Sheet for laser confocal of oil-containing shale core and gluing equipment

Abstract

The invention discloses a sheet for laser confocal of an oil-containing shale core and gluing equipment, and relates to the technical field of shale experiments. The thin sheet is pasted on the glass slide, and the glass slide is provided with a gluing layer for sealing the thin sheet inside. The gluing equipment comprises a gluing box of a closed structure, an opening is formed in the front face of the gluing box, an opening and closing door is arranged in a matched mode, and the opening and closing door is in sealing fit with the opening of the gluing box. A workbench is arranged in the gluing box, a containing groove is formed in the middle of the workbench, the containing groove is used for containing a glass slide pasted with a shale sheet in a matched mode, a glue supply mechanism used for inputting glue into the containing groove is arranged in the gluing box, and a transverse displacement module is arranged over the containing groove; a trowelling plate used for trowelling glue is installed on a sliding block of the transverse displacement module. According to the method, the prepared shale rock slice is coated with the alpha-ethyl cyanoacrylate quick-setting gel, so that the storage time of hydrocarbons in the slice can be prolonged, and the laser confocal experiment result cannot be influenced.

Description

Technical Field

[0001] The invention relates to the technical field of shale experiment, in particular to a thin slice and glue coating equipment for laser confocal of oil-bearing shale core. Background Art

[0002] In recent years, my country's shale oil and gas exploration has achieved great success and has huge development potential. Chinese and foreign scholars have conducted a lot of research on the occurrence state of shale oil. Laser confocal microscopy is an important means to study the occurrence state of shale oil and the distribution of light and heavy hydrocarbons. It can intuitively qualitatively and quantitatively characterize the occurrence state characteristics of shale oil in the reservoir. Through laser confocal microscopy scanning observation, the sample can be described in detail, and the distribution position of crude oil components and its combination with minerals can be described, thereby improving the accuracy of reservoir movable fluid evaluation, which is of great significance in the development of shale oil and gas reservoirs.

[0003] At present, different wavelengths are selected as receiving wavelengths and displayed in different colors for the observation of rock minerals in samples, the observation of light components of crude oil in samples, and the observation of heavy components of crude oil in samples.

[0004] The current specific sample preparation process includes: slicing → dense gluing → polishing slices → sticking slices → grinding thin slices → labeling. The experimental center mainly observes non-volatile oils such as asphalt aromatics. Volatile oils such as saturated hydrocarbons are lost in large quantities during the sample preparation process.

[0005] The current preparation method does not take any sealing measures for the obtained thin slice samples. After a certain period of storage, the oil and gas signal becomes significantly weaker and can only be used once. When testing for the second time, it is necessary to prepare the slice again, resulting in waste of resources and increased testing costs.

[0006] Figure 7 Figure a is a laser confocal micrograph of light hydrocarbons taken after shale sample preparation in the prior art, and figure b is a laser confocal micrograph of light hydrocarbons taken after the sample was placed for one month after preparation; Figure 8 In the figure a is a laser confocal microscope photograph of heavy hydrocarbons taken after the production in the prior art, and in the figure b is a laser confocal microscope photograph of heavy hydrocarbons taken one month after the production. Two different areas of the sample were tested, and the light hydrocarbon loss in area 1 was 26%, and the heavy hydrocarbon loss was 39%, while the light hydrocarbon loss in area 2 was 41%, and the heavy hydrocarbon loss was 53%.

[0007] Therefore, there is an urgent need to invent a method for preparing thin slices that can maintain oil signals for a long time. This method should achieve the effect of prolonging the preservation time of hydrocarbons in the thin slices without affecting the results of laser confocal experiments. At present, there is no clear experimental method. Summary of the invention

[0008] The purpose of the present invention is to provide a thin slice for laser confocal analysis of oil-bearing shale cores, which can prolong the storage time of hydrocarbons in the thin slice without affecting the results of laser confocal analysis experiments.

[0009] The technical solution to achieve the above purpose is: a thin slice for laser confocal analysis of oil-bearing shale core, the thin slice is pasted on a glass slide, and is characterized in that: a glue layer is provided on the glass slide to seal the thin slice.

[0010] Furthermore, the coating layer adopts α-ethyl cyanoacrylate quick-gel.

[0011] Another object of the present invention is to provide a glue coating device for coating a glue layer, comprising a glue coating box of a closed structure, a vacuum pump installed on the top of the glue coating box, the vacuum pump is connected to the top of the glue coating box through a pipeline, an opening is provided on the front of the glue coating box, and a switch door is provided in cooperation, and the switch door is sealed with the opening of the glue coating box; A workbench is provided in the glue coating box, and a receiving groove is provided in the middle of the workbench. The receiving groove is used to accommodate the glass slide with the shale slice attached thereto, and the depth of the receiving groove is greater than the sum of the thickness of the shale slice and the glass slide; The glue coating box is provided with a glue supply mechanism for inputting glue into the containing groove, a lateral displacement module is provided directly above the containing groove, and a screed plate for smoothing the glue is installed on the slider of the lateral displacement module.

[0012] Furthermore, a lifting drive mechanism is installed at the bottom of the workbench, and the lifting drive mechanism includes a lifting drive. The output end of the lifting drive is connected to a lifting push plate that extends vertically upward into the receiving groove, and is connected to the lifting push plate. The bottom of the receiving groove is provided with a push plate groove for accommodating the lifting push plate. The lifting drive is used to drive the lifting push plate upward, thereby driving the glass slide that has been coated with glue to move upward out of the receiving groove.

[0013] Furthermore, a cleaning mechanism for cleaning glue on the trowel plate is provided on one side of the workbench.

[0014] Furthermore, the lower end of the trowel plate is configured to be a bent section bent to the right to be in a tilted downward state.

[0015] Furthermore, the cleaning mechanism is located on the left side of the accommodating groove, and includes a slot and a liquid collecting groove arranged side by side and connected to each other. The liquid collecting groove is located on the right side of the slot. A wiping strip is inserted in the slot, and the wiping strip protrudes upward from the slot. The top end of the wiping strip is set to an inclined surface parallel to the bending section of the squeegee, and the lower end of the wiping strip is aligned with the upper opening of the liquid collecting groove.

[0016] Furthermore, the wiping strip is made of rubber material, and a plurality of convex strips arranged in the longitudinal direction and arranged at intervals are provided on the inclined surface.

[0017] Furthermore, a horizontally arranged fixed mounting plate is fixedly provided on the slider of the vertical displacement module, the trowel plate is fixed to the bottom of the fixed mounting plate, the glue supply mechanism includes a glue storage box arranged on the fixed mounting plate, the bottom plate in the glue storage box is connected to a liquid outlet pipe passing downward through the fixed mounting plate, the liquid outlet pipe corresponds to the upper and lower positions of the accommodating groove on the workbench, and the liquid outlet pipe is connected to an electric control valve and a flow meter.

[0018] Furthermore, the liquid outlet pipe is located on the left side of the trowel plate, and the height of the lower end of the liquid outlet pipe is higher than the height of the high end of the bending section of the trowel plate.

[0019] Beneficial effects of the present invention: The present invention utilizes ethyl α-cyanoacrylate quick gel to coat the prepared shale rock slices, which can prolong the storage time of hydrocarbons in the slices without affecting the results of laser confocal experiments.

[0020] However, α-cyanoacrylate ethyl quick gel is very easy to solidify, and the coating cannot be applied thinly and evenly. A drop of α-cyanoacrylate ethyl quick gel solidifies in the air, making the surface of the thin slice undulating and containing bubbles. The α-cyanoacrylate ethyl quick gel that is too thick and contains bubbles distorts the result of laser confocal. Therefore, the present invention uses a smear plate to repeatedly scrape the glue under a vacuum environment to drive out the bubbles in the glue. At the same time, in a vacuum environment, since there is almost no participation of water molecules, α-cyanoacrylate ethyl quick gel is not easy to solidify, ensuring the effect of smearing. After smearing by the α-cyanoacrylate ethyl quick gel waterless smearing method, the hydrocarbons in the sample are well preserved. After the sample is placed for 3 months, the laser signal is the same as that of a freshly prepared thin slice. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a thin sheet for laser confocal microscopy of an oil-bearing shale core according to the present invention; Figure 2 It is the front view of the glue coating equipment; Figure 3 It is a structural schematic diagram of the glue coating equipment; Figure 4 It is a side view of the trowel plate in a smoothing state; Figure 5 A schematic diagram of a state in which a lifting drive drives a glass slide coated with glue to move upward out of a receiving groove; Figure 6 It is a structural schematic diagram of the cleaning state of the smear plate of the glue coating equipment; Figure 7 a is a laser confocal microphotograph of light hydrocarbons taken after the film was prepared in the prior art, and b is a laser confocal microphotograph of light hydrocarbons taken after the film was placed for 1 month after the film was prepared; Figure 8 a is a laser confocal microscope photo of heavy hydrocarbons taken after the film was prepared in the prior art, and b is a laser confocal microscope photo of heavy hydrocarbons taken one month after the film was prepared; Fig. 9 This is a photo of a thin slice surface coated with a layer of ethyl α-cyanoacrylate gel in air at room temperature and pressure, and superimposed with the rock and light and heavy hydrocarbon signals; Fig.10 The present invention is a photograph of a layer of ethyl α-cyanoacrylate quick-gel coated with the coating equipment of the present invention and superimposed with rock and light hydrocarbon and heavy hydrocarbon signals. DETAILED DESCRIPTION

[0022] like Figure 1 As shown, the present invention discloses a thin slice for laser confocal of oil-bearing shale core, wherein the thin slice 1 is pasted on a glass slide 2, and the thin slice 1 is obtained by sequentially slicing the shale core → densely gluing → polishing the slice → pasting the slice → grinding, which belongs to the existing conventional technology, and the glass slide 2 is provided with a glue layer 3 for sealing the thin slice 1, and the glue layer 3 adopts α-ethyl cyanoacrylate quick-gelling agent.

[0023] like Figure 2-6 As shown, the present invention also discloses a glue coating device for coating a glue layer 3, comprising a glue coating box 4 with a closed structure, the front of the glue coating box 4 is provided with an opening and a switch door 5, and the switch door 5 is sealed with the opening of the glue coating box 4.

[0024] A workbench 6 is provided in the glue coating box 4, and a receiving groove 7 is provided in the middle of the workbench 6. The receiving groove 7 is used to accommodate the glass slide 2 with the thin slice 1 pasted thereon. The depth of the receiving groove 7 is greater than the sum of the thickness of the shale thin slice 1 and the glass slide 2. The specific depth is set by those skilled in the art according to the thickness of the glue coating layer, and the thickness of the glue coating layer is generally 1-5 mm.

[0025] A vacuum pump 27 is installed on the top of the glue coating box 4, and the vacuum pump 27 is connected to the top of the glue coating box 4 through a pipe 28. A first electric control valve 8 is connected in series to the pipe 28. A pressure gauge 9 for monitoring the internal cavity pressure of the glue coating box 4 is also installed on the top of the glue coating box 4.

[0026] A lateral displacement module 10 is installed directly above the accommodating groove 7, and a vertical displacement module 11 is installed on the slider of the lateral displacement module 10. A horizontally arranged fixed mounting plate 12 is fixedly provided on the slider of the vertical displacement module 11. A trowel plate 13 is fixedly installed vertically downward and corresponding to the upper and lower positions of the accommodating groove 7 at the bottom of the fixed mounting plate 12. The length b of the trowel plate 13 is greater than the width c of the accommodating groove 7. The lower end of the trowel plate 13 is provided with a bending section 14 bent to the right to be inclined downward. The angle between the bending section 14 and the horizontal plane is a, and a=20-30°.

[0027] A glue supply mechanism is also installed on the fixed mounting plate 12, and the glue supply mechanism includes a glue storage box 15 arranged on the fixed mounting plate 12. The bottom of the glue storage box 15 is fixedly connected with a liquid outlet pipe 16 that passes downward through the fixed mounting plate 12. The liquid outlet pipe 16 corresponds to the upper and lower positions of the accommodating groove 7 on the workbench 6. The liquid outlet pipe 16 is connected to a second electric control valve 17 and a flow meter 18. The liquid outlet pipe 16 is located on the left side of the trowel plate 13, and the lower end height of the liquid outlet pipe 16 is higher than the height of the high end of the trowel plate bending section 14.

[0028] A cleaning mechanism for cleaning glue on the bending section 14 of the trowel plate is also provided on the workbench on the left side of the accommodating groove 7. The cleaning mechanism includes a slot 19 and a liquid collecting tank 20 which are arranged side by side and connected to each other. The liquid collecting tank 20 is located on the right side of the slot 19. The liquid collecting tank 20 and the slot 19 are simultaneously located on the running track of the trowel plate 13 in the left and right directions. A wiping strip 21 made of rubber material is inserted into the slot 19. The longitudinal length of the wiping strip 21 is greater than the length b of the trowel plate 13. The wiping strip 21 protrudes upward from the slot 19. The top end of the wiping strip 21 is arranged as an inclined surface 22 which is parallel to the bending section 14 of the trowel plate. The inclined surface 22 is provided with a plurality of longitudinally arranged convex strips 23 arranged at intervals, and the lower end is aligned with the opening of the liquid collecting tank 20.

[0029] A lifting drive mechanism is installed at the bottom of the workbench 6 just below the receiving groove 7, and the lifting drive mechanism includes a lifting drive 24. The lifting drive 24 can be but is not limited to a cylinder. The output end of the lifting drive 24 is connected to a lifting push plate 25 that extends vertically upward into the receiving groove 7. The bottom of the receiving groove 7 is provided with a push plate groove 26 for accommodating the lifting push plate 25. The lifting drive 24 is used to drive the lifting push plate 25 upward, thereby driving the glue-coated glass slide to move upward out of the receiving groove 7.

[0030] As a further improvement, the length and width of the lifting and pushing plate 25 are slightly smaller than the length and width of the accommodating groove 7, so as to stably support the glass slide after the glue coating.

[0031] The working process of the glue coating equipment of the present invention is as follows: 1) Place the glass slide 2 with the shale slice 1 attached to it in the receiving tank 7, close the switch door 5, open the first electric control valve 8, start the vacuum pump 27 until the pressure in the glue coating box 4 drops to -0.1Mpa, and then close the vacuum pump 27 and the first electric control valve 8.

[0032] 2) The vertical displacement module 11 drives the trowel plate 13 upward to form a gap with the workbench 6, and opens the second electric control valve 17. The lateral displacement module 10 drives the liquid outlet pipe 16 to move back and forth along the receiving groove 7, and evenly inputs the glue liquid into the receiving groove 7 along the left and right directions, and controls the input amount to be slightly larger than the remaining volume in the receiving groove 7. After the glue liquid reaches the set amount, the second control valve 17 is closed.

[0033] 3) The lateral displacement module 10 drives the trowel plate 13 to move to the right side of the receiving groove 7, and at the same time, the vertical displacement module 11 drives the trowel plate 13 to fit on the workbench 6, and then the lateral displacement module 10 drives the trowel plate 13 to the left to scrape the glue in the receiving groove 7; To ensure the leveling effect, the leveling can be repeated many times. After each leveling is completed, the vertical displacement module 11 drives the trowel plate 13 to move in mid-air to the right side of the receiving groove 7, and then the vertical displacement module 11 drives the trowel plate 13 to fit on the workbench 6, and finally the horizontal displacement module 10 drives the trowel plate 13 to the left to level the glue in the receiving groove 7.

[0034] 4) After the scraping is completed, the lateral displacement module 10 drives the bending section 14 to move to the right side of the accommodating groove 7, and at the same time the vertical displacement module 11 drives the trowel plate 13 to fit on the workbench 6, and then the lateral displacement module 10 drives the trowel plate 13 to the left to scrape the glue remaining on the workbench into the liquid collecting tank 20; Then, the lateral displacement module 10 cooperates with the vertical displacement module 11 to drive the bent section 14 of the squeegee plate 13 to slide to the upper left along the convex strip 23 on the wiping strip 21 and scrape off the sticky glue liquid, and the scraped glue liquid flows into the liquid collecting tank 20 .

[0035] 5) The switch door 5 is opened, air enters, and the glue begins to solidify. When the switch door 5 is opened and the glue has not completely solidified, the lifting driver 24 drives the slide glass coated with glue to leave the receiving groove 7 upward.

[0036] Fig. 9 A layer of ethyl α-cyanoacrylate quick gel was coated on the surface of the thin slice in air at room temperature and pressure, and the rock and light and heavy hydrocarbon signals were superimposed. Fig. 9 It can be seen that the coating of ethyl α-cyanoacrylate quick gel in the air makes the coating too thick. The ethyl α-cyanoacrylate quick gel solidifies too quickly, and it is impossible to eliminate bubbles and control the thickness of the coating. Many bubbles can be seen.

[0037] Fig.10 The photograph is a photo of a layer of ethyl α-cyanoacrylate quick gel coated by the coating equipment of the present invention and superimposed with signals of rock and light hydrocarbons and heavy hydrocarbons. It can be seen from the figure that the ethyl α-cyanoacrylate quick gel of the present invention is coated evenly without bubbles.

Claims

1. A thin sheet for laser confocal imaging of oil-bearing shale core, the thin sheet is pasted on a glass slide, characterized in that: The glass slide is provided with a glue coating layer for sealing the thin slice.

2. The thin sheet for laser confocal analysis of oil-bearing shale core according to claim 1, characterized in that: The coating layer adopts α-ethyl cyanoacrylate quick-gel.

3. A glue coating device for coating glue on thin slices for laser confocal analysis of shale cores as claimed in claim 1, comprising a glue coating box with a closed structure, a vacuum pump is installed on the top of the glue coating box, the vacuum pump is connected to the top of the glue coating box through a pipeline, an opening is provided on the front of the glue coating box, and a switch door is provided in cooperation, and the switch door is sealed with the opening of the glue coating box; A workbench is provided in the glue coating box, and a receiving groove is provided in the middle of the workbench. The receiving groove is used to accommodate the glass slide with the shale slice attached thereto, and the depth of the receiving groove is greater than the sum of the thickness of the shale slice and the glass slide; The glue coating box is provided with a glue supply mechanism for inputting glue into the containing groove, a lateral displacement module is provided directly above the containing groove, and a screed plate for smoothing the glue is installed on the slider of the lateral displacement module.

4. The gluing device according to claim 3, characterized in that: A lifting drive mechanism is installed at the bottom of the workbench, and the lifting drive mechanism includes a lifting drive. The output end of the lifting drive is connected to a lifting push plate that extends vertically upward into the receiving groove, and is connected to a lifting push plate. The bottom of the receiving groove is provided with a push plate groove for accommodating the lifting push plate. The lifting drive is used to drive the lifting push plate upward, thereby driving the glue-coated glass slide to move upward out of the receiving groove.

5. The gluing device according to claim 3, characterized in that: A cleaning mechanism for cleaning glue on the trowel plate is arranged on one side of the workbench.

6. The gluing device according to claim 3, characterized in that: The lower end of the trowel plate is arranged to be bent to the right side to form a bending section in an inclined downward state.

7. The gluing device according to claim 5, characterized in that: The cleaning mechanism is located on the left side of the accommodating groove, and includes a slot and a liquid collecting groove arranged side by side and connected to each other. The liquid collecting groove is located on the right side of the slot. A wiping strip is inserted in the slot, and the wiping strip protrudes upward from the slot. The top end of the wiping strip is set as an inclined surface parallel to the bending section of the squeegee, and the lower end of the wiping strip is aligned with the upper opening of the liquid collecting groove.

8. The gluing device according to claim 5, characterized in that: The wiping strip is made of rubber, and a plurality of convex strips arranged in the longitudinal direction and arranged at intervals are arranged on the inclined surface.

9. The gluing device according to claim 7, characterized in that: A horizontally arranged fixed mounting plate is fixedly provided on the slider of the vertical displacement module, the trowel plate is fixed on the bottom of the fixed mounting plate, the glue supply mechanism includes a glue storage box arranged on the fixed mounting plate, the bottom plate in the glue storage box is connected with a liquid outlet pipe passing downward through the fixed mounting plate, the liquid outlet pipe corresponds to the upper and lower positions of the accommodating groove on the workbench, and the liquid outlet pipe is connected with an electric control valve and a flow meter.

10. The gluing device according to claim 9, characterized in that: The liquid outlet pipe is located on the left side of the trowel plate, and the height of the lower end of the liquid outlet pipe is higher than the height of the high end of the bending section of the trowel plate.

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