CN105004639B - A kind of diffusible visual evaluating method of gel in rock microchannel - Google Patents
A kind of diffusible visual evaluating method of gel in rock microchannel Download PDFInfo
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Abstract
The present invention relates to a kind of diffusible visual evaluating method of gel in rock microchannel, belongs to petroleum works and improves recovery efficiency technique and experimental fluid mechanics field.The present invention is distributed using low-field nuclear magnetic resonance imaging technique research gel in microchannel, can directly observe distribution of the gel in porous media microchannel in rock core displacement test by nmr imaging technique and T2 spectral analysis technologies.Then gel images are extracted according to nuclear magnetic resonance image, obtains the parameters such as gel area, gel leading edge, gel trailing edge and gel center.Finally by the calculating to gel static state diffusion ratio and dynamic diffusion ratio, diffusivity of the quantitatively characterizing gel in rock core.The inventive method makes diffusion characteristic of the gel in porous media obtain more intuitively describing.
Description
Technical field
The present invention relates to a kind of diffusible visual evaluating method of gel in rock microchannel, belong to petroleum works
Improve recovery efficiency technique and experimental fluid mechanics field.
Background technology
Rock core displacement test is a kind of method of generally acknowledged research rock core fluid flow inside in laboratory, is widely used
In the field such as oil development and environmental science, but because rock core has not visible feature, flowing of the fluid in rock core can only be used
Pressure and flow two indices carry out indirect expression, or according to pressure --- discharge relation, entered in the ranks using method for numerical simulation
Connect sign.Low-field nuclear magnetic resonance is a new and high technology quickly grown in recent years, is had in medical treatment and food service industry
Application well.How to make in laboratory rock core displacement process more directly or even visual, turn into petroleum works technical field and exert
Try hard to pursue the target asked and the important process of development.Usually using the macropore in injection gel closure porous media in petroleum works
Road, the flow channel of regulation injection liquid, improves sweep area and oil displacement efficiency.But rock core flowing experiment traditional at present is led to
The macroparameter of end or border can only often be used（Such as outlet pressure, inlet pressure, flow velocity etc.）To describe or deduce stream
Flow condition and Flooding Efficiency of the body inside rock core.Rock core is equivalent to a black box for researcher, can not
Accurately understand its internal fluid motion situation.
The content of the invention
It is difficult the problem characterized for diffusivity of the current gel in rock core, it is an object of the invention to provide a kind of gel
Diffusible visual evaluating method in rock microchannel, by rock core flowing experiment and the organic knot of magnetic resonance detection technology
Altogether, diffusion characteristic of the gel in porous media is made to obtain more intuitively describing.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
A kind of diffusible visual evaluating method of gel in rock microchannel, comprises the following steps：
（1）Nuclear magnetic resonance equipment is opened, after the rock core of saturation water is put into magnet, rock core position is determined by NMR imaging
Put, be at magnetic field center；The slice thickness of rock core sagittal plane and cross section, slice spacings and slice position are set
Put, utilize fluid signal in rock microchannel in low-field nuclear magnetic resonance equipment acquisition rock core displacement test.
（2）Gray level image extracts.Gray level image passes through signal strength at diverse location inside bright dark sign rock core（Signal is got over
Qiang Yueliang, signal are more weak darker）.
（3）Area-of-interest（ROI）Extraction.Nuclear-magnetism image pick-up signal form be 100mm × 100mm form, rock core
Sagittal plane is 90mm × 25mm rectangle, and cross section is diameter 25mm circle, so needing to extract the effective coverage of gray level image.
（4）Unified mapping.Every nuclear magnetic resonance gray level image is bright dark according to the strong and weak display of its own signal, for more different figures
Signal strength in piece, it is necessary to the nuclear magnetic resonance picture of same section is carried out bright show slinkingly according to unified standard and shown.
（5）Extract rock core skeleton.To determine the skeleton structure of rock core, the nuclear-magnetism image of saturated core is carried out at binaryzation
Reason, separate rock core skeleton and fluid information.
（6）Addition is pseudo- color.To the rock core of gray scale after reunification, addition JET is pseudo- color, makes the differentiation of gel and water more obvious.
（7）Extract gel images.Gel images are extracted according to nuclear magnetic resonance image, gel area, gel leading edge is obtained, coagulates
The parameter such as glue trailing edge and gel center.
（8）Gel static state diffusion ratio characterizes：The water of the certain pore volume of displacement, using the area divided by time for waiting solidifying rear gel
Static diffusion ratio of the area of gel as gel, calculates the static diffusion ratio of each sagittal plane, then makes even first before solidifying
Average is designated as the static diffusion ratio of gel in whole rock core；
In formula：S1To wait solidifying preceding gel distribution area, mm2；S2Area, mm are blocked to wait solidifying rear gel2；K jSpread for static state
Than dimensionless.
（9）Gel dynamic diffusion ratio characterizes：The area of gel is after the area of gel divided by injection gel during water drive
The dynamic diffusion ratio of gel, the dynamic diffusion ratio of each sagittal plane is calculated first, then averages and is designated as in whole rock core
The dynamic diffusion ratio of gel；
In formula：S3For the area of gel during water drive, mm2；K dFor dynamic diffusion ratio, dimensionless.
（10）The diffusible change of gel is weighed by static diffusion ratio and dynamic diffusion ratio, static diffusion ratio and dynamic expand
Scattered ratio is bigger, illustrates that gel diffusivity is stronger；Static diffusion ratio and dynamic diffusion ratio are smaller, illustrate that gel diffusivity is poorer.
Size range the diameter 25mm, length 60mm ~ 180mm of the rock core.
The core permeability scope 500mD ~ 5000mD.
The step 8）The pressure limit of middle displacement is 0.01MPa ~ 20MPa.
The step 8）The changes in flow rate scope of middle displacement is 0.1ml/min ~ 5ml/min.
Compared with prior art, the present invention have substantive distinguishing features prominent as follows and it is notable the advantages of：
The present invention studies gel diffusivity in microchannel using low-field nuclear magnetic resonance imaging technique and characterized, and rock core is flowed
Experiment and magnetic resonance detection technology combine, and make diffusion characteristic of the gel in porous media obtain comparing intuitively
Description.
Brief description of the drawings
Fig. 1 is that gel diffusion ratio characterizes schematic diagram.
Fig. 2 is gel sagittal plane nuclear-magnetism distributed image in rock core.
Fig. 3 is gel diffusion ratio characterization result.
Fig. 4 is gel characteristic parameter table.
Embodiment
After now the specific embodiment of present invention combination accompanying drawing is described in.
A kind of diffusible visual evaluating method of the gel of the present embodiment in rock microchannel, testing procedure are：
（1）Nuclear magnetic resonance equipment is opened, after the rock core of saturation water is put into magnet, rock core position is determined by NMR imaging
Put, be at magnetic field center；0.7cm is arranged to the slice thickness of rock core sagittal plane and cross section, slice spacings are arranged to
0.1cm and slice position are configured, and are obtained using low-field nuclear magnetic resonance equipment in rock core displacement test in rock microchannel
Fluid signal；
（2）Gray level image extracts.Gray level image of the gel in rock core is extracted by nuclear magnetic resonance.
（3）Area-of-interest（ROI）Extraction.The rectangle for extracting 90mm × 25mm is the effective coverage of gray level image.
（4）Unified mapping.The scope of the unified mapping of all sagittal planes is 1 ~ 100000 zero dimension equivalent luminance unit.
（5）Extract rock core skeleton.Binary conversion treatment is carried out to the nuclear-magnetism image of saturated core, defines rock core skeleton and fluid
Separation threshold values be 15000 zero dimension equivalent luminance units.
（6）Addition is pseudo- color：To the rock core of gray scale after reunification, addition JET is pseudo- color, makes the differentiation of gel and water more obvious.
（7）Extract gel images.Gel images are extracted according to nuclear magnetic resonance image, extraction result is shown in Fig. 2.Obtain gel face
The parameter such as product, gel leading edge, gel trailing edge and gel center.Extraction result is shown in Fig. 4.
（8）Gel static state diffusion ratio characterizes：The water of the certain pore volume of displacement, using the area divided by note for waiting solidifying rear gel
Enter static diffusion ratio of the area of gel after gel as gel, calculate the static diffusion ratio of each sagittal plane, such as Fig. 1 first
It is shown, then average and be designated as the static diffusion ratio of gel in whole rock core, and result of calculation is drawn, mapping result is shown in attached
Fig. 3.
In formula：S1To wait solidifying preceding gel distribution area, mm2；S2Area, mm are blocked to wait solidifying rear gel2；K jSpread for static state
Than dimensionless.
（9）Gel dynamic diffusion ratio characterizes：The area of gel is after the area of gel divided by injection gel during water drive
The dynamic diffusion ratio of gel, the dynamic diffusion ratio of each sagittal plane is calculated first, then averages and is designated as in whole rock core
The dynamic diffusion ratio of gel, and result of calculation is drawn, mapping result is shown in accompanying drawing 3.
In formula：S3For the area of gel during water drive, mm2；K dFor dynamic diffusion ratio, dimensionless.
（10）By the sign of static diffusion ratio and dynamic diffusion ratio, it is big that gel dynamic diffusion ratio in migration process can be obtained
In static diffusion ratio.
Claims (5)
1. diffusible visual evaluating method of a kind of gel in rock microchannel, it is characterised in that comprise the following steps：
1）Nuclear magnetic resonance equipment is opened, after the rock core of saturation water is put into magnet, rock core position is determined by NMR imaging, makes it
In magnetic field center；The slice thickness of rock core sagittal plane and cross section, slice spacings and slice position are configured, utilization is low
Fluid signal in rock microchannel in field nuclear magnetic resonance equipment acquisition rock core displacement test；
2）Gray level image extracts：Gray level image is strong and weak by fluid signal at diverse location inside bright dark sign rock core, and signal is got over
Qiang Yueliang, signal are more weak darker；
3）Region of interesting extraction：In the effective coverage of nuclear-magnetism image pick-up signal form extraction gray level image, wherein nuclear-magnetism figure
As the form that collection signal windowses are 100mm × 100mm, wherein rock core sagittal plane is 90mm × 25mm rectangle, and cross section is
Diameter 25mm circle；
4）Unified mapping：The nuclear magnetic resonance picture of same section carries out bright show slinkingly according to unified standard and shown；
5）Extract rock core skeleton：Binary conversion treatment is carried out to the nuclear-magnetism image of saturated core, separates rock core skeleton and fluid information,
Determine the skeleton structure of rock core；
6）Addition is pseudo- color：To the rock core of gray scale after reunification, addition JET is pseudo- color, makes the differentiation of gel and water more obvious；
7）Extract gel images：Gel images are extracted according to nuclear magnetic resonance image, after obtaining gel area, gel leading edge, gel
Edge and gel center parameter；
8）Gel static state diffusion ratio characterizes：The water of the certain pore volume of displacement, using the distribution area divided by time for waiting solidifying rear gel
Static diffusion ratio of the distribution area of gel as gel before solidifying, the static diffusion ratio of each sagittal plane is calculated first, then
Average and be designated as the static diffusion ratio of gel in whole rock core；
In formula：S1 To wait the distribution area of solidifying preceding gel, mm2 ；S2 To wait the distribution area of solidifying rear gel, mm2 ；Kj For static state
Diffusion ratio, dimensionless；
9）Gel dynamic diffusion ratio characterizes：The distribution area of gel is solidifying before the distribution area of gel divided by time are solidifying during water drive
The dynamic diffusion ratio of glue, the dynamic diffusion ratio of each sagittal plane is calculated first, then average and be designated as coagulating in whole rock core
The dynamic diffusion ratio of glue；
In formula：S3 For the distribution area of gel during water drive, mm2 ；Kd For dynamic diffusion ratio, dimensionless；
10）The diffusible change of gel, static diffusion ratio and dynamic diffusion ratio are weighed by static diffusion ratio and dynamic diffusion ratio
It is bigger, illustrate that gel diffusivity is stronger；Static diffusion ratio and dynamic diffusion ratio are smaller, illustrate that gel diffusivity is poorer.
2. diffusible visual evaluating method of the gel according to claim 1 in rock microchannel, its feature exist
In size range the diameter 25mm, length 60mm ~ 180mm of the rock core.
3. diffusible visual evaluating method of the gel according to claim 1 in rock microchannel, its feature exist
In the core permeability scope 500mD ~ 5000mD.
4. diffusible visual evaluating method of the gel according to claim 1 in rock microchannel, its feature exist
In the step 8）The pressure limit of middle displacement is 0.01MPa ~ 20MPa.
5. diffusible visual evaluating method of the gel according to claim 1 in rock microchannel, its feature exist
In the step 8）The changes in flow rate scope of middle displacement is 0.1ml/min ~ 5ml/min.
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| CN113358683B (en) * | 2021-06-11 | 2022-04-12 | 西南石油大学 | Water flooding experimental device and method for researching core end face effect |
| CN114441375B (en) * | 2022-01-28 | 2024-05-24 | 中国石油大学(北京) | Carbonate model and carbonate chemical flooding performance test method |
| CN115728190A (en) * | 2022-11-29 | 2023-03-03 | 鲁东大学 | Grouting anchor rod cable slurry diffusion effect evaluation method based on three-dimensional imaging technology |
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