CN109708997B - Device and method for detecting starting pressure of thickened oil - Google Patents
Device and method for detecting starting pressure of thickened oil Download PDFInfo
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- CN109708997B CN109708997B CN201910129249.5A CN201910129249A CN109708997B CN 109708997 B CN109708997 B CN 109708997B CN 201910129249 A CN201910129249 A CN 201910129249A CN 109708997 B CN109708997 B CN 109708997B
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Abstract
The invention discloses a device for detecting the starting pressure of thickened oil, which comprises an inlet end pressure detector, a Wheatstone bridge with a stress sheet Rx as a resistor to be detected, a filtering amplification circuit, a data acquisition card and a data acquisition terminal, wherein the stress sheet Rx is used as the resistor to be detected; the inlet end pressure detector is arranged at the inlet end of the rock core, the stress sheet Rx is arranged at the end face of the outlet end of the rock core, the Wheatstone bridge is electrically connected with the data acquisition card through the filter amplification circuit, the data acquisition terminal is electrically connected with the data acquisition card, and the data acquisition terminal is also electrically connected with the inlet end pressure detector. The invention can accurately capture the flowing moment of the fluid in the core, thereby improving the measurement precision of the starting pressure.
Description
Technical Field
The invention relates to the technical field of thick oil starting pressure detection, in particular to a device and a method for detecting thick oil starting pressure.
Background
The viscous oil has high viscosity, poor fluidity and the characteristic of non-Newtonian fluid, the seepage characteristic in a porous medium is different from that of the conventional crude oil, the non-linear seepage rule is shown, a starting pressure gradient generally exists, namely the viscous oil cannot flow under the condition that the displacement pressure gradient is too small, the viscous oil starts to flow only when the displacement pressure gradient is higher than the starting pressure gradient, and the seepage rule deviates from Darcy seepage, so that the research on the starting pressure gradient of the viscous oil is beneficial to further deepening the understanding on the viscous oil seepage rule, and the theoretical support is provided for scientifically, effectively and efficiently developing a viscous oil reservoir. The existing technology for measuring the starting pressure gradient of the thickened oil has the problem that the flowing moment of fluid in a rock core is difficult to determine, the method which is utilized at present is capillary liquid level monitoring, the method mainly monitors the moving moment of the liquid level of a capillary at the outlet end of the rock core, and the moving moment of the liquid level is difficult to monitor visually no matter the liquid level is directly observed by naked eyes or monitored by a high-resolution camera, so that the measuring result is greatly influenced, and the experimental efficiency is reduced.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a device for detecting the starting pressure of thick oil, which solves the technical problem that the flowing moment of fluid in a rock core is difficult to determine in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides a device for detecting the starting pressure of thickened oil, which comprises an inlet end pressure detector, a Wheatstone bridge with a stress sheet Rx as a resistor to be detected, a filter amplification circuit, a data acquisition card and a data acquisition terminal, wherein the stress sheet Rx is used as the resistor to be detected;
the inlet end pressure detector is arranged at the inlet end of the rock core and is used for detecting the pressure value at the inlet end of the rock core;
the stress sheet Rx is arranged on the end face of the outlet end of the rock core and used for detecting a flowing signal of fluid in the rock core, and the Wheatstone bridge is used for converting the flowing signal into a voltage signal;
the filter amplifying circuit is electrically connected with the Wheatstone bridge and is used for filtering and amplifying the voltage signal;
the data acquisition card is electrically connected with the filtering and amplifying circuit and is used for carrying out analog-to-digital conversion on the voltage signal;
the data acquisition terminal is electrically connected with the data acquisition card and is used for capturing the starting moment of generating the voltage signal;
and the data acquisition terminal is also electrically connected with the inlet end pressure detector and is used for acquiring a pressure value of the core inlet end corresponding to the starting moment as a starting pressure.
The invention also provides a method for detecting the starting pressure of the thickened oil, which comprises the following steps:
step S1, detecting a pressure value of the inlet end of the rock core;
step S2, detecting a flow signal of the fluid in the rock core through a stress sheet Rx, and converting the flow signal into a voltage signal;
step S3, performing filtering amplification and analog-to-digital conversion on the voltage signal;
and step S4, capturing the starting time of the voltage signal, and acquiring the pressure value of the inlet end of the core corresponding to the starting time as the starting pressure.
Compared with the prior art, the invention has the beneficial effects that: the stress sheet is arranged on the end face of the outlet end of the rock core and used for detecting a micro signal generated at the moment of fluid flowing in the rock core, so that the starting pressure corresponding to the inlet end of the rock core is achieved, the detection operation is simple, the starting time can be accurately captured, and the obtained starting pressure is more accurate.
Drawings
FIG. 1 is a schematic structural diagram of a device for detecting the starting pressure of thick oil provided by the invention;
FIG. 2 is a circuit diagram of a Wheatstone bridge of the device for detecting the starting pressure of the thick oil provided by the invention;
fig. 3 is a flowchart of a method for detecting a starting pressure of thick oil according to the present invention.
Reference numerals:
1. the device comprises an inlet end pressure detector 21, a Wheatstone bridge 22, a filter amplifying circuit 23, data acquisition cards 24, a data acquisition terminal 10, a rock core 20 and a rock core holder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a device for detecting a starting pressure of thick oil, including an inlet end pressure detector 1, a wheatstone bridge 21 using a stress sheet Rx as a resistor to be detected, a filter amplifier circuit 22, a data acquisition card 23, and a data acquisition terminal 24;
the inlet end pressure detector 1 is arranged at the inlet end of the rock core and is used for detecting the pressure value of the inlet end of the rock core;
the stress sheet Rx is arranged on the end face of the outlet end of the rock core and used for detecting a flowing signal of fluid in the rock core, and the Wheatstone bridge 21 is used for converting the flowing signal into a voltage signal;
the filter amplifying circuit 22 is electrically connected with the wheatstone bridge 21 and is used for filtering and amplifying the voltage signal;
the data acquisition card 23 is electrically connected with the filtering and amplifying circuit 22 and is used for performing analog-to-digital conversion on the voltage signal;
the data acquisition terminal 24 is electrically connected with the data acquisition card 23 and is used for capturing the starting time of generating the voltage signal;
the data acquisition terminal 24 is also electrically connected to the inlet end pressure detector 1, and is configured to obtain a pressure value at the inlet end of the core corresponding to the start time as a start pressure.
Stress piece Rx in this device mainly is used for detecting the instantaneous flow signal of fluid flow in rock core 10, and when fluid does not flow in rock core 10, stress piece Rx does not take place deformation, and Wheatstone bridge 21 output voltage is 0, and when fluid began to flow in rock core 10, rock core 10 export terminal surface fluid will extrude stress piece Rx and produce certain micro deformation to change the deformation volume of stress piece Rx into voltage signal through Wheatstone bridge 21. Because the signal at the moment of fluid flowing is very weak and generates a large amount of high-frequency noise, a filter amplifier circuit 22 is required to be connected to filter and remove the high-frequency noise from the voltage signal collected by the wheatstone bridge 21 and amplify the weak voltage signal. The data acquisition card 23 is operative to perform analog-to-digital conversion on the analog voltage signal and then to transmit the converted digital voltage signal to the data acquisition terminal 24. The data acquisition card 23 is implemented by using the data acquisition card 23 in the prior art, and the data acquisition card 23 used in this embodiment is an NI-myDAQ acquisition card of NI corporation. The data acquisition terminal 24 is used for performing signal processing on the voltage signal and capturing the starting time corresponding to the voltage signal at the flowing moment, and the signal processing process can be realized by upper computer software in the prior art, such as labview software.
It should be noted that the stress sheet Rx is not installed at the outlet end of the core holder 20, but is installed on the end face of the outlet end of the core 10 in a fitting manner, so that the flow of fluid can be detected more directly, and the detection accuracy is improved.
The invention has the following advantages: according to the method, signals generated in the flowing moment of the fluid in the rock core 10 are directly monitored, once the fluid in the rock core 10 starts to move, the fluid on the end face of the outlet of the rock core 10 is extruded to generate micro deformation, once the fluid is deformed, the output voltage signals change, and then the corresponding starting pressure value at the inlet end of the rock core 10 can be determined through the output signals of the data acquisition card 23. Therefore, the invention can reduce the detection error to a great extent and improve the detection efficiency at the same time.
Preferably, as shown in fig. 2, the wheatstone circuit includes a resistor R1, a resistor R2, a resistor R3, and the stress patch Rx;
resistance R1 with resistance R2 establishes ties between the positive pole and the negative pole of power VCC to form first branch road, resistance R3 with stress piece Rx establishes ties after with first branch road is parallelly connected, resistance R1 and resistance R2's common port and resistance R3 with stress piece Rx's common port respectively with filtering amplifier circuit 22 electricity is connected.
When fluid flows, the stress sheet Rx deforms, so that the resistance value of the stress sheet Rx changes. The output of the Wheatstone bridge 21 is 0V when balanced, when the resistance value of the stress sheet Rx changes, the Wheatstone bridge 21 balance is affected, the output voltage changes accordingly, and the invention realizes the accurate detection and capture of the fluid flow moment by applying the characteristics of the stress sheet Rx and the Wheatstone bridge 21.
Preferably, the inlet end pressure detector 1 is a capillary liquid column, and the data acquisition terminal 24 is configured to establish a relation curve between a height value of the capillary liquid column and time, determine a liquid column height value corresponding to the starting time according to the relation curve, and calculate the starting pressure according to the liquid column height value.
The method improves the signal acquisition of the fluid flowing moment in the rock core 10 in the thick oil starting pressure gradient measurement, and also improves the processing method of the starting pressure at the inlet end of the rock core 10 to a certain extent, namely recording the corresponding liquid column heights at different moments in the detection process, drawing a relation curve of the liquid column heights and time, finally determining the corresponding liquid column height values according to the starting moment of the fluid flowing moment in the rock core 10, and finally calculating the starting pressure according to the liquid column height values. The method determines the height of the liquid column when the starting pressure occurs in the rock core 10 by a method of the height value of the liquid column and a time curve, not only can improve the measurement precision, but also can reduce the error generated when the pressure of the inlet end is measured after receiving the instantaneous flow signal of the fluid in the rock core 10, and the starting pressure generates larger detection error because the pressure of the inlet end is changed possibly due to the time difference of several seconds in the detection process.
Preferably, the data acquisition terminal 24 is a computer.
And a computer is used as the data acquisition terminal 24, so that the operation is simple.
Specifically, the data acquisition terminal 24 is electrically connected to the data acquisition terminal 24 through a USB interface, which has high versatility and is suitable for different types of data acquisition terminals 24 and data acquisition cards 23.
Example 2:
as shown in fig. 3, embodiment 2 of the present invention provides a method for detecting a starting pressure of thick oil, including the steps of:
step S1, detecting a pressure value of the inlet end of the rock core;
step S2, detecting a flow signal of the fluid in the rock core through a stress sheet Rx, and converting the flow signal into a voltage signal;
step S3, performing filtering amplification and analog-to-digital conversion on the voltage signal;
and step S4, capturing the starting time of the voltage signal, and acquiring the pressure value of the inlet end of the core corresponding to the starting time as the starting pressure.
The method for detecting the starting pressure of the thickened oil is based on the device for detecting the starting pressure of the thickened oil, so that the technical effect of the device for detecting the starting pressure of the thickened oil is the same as that of the method for detecting the starting pressure of the thickened oil, and the description is omitted.
Preferably, the step S4 specifically includes: measuring the pressure value at the inlet end of the rock core through a capillary liquid column, establishing a relation curve of the height value of the capillary liquid column and time, determining the liquid column height value corresponding to the starting moment according to the relation curve, and calculating the starting pressure according to the liquid column height value.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (4)
1. A device for detecting the starting pressure of thickened oil is characterized by comprising an inlet end pressure detector, a Wheatstone bridge with a stress sheet Rx as a resistor to be detected, a filtering amplification circuit, a data acquisition card and a data acquisition terminal, wherein the stress sheet Rx is used as the resistor to be detected;
the inlet end pressure detector is arranged at the inlet end of the rock core and is used for detecting the pressure value at the inlet end of the rock core;
the stress sheet Rx is arranged on the end face of the outlet end of the rock core and used for detecting a flowing signal of fluid in the rock core, and the Wheatstone bridge is used for converting the flowing signal into a voltage signal;
the filter amplifying circuit is electrically connected with the Wheatstone bridge and is used for filtering and amplifying the voltage signal;
the data acquisition card is electrically connected with the filtering and amplifying circuit and is used for carrying out analog-to-digital conversion on the voltage signal;
the data acquisition terminal is electrically connected with the data acquisition card and is used for capturing the starting moment of generating the voltage signal;
the data acquisition terminal is also electrically connected with the inlet end pressure detector and is used for acquiring a pressure value of the inlet end of the rock core corresponding to the starting moment as a starting pressure;
the inlet end pressure detector is a capillary liquid column, the data acquisition terminal is used for establishing a relation curve of the height value of the capillary liquid column and time, determining the liquid column height value corresponding to the starting moment according to the relation curve, and calculating the starting pressure according to the liquid column height value.
2. The device for detecting the thick oil starting pressure as claimed in claim 1, wherein the wheatstone circuit comprises a resistor R1, a resistor R2, a resistor R3 and the stress sheet Rx;
the resistor R1 and the resistor R2 are connected in series between the positive electrode and the negative electrode of a power supply and form a first branch circuit, the resistor R3 is connected in series with the stress sheet Rx and then connected in parallel with the first branch circuit, and the common end of the resistor R1 and the resistor R2 and the common end of the resistor R3 and the stress sheet Rx are respectively and electrically connected with the filter amplifying circuit.
3. The device for detecting the starting pressure of the thick oil as claimed in claim 1, wherein the data acquisition terminal is a computer.
4. A method for detecting the starting pressure of thick oil is characterized by comprising the following steps:
step S1, detecting a pressure value of the inlet end of the rock core;
step S2, detecting a flow signal of fluid in the rock core through a stress sheet Rx arranged on the end face of the outlet end of the rock core, and converting the flow signal into a voltage signal;
step S3, performing filtering amplification and analog-to-digital conversion on the voltage signal;
step S4, capturing the starting time of the voltage signal, and acquiring a pressure value of the inlet end of the rock core corresponding to the starting time as a starting pressure;
the step S4 specifically includes: measuring the pressure value at the inlet end of the rock core through a capillary liquid column arranged at the inlet end of the rock core, establishing a relation curve of the height value of the capillary liquid column and time, determining the liquid column height value corresponding to the starting time according to the relation curve, and calculating the starting pressure according to the liquid column height value.
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| CN201910129249.5A CN109708997B (en) | 2019-02-21 | 2019-02-21 | Device and method for detecting starting pressure of thickened oil |
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| CN201910129249.5A CN109708997B (en) | 2019-02-21 | 2019-02-21 | Device and method for detecting starting pressure of thickened oil |
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| CN109708997A CN109708997A (en) | 2019-05-03 |
| CN109708997B true CN109708997B (en) | 2020-06-26 |
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| 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 |
| 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
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Patent 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 |
| 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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| 基于压力传感器的智能液位监测装置;秦玉伟;《渭南师范学院学报》;20150131;第30卷(第12期);第39页 * |
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