CN105004746B - A kind of visual evaluating method of seal-off effect of the gel in rock microchannel - Google Patents
A kind of visual evaluating method of seal-off effect of the gel in rock microchannel Download PDFInfo
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Abstract
The present invention relates to a kind of visual evaluating method of seal-off effect of gel in rock microchannel, belong to petroleum works and improve 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 gel block area than with closure height ratio calculating, seal-off effect of the quantitatively characterizing gel in rock core.The inventive method makes closure feature of the gel in porous media obtain more intuitively describing.
Description
Technical field
The present invention relates to a kind of visual evaluating method of seal-off effect 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, is 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, exerted as petroleum works technical field
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）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, it is impossible to
Accurately understand its internal fluid motion situation.
The content of the invention
It is difficult the problem characterized for seal-off effect of the current gel in rock core, it is an object of the invention to provide a kind of gel
The visual evaluating method of seal-off effect in rock microchannel, by rock core flowing experiment and the organic knot of magnetic resonance detection technology
Altogether, closure feature of the gel in porous media is made to obtain more intuitively describing.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that：
A kind of visual evaluating method of seal-off effect of gel in rock microchannel, comprises the following steps：
（1）Nuclear magnetic resonance equipment is opened, the rock core of saturation water is put into after 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 is extracted.Gray level image passes through signal strength at diverse location inside bright dark sign rock core（Signal is got over
Qiang Yueliang, signal is more weak darker）.
（3）Area-of-interest（ROI）Extract.Nuclear-magnetism image pick-up signal form is 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 its own signal power display, for relatively 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, separation 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 closure height is than characterizing：Gel blocks height in the vertical after the water of the certain pore volume of displacement, water drive
The ratio for blocking height in the vertical with waiting solidifying rear gel compares as gel closure height, and the envelope of each sagittal plane is calculated first
Stifled height compares, and then averages and is designated as the closure highly ratio of gel in whole rock core：
In formula：r1For the depth of section of rock core, mm；r2Height, mm are blocked for gel；F1Compare for closure height, dimensionless.
（9）Gel closure area is than characterizing：In step（8）In, at the same by gel after water drive in the horizontal gel area with
The gel that is used for of the hole gross area blocks area ratio；The closure area ratio in each cross section is calculated first, is then averaged
Value is designated as the closure area ratio of gel in whole rock core：
In formula：S1For the area of section of rock core, mm2；S2Area, mm are blocked for gel2；F2For closure area ratio, dimensionless.
（10）Compared and change of the closure area than weighing gel seal-off effect by blocking height：Closure height compares and closure face
Product illustrates that gel seal-off effect is stronger than bigger；Closure height ratio and block area ratio it is smaller, illustrate that gel seal-off effect is poorer.
The size range diameter 25mm of the rock core, length 60mm ~ 180mm.
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 has prominent substantive distinguishing features and significant advantage as follows：
The present invention studies gel seal-off effect 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 closure feature of the gel in porous media obtain comparing intuitively
Description.
Brief description of the drawings
Fig. 1 is that gel closure height compares schematic diagram.
Fig. 2 is that gel closure area compares schematic diagram.
Fig. 3 is gel sagittal plane nuclear-magnetism distributed image in rock core.
Fig. 4 is gel nuclear-magnetism distributed image in cross section in rock core.
Fig. 5 is that gel closure height compares characterization result.
Fig. 6 is that gel closure area compares characterization result.
Fig. 7 is gel characteristic parameter table.
Embodiment
After now the specific embodiment of present invention combination accompanying drawing is described in.
A kind of visual evaluating method of seal-off effect of the gel of the present embodiment in rock microchannel, testing procedure is：
（1）Nuclear magnetic resonance equipment is opened, the rock core of saturation water is put into after magnet, rock core position is determined by NMR imaging
Put, be at magnetic field center；0.7cm, slice spacings are set to the slice thickness of rock core sagittal plane and cross section to be set 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 is extracted.Gray level image of the gel in rock core is extracted by nuclear magnetic resonance.
（3）Area-of-interest（ROI）Extract.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, rock core skeleton and fluid is defined
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, result is extracted and sees Fig. 3 and Fig. 4.Obtain
The parameters such as gel area, gel leading edge, gel trailing edge and gel center.Extract result and see Fig. 7.
（8）Gel closure height is than characterizing：Gel blocks height in the vertical after the water of the certain pore volume of displacement, water drive
The ratio for blocking height in the vertical with waiting solidifying rear gel compares as gel closure height, as shown in figure 1, calculating each first
The closure of sagittal plane is highly compared, and then averages and is designated as the closure highly ratio, and result of calculation is painted of gel in whole rock core
Figure, mapping result is shown in Fig. 5：
In formula：r1For the depth of section of rock core, mm；r2Height, mm are blocked for gel；F1Compare for closure height, dimensionless.
（9）Gel closure area is than characterizing：In previous step, by gel after water drive gel area and hole in the horizontal
The gel that is used for of the gross area blocks area ratio, as shown in Fig. 2 calculating the closure area ratio in each cross section first, then
Average and be designated as the closure area ratio of gel in whole rock core, and result of calculation is drawn, mapping result is shown in Fig. 6：
In formula：S1For the area of section of rock core, mm2；S2Area, mm are blocked for gel2；F2For closure area ratio, dimensionless.
（10）Compare and block the sign of area ratio by blocking height, gel can be obtained height is blocked in migration process than becoming
Change less, be gradually reduced after closure area is more constant than elder generation.
Claims (5)
1. the visual evaluating method of seal-off effect of a kind of gel in rock microchannel, it is characterised in that comprise the following steps：
1) nuclear magnetic resonance equipment is opened, the rock core of saturation water is put into after 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, using low
Fluid signal in rock microchannel in field nuclear magnetic resonance equipment acquisition rock core displacement test；
2) gray level image is extracted：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 is more weak darker；
3) region of interesting extraction：The effective coverage of gray level image, wherein nuclear-magnetism figure are extracted in nuclear-magnetism image pick-up signal form
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) rock core skeleton is extracted：Binary conversion treatment, separation rock core skeleton and fluid information are carried out to the nuclear-magnetism image of saturated core,
Determine the skeleton structure of rock core；
6) add 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) gel images are extracted：Gel images are extracted according to nuclear magnetic resonance image, obtained after gel area, gel leading edge, gel
Edge and gel center parameter；
8) gel closure height is than characterizing：The water of the certain pore volume of displacement, waits solidifying rear gel and blocks height and rock in the vertical
The ratio of core diameter compares as gel closure height, and the closure that each sagittal plane is calculated first is highly compared, and then averages
The closure for being designated as gel in whole rock core is highly compared：
In formula：r1For the diameter of rock core, mm；r2To wait solidifying rear gel closure height, mm；F1Compare for closure height, dimensionless；
9) gel closure area is than characterizing：Gel blocks area on rock core cross section after the water of the certain pore volume of displacement, water drive
Area ratio is blocked with the gel that is used for of the area in rock core cross section；The closure area ratio in each cross section is calculated first, so
Average afterwards and be designated as the closure area ratio of gel in whole rock core：
In formula：S1For the cross sectional area of rock core, mm2；S2Area, mm are blocked for gel on rock core cross section2；F2For closure area
Than dimensionless；；
10) compared and change of the closure area than weighing gel seal-off effect by blocking height：Closure height compares and closure area ratio
It is bigger, illustrate that gel seal-off effect is stronger；Closure height ratio and block area ratio it is smaller, illustrate that gel seal-off effect is poorer.
2. the visual evaluating method of seal-off effect of the gel according to claim 1 in rock microchannel, its feature exists
In the size range diameter 25mm of the rock core, length 60mm~180mm.
3. the visual evaluating method of seal-off effect of the gel according to claim 1 in rock microchannel, its feature exists
In the core permeability scope 500mD~5000mD.
4. the visual evaluating method of seal-off effect of the gel according to claim 1 in rock microchannel, its feature exists
In the step 8) in displacement pressure limit be 0.01MPa~20MPa.
5. the visual evaluating method of seal-off effect of the gel according to claim 1 in rock microchannel, its feature exists
In the step 8) in displacement changes in flow rate scope be 0.1ml/min~5ml/min.
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