CN110702577A - Device and method for visualizing dynamic adsorption of polymer in micro-pore model - Google Patents
Device and method for visualizing dynamic adsorption of polymer in micro-pore model Download PDFInfo
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- CN110702577A CN110702577A CN201910976384.3A CN201910976384A CN110702577A CN 110702577 A CN110702577 A CN 110702577A CN 201910976384 A CN201910976384 A CN 201910976384A CN 110702577 A CN110702577 A CN 110702577A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0023—Investigating dispersion of liquids
- G01N2015/0034—Investigating dispersion of liquids in solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0846—Investigating permeability, pore-volume, or surface area of porous materials by use of radiation, e.g. transmitted or reflected light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/0866—Sorption
Abstract
The invention relates to a device and a method for visualizing dynamic adsorption of a polymer in a Micro-pore model, which are characterized by comprising a fluid injection device, a collector, a Micro-PIV device and a chromatograph, wherein the Micro-PIV device comprises a CCD (charge coupled device) camera, a microscope system, a laser and a computer; the outlet of the fluid injection device is connected with the inlet of the micro-pore model, the fluid injection device is used for injecting polymer solution or liquid with PIV tracer particles into the micro-pore model, and the outlet of the micro-pore model is connected with the inlet of the collector; a CCD camera and a microscope system are sequentially arranged above the micro-pore model from top to bottom; a laser and a chromatograph are arranged on one side of the micro-pore model; the CCD camera is electrically connected with a computer, and the computer is used for carrying out image processing on the tracer particle distribution image collected by the CCD camera and obtaining the flow field distribution of the tracer particles in the micro-pore model in real time.
Description
Technical Field
The invention relates to a device and a method for visualizing dynamic adsorption of a polymer in a micro-pore model, belonging to the field of oilfield chemical flooding.
Background
Polymer flooding is one of the leading ways of improving the recovery ratio of crude oil in China, is effective and feasible in both economy and technology, and is widely applied to various oil fields in China. The polymer is adsorbed and retained in the stratum migration process, so that the pore structure of a reservoir is changed, the fluid dynamics and the physical and chemical properties of oil and water in pores are directly influenced, and the success or failure of polymer oil displacement depends on the adsorption and retention degree of the polymer in an oil reservoir to a great extent.
At present, researchers mainly calculate the adsorption amount and the layer thickness of a polymer by methods such as a starch-cadmium iodide colorimetric method, a chromatography method, a capillary flow method and the like, however, the methods cannot visually and dynamically measure the adsorption process of the polymer.
Disclosure of Invention
In view of the above problems, the present invention provides an apparatus and method for visualizing the dynamic adsorption of polymer in a micro-pore model, which can visually and dynamically measure the adsorption process of polymer.
In order to achieve the purpose, the invention adopts the following technical scheme: the device for visualizing the dynamic adsorption of the polymer in the Micro-pore model is characterized by comprising a fluid injection device, a collector, a Micro-PIV device and a chromatograph, wherein the Micro-PIV device comprises a CCD camera, a microscope system, a laser and a computer; the outlet of the fluid injection device is connected with the inlet of the micro-pore model, the fluid injection device is used for injecting polymer solution or liquid with PIV tracer particles into the micro-pore model, and the outlet of the micro-pore model is connected with the inlet of the collector; the CCD camera and the microscope system are sequentially arranged above the micro-pore model from top to bottom, and the CCD camera is used for acquiring a tracer particle distribution image in the micro-pore model in real time through the microscope system; the laser and the chromatograph are arranged on one side of the micro-pore model, the laser is used for emitting exciting light to the micro-pore model, and the chromatograph is used for measuring the concentration of liquid in the micro-pore model; the CCD camera is electrically connected with the computer, and the computer is used for carrying out image processing on the tracer particle distribution image collected by the CCD camera and obtaining the flow field distribution of the tracer particles in the micro-pore model in real time.
Further, the fluid injection device comprises three injection pumps, and liquid outlets of the three injection pumps are respectively connected with a liquid inlet of the micro-pore model.
Further, polymer solution, transparent oil with PIV tracer particles and pure water/saline water with the PIV tracer particles are placed in the three injection pumps, and the fluid injection speed of the three injection pumps ranges from 0.0001 ml/min to 0.009 ml/min.
Further, the emitting direction of the laser is perpendicular to or parallel to the incident direction of the microscope system and the lens of the CCD camera.
Further, the PIV tracing particles adopt nano-scale PIV tracing particles.
Further, the micro-pore model is manufactured in a 3D printing or etching mode.
Further, the micro-pore model is made of transparent materials.
Further, the transparent material is glass or an organic polymer polymethyl methacrylate.
A method for visualizing the dynamic adsorption of a polymer in a microscopic pore model, comprising: 1) horizontally placing the micro-pore model, injecting a polymer solution into the micro-pore model by a fluid injection device at a constant speed, measuring the concentration of the polymer solution in the micro-pore model by a chromatograph, closing the fluid injection device and stopping injecting the polymer solution when the concentration of the polymer at an outlet of the micro-pore model is the same as the concentration of the polymer at an inlet of the micro-pore model; 2) the fluid injection device injects transparent oil with PIV tracer particles into the micro-pore model at a constant speed, a laser is started, exciting light is emitted to the micro-pore model, and the tracer particles are excited to generate fluorescence; 3) the CCD camera records a trace particle distribution image in the micro-pore model in the injection process through a microscope system, and observes the change process of the no-flow area of the inner wall surface of the micro-pore model; 4) the computer carries out image processing on the distribution image of the tracer particles, the flow field distribution of the tracer particles in the micro-pore model is obtained in real time, and when the wall surface no-flow area in the micro-pore model does not change any more, the fluid injection device is closed, and the injection of the transparent oil with the PIV tracer particles is stopped; 5) the fluid injection device injects saline with PIV tracer particles into the micro-observation pore model at a constant speed; 6) the CCD camera records the flow field distribution in the micro-pore model in the injection process through a microscope system and observes the change process of the no-flow area on the inner wall surface of the micro-pore model; 7) and (3) carrying out image processing on the tracer particle distribution image by the computer, obtaining the flow field distribution of the tracer particles in the micro-pore model in real time, stopping injecting saline water with PIV tracer particles when the concentration of liquid at an outlet of the micro-pore model is determined to be constant by the chromatograph, and closing the laser.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention can freely adjust the fluid speed due to the arrangement of the fluid injection device, can also replace Micro-pore models with different structures and different materials, analyzes the flow field characteristics through a Micro-PIV (Micro image particle velocimetry) device, observes the change process of a wall surface no-flow area in the Micro-pore model, namely an adsorption layer, and realizes the visualization of the dynamic adsorption of the polymer in the Micro-pore model. 2. Because the Micro-PIV device is arranged, the flow field distribution of the tracer particles in the Micro-pore model is obtained in real time through image quantitative analysis in a PIV tracer particle velocity measurement mode, so that the thickness of the adsorption layer can be obtained, the implementation process is simple and convenient, and the result is visual and reliable. 3. The invention is provided with a CCD (charge coupled device) camera and a microscope system, can observe the influence of the adsorption layer of the micro-pore model on the distribution of the flow field in real time, can realize the research of polymer flooding micro mechanism by changing the type of polymer solution, the structure of the micro-pore model, the injection rate of the solution and the like, and has the advantages of high efficiency and flexibility. 4. According to the invention, the micro-pore model is manufactured by adopting a 3D printing or etching mode, so that the precision and repeatability of the experiment can be ensured, the scientific research application value is higher, and the method can be widely applied to the fields of polymer performance evaluation, polymer flooding micro mechanism research and the like.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the distribution of the flow field in the no-flow area of the wall of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention.
As shown in FIG. 1, the apparatus for visualizing the dynamic adsorption of a polymer in a Micro-pore model provided by the invention comprises a fluid injection device 1, a collector 2, a Micro-PIV device 3 and a chromatograph, wherein the Micro-PIV device 3 comprises a CCD (charge coupled device) camera 31, a microscope system 32, a laser 33 and a computer.
The liquid outlet of the fluid injection device 1 is connected with the inlet of the micro-pore model 4, the fluid injection device 1 is used for injecting polymer solution or liquid with PIV tracer particles (transparent oil, pure water or saline water with the PIV tracer particles) into the micro-pore model 4 at a constant speed, and the outlet of the micro-pore model 4 is connected with the inlet of the collector 2. The CCD camera 31 and the microscope system 32 are sequentially arranged above the micro-pore model 4 from top to bottom, the CCD camera 31 is used for acquiring a trace particle distribution image in the micro-pore model 4 in real time through the microscope system 32 so as to analyze a follow current field, a laser 33 is arranged on one side of the micro-pore model 4, the laser 33 is used for emitting exciting light to the micro-pore model 4, and the emitting direction of the laser 33 is perpendicular to or parallel to the incident directions of lenses of the microscope system 32 and the CCD camera 31. A chromatograph is also arranged on one side of the micro-pore model 4 for measuring the concentration of the liquid in the micro-pore model 4.
The CCD camera 31 is electrically connected with a computer, and the computer is used for carrying out image processing on the tracer particle distribution image collected by the CCD camera 31 and obtaining the flow field distribution of the tracer particles in the micro-pore model 4 in real time.
In a preferred embodiment, the fluid injection device 1 comprises three micro injection pumps 11, the liquid outlets of the three micro injection pumps 11 are respectively connected with the liquid inlet of the micro pore model 4, the three micro injection pumps 11 are used for placing polymer solution, transparent oil with PIV tracer particles and pure water/saline water with PIV tracer particles, and the fluid injection speed of the three micro injection pumps 11 ranges from 0.0001 to 0.009 ml/min.
In a preferred embodiment, the PIV tracer particles are nano-scale PIV tracer particles.
In a preferred embodiment, the micro-pore model 4 can be made by 3D printing or etching, and the micro-pore model 4 is made of transparent material such as glass or organic polymer polymethyl methacrylate (PMMA).
Based on the above apparatus for visualizing dynamic adsorption of polymer in a micro-pore model, the method for visualizing dynamic adsorption of polymer in a micro-pore model according to the present invention is described in detail below by specific embodiments:
1) the micro-pore model 4 is a two-dimensional flat plate model manufactured in a 3D printing mode, the micro-pore model 4 is horizontally placed in the experiment process, and the polymer solution is AP-P4 solution with the concentration of 2000 mg/L.
2) The fluid injection apparatus 1 injects the polymer solution into the micro pore model 4 at a constant rate, the chromatograph measures the concentration of the polymer solution in the micro pore model 4, and when the polymer concentration at the outlet of the micro pore model 4 is the same as the polymer concentration at the inlet of the micro pore model 4, the fluid injection apparatus 1 is turned off and the injection of the polymer solution is stopped.
3) The fluid injection device 1 injects transparent oil with PIV tracer particles into the micro-pore model 4 at a constant speed, the laser 33 is started, exciting light is emitted to the micro-pore model 4, and the tracer particles are excited to generate fluorescence, wherein the PIV tracer particles adopt glass spheres with the diameter of 100 nm.
4) The CCD camera 31 records the distribution image of trace particles in the micro-pore model 4 during the injection process by the microscope system 32, and observes the change process of the no-flow area of the wall surface in the micro-pore model 4.
5) And (3) carrying out image processing on the tracer particle distribution image by the computer, obtaining the flow field distribution of the tracer particles in the micro-pore model 4 in real time, closing the fluid injection device 1 and stopping injecting the transparent oil with the PIV tracer particles when the wall surface no-flow area in the micro-pore model 4 is not changed any more, wherein the wall surface no-flow area in the micro-pore model 4 is the polymer adsorption layer, as shown in figure 2.
6) The fluid injection device 1 injects the brine with the PIV trace particles into the micro-pore model 4 at a constant speed, wherein the salinity of the brine with the PIV trace particles is 1500mg/L, and the PIV trace particles adopt glass spheres with the diameter of 100 nm.
7) The CCD camera 31 records the distribution image of trace particles in the micro-pore model 4 during the injection process by the microscope system 32, and observes the change process of the no-flow area of the wall surface in the micro-pore model 4.
8) And (3) carrying out image processing on the tracer particle distribution image by the computer, obtaining the flow field distribution of the tracer particles in the micro-pore model 4 in real time, stopping injecting saline water with the PIV tracer particles when the concentration of liquid at an outlet of the micro-pore model 4 is determined to be constant by the chromatograph, and closing the laser 33.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. The device for visualizing the dynamic adsorption of the polymer in the Micro-pore model is characterized by comprising a fluid injection device, a collector, a Micro-PIV device and a chromatograph, wherein the Micro-PIV device comprises a CCD camera, a microscope system, a laser and a computer;
the outlet of the fluid injection device is connected with the inlet of the micro-pore model, the fluid injection device is used for injecting polymer solution or liquid with PIV tracer particles into the micro-pore model, and the outlet of the micro-pore model is connected with the inlet of the collector; the CCD camera and the microscope system are sequentially arranged above the micro-pore model from top to bottom, and the CCD camera is used for acquiring a tracer particle distribution image in the micro-pore model in real time through the microscope system; the laser and the chromatograph are arranged on one side of the micro-pore model, the laser is used for emitting exciting light to the micro-pore model, and the chromatograph is used for measuring the concentration of liquid in the micro-pore model;
the CCD camera is electrically connected with the computer, and the computer is used for carrying out image processing on the tracer particle distribution image collected by the CCD camera and obtaining the flow field distribution of the tracer particles in the micro-pore model in real time.
2. The apparatus for visualizing dynamic adsorption of a polymer in a micropore model as recited in claim 1, wherein said fluid injection means comprises three injection pumps, and the liquid outlets of said three injection pumps are respectively connected to the liquid inlets of said micropore model.
3. The apparatus for visualization of polymer dynamic adsorption in a micro-pore model according to claim 2, wherein three of said syringe pumps are placed with polymer solution, transparent oil with PIV tracer particles and pure water/brine with PIV tracer particles, and the fluid injection speed of the three syringe pumps is in the range of 0.0001-0.009 ml/min.
4. The apparatus for visualizing the dynamic adsorption of polymers in a microscopic pore model according to claim 1, wherein the emitting direction of the laser is perpendicular or parallel to the incident direction of the lens of the microscope system and the CCD camera.
5. The apparatus for visualizing dynamic adsorption of polymers in a microporosity model of claim 1, wherein the PIV tracer particles are nanoscale PIV tracer particles.
6. The apparatus for visualizing dynamic adsorption of polymers in a micropore model as recited in claim 1, wherein said micropore model is fabricated by 3D printing or etching.
7. The apparatus for visualizing dynamic adsorption of polymers in a micropore model as in claim 1, wherein the micropore model is made of a transparent material.
8. The apparatus for visualizing the dynamic adsorption of polymers in a micropore model as recited in claim 7, wherein said transparent material is glass or an organic polymer of polymethylmethacrylate.
9. A method for visualizing the dynamic adsorption of a polymer in a microscopic pore model, comprising:
1) horizontally placing the micro-pore model, injecting a polymer solution into the micro-pore model by a fluid injection device at a constant speed, measuring the concentration of the polymer solution in the micro-pore model by a chromatograph, closing the fluid injection device and stopping injecting the polymer solution when the concentration of the polymer at an outlet of the micro-pore model is the same as the concentration of the polymer at an inlet of the micro-pore model;
2) the fluid injection device injects transparent oil with PIV tracer particles into the micro-pore model at a constant speed, a laser is started, exciting light is emitted to the micro-pore model, and the tracer particles are excited to generate fluorescence;
3) the CCD camera records a trace particle distribution image in the micro-pore model in the injection process through a microscope system, and observes the change process of the no-flow area of the inner wall surface of the micro-pore model;
4) the computer carries out image processing on the distribution image of the tracer particles, the flow field distribution of the tracer particles in the micro-pore model is obtained in real time, and when the wall surface no-flow area in the micro-pore model does not change any more, the fluid injection device is closed, and the injection of the transparent oil with the PIV tracer particles is stopped;
5) the fluid injection device injects saline with PIV tracer particles into the micro-observation pore model at a constant speed;
6) the CCD camera records the flow field distribution in the micro-pore model in the injection process through a microscope system and observes the change process of the no-flow area on the inner wall surface of the micro-pore model;
7) and (3) carrying out image processing on the tracer particle distribution image by the computer, obtaining the flow field distribution of the tracer particles in the micro-pore model in real time, stopping injecting saline water with PIV tracer particles when the concentration of liquid at an outlet of the micro-pore model is determined to be constant by the chromatograph, and closing the laser.
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Cited By (2)
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| CN111307686A (en) * | 2020-02-28 | 2020-06-19 | 中国海洋大学 | Experimental device and method for observing deformation of dam impervious wall based on PIV technology |
| CN115932321A (en) * | 2022-12-22 | 2023-04-07 | 武汉大学 | Microscopic erosion visualization device and method based on particle image velocimetry |
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