CN106447644A - New method for quantitative analysis of microscopic oil displacement experiment - Google Patents
New method for quantitative analysis of microscopic oil displacement experiment Download PDFInfo
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- CN106447644A CN106447644A CN201510465966.7A CN201510465966A CN106447644A CN 106447644 A CN106447644 A CN 106447644A CN 201510465966 A CN201510465966 A CN 201510465966A CN 106447644 A CN106447644 A CN 106447644A
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Abstract
The invention provides a new method for quantitative analysis of microscopic oil displacement experiment, which comprises the following steps: 1) using a microscopic model to perform an oil displacement experiment until the displacement is balanced; acquiring a microscopic photograph when the oil saturation of the microscopic model is completed and the displacement is balanced; 2) pre-processing the microscopic photograph; 3) according to the requirement for calculating parameters, decomposing the pre-processed microscopic photograph into several parts; 4) splicing the decomposed parts of the photograph for a new microscopic photograph that completely overlaps the original one; 5) measuring and calculating the areas of the decomposed parts; and 6) utilizing the calculated areas of the decomposed parts to calculate quantitatively the required physical parameters. In the present invention, the microscopic oil displacement effect is evaluated quantitatively from three aspects: microscopic wave coefficient, micro oil-displacement efficiency and micro oil-recovery efficiency, which provides more comprehensive and objective evaluations on the mechanism of an oil displacement system and the oil displacement effect.
Description
Technical field
The present invention relates to oil field development technical field, especially relate to a kind of microcosmic oil drive experiment quantitative
Analyzing novel methods.
Background technology
Often carry out oil displacement experiment using micromodel in oilfield development process, observe various oil displacement systems and exist
Flow process in pore media, carries out multiphase porous flow feature and mechanism of oil displacement research.But microcosmic oil drive
The analysis of experiment only rests in the means such as microimaging and photograph, can only do qualitative analyses it is impossible to right
Displacement of reservoir oil result carries out quantitative assessment and analysis.The progress of image analysis technology makes microcosmic oil drive experimental result
Quantitative analyses are developed.Patent CN 103761713 A provide only makes microcosmic oil drive test collection
The more uniform method of brightness of image, has no and is related to carry out microcosmic oil drive effect quantitatively analysis.CN
1270054C describes microcosmic oil drive dynamic color image quantization processing meanss and processing method, device to hole
Gap parameter, recovery ratio curve and water costa carry out quantitative analyses, from oil displacement efficiency with involving could not be
Several two aspects are analyzed to oil displacement efficiency comprehensively.CN 103544368 A respectively from oil displacement efficiency and
Two aspects of sweep efficiency have carried out quantitative analyses to the oil displacement efficiency of oil displacement system, but employ derivation
Method calculates to sweep efficiency.We have invented a kind of new microcosmic oil drive experiment quantitative analyses for this
New method, solves above technical problem.
Content of the invention
It is an object of the invention to provide one kind can be from microcosmic sweep efficiency and microscopic oil displacement efficiency two
The microcosmic oil drive experiment quantitative analyses that aspect individually carries out objective comprehensive analysis to microcosmic oil drive effect are new
Method.
The purpose of the present invention can be achieved by the following technical measures：Microcosmic oil drive experiment quantitative analyses are new
Method, this microcosmic oil drive experiment quantitative analyses new method includes：Step 1, is carried out using micromodel
Oil displacement experiment, until displacement balance, collection micromodel saturated oils finish micro- when balancing with the displacement of reservoir oil
Photo；Step 2, carries out pretreatment to microphotograph；Step 3, according to the needs of calculating parameter, will
The micro-image of pretreatment disassembles into several parts；Step 4, by the various pieces being disassembled split
It is the new micro-image being completely superposed with former micro-image；Step 5, calculates split each portion solving
The area dividing；Step 6, using each physics ginseng needed for the areal calculation quantitative Analysis of various pieces
Number.
The purpose of the present invention also can be achieved by the following technical measures：
In step 1, the colourless stratum water of the initial saturation of micromodel, then saturated oils, saturation finishes
Gather microphotograph afterwards, then carry out oil displacement experiment using through hyperchromatic stratum water, until displacement is put down
Weighing apparatus, gathers microphotograph again.
In step 3, when pretreatment is carried out to microphotograph, cutting is carried out to microphotograph, only retain
Model pattern region, the microphotograph tool when saturation viscous crude of pretreatment finishes and when the displacement of reservoir oil balances
There is identical area.
In step 4, according to the needs of calculating parameter, the micro-image of pretreatment is disassembled into several portions
Point, the selection disassembling part is automatically chosen according to the difference of color and is entered with reference to the mode of human-computer interaction
OK.
In step 4, according to the difference disassembling part colours and distribution, saturation stratum water is colourless, drives
Alternately layer water be pink, oil be black, rock matrix be Lycoperdon polymorphum Vitt, respectively by micro-image disassemble for
Several parts individually preserving accordingly.
In step 4, the various pieces being disassembled individually become an image, and are again rendered into pure color,
Two kinds of colors are only had, a kind of is white, and one kind is rendered again for appropriate section in each image file
Color.
In step 4, each image disassembling part is rendered into pure color, wherein bypassed area even again
Continuous oil is black, and felt area dispersed oil is green, and felt area displacing fluid is pink, and rock matrix is
Yellow.
In step 4, by the various pieces disassembled again split be new images and with former micro-image pair
Than, discrepant position is modified in the image accordingly disassembled, until split new images with
Former micro-image is completely superposed.
Face in step 5, according to shared by the different measuring and calculating various pieces of the various pieces color disassembled out
Long-pending, total surface area S_ I of micromodel, pasta when oily saturation finishes amasss S_ II, rock matrix table
Area S_ III, the pasta not involving drive amasss S_ IV, and the continuous pasta not involving drive amasss S_ V, involves
The area S_ VI of area's displacing fluid, the area S_ VII of the remaining scattered oil of felt area.
In step 6, calculate various colors shared by area it is assumed that micromodel etching depth is identical,
By in reservoir physics to irreducible water saturation Swi, porosity Φ, sweep efficiency Ev, oil displacement efficiency ED
With recovery ratio ERDefinition, by the area of the various pieces disassembled out calculate respectively microcosmic oil drive experiment
The parameter of quantitative analyses, its computing formula is as follows respectively：
Irreducible water saturation：
Areal porosity：
Microcosmic sweep efficiency：
Microscopic oil displacement efficiency：
Microcosmic recovery ratio：ER=EV×ED×100℃.
Microcosmic oil drive experiment quantitative analyses new method " solution-close " method in the present invention, to its displacement of reservoir oil
Effect carries out new method " solution-close " method (Cutout-Flattent Image) of quantitative assessment,
The method includes gathering the micro- photograph that saturated oils expelling water finishes the model in two moment when balancing with the displacement of reservoir oil
Piece；Two width microphotograpies are disassembled with (Cutout) and split (Flattent), by continuous
Revise the various pieces disassembled and make the picture after their splits consistent with former microphotograph；By image
The area of part is respectively disassembled in processing method measuring and calculating, for quantitative Analysis microcosmic sweep efficiency, microcosmic oil drive
Efficiency and microcosmic recovery ratio.The method patent different from the past, it is right to be achieved using image analysis method
Areal porosity, irreducible water saturation, microcosmic sweep efficiency, microscopic oil displacement efficiency and microcosmic sweep efficiency
Quantitative assessment, individually to microcosmic oil drive effect in terms of microcosmic sweep efficiency and microscopic oil displacement efficiency two
Carry out objective comprehensive analysis, can respectively microcosmic sweep efficiency, microscopic oil displacement efficiency and microcosmic be adopted
Yield carries out quantitative assessment, the mechanism of action to oil displacement system and the evaluation of oil displacement efficiency more objective and
Comprehensively.
Brief description
Fig. 1 is that in the present invention one specific embodiment, saturated oils finish microphotograph " solution-close " method processing stream
The flow chart of journey figure；
Fig. 2 is displacement of reservoir oil balance microphotograph " solution-close " method handling process in the present invention one specific embodiment
Figure；
Fig. 3 is the micro-image gathering when the saturated oils of pretreatment finish；
Fig. 4 is the micro-image gathering when the displacement of reservoir oil balance of pretreatment；
The schematic diagram that when Fig. 5 finishes for saturated oils, micro-image is disassembled；
The schematic diagram that when Fig. 6 balances for the displacement of reservoir oil, micro-image is disassembled；
Fig. 7 for saturated oils finish after the split of the various pieces that micro-image is disassembled with former micro-image
To when revising schematic diagram；
With former micro-image after the split of the various pieces that micro-image is disassembled when Fig. 8 balances for the displacement of reservoir oil
To when revising schematic diagram.
Specific embodiment
Above and other objects, features and advantages for enabling the present invention become apparent, cited below particularly
Go out preferred embodiment, and coordinate shown in accompanying drawing, be described in detail below.
As depicted in figs. 1 and 2, Fig. 1 and Fig. 2 is the microcosmic oil drive experiment quantitative analyses newly side of the present invention
The flow chart of method.
In step 1, by stratum water colourless for micromodel saturation, then carry out crude oil and drive stratum water in fact
Test and set up irreducible water saturation, treat that saturation crude oil finishes, collection saturation crude oil micromodel micro-
Image.And then adopt and carry out flood pot test through hyperchromatic stratum water (pink), until driving
For balance, the micro-image of micromodel during collection displacement balance.
In step 2, when respectively saturation crude oil being finished using image processing software and when the displacement of reservoir oil balances
Microphotograph is sheared, and only retains the image of area of the pattern, sees Fig. 3 and Fig. 4, in Fig. 3, black is
Oil, Lycoperdon polymorphum Vitt are rock matrix；In Fig. 4, black is oil, and another color is driven water-replacing (pink colour).Warp
Cross when the saturation viscous crude of pretreatment finishes and microphotograph during displacement of reservoir oil balance has identical area, note
For SI.
In step 3, according to the needs of calculating parameter, according to various pieces color in micromodel not
With the saturation crude oil through pretreatment being finished micro-image when balancing with the displacement of reservoir oil and carries out segmentation and disassemble
For several parts, and again it is rendered into different colors.Wherein, the micro-image that saturation crude oil finishes
Disassemble as saturation crude oil (black) and rock matrix (yellow)；Micro-image during displacement of reservoir oil balance is torn open
Solve as rock matrix (yellow, same as above), the continuous crude oil in bypassed area domain (black), involve
Region displacing fluid (pink), the remaining scattered crude oil (green) in affected area.Micro-image warp
Cross the image individually saving as binary color after disassembling, the result specifically disassembled is shown in Fig. 5 and Fig. 6.
In step 4, micro-image when finishing saturation crude oil respectively and when the displacement of reservoir oil balances is disassembled out
Various pieces carry out split, and the image after split and each self-corresponding former micro-image are carried out right
Than.If variant part, again former micro-image is modified with (again disassembling and split),
Until the micro-image after split is completely the same with former micro-image.Former micro-image disassemble out each
The split of parts of images, the micro-image of split is with corresponding former micro-image to the flow process when revised
Figure, is shown in Fig. 7 and Fig. 8.
In step 5, according to the difference of various pieces color, respectively disassembled using image processing software measuring and calculating
The area of the part going out.The face of the micro-image after micro-image is pretreated when saturation crude oil finishes
Long-pending, the saturation crude oil part disassembled out by it and the area of rock matrix part be designated as respectively S_ I,
S_ II and S_ III.During displacement of reservoir oil balance, the area of the various pieces that micro-image is disassembled out is respectively：Not
Continuous crude oil area S_ IV, the area S_ V of felt area displacing fluid (water) of felt area, involves
The area S_ VI of the remaining scattered crude oil in area.In this example, the area of the various pieces calculating is shown in
Table 1.
The measuring and calculating area of the various pieces that table 1 micro-image is disassembled out
In step 6, disassemble out the measuring and calculating area of part it is assumed that micro- using each of measuring and calculating in step 5
See model etching depth identical, by reservoir physics to irreducible water saturation, porosity, sweep efficiency,
Oil displacement efficiency and the definition of recovery ratio, calculate microcosmic respectively by the area of the various pieces disassembled out and drive
The parameter of oil experiment quantitative analyses, its computing formula is as follows respectively：
Irreducible water saturation：
Areal porosity：
Microcosmic sweep efficiency：
Microscopic oil displacement efficiency：
Microcosmic recovery ratio：ER=EV×ED× 100%.
In this example, the concrete numerical value through calculating above-mentioned each parameter is shown in Table 2.
Table 2 microcosmic oil drive tests the calculating parameter of quantitative analyses
The microcosmic oil drive experiment quantitative analyses new method of the present invention, is related to microscopic seepage experimental analysiss, is
Observe flow process in pore media for the various oil displacement systems, carry out multiphase porous flow feature and displacement of reservoir oil machine
The important method of reason research.Oil recovery is the product of sweep efficiency and displacement efficiency, sweep efficiency
It is not quite similar with the influence factor of displacement efficiency, in microcosmic oil drive experiment, only just know that the result of recovery ratio
The requirement of increasingly complicated mechanism of oil displacement analysis can not be met, need individually oil displacement system to be expanded and involve
The effect of coefficient and raising oil displacement efficiency carries out quantitative assessment, and further investigation oil displacement system improves recovery ratio
Mechanism, make the effect assessment of oil displacement system more objective comprehensively.
Claims (10)
1. microcosmic oil drive experiment quantitative analyses new method is it is characterised in that the experiment of this microcosmic oil drive is fixed
Amount analyzing novel methods include：
Step 1, carries out oil displacement experiment using micromodel, until displacement balance, gathers micromodel
Saturated oils finish microphotograph when balancing with the displacement of reservoir oil；
Step 2, carries out pretreatment to microphotograph；
Step 3, according to the needs of calculating parameter, the micro-image of pretreatment is disassembled into several parts；
Step 4, the various pieces being disassembled split is newly to show with what former micro-image was completely superposed
Micro- image；
Step 5, calculates the area of the split various pieces solving；
Step 6, using each physical parameter needed for the areal calculation quantitative Analysis of various pieces.
2. microcosmic oil drive according to claim 1 tests quantitative analyses new method, and its feature exists
In, in step 1, the colourless stratum water of the initial saturation of micromodel, then saturated oils, saturation finishes
Gather microphotograph afterwards, then carry out oil displacement experiment using through hyperchromatic stratum water, until displacement is put down
Weighing apparatus, gathers microphotograph again.
3. microcosmic oil drive according to claim 1 tests quantitative analyses new method, and its feature exists
In in step 3, when pretreatment is carried out to microphotograph, cutting being carried out to microphotograph, only retains
Model pattern region, the microphotograph tool when saturation viscous crude of pretreatment finishes and when the displacement of reservoir oil balances
There is identical area.
4. microcosmic oil drive according to claim 1 tests quantitative analyses new method, and its feature exists
In, in step 4, according to the needs of calculating parameter, the micro-image of pretreatment being disassembled into several portions
Point, the selection disassembling part is automatically chosen according to the difference of color and is entered with reference to the mode of human-computer interaction
OK.
5. microcosmic oil drive according to claim 4 tests quantitative analyses new method, and its feature exists
In in step 4, according to the difference disassembling part colours and distribution, saturation stratum water is colourless, drives
Alternately layer water be pink, oil be black, rock matrix be Lycoperdon polymorphum Vitt, respectively by micro-image disassemble for
Several parts individually preserving accordingly.
6. microcosmic oil drive according to claim 5 tests quantitative analyses new method, and its feature exists
In, in step 4, the various pieces being disassembled individually become an image, and are again rendered into pure color,
Two kinds of colors are only had, a kind of is white, and one kind is rendered again for appropriate section in each image file
Color.
7. microcosmic oil drive according to claim 6 tests quantitative analyses new method, and its feature exists
In in step 4, each image disassembling part being rendered into pure color again, wherein bypassed area is even
Continuous oil is black, and felt area dispersed oil is green, and felt area displacing fluid is pink, and rock matrix is
Yellow.
8. the microcosmic oil drive experiment quantitative analyses newly side according to claim 1 and claim 6
Method it is characterised in that in step 4, by the various pieces disassembled again split be new images and with
Former micro-image contrast, discrepant position is modified in the image accordingly disassembled, until spelling
The new images closing are completely superposed with former micro-image.
9. microcosmic oil drive according to claim 1 tests quantitative analyses new method, and its feature exists
In the face in step 5, according to shared by the different measuring and calculating various pieces of the various pieces color disassembled out
Long-pending, total surface area S_ I of micromodel, pasta when oily saturation finishes amasss S_ II, rock matrix table
Area S_ III, the pasta not involving drive amasss S_ IV, and the continuous pasta not involving drive amasss S_ V, involves
The area S_ VI of area's displacing fluid, the area S_ VII of the remaining scattered oil of felt area.
10. microcosmic oil drive according to claim 9 tests quantitative analyses new method, and its feature exists
In, in step 6, calculate various colors shared by area it is assumed that micromodel etching depth is identical,
By in reservoir physics to irreducible water saturation Swi, porosity Φ, sweep efficiency Ev, oil displacement efficiency ED
With recovery ratio ERDefinition, by the area of the various pieces disassembled out calculate respectively microcosmic oil drive experiment
The parameter of quantitative analyses, its computing formula is as follows respectively：
Irreducible water saturation：
Areal porosity：
Microcosmic sweep efficiency：
Microscopic oil displacement efficiency：
Microcosmic recovery ratio：ER=EV×ED× 100%.
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| CN112360410A (en) * | 2020-11-23 | 2021-02-12 | 中国石油天然气股份有限公司 | Method for improving water-drive oil displacement efficiency of low-permeability reservoir |
| CN117030706A (en) * | 2023-08-09 | 2023-11-10 | 大庆亿莱检验检测技术服务有限公司 | Detection method for adsorption of nano oil displacement agent |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831148A (en) * | 2017-10-09 | 2018-03-23 | 东北石油大学 | One kind visualization microcosmic displacement dynamic observation procedure of core model |
| CN107831148B (en) * | 2017-10-09 | 2020-06-02 | 东北石油大学 | Visual core model micro-displacement dynamic observation method |
| CN107975366A (en) * | 2017-11-24 | 2018-05-01 | 北京科技大学 | A kind of water shutoff agent plugging and profile con-trol visual evaluating method in porous media |
| CN107975366B (en) * | 2017-11-24 | 2020-07-17 | 北京科技大学 | Visual evaluation method for plugging profile control of water plugging agent in porous medium |
| CN112360410A (en) * | 2020-11-23 | 2021-02-12 | 中国石油天然气股份有限公司 | Method for improving water-drive oil displacement efficiency of low-permeability reservoir |
| CN117030706A (en) * | 2023-08-09 | 2023-11-10 | 大庆亿莱检验检测技术服务有限公司 | Detection method for adsorption of nano oil displacement agent |
| CN117030706B (en) * | 2023-08-09 | 2024-03-19 | 大庆亿莱检验检测技术服务有限公司 | Detection method for adsorption of nano oil displacement agent |
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