in 2 tubing strings, liquid level must be higher than the optoelectronic switch reference plane, and both highly do not wait; By control circuit operation instrument, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 1While single-chip microcomputer collection signal modulate circuit data U 1In tubing string 1, pour an amount of pure water into again behind the reset motor, starter motor again, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 2While single-chip microcomputer collection signal modulate circuit data U 2Because U value and N value are linear, single-chip microcomputer calculates according to both data:
U Water=(U 2-U 1)/(N 2-N 1);
2) fixed to the pure oil ga(u)ge of separating in the crude oil---pure oily unit pulse voltage variety U Oil:
Water in the tubing string 2 is constant, and the pure water in the tubing string 1 is replaced to pure oil, and liquid level must be higher than the optoelectronic switch reference plane; By control circuit operation instrument, it is N that the optoelectronic switch group moves the umber of pulse that records tubing string 1 liquid level 3, while single-chip microcomputer collection signal modulate circuit data U 3In tubing string 1, pour an amount of pure oil into again behind the reset motor, starter motor again, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 4While single-chip microcomputer collection signal modulate circuit data U 4Because U value and N value are linear, single-chip microcomputer calculates: U according to both data Oil=(U 4-U 3)/(N 4-N 3);
3) local crude oil is measured---crude monoglyceride digit pulse voltage variety U Crude oil:
Water in the tubing string 2 is constant, and the pure oil of tubing string 1 is replaced to crude oil, and liquid level must be higher than the optoelectronic switch reference plane; By control circuit operation instrument, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 5While single-chip microcomputer collection signal modulate circuit data U 5In tubing string 1, pour an amount of pure oil into again behind the reset motor, starter motor again, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 6While single-chip microcomputer collection signal modulate circuit data U 6Because U value and N value are linear, single-chip microcomputer calculates: U according to both data Crude oil=(U 6-U 5)/(N 6-N 5);
4) single-chip microcomputer is according to above-mentioned U Water, U OilAnd U Crude oil, make calculating:
Water content in crude oil=(U Crude oil-U Oil)/(U Water-U Oil) * 100%
Form with percentage provides test result at last.
The present invention is different according to the density between water and the oil, utilizes high precision differential pressure transmitter and single chip machine controlling circuit, and the water cut of crude oil finally is presented on the liquid crystal display.
The present invention uses the differential pressure transmitter principle of work, that is: the differential pressure from the bilateral tubing string directly acts on the sensor bilateral isolation diaphragm of transmitter, conduct on the measuring sensor by the sealing liquid in the diaphragm, measuring sensor is converted to corresponding with it electric signal with the differential pressure signal that records.In the present invention, this electric signal is with the form performance of voltage.Because the height of this voltage variety and water or oil is linear, therefore can calculate respectively the unit pulse voltage variety with pure water, pure oil and crude oil; Calculate at last the water cut of crude oil by single-chip microcomputer.The present invention's analyzer of water content, realized convenient, fast, measure the water cut of different situation crude oil exactly, measuring accuracy can reach other products inaccessible 0.01% even higher resolution.
Below in conjunction with drawings and Examples, the present invention will be further described:
Description of drawings:
The schematic block circuit diagram of Fig. 1, the embodiment of the invention;
The structural representation of Fig. 2, the embodiment of the invention;
The workflow synoptic diagram of Fig. 3, the embodiment of the invention.
Embodiment:
Fig. 1 has shown the circuit theory of present embodiment
Present embodiment mainly is made of single-chip microcomputer, differential pressure transmitter, control circuit, power pack, indicating circuit, display screen, optoelectronic switch group, motor, motor drive module, gear drive, signal conditioning circuit, electrical ball valve, tubing string and casing.Solid arrow represents electrical connection among the figure, and dotted arrow represents the signal transmission relation.
Power circuit is supplied modules with 15V, the 5V and the 3.3V DC voltage that produce;
Single-chip microcomputer adopts the MSP430 family chip, and the model of this chip is MSP430F149;
Liquid crystal display circuit is used for display operation flow process and measurement result;
The LED indicating circuit is used to refer to instrument work correlation behavior;
Photoswitch circuit is processed the signal of two optoelectronic switch outputs, sends into single-chip microcomputer and processes;
Function selecting module is exported to demarcation, the measurement of water percentage and the resetting of system that single-chip microcomputer carries out pure water, pure oil by button, and push button signalling is sent into single-chip microcomputer and processed;
The differential pressure transmitter output signal conditioning circuit is used for measuring the differential pressure between the two tubing string liquid, and output current signal, modulate circuit become voltage with current conversion and send into single-chip microcomputer and detect;
Motor drive module is used to provide stepper motor and drives and the rotating signal, and the isolation of the photoelectricity of Single Chip Microcomputer (SCM) system and motor.
The measuring height system: the water in oil analyzer of present embodiment, can measure liquid level---purpose is to calculate U Water, U OilAnd U Crude oilAdopt the direct transmitted of single-chip microcomputer to the driven by servomotor module, drive servomotor work by driver module again, by gear drive, the optoelectronic switch group is moved up and down along threaded Metallic rod.When optoelectronic switch moved to the matrix liquid level of tubing string, the optoelectronic switch high-low level was changed, and signal is transferred to single-chip microcomputer, and single-chip microcomputer stops transmitted, and umber of pulse is at this moment preserved for high computational.Because pulse of the every transmission of single-chip microcomputer, servomotor rotates, gear drive once, on the optoelectronic switch group or under move a certain distance.Thus, can calculate the distance of optoelectronic switch group from initial point to liquid level, and then calculate the height of liquid level.Its liquid level value form with umber of pulse in water content in crude oil calculates participates in computing.
Water cut is calculated: two tubing string internal diameters are identical, and then the content of water in oil can be with highly calculating.In order to measure water content in crude oil, need to do the unit pulse voltage variety that 2 deutero-albumoses devise a stratagem is calculated pure oil in the unit pulse voltage variety of pure water in the crude oil and the crude oil.Isolate pure water and pure oil with local crude oil, fixed with pure water and pure oil ga(u)ge respectively, draw corresponding unit pulse voltage variety.Do measurement with crude oil and pure water at last, in like manner measure crude monoglyceride digit pulse voltage variety, single-chip microcomputer finally calculates water cut according to these 3 unit pulse voltage varieties, and finally is presented on the liquid crystal display.
The circular of water cut is as described in the summary of the invention of front.
Fig. 2 has shown the hardware configuration of present embodiment
Mainly be comprised of tubing string 1, tubing string 2, differential pressure transmitter, tubing string 1 links to each other with differential pressure transmitter is anodal, and tubing string 2 links to each other with the differential pressure transmitter negative pole.
Fig. 3 shown present embodiment workflow as follows
After the device energising, enter holding state, the scanning key circuit is to select corresponding function.Need to carry out initial alignment when instrument uses for the first time, sequentially for demarcating first pure water, next demarcates pure oil in demarcation, and last crude oil is measured.
Calibration process is as follows: pour pure water in tubing string 2, optoelectronic switch 2 monitoring minimum liquid levels, after liquid level reached, single-chip microcomputer carried out the AD conversion to the simulating signal of differential pressure transmitter output, pilot lamp 1 lights, and indicates pure water in the tubing string 2 or the pouring volume of pure oil surveying in the scope with this.Pour pure water into to tubing string 1 again, make its voltage within range ability, after finishing, by the button starter motor, motor rise to drive optoelectronic switch 1 and carries out the pure water level detection, determines liquid level with this, and pulse number and AD result will reach liquid level the time deposit respectively the single-chip microcomputer internal memory in.Measure for the first time liquid level and finish and carry out to an amount of pure water of tubing string 1 notes, making its voltage within range ability again after the resetting of motor, restart motor, motor rises and drives optoelectronic switch 1 and carry out the pure water level detection.The voltage number that gathers 2 subpulse numbers and 2 correspondences by 2 this measurements participates in single-chip microcomputer and calculates, and finishes pure water and demarcates.Pure oil ga(u)ge is fixed and the crude oil measuring method is the same, keeps tubing string 2 constant, and tubing string 1 is replaced to pure oil or crude oil.After measurement is finished, the water percentage result will be sent to display screen and show.
Concrete operations are as follows:
Pure water is demarcated: press ﹠ hold 2, begin to demarcate pure water, pour pure water into to tubing string 2, until pilot lamp 1 lights, begin to pour pure water into to tubing string 1 again, in voltage is presented at range ability, can stop water filling; Starter motor, optoelectronic switch begin to measure the umber of pulse of tubing string height, and measurement makes reset motor after finishing, again pour an amount of pure water into to tubing string 1, make voltage be presented in the range ability starter motor, optoelectronic switch begins to measure the umber of pulse of tubing string height, and measurement makes reset motor after finishing.Start electric-controlled ball valve, get rid of the pure water of tubing string 1, demarcate complete.
Pure oil ga(u)ge is fixed: press ﹠ hold 2, begin to demarcate pure oil, pour pure oil into to tubing string 1, until voltage is presented in the range ability, can stop to annotate pure oil; Starter motor, optoelectronic switch begin to measure the umber of pulse of tubing string height, measure the end rear motor and reset, again pour an amount of pure oil into to tubing string 1, make voltage be presented in the range ability starter motor, optoelectronic switch begins to measure the umber of pulse of tubing string height, and measurement makes reset motor after finishing.Start electric-controlled ball valve, get rid of the pure oil of tubing string 1, demarcate complete.
Crude oil is measured: click button 3, begin to measure crude oil, pour crude oil into to tubing string 1, until voltage is presented in the range ability, can stop to annotate crude oil; Starter motor, optoelectronic switch begin to measure the umber of pulse of tubing string height, measure the end rear motor and reset, again pour an amount of crude oil into to tubing string 1, make voltage be presented in the range ability starter motor, optoelectronic switch begins to measure the umber of pulse of tubing string height, and measurement makes reset motor after finishing.Start electric-controlled ball valve, get rid of the crude oil of tubing string 1, showing the screen display water content in crude oil.Measure complete.

Claims (2)

1. the differential pressure type water in oil analyzer has single-chip microcomputer, peripheral circuit, display screen; It is characterized in that: differential pressure transmitter, control circuit, power pack, indicating circuit, optoelectronic switch group, motor, motor drive module, gear drive, signal conditioning circuit, electrical ball valve and tubing string are arranged; Control circuit is electrically connected with single-chip microcomputer and electric-controlled ball valve; Single-chip microcomputer is electrically connected with peripheral circuit, differential pressure transmitter, display screen, optoelectronic switch group, motor drive module, signal conditioning circuit respectively; Power pack is electrically connected with display screen, differential pressure transmitter and signal conditioning circuit, single-chip microcomputer and peripheral circuit, control circuit, optoelectronic switch group, motor drive module and electric-controlled ball valve, for it power supply; Electric-controlled ball valve has 2, connects respectively 2 tubing strings, plays on-off action; Motor drive module instruction motor rotation, the motor-driven gear gear train, gear drive links to each other with the optoelectronic switch group, and it is vertically mobile to drive the optoelectronic switch group;
Described optoelectronic switch is two, and is parallel with one another, operation independent of one another;
Described optoelectronic switch group contains the optoelectronic switch that is fixed on this platform, and optoelectronic switch is vertically mobile with the optoelectronic switch group;
Described signal conditioning circuit mainly is made of resistance and signal barrier assembly.
2. the measuring method of described differential pressure type water in oil analyzer according to claim 1 is characterized in that, is undertaken by following method step:
1) pure water of separating in the crude oil is demarcated
Annotate pure water in 2 tubing strings, liquid level must be higher than the optoelectronic switch reference plane, and both highly do not wait; By control circuit operation instrument, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 1While single-chip microcomputer collection signal modulate circuit data U 1In tubing string 1, pour an amount of pure water into again behind the reset motor, starter motor again, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 2While single-chip microcomputer collection signal modulate circuit data U 2Because U value and N value are linear, single-chip microcomputer calculates: U according to both data Water=(U 2-U 1)/(N 2-N 1);
2) fixed to the pure oil ga(u)ge of separating in the crude oil
Water in the tubing string 2 is constant, and the pure water in the tubing string 1 is replaced to pure oil, and liquid level must be higher than the optoelectronic switch reference plane; By control circuit operation instrument, it is N that the optoelectronic switch group moves the umber of pulse that records tubing string 1 liquid level 3, while single-chip microcomputer collection signal modulate circuit data U 3In tubing string 1, pour an amount of pure oil into again behind the reset motor, starter motor again, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 4While single-chip microcomputer collection signal modulate circuit data U 4Because U value and N value are linear, single-chip microcomputer calculates: U according to both data Oil=(U 4-U 3)/(N 4-N 3);
3) crude oil is carried out moisture measurement
Water in the tubing string 2 is constant, and the pure oil of tubing string 1 is replaced to crude oil, and liquid level must be higher than the optoelectronic switch reference plane; By control circuit operation instrument, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 5While single-chip microcomputer collection signal modulate circuit data U 5In tubing string 1, pour an amount of crude oil into again behind the reset motor, starter motor again, the optoelectronic switch group moves the umber of pulse N that records tubing string 1 liquid level 6While single-chip microcomputer collection signal modulate circuit data U 6Because U value and N value are linear, single-chip microcomputer calculates: U according to both data Crude oil=(U 6-U 5)/(N 6-N 5);
4) single-chip microcomputer is according to U Water, U OilAnd U Crude oil, calculate water content in crude oil:
Water content in crude oil=(U Crude oil-U Oil)/(U Water-U Oil) * 100%.
CN2012103626944A 2012-09-26 2012-09-26 Differential pressure type crude oil water cut analyzer and measuring method thereof Pending CN102998359A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106018172A (en) * 2016-05-24 2016-10-12 南通市飞宇石油科技开发有限公司 Method and apparatus for online detecting water and oil content in petroleum
CN108034447A (en) * 2017-11-30 2018-05-15 武汉工程大学 A kind of crude oil gravitational settling tank arrangement and its crude oil sedimentation method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0310827B2 (en) * 1988-03-16 1991-02-14 Mitsuboshi Belting Ltd
JP3010827B2 (en) * 1991-09-25 2000-02-21 日産自動車株式会社 Oil moisture detector
JP2002286666A (en) * 2001-03-28 2002-10-03 Mitsubishi Electric Corp Moisture content sensor
WO2005069021A1 (en) * 2004-01-05 2005-07-28 Anderson Scott K Permittivity monitor uses ultra wide band transmission
CN201130177Y (en) * 2007-12-18 2008-10-08 寿焕根 Double-differential pressure type water content meter
CN201532391U (en) * 2009-11-10 2010-07-21 任长庆 Measuring analyzer for water contained in crude oil
CN201538122U (en) * 2009-08-29 2010-08-04 谢小芳 Environment-protecting notepaper

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0310827B2 (en) * 1988-03-16 1991-02-14 Mitsuboshi Belting Ltd
JP3010827B2 (en) * 1991-09-25 2000-02-21 日産自動車株式会社 Oil moisture detector
JP2002286666A (en) * 2001-03-28 2002-10-03 Mitsubishi Electric Corp Moisture content sensor
WO2005069021A1 (en) * 2004-01-05 2005-07-28 Anderson Scott K Permittivity monitor uses ultra wide band transmission
CN201130177Y (en) * 2007-12-18 2008-10-08 寿焕根 Double-differential pressure type water content meter
CN201538122U (en) * 2009-08-29 2010-08-04 谢小芳 Environment-protecting notepaper
CN201532391U (en) * 2009-11-10 2010-07-21 任长庆 Measuring analyzer for water contained in crude oil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106018172A (en) * 2016-05-24 2016-10-12 南通市飞宇石油科技开发有限公司 Method and apparatus for online detecting water and oil content in petroleum
CN106018172B (en) * 2016-05-24 2019-06-21 南通市飞宇石油科技开发有限公司 A kind of device for on-line checking Water Content in Oil oil content
CN108034447A (en) * 2017-11-30 2018-05-15 武汉工程大学 A kind of crude oil gravitational settling tank arrangement and its crude oil sedimentation method

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