CN109708997A - A kind of device and method of detection viscous crude starting pressure - Google Patents
A kind of device and method of detection viscous crude starting pressure Download PDFInfo
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- CN109708997A CN109708997A CN201910129249.5A CN201910129249A CN109708997A CN 109708997 A CN109708997 A CN 109708997A CN 201910129249 A CN201910129249 A CN 201910129249A CN 109708997 A CN109708997 A CN 109708997A
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- pressure
- resistance
- starting pressure
- viscous crude
- voltage signal
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Abstract
The present invention discloses a kind of device of detection viscous crude starting pressure, including inlet port pressure detector, further includes by stress section Rx as the Wheatstone bridge of testing resistance, filter amplification circuit, data collecting card and data collection station；The inlet port pressure detector is installed on core entry end, the stress section Rx is installed on the endface of rock core outlet end, the Wheatstone bridge is electrically connected by the filter amplification circuit with the data collecting card, the data collection station is electrically connected with the data collecting card, and the data collection station is also electrically connected with the inlet port pressure detector.The present invention can accurately capture the moment that fluid flows in rock core, to improve the measurement accuracy of starting pressure.
Description
Technical field
The present invention relates to viscous crude to start technical field of pressure detection, and in particular to a kind of device of detection viscous crude starting pressure
And method.
Background technique
Viscous crude is because its viscosity is high, the characteristic of poor fluidity and non-newtonian fluid, seepage characteristic in porous media and often
It is different to advise crude oil, shows non linear fluid flow through porous medium rule, generally there are starting pressure gradients, i.e., feelings too small in displacement pressure gradient
It can not be flowed under condition, only when displacement pressure gradient is higher than starting pressure gradient, viscous crude can just start to flow, and percolation law
Deviate darcy flow, therefore the research of viscous crude starting pressure gradient is helped further to deepen, viscous crude percolation law is recognized
Know, provides theories integration to scientific and effective and Efficient Development heavy crude reservoir.The existing skill about measurement viscous crude starting pressure gradient
The problem of art be in rock core fluid flowing moment be difficult to determine, currently with method be capillary liquid level monitoring, should
Method is mainly to monitor the mobile moment of rock core outlet end capillary liquid level, however, being with the naked eye directly to observe, or utilize
High-resolution camera prison is clapped, and liquid level mobile moment is all difficult directly monitoring and arrives, so that biggish shadow can be generated to measurement result
It rings, while reducing conventional efficient.
Summary of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, a kind of device of detection viscous crude starting pressure is provided, is solved
Fluid flowing moment is difficult to determining technical problem in rock core in the prior art.
To reach above-mentioned technical purpose, technical solution of the present invention provides a kind of device of detection viscous crude starting pressure, packet
Inlet port pressure detector is included, further includes by stress section Rx as the Wheatstone bridge of testing resistance, filter amplification circuit, data
Capture card and data collection station；
The inlet port pressure detector is installed on core entry end, and the pressure value for detecting core entry end；
The stress section Rx is installed on the endface of rock core outlet end, and the flow signals for detecting fluid in rock core,
The Wheatstone bridge is used to the flow signals being converted to voltage signal；
The filter amplification circuit is electrically connected with the Wheatstone bridge, and is put for being filtered to the voltage signal
Greatly；
The data collecting card is electrically connected with the filter amplification circuit, and is turned for carrying out modulus to the voltage signal
It changes；
The data collection station is electrically connected with the data collecting card, and generates opening for the voltage signal for capturing
The dynamic moment；
The data collection station is also electrically connected with the inlet port pressure detector, and when for obtaining with the starting
The pressure value at corresponding core entry end is carved as starting pressure.
The present invention also provides a kind of methods of detection viscous crude starting pressure, comprising the following steps:
Step S1, the pressure value at core entry end is detected；
Step S2, the flow signals of fluid in rock core are detected by stress section Rx, and the flow signals are converted into electricity
Press signal；
Step S3, amplification and analog-to-digital conversion are filtered to the voltage signal；
Step S4, capture generates the Startup time of the voltage signal, obtains rock core corresponding with the Startup time and enters
The pressure value at mouth end is as starting pressure.
Compared with prior art, the beneficial effect comprise that the present invention places stress in the end face of rock core outlet end
Piece, to detect the tiny signal that fluid flowing moment generates in rock core, thus reach the corresponding starting pressure in core entry end,
It detects easy to operate, and Startup time can be accurately captured, so that obtained starting pressure is more accurate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the device of detection viscous crude starting pressure provided by the invention；
Fig. 2 is the circuit diagram of the Wheatstone bridge of the device of detection viscous crude starting pressure provided by the invention；
Fig. 3 is the flow chart of the method for detection viscous crude starting pressure provided by the invention.
Appended drawing reference:
1, inlet port pressure detector, 21, Wheatstone bridge, 22, filter amplification circuit, 23, data collecting card, 24, number
According to acquisition terminal, 10, rock core, 20, core holding unit.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment 1:
As shown in Figure 1, the embodiment of the present invention 1 provides a kind of device of detection viscous crude starting pressure, including arrival end
Pressure detector 1 further includes being adopted by stress section Rx as the Wheatstone bridge 21 of testing resistance, filter amplification circuit 22, data
Truck 23 and data collection station 24；
The inlet port pressure detector 1 is installed on core entry end, and the pressure value for detecting core entry end；
The stress section Rx is installed on the endface of rock core outlet end, and the flow signals for detecting fluid in rock core,
The Wheatstone bridge 21 is used to the flow signals being converted to voltage signal；
The filter amplification circuit 22 is electrically connected with the Wheatstone bridge 21, and for filtering to the voltage signal
Wave amplification；
The data collecting card 23 is electrically connected with the filter amplification circuit 22, and for carrying out mould to the voltage signal
Number conversion；
The data collection station 24 is electrically connected with the data collecting card 23, and generates the voltage signal for capturing
Startup time；
The data collection station 24 is also electrically connected with the inlet port pressure detector 1, and is opened for obtaining with described
The pressure value at dynamic moment corresponding core entry end is as starting pressure.
Flow signals of the stress section Rx mainly for detection of fluid flowing moment in rock core 10, the interior stream of rock core 10 in the present apparatus
When body does not flow, for stress section Rx there is no deformation, 21 output voltage of Wheatstone bridge is 0, i.e., when in rock core 10 fluid open
Begin flowing when, 10 exit end face fluid of rock core will extrusion stress piece Rx generate certain miniature deformation, and pass through favour stone electricity
The deformation quantity of stress section Rx is converted to voltage signal by bridge 21.Since the signal of fluid flowing moment is very faint and can generate big
Measure high-frequency noise, it is therefore desirable to connect a filter amplification circuit 22, the voltage signal acquired to Wheatstone bridge 21 is filtered
Wave removes high-frequency noise, and amplifies to faint voltage signal.Acting on for data collecting card 23 is the voltage that will be simulated
Signal carries out analog-to-digital conversion, and the voltage signal of the number after conversion is then conveyed to data collection station 24.Data collecting card
23 are realized using data collecting card 23 in the prior art, and the data collecting card 23 that the present embodiment uses is the NI- of NI company
MyDAQ capture card.Data collection station 24 is used to carry out signal processing to voltage signal, and captures the voltage signal of flowing moment
Corresponding Startup time, signal processing can be realized by upper computer software in the prior art, such as labview software.
It should be noted that stress section Rx is not mounted on 20 outlet end of core holding unit in the present invention, but it is bonded installation
In 10 outlet end end face of rock core, the flowing of fluid can be more directly detected in this way, improve detection accuracy.
The invention has the following advantages that the invention is the signal that fluid flowing moment generates in direct monitoring rock core 10, rock
For fluid once movement, the fluid of 10 exit end face of rock core, which squeezes foil gauge, generates miniature deformation in the heart 10, once it is tangible
Become, the voltage signal of output will change, and then can determine rock core by the output signal of data collecting card 23
The corresponding starting pressure value of 10 arrival ends, this method avoid clap rock core due to direct visual perception or high-precision video camera prison
Error caused by 10 outlet end liquid levels mobile moment, in addition, since foil gauge is placed directly against 10 exit end face of rock core, this
Sample can more directly detect fluid flowing moment in rock core 10, avoid because of 10 exit end face of rock core to rock core
Fluid compression bring error in 20 outlet end pipeline of clamper.Therefore the invention can largely reduce detection error, together
When improve detection efficiency.
Preferably, as shown in Fig. 2, the favour Stone circuit includes resistance R1, resistance R2, resistance R3 and the stress section
Rx；
The resistance R1 and the resistance R2 are series between the positive electrode and negative electrode of power supply VCC, and form the first branch, institute
State it is in parallel with the first branch after resistance R3 connects with the stress section Rx, the common end of the resistance R1 and resistance R2 and
The resistance R3 is electrically connected with the filter amplification circuit 22 respectively with the common end of the stress section Rx.
Stress section Rx can generate deformation when there is fluid flowing, so that the resistance value of stress section Rx changes.Hui Si
Output is 0V when energization bridge 21 balances, and when the resistance value of stress section Rx changes, the balance of Wheatstone bridge 21 is affected, output electricity
Pressure also just changes correspondingly, and the present invention is exactly the essence for applying the characteristic of stress section Rx and Wheatstone bridge 21 to realize fluid flowing moment
True detection and capture.
Preferably, the inlet port pressure detector 1 is capillary fluid column, and the data collection station 24 is for establishing institute
The height value of capillary fluid column and the relation curve of time are stated, and determines that the Startup time is corresponding according to the relation curve
Liquid-column height value, and the starting pressure is calculated according to the liquid-column height value.
The present invention in addition to measurement viscous crude starting pressure gradient in rock core 10 in fluid flowing moment signal acquisition into
It has gone improvement, certain improvement is had also been made to the processing method of the starting pressure of 10 arrival end of rock core, i.e., in the detection process, note
Different moments corresponding liquid-column height is recorded, the relation curve of liquid-column height and time is drawn, finally according to fluid stream in rock core 10
The Startup time of moment is moved to determine corresponding liquid-column height value, starting pressure is finally calculated according to liquid-column height value.The present invention
Liquid-column height when determining that starting pressure occurs in rock core 10 by the method for liquid-column height value and time graph, this method not only may be used
To improve measurement accuracy, it can also reduce and transfer measurement entrance side pressure after fluid flowing twinkling signal due to receiving in rock core 10
The error generated when power because in the detection process several seconds time differences be likely to cause the variation of inlet port pressure, cause
Start pressure and generates larger detection error.
Preferably, the data collection station 24 is computer.
It is easy to operate using computer as data collection station 24.
Specifically, data collection station 24 is electrically connected by USB interface with data collection station 24, USB interface versatility
Height is suitable for different types of data collection station 24 and data collecting card 23.
Embodiment 2:
As shown in figure 3, the embodiment of the present invention 2 provides a kind of method of detection viscous crude starting pressure, including following step
It is rapid:
Step S1, the pressure value at core entry end is detected；
Step S2, the flow signals of fluid in rock core are detected by stress section Rx, and the flow signals are converted into electricity
Press signal；
Step S3, amplification and analog-to-digital conversion are filtered to the voltage signal；
Step S4, capture generates the Startup time of the voltage signal, obtains rock core corresponding with the Startup time and enters
The pressure value at mouth end is as starting pressure.
The method of detection viscous crude starting pressure provided by the invention, starts the device of pressure based on above-mentioned detection viscous crude, because
This, the method for the technical effect that the device of above-mentioned detection viscous crude starting pressure has, detection viscous crude starting pressure is likewise supplied with,
Details are not described herein.
Preferably, the step S4 specifically: the pressure value that core entry end is measured by capillary fluid column, described in foundation
The height value of capillary fluid column and the relation curve of time determine the corresponding fluid column of the Startup time according to the relation curve
Height value, and the starting pressure is calculated according to the liquid-column height value.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis
Any other various changes and modifications that technical concept of the invention is made should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (6)
1. a kind of device of detection viscous crude starting pressure, which is characterized in that further include by stress including inlet port pressure detector
Piece Rx is as the Wheatstone bridge of testing resistance, filter amplification circuit, data collecting card and data collection station；
The inlet port pressure detector is installed on core entry end, and the pressure value for detecting core entry end；
The stress section Rx is installed on the endface of rock core outlet end, and the flow signals for detecting fluid in rock core, described
Wheatstone bridge is used to the flow signals being converted to voltage signal；
The filter amplification circuit is electrically connected with the Wheatstone bridge, and for being filtered amplification to the voltage signal；
The data collecting card is electrically connected with the filter amplification circuit, and for carrying out analog-to-digital conversion to the voltage signal；
The data collection station is electrically connected with the data collecting card, and for when capturing the starting for generating the voltage signal
It carves；
The data collection station is also electrically connected with the inlet port pressure detector, and for obtaining and the Startup time pair
The pressure value at the core entry end answered is as starting pressure.
2. the device of detection viscous crude starting pressure according to claim 1, which is characterized in that the favour Stone circuit includes
Resistance R1, resistance R2, resistance R3 and the stress section Rx；
The resistance R1 and the resistance R2 are series between the positive electrode and negative electrode of power supply, and form the first branch, the resistance
R3 is in parallel with the first branch after connecting with the stress section Rx, the common end and the electricity of the resistance R1 and resistance R2
Resistance R3 is electrically connected with the filter amplification circuit respectively with the common end of the stress section Rx.
3. the device of detection viscous crude starting pressure according to claim 1, which is characterized in that the inlet port pressure detection
Device is capillary fluid column, and the data collection station is used to establish the height value and the relationship of time song of the capillary fluid column
Line, and the corresponding liquid-column height value of the Startup time is determined according to the relation curve, and according to the liquid-column height value meter
Calculate the starting pressure.
4. the device of detection viscous crude starting pressure according to claim 1, which is characterized in that the data collection station is
Computer.
5. a kind of method of detection viscous crude starting pressure, which comprises the following steps:
Step S1, the pressure value at core entry end is detected；
Step S2, the flow signals of fluid in rock core are detected by stress section Rx, and the flow signals are converted into voltage letter
Number；
Step S3, amplification and analog-to-digital conversion are filtered to the voltage signal；
Step S4, capture generates the Startup time of the voltage signal, obtains core entry corresponding with Startup time end
Pressure value as starting pressure.
6. the method for detection viscous crude starting pressure according to claim 5, which is characterized in that the step S4 specifically:
The pressure value that core entry end is measured by capillary fluid column, height value and the relationship of time for establishing the capillary fluid column are bent
Line determines the corresponding liquid-column height value of the Startup time according to the relation curve, and is calculated according to the liquid-column height value
The starting pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129249.5A CN109708997B (en) | 2019-02-21 | 2019-02-21 | Device and method for detecting starting pressure of thickened oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129249.5A CN109708997B (en) | 2019-02-21 | 2019-02-21 | Device and method for detecting starting pressure of thickened oil |
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| Publication Number | Publication Date |
|---|---|
| CN109708997A true CN109708997A (en) | 2019-05-03 |
| CN109708997B CN109708997B (en) | 2020-06-26 |
Family
ID=66263812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910129249.5A Active CN109708997B (en) | 2019-02-21 | 2019-02-21 | Device and method for detecting starting pressure of thickened oil |
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Citations (6)
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| DE20023750U1 (en) * | 2000-02-14 | 2006-04-27 | Suchy, Slawomir | Measurement method for viscosity and shear stress of fluid, involves calculating viscosity and shear stress of fluid from performance curve and power consumption of flow through device |
| CN101551276A (en) * | 2009-04-30 | 2009-10-07 | 武汉高德红外股份有限公司 | New type infrared read-out circuit based on wheatstone bridge |
| CN104237098A (en) * | 2013-06-21 | 2014-12-24 | 长江大学 | Method for measuring gradient of rock starting pressure |
| CN105738252A (en) * | 2016-01-28 | 2016-07-06 | 中国海洋石油总公司 | Measurement method of flowable opening degree limit of thickened oil in cracks |
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| CN108181209A (en) * | 2018-01-08 | 2018-06-19 | 中国海洋石油集团有限公司 | A kind of heavy crude reservoir fluid starting pressure gradient measuring device |
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2019
- 2019-02-21 CN CN201910129249.5A patent/CN109708997B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20023750U1 (en) * | 2000-02-14 | 2006-04-27 | Suchy, Slawomir | Measurement method for viscosity and shear stress of fluid, involves calculating viscosity and shear stress of fluid from performance curve and power consumption of flow through device |
| CN101551276A (en) * | 2009-04-30 | 2009-10-07 | 武汉高德红外股份有限公司 | New type infrared read-out circuit based on wheatstone bridge |
| CN104237098A (en) * | 2013-06-21 | 2014-12-24 | 长江大学 | Method for measuring gradient of rock starting pressure |
| CN105738252A (en) * | 2016-01-28 | 2016-07-06 | 中国海洋石油总公司 | Measurement method of flowable opening degree limit of thickened oil in cracks |
| CN107356364A (en) * | 2017-06-26 | 2017-11-17 | 中国石油大学(北京) | The measurement apparatus and method of compact rock core free-boundary problem |
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