Real carbonate rock micro-fluidic chip and preparation method thereof

Abstract

The invention belongs to the technical field of micro-fluidic chips, and discloses a real carbonate rock micro-fluidic chip and a preparation method thereof.A binder is poured into a groove in a transparent substrate, then a core slice is placed on the surface of the uncured binder in the groove, and after the binder is cured, the surface of the core slice is ground to obtain the real carbonate rock micro-fluidic chip. Then patterning the surface of the core slice by using laser, and etching a real pore channel image, a liquid injection channel and a liquid outflow channel; covering the surface of the semi-finished product carbonate rock micro-fluidic chip with a PDMS film; the transparent cover plate covers the surface of the PDMS film, the transparent substrate, the PDMS film and the transparent cover plate are fixedly connected, and liquid inlets and liquid outlets are formed in the positions, corresponding to the liquid injection channel and the liquid outflow channel, of the transparent cover plate and the PDMS film. According to the micro-fluidic chip, the real pore channel structure can be restored in the micro-fluidic chip, the mineral characteristics of the real stratum can be restored at the same time, and the visibility of the micro-fluidic chip is not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of microfluidic chips, in particular to a real carbonate rock microfluidic chip and a preparation method thereof. Background Art

[0002] As an emerging experimental method, microfluidics has been widely used in fields such as chemistry, biology, and materials science. Its main advantage is the ability to control and observe fluid behavior at the microscale with high resolution, high precision, and high flexibility. However, the application of microfluidics in the fields of geology and petroleum engineering, especially in simulating real rock pore structures, such as carbonate rocks, still faces many challenges. At present, the existing microfluidic chip materials are difficult to fully simulate the complex pore structure and fluid behavior in the real geological environment, resulting in limited accuracy and credibility of the experimental results. Therefore, how to restore the mineral characteristics of the real formation while restoring the real pore channel structure in the microfluidic chip and ensuring that its visibility is not affected is a key issue. Summary of the invention

[0003] In order to solve the problem that current microfluidic chips cannot truly simulate the mineral characteristics of strata, the purpose of the present invention is to provide a real carbonate rock microfluidic chip and a preparation method thereof. The present invention can restore the mineral characteristics of the real strata while restoring the real pore channel structure in the microfluidic chip and ensure that its visibility is not affected.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows: A method for preparing a real carbonate rock microfluidic chip includes the following steps: The adhesive is poured into the groove on the prepared transparent substrate, and then the core slice is placed on the uncured adhesive surface in the groove. After the adhesive is cured, the surface of the core slice is ground, and then the surface of the core slice is patterned by laser to etch out the real pore channel image, the liquid injection channel and the liquid outflow channel to obtain a semi-finished carbonate rock microfluidic chip; then the surface of the semi-finished carbonate rock microfluidic chip is covered with a PDMS film; the prepared transparent cover sheet is covered on the surface of the PDMS film, and the transparent substrate, the PDMS film and the transparent cover sheet are fixedly connected to obtain the real carbonate rock microfluidic chip, wherein the transparent cover sheet and the PDMS film are both provided with a liquid inlet and a liquid outlet at positions corresponding to the liquid injection channel and the liquid outflow channel.

[0005] Preferably, the radial dimension of the core slice is smaller than the radial dimension of the groove, the thickness of the core slice is greater than or equal to the depth of the groove, and the depth difference is 0-0.5 mm.

[0006] Preferably, the shape of the core slice is rectangular, and the shape of the groove is rectangular; the length of the core slice is 0.5-1 mm smaller than the length of the groove, and the width of the core slice is 0.5-1 mm smaller than the width of the groove; the thickness of the core slice is 200-500 µm, and the depth of the groove is 200-500 µm.

[0007] Preferably, when pouring the adhesive into the groove on the transparent substrate, the adhesive is completely spread over the groove.

[0008] Preferably, the adhesive is epoxy glue or UV glue.

[0009] Preferably, after grinding the surface of the core slice, the surface of the core slice is flush with the surface of the transparent substrate and the surface is flat and smooth.

[0010] Preferably, the real pore channel image is obtained by scanning a real core by CT and then performing digital image processing.

[0011] Preferably, the thickness of the PDMS film is 0.5-1.0 mm.

[0012] Preferably, the carbonate rock is selected from dolomite or marble.

[0013] Preferably, the four corners of the transparent substrate, the PDMS film and the transparent cover are fixedly connected by screws to form an integrated structure.

[0014] The present invention also provides a real carbonate rock microfluidic chip, which is prepared by the preparation method of the present invention.

[0015] The present invention has the following beneficial effects: The significant advantage of the present invention is that the real pore channels are etched onto the core, which can simulate the real pore channels and retain the real geological environment, and ensure the visualization of the experimental process. By etching the real pore channels on the real core slices, simulating the real geological environment, and combining the use of transparent materials, real-time observation and precise control of the fluid flow process are achieved, which not only improves the accuracy and credibility of the experiment, but also is simple to make, reduces the experimental cost, and has a simple and ingenious principle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a real carbonate rock microfluidic chip base (i.e., transparent substrate) in an embodiment of the present invention; Figure 2 Schematic diagram of a semi-finished carbonate rock microfluidic chip in an embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of a microfluidic chip based on real carbonate rock in an embodiment of the present invention; Figure 4This is a physical picture of the real carbonate rock microfluidic chip obtained in Example 2 of the present invention.

[0017] In the figure, 1-transparent substrate, 2-groove, 3-core slice, 4-bolt, 5-transparent cover, 6-PDMS film, 7-threaded hole. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific drawings and specific embodiments. Unless otherwise specified or conflicting, the preferred embodiments can be combined arbitrarily.

[0019] See also Figure 1-Figure 4 The present invention provides a real carbonate rock microfluidic chip, comprising two rectangular flat molds (including a transparent substrate 1 and a transparent cover 5), a carbonate rock core slice, an adhesive, a PDMS film and bolts; wherein, the rectangular flat mold can be made of transparent materials such as PMMA, PC or glass, with a thickness of 2-4 mm, the carbonate rock is dolomite or marble, the thickness of the core slice 3 is 200-500 µm, the length and width are 0.5-1 mm smaller than the size of the groove 2, and the thickness must be greater than or equal to the depth of the groove 2, the surface of the core slice 3 is polished and smooth with a grinder, the adhesive can be epoxy glue or UV glue, and the thickness of the PDMS film 6 is 0.5-1 mm.

[0020] The principle of the present invention is as follows: the present invention etches the real pore structure into the carbonate rock core slice, not only simulating the real stratum pore structure in the pore channel, but also simulating the real geological environment of the stratum, so that the experimental results are closer to reality, and the viscoelasticity of the PDMS film 6 itself is used to make the PDMS film 6 perfectly fit on the upper surface of the etched core slice 3, and the viscoelasticity of the PDMS film 6 itself is that the upper and lower two transparent rectangular flat plate molds seal the chip and play the role of a gasket, and the light transmittance of the PDMS film 6 itself also ensures the visibility of the chip. The present invention can reproduce the real geological environment and pore structure on the microfluidic chip, and maintain a good visualization effect during the experiment.

[0021] The specific operations of the preparation method of the real carbonate rock microfluidic chip of the present invention are as follows: Punch a threaded hole on each of the four corners of two rectangular flat molds of the same size. One piece is used as the transparent substrate 1 and the other piece is used as the transparent cover 5. The thickness of the rectangular flat mold (i.e., the transparent substrate 1 and the transparent cover 5) is 2-4 mm. The material can be PMMA, PC, glass, etc. The positions of the threaded holes on the two rectangular flat molds must be completely consistent. Then use a laser marking machine to mark the transparent substrate 1 on one side (such as Figure 1A groove 2 is opened on the transparent substrate 1, the groove 2 is located in the middle of the transparent substrate 1, and the depth of the groove 2 is 200-500 µm, so as to obtain a real carbonate rock microfluidic chip base; a carbonate rock core is selected and sliced ​​to form a carbonate rock core slice, the carbonate rock is selected from dolomite or calcite, the thickness of the core slice 3 is 200-500 µm, the length and width are 0.5-1 mm smaller than the corresponding dimensions of the groove 2, the thickness of the core slice 3 must be greater than or equal to the depth of the groove 2, and the surface of the core slice 3 is polished and smoothed by a grinder; an adhesive is poured into the groove 2 of the real carbonate rock microfluidic chip base, the adhesive must completely cover the groove 2, and the adhesive can be selected from epoxy glue or UV glue; the core slice 3 is placed in the groove 2 of the core microfluidic chip base, and after the adhesive is cured, the surface of the core slice 3 is finely treated by a grinder to obtain a real carbonate rock microfluidic chip substrate, and there must be no bubbles after the adhesive is cured; a laser marking machine is used to mark the real A real pore channel and a liquid injection and outflow channel are etched on a core slice 3 on a substrate of a real carbonate microfluidic chip to obtain a semi-finished carbonate microfluidic chip, wherein the real pore channel image is obtained by digital image processing after CT scanning of the real core; a PDMS film 6 of the same size as the rectangular flat mold is taken, and holes are punched on the PDMS film 6 at the same punching position as the rectangular flat mold, and an inlet and outlet are punched on the PDMS film 6 for liquid inlet and outlet, and the thickness of the PDMS film 6 is 0.5-1 mm, the inlet and outlet positions on the PDMS film 6 must correspond to the positions of the liquid injection and outflow channels on the core slice 3; the PDMS film 6 with holes is covered on the semi-finished carbonate rock microfluidic chip to ensure that the holes are aligned, and no bubbles are required after the PDMS film 6 is covered; then the transparent cover sheet 5 is covered on the PDMS film 6 to ensure that the holes are aligned; a laser marking machine is used to punch holes on the transparent cover sheet 5 again for liquid injection and outflow, and the punching positions of the transparent cover sheet 5 when punching holes again need to be consistent with the inlet and outlet positions of the PDMS film 6, and the four corners of the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts to finally obtain a real carbonate rock microfluidic chip.

[0022] Compared with the existing technology, the significant advantage of the present invention is that the real pore channels of the formation are etched onto the real carbonate rock core slices, which can not only ensure the real geological environment and pore structure, but also retain the visualization of the experimental process. And because the chip uses the real geological core material, the experimental results will be more real and reliable.

[0023] Example 1 In this embodiment, a threaded hole is punched on each of the four corners of two rectangular glass plates with a length and width of 60×15 mm. One plate is used as a transparent substrate 1 and the other is used as a transparent cover plate 5. The thickness of the glass plate is 2 mm, and the positions of the threaded holes punched on the two glass plates are completely consistent. Then, a rectangular groove 2 is opened on one side of the transparent substrate 1 using a laser marking machine. The position of the groove 2 is located in the middle of the transparent substrate 1, and the length and width of the groove 2 are parallel to the length and width of the transparent substrate 1. The length and width of the groove 2 are 30×10 mm, and the depth is 200 μm, thereby obtaining a real carbonate rock microfluidic chip base. Dolomite is selected and sliced ​​to form a rectangular dolomite core slice. The thickness of the core slice 3 is 200 μm. µm, the length and width of the core slice 3 are 29.5×9.5mm, and the surface of the core slice 3 is polished and smoothed with a grinder; the adhesive is poured into the groove 2 of the base of the real carbonate rock microfluidic chip, and the adhesive must completely cover the groove 2, and the adhesive is epoxy glue; the core slice 3 is placed in the groove 2 of the base of the core microfluidic chip, and after the adhesive is cured, the surface of the core slice 3 is finely treated with a grinder to obtain a real carbonate rock microfluidic chip substrate, and there are no bubbles after the adhesive is cured; laser marking is used The machine etches the real pore channel and the liquid injection and outflow channel on the core slice 3 on the substrate of the real carbonate rock microfluidic chip to obtain a semi-finished carbonate rock microfluidic chip. The real pore channel image is obtained by digital image processing after CT scanning of the real core; a PDMS film 6 with a size of 60×15 mm is taken, and holes are punched on the PDMS film 6 at the same punching position as the rectangular flat mold, and an inlet and outlet are punched on the PDMS film 6 for liquid inlet and outlet. The thickness of the PDMS film 6 is 0.5 mm, the inlet and outlet positions on the PDMS film 6 correspond to the positions of the liquid injection and outflow channels on the core slice; the PDMS film 6 with holes is covered on the semi-finished carbonate rock microfluidic chip to ensure that the holes are aligned, and there should be no bubbles after the PDMS film 6 is covered; then the transparent cover sheet 5 is covered on the PDMS film 6 to ensure that the holes are aligned; a laser marking machine is used to punch holes on the transparent cover sheet 5 again for liquid injection and outflow, and the punching positions of the transparent cover sheet 5 are consistent with the inlet and outlet positions on the PDMS film 6 when the holes are punched again, and then the four corners of the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts, and finally a real carbonate rock microfluidic chip is obtained.

[0024] Figure 1 This is a schematic diagram of the base of the real carbonate rock microfluidic chip of this embodiment. It can be seen that a threaded hole 7 is punched at each of the four corners of the glass substrate, which is combined with a transparent cover plate 5 for chip packaging. A groove 2 is opened in the middle of the transparent substrate 1, and the groove 2 is used to place the core slice 3. Figure 2This is a schematic diagram of the semi-finished carbonate rock microfluidic chip of this embodiment. It can be seen that the core slice 3 has been fixed in the groove 2 of the glass substrate, and real formation pore channels and liquid inlet and outlet channels are etched on the core slice 3. The carbonate rock microfluidic chip has been initially formed.

[0025] Example 2 In this embodiment, a threaded hole is punched on each of the four corners of two rectangular PMMA plates with a length and width of 70×15 mm. One plate is used as a transparent substrate 1 and the other is used as a transparent cover plate 5. The thickness of the PMMA plate is 4 mm. The positions of the threaded holes punched on the two PMMA plates are completely consistent. Then, a rectangular groove 2 is opened on one side of the transparent substrate 1 using a laser marking machine. The position of the groove 2 is located in the middle of the transparent substrate 1. The length and width of the groove 2 are parallel to the length and width of the transparent substrate 1. The length and width of the groove 2 are 40×10 mm and the depth is 500 μm, thereby obtaining a real carbonate rock microfluidic chip base. Calcite is selected and sliced ​​to form a rectangular calcite core slice. The thickness of the core slice 3 is 500 μm. µm, the length and width of the core slice 3 are 29×9 mm, and the core slice 3 is polished and smoothed with a grinder; the adhesive is poured into the groove 2 of the base of the real carbonate rock microfluidic chip, and the adhesive must completely cover the groove 2, and the adhesive is UV glue; the core slice 3 is placed in the groove 2 of the base of the core microfluidic chip, and irradiated with a UV lamp. After the adhesive is cured, the surface of the core slice 3 is finely treated with a grinder to obtain a real carbonate rock microfluidic chip substrate. There are no bubbles after the adhesive is cured; laser The marking machine etches the real pore channel and the liquid injection and outflow channels on the core slice 3 on the substrate of the real carbonate rock microfluidic chip to obtain a semi-finished carbonate rock microfluidic chip. The real pore channel image is obtained by digital image processing after CT scanning of the real core; a PDMS film 6 with a size of 70×15 mm is taken, and holes are punched on the PDMS film 6 at the same punching position as the rectangular flat mold, and an inlet and outlet are punched on the PDMS film 6 for liquid in and out. The thickness of the PDMS film 6 is 1 mm, the inlet and outlet positions on the PDMS film 6 correspond to the positions of the liquid injection and outflow channels on the core slice 3; the PDMS film 6 with holes is covered on the semi-finished carbonate rock microfluidic chip to ensure that the holes are aligned, and there should be no bubbles after the PDMS film 6 is covered; then the transparent cover sheet 5 is covered on the PDMS film 6 to ensure that the holes are aligned; a laser marking machine is used to punch holes on the transparent cover sheet 5 again for liquid injection and outflow. When the transparent cover sheet 5 is punched again, the punching positions are consistent with the inlet and outlet positions on the PDMS film 6, and the four corners of the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts to finally obtain a real carbonate rock microfluidic chip.

[0026] Figure 3This is a schematic diagram of the overall structure of the real carbonate rock microfluidic chip based on this embodiment; it can be seen that the transparent substrate 1 is at the bottom, and after the real core (i.e., the core slice 3) is bonded to the groove 2 on the transparent substrate 1, the real core pore channel is etched on the surface of the core slice 3 by laser, and then covered with a PDMS film 6, and finally covered with a transparent cover sheet 5, and the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts to obtain a real carbonate rock microfluidic chip.

[0027] Example 3 In this embodiment, a threaded hole is punched on each of the four corners of two rectangular PMMA plates with a length and width of 80×15 mm. One plate is used as a transparent substrate and the other is used as a transparent cover plate 5. The thickness of the PMMA plate is 3 mm. The positions of the threaded holes punched on the two PMMA plates are completely consistent. Then, a groove 2 is opened on one side of the transparent substrate 1 using a laser marking machine. The position of the groove 2 is located in the middle of the transparent substrate 1. The length and width of the groove 2 are parallel to the length and width of the transparent substrate 1. The length and width of the groove 2 are 40×10 mm and the depth is 400 μm, thereby obtaining a real carbonate rock microfluidic chip base. A core is selected and sliced ​​to form a rectangular core slice 3. The thickness of the core slice 3 is 500 μm. µm, with a length and width of 29×9mm. The surface of the core slice 3 is polished and smoothed with a grinder. The adhesive is poured into the groove of the base of the real carbonate rock microfluidic chip. The adhesive must completely cover the groove 2. The adhesive is UV glue. The core slice 3 is placed in the groove 2 of the base of the core microfluidic chip and irradiated with a UV lamp. After the adhesive is cured, the surface of the core slice 3 is finely treated with a grinder to obtain a real carbonate rock microfluidic chip substrate. There are no bubbles after the adhesive is cured. A laser marking machine is used to mark the real carbonate rock microfluidic chip substrate. The real pore channel and the liquid injection and outflow channels are etched on the core slice 3 on the substrate of the real carbonate rock microfluidic chip to obtain a semi-finished carbonate rock microfluidic chip. The real pore channel image is obtained by digital image processing after CT scanning of the real core. A PDMS film 6 with a size of 80×15 mm is taken, and holes are punched on the PDMS film 6 at the same punching position as the rectangular flat mold, and an inlet and outlet are punched on the PDMS film 6 for liquid inlet and outlet. The thickness of the PDMS film 6 is 0.8 mm, the inlet and outlet positions on the PDMS film 6 correspond to the positions of the liquid injection and outflow channels on the core slice 3; the PDMS film 6 with holes is covered on the semi-finished carbonate rock microfluidic chip to ensure that the holes are aligned, and no bubbles should be ensured after the PDMS film 6 is covered; then the transparent cover sheet 5 is covered on the PDMS film 6 to ensure that the holes are aligned; a laser marking machine is used to punch holes on the transparent cover sheet again for liquid injection and outflow, and the punching positions of the transparent cover sheet 5 are consistent with the inlet and outlet positions of the PDMS film 6 when the holes are punched again, and the four corners of the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts, and finally a real carbonate rock microfluidic chip is obtained.

[0028] Example 4 In this embodiment, a threaded hole is punched on each of the four corners of two rectangular PMMA plates with a length and width of 60×15 mm. One plate is used as a transparent substrate and the other is used as a transparent cover plate 5. The thickness of the PMMA plate is 3 mm. The positions of the threaded holes punched on the two PMMA plates are completely consistent. Then, a groove 2 is opened on one side of the transparent substrate 1 using a laser marking machine. The position of the groove 2 is located in the middle of the transparent substrate 1. The length and width of the groove 2 are parallel to the length and width of the transparent substrate 1. The length and width of the groove 2 are 30×10 mm and the depth is 300 μm, thereby obtaining a real carbonate rock microfluidic chip base. A core is selected and sliced ​​to form a rectangular core slice 3. The thickness of the core slice 3 is 400 μm. µm, with a length and width of 29.2×9.2mm. The surface of the core slice 3 is polished and smoothed with a grinder. The adhesive is poured into the groove of the base of the real carbonate rock microfluidic chip. The adhesive must completely cover the groove 2. The adhesive is UV glue. The core slice 3 is placed in the groove 2 of the base of the core microfluidic chip and irradiated with a UV lamp. After the adhesive is cured, the surface of the core slice 3 is finely treated with a grinder to obtain a real carbonate rock microfluidic chip substrate. There are no bubbles after the adhesive is cured. Use a laser marking machine The real pore channel and the liquid injection and outflow channels are etched on the core slice 3 on the substrate of the real carbonate rock microfluidic chip to obtain a semi-finished carbonate rock microfluidic chip. The real pore channel image is obtained by digital image processing after CT scanning of the real core. A PDMS film 6 with a size of 60×15 mm is taken. The PDMS film 6 is punched at the same punching position as the rectangular flat mold, and an inlet and outlet are punched on the PDMS film 6 for liquid inlet and outlet. The thickness of the PDMS film 6 is 0.6 mm, the inlet and outlet positions on the PDMS film 6 correspond to the positions of the liquid injection and outflow channels on the core slice 3; the PDMS film 6 with holes is covered on the semi-finished carbonate rock microfluidic chip to ensure that the holes are aligned, and no bubbles should be ensured after the PDMS film 6 is covered; then the transparent cover sheet 5 is covered on the PDMS film 6 to ensure that the holes are aligned; a laser marking machine is used to punch holes on the transparent cover sheet again for liquid injection and outflow, and the punching positions of the transparent cover sheet 5 are consistent with the inlet and outlet positions of the PDMS film 6 when the holes are punched again, and the four corners of the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts, and finally a real carbonate rock microfluidic chip is obtained.

[0029] Example 5 In this embodiment, a threaded hole is punched on each of the four corners of two rectangular PMMA plates with a length and width of 60×15 mm. One plate is used as a transparent substrate and the other is used as a transparent cover plate 5. The thickness of the PMMA plate is 3 mm. The positions of the threaded holes punched on the two PMMA plates are completely consistent. Then, a groove 2 is opened on one side of the transparent substrate 1 using a laser marking machine. The position of the groove 2 is located in the middle of the transparent substrate 1. The length and width of the groove 2 are parallel to the length and width of the transparent substrate 1. The length and width of the groove 2 are 30×10 mm and the depth is 200 μm, thereby obtaining a real carbonate rock microfluidic chip base. A core is selected and sliced ​​to form a rectangular core slice 3. The thickness of the core slice 3 is 350 µm, with a length and width of 29.1×9.1mm. The surface of the core slice 3 is polished and smoothed with a grinder. The adhesive is poured into the groove of the base of the real carbonate rock microfluidic chip. The adhesive must completely cover the groove 2. The adhesive is UV glue. The core slice 3 is placed in the groove 2 of the base of the core microfluidic chip and irradiated with a UV lamp. After the adhesive is cured, the surface of the core slice 3 is finely treated with a grinder to obtain a real carbonate rock microfluidic chip substrate. There are no bubbles after the adhesive is cured. Use a laser marking machine A real pore channel and a liquid injection and outflow channel are etched on a core slice 3 on a real carbonate rock microfluidic chip substrate to obtain a semi-finished carbonate rock microfluidic chip. The real pore channel image is obtained by digital image processing after CT scanning of the real core. A PDMS film 6 with a size of 60×15 mm is taken. A hole is punched on the PDMS film 6 at the same punching position as the rectangular flat mold, and an inlet and outlet are punched on the PDMS film 6 for liquid inlet and outlet. The thickness of the PDMS film 6 is 0.5 mm, the inlet and outlet positions on the PDMS film 6 correspond to the positions of the liquid injection and outflow channels on the core slice 3; the PDMS film 6 with holes is covered on the semi-finished carbonate rock microfluidic chip to ensure that the holes are aligned, and no bubbles should be ensured after the PDMS film 6 is covered; then the transparent cover sheet 5 is covered on the PDMS film 6 to ensure that the holes are aligned; a laser marking machine is used to punch holes on the transparent cover sheet again for liquid injection and outflow, and the punching positions of the transparent cover sheet 5 are consistent with the inlet and outlet positions of the PDMS film 6 when the holes are punched again, and the four corners of the transparent substrate 1 and the transparent cover sheet 5 are fixed with bolts, and finally a real carbonate rock microfluidic chip is obtained.

[0030] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. A method for preparing a real carbonate rock microfluidic chip, characterized in that: The process includes the following: A binder is poured into the groove (2) on the prepared transparent substrate (1), and a core slice (3) is placed on the uncured binder surface in the groove (2). After the binder is cured, the surface of the core slice (3) is ground, and then a laser is used to pattern the surface of the core slice (3) to etch out a real pore channel image, a liquid injection channel, and a liquid outflow channel, thereby obtaining a semi-finished carbonate rock microfluidic chip; The surface of the semi-finished carbonate microfluidic chip is then covered with a PDMS film (6); the prepared transparent cover sheet (5) is covered on the surface of the PDMS film (6), and the transparent substrate (1), the PDMS film (6) and the transparent cover sheet (5) are fixedly connected to obtain the real carbonate microfluidic chip, wherein the transparent cover sheet (5) and the PDMS film (6) are both provided with a liquid inlet and a liquid outlet at positions corresponding to the liquid injection channel and the liquid outflow channel.

2. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: The radial dimension of the core slice (3) is smaller than the radial dimension of the groove (2), the thickness of the core slice (3) is greater than or equal to the depth of the groove (2), and the depth difference is 0-0.5 mm.

3. The method for preparing a real carbonate rock microfluidic chip according to claim 2, characterized in that: The core slice (3) is rectangular in shape, and the groove (2) is rectangular in shape; the length of the core slice (3) is 0.5-1 mm smaller than the length of the groove (2), and the width of the core slice (3) is 0.5-1 mm smaller than the width of the groove (2); the thickness of the core slice (3) is 200-500 µm, and the depth of the groove (2) is 200-500 µm.

4. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: When pouring the adhesive into the groove (2) on the transparent substrate (1), the adhesive is completely spread over the groove (2); the adhesive is epoxy glue or UV glue.

5. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: After the surface of the core slice (3) is ground, the surface of the core slice (3) and the transparent substrate (1) are flush and the surfaces are flat and smooth.

6. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: The real pore channel image is obtained by scanning the real core CT and then performing digital image processing.

7. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: The thickness of the PDMS film (6) is 0.5-1.0 mm.

8. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: The carbonate rock is selected from dolomite or marble.

9. The method for preparing a real carbonate rock microfluidic chip according to claim 1, characterized in that: The four corners of the transparent substrate (1), the PDMS film (6) and the transparent cover sheet (5) are fixedly connected to form an integrated structure by means of screws.

10. A real carbonate rock microfluidic chip, characterized in that: The real carbonate rock microfluidic chip is prepared by any one of the preparation methods of claims 1 to 9.

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