A shale spontaneous imbibition detection device and method of use thereof

Abstract

The application belongs to the technical field and discloses a shale spontaneous imbibition detection device and a use method thereof. The shale spontaneous imbibition detection device comprises a main shell, a clamping assembly, a containing box, an image module and a weight detection module. The clamping assembly is arranged in the main shell and is used for clamping and fixing a shale sample. The containing box is provided with a containing chamber for storing isotopic imbibition liquid. The lower end of the shale sample extends into the containing chamber and is in contact with the liquid level of the isotopic imbibition liquid. The image module is arranged in the main shell. The image module comprises a nuclear magnetic resonance device, a radionuclide imaging device and a ray scanning imaging device which are arranged in a vertical interval. The three devices are circumferentially arranged outside the shale sample and can move vertically. The weight detection module is arranged on the clamping assembly. The device is used for detecting the spontaneous imbibition of shale, the dynamic imbibition process of shale at a microscopic scale can be obtained, and the influence of the imbibition amount of pores of different sizes on the imbibition process can be quantitatively analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum engineering, and in particular to a shale spontaneous imbibition detection device and a use method thereof. Background Art

[0002] Shale is a porous medium, and its pore structure often contains rich oil and gas resources. When extracting oil and gas from shale, fracturing fluid must be infiltrated into the pore structure of the shale, either naturally or artificially, to displace the oil and gas stored there. Understanding the pore structure of shale can better understand the storage state and migration patterns of oil and gas in shale reservoirs, providing a theoretical basis for shale oil and gas extraction. Spontaneous imbibition experiments are an important method for studying the pore structure and porous media characteristics of shale reservoirs. They help understand the microstructure and fluid dynamics of porous media. Based on the experimental results, shale oil and gas extraction plans can be optimized, thereby increasing the recovery rate of shale oil and gas.

[0003] Existing shale spontaneous imbibition experiments typically use nuclear magnetic resonance (NMR) and computed tomography (CT) scanning to determine the amount of spontaneous imbibition and the pore structure of the shale. However, these techniques can only determine the total imbibition amount and static pore structure of the shale under macroscopic conditions. They are unable to quantitatively analyze the impact of imbibition amounts of pores of different diameters on the overall imbibition behavior at the microscopic scale, nor can they reveal the dynamic imbibition process and imbibition pathways of the shale. Summary of the Invention

[0004] The purpose of the present invention is to provide a shale spontaneous imbibition detection device and a method for using the same, which can obtain the dynamic imbibition process and imbibition path of shale at the microscopic scale, and can also obtain the imbibition amount of pore structures of different sizes, so as to quantitatively analyze the influence of the imbibition amount of pore structures of different sizes on the overall imbibition behavior.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a shale spontaneous imbibition detection device is provided, comprising:

[0007] main housing;

[0008] a clamping assembly disposed in the main housing, the clamping assembly being configured to clamp and fix a shale sample;

[0009] a containing box, the containing box being provided with a containing chamber, the containing chamber being configured to store an isotope imbibition liquid, the lower end of the shale sample extending into the containing chamber and contacting a liquid surface of the isotope imbibition liquid, the isotope imbibition liquid comprising a plurality of radioactive isotopes with different half-lives;

[0010] an imaging module disposed in the main housing, the imaging module comprising a nuclear magnetic resonance device, a radionuclide imaging device, and a ray scanning imaging device arranged vertically at intervals, the nuclear magnetic resonance device, the radionuclide imaging device, and the ray scanning imaging device all being circumferentially disposed outside the shale sample and all being vertically movable so that the radionuclide imaging device or the ray scanning imaging device scans the shale sample from top to bottom;

[0011] A weight detection module is provided on the clamping assembly, and is used to detect the weight of the shale sample.

[0012] Optionally, the imaging module further includes a mounting base, a first gear and a first rack, the mounting base being arranged on the inner wall of the main shell, the first gear being rotatably arranged on the mounting base, the first rack being arranged on the side walls of the nuclear magnetic resonance device, the radionuclide imaging device and the ray scanning imaging device, and extending vertically, and the first gear being engaged with the first rack.

[0013] Optionally, the clamping assembly includes a connecting rod, a clamping shell and a telescopic tightening member, one end of the connecting rod is connected to the clamping shell, and the other end is arranged on the top wall of the main shell, the connecting rod extends vertically, and at least part of the shale sample can be extended into the clamping shell, the telescopic tightening member is telescopically arranged on the side wall of the clamping shell in the horizontal direction, and the telescopic tightening member can tighten the side wall of the shale sample so that the clamping shell clamps and fixes the shale sample.

[0014] Optionally, the shale spontaneous imbibition detection device also includes a temperature control unit arranged in the main shell, the temperature control unit includes a temperature detection part, a temperature adjustment part and a temperature control module, the temperature detection part is used to detect the temperature inside the main shell, the temperature detection part and the temperature adjustment part are both communicated with the temperature control module, and the temperature adjustment part is used to adjust the internal temperature of the main shell to a preset temperature.

[0015] Optionally, the shale spontaneous imbibition detection device also includes a humidity control unit arranged in the main shell, the humidity control unit includes a humidity detection component, a humidity adjustment component and a humidity control module, the humidity detection component is used to detect the humidity inside the main shell, the humidity detection component and the humidity adjustment component are both communicatively connected to the humidity control module, and the humidity adjustment component is used to adjust the internal humidity of the main shell to a preset humidity.

[0016] Optionally, the ray scanning imaging device includes a first shell, a frame, a second rack, a second gear, a ray emitting element, a ray detecting element and a signal processing device. The first shell is circumferentially arranged on the outside of the shale sample, the second gear is rotatably arranged on the first shell, the frame is arranged on the side of the first shell facing the shale sample, the second rack is arranged on the frame, and the second gear and the second rack are meshed with each other. The ray emitting element and the ray detecting element are circumferentially spaced on the side of the frame facing the shale sample. The ray detecting element is used to detect the rays emitted by the ray emitting element. The ray emitting element is communicatively connected to the signal processing device to convert the rays into ray scanning imaging images.

[0017] Optionally, the nuclear magnetic resonance equipment includes a main magnet, a nuclear magnetic resonance analyzer and a nuclear magnetic resonance induction coil. The nuclear magnetic resonance analyzer is circumferentially arranged on the outside of the shale sample. The main magnet is arranged on the side of the nuclear magnetic resonance analyzer facing the shale sample to generate a magnetic field. The nuclear magnetic resonance induction coil is arranged on the side of the main magnet facing the shale sample, and the nuclear magnetic resonance induction coil is communicatively connected to the nuclear magnetic resonance analyzer so that the nuclear magnetic resonance analyzer receives and processes the resonance signal.

[0018] In a second aspect, a method for using a shale spontaneous imbibition detection device is provided, wherein the shale spontaneous imbibition detection device as described above is used, and the method for using the shale spontaneous imbibition detection device comprises the following steps:

[0019] S1. Prepare and process shale samples;

[0020] S2. Clamp the shale sample on a clamping assembly, and control the nuclear magnetic resonance device, the radionuclide imaging device, and the radiographic scanning imaging device to move vertically to detect an initial nuclear magnetic resonance signal intensity, an initial radionuclide imaging image, and an initial radiographic scanning imaging image of the shale sample, and detect an initial weight of the shale sample;

[0021] S3, preparing an isotope imbibition liquid, and storing the isotope imbibition liquid in the receiving chamber of the receiving box;

[0022] S4. placing a holding box below the shale sample and adjusting the vertical height of the shale sample so that the lower end of the shale sample extends into the holding chamber of the holding box and contacts the liquid surface of the isotope imbibition solution, so that the shale sample generates spontaneous imbibition;

[0023] S5. Whenever the spontaneous imbibition of the shale sample continues for a first preset time, controlling the nuclear magnetic resonance device, the radionuclide imaging device, and the radiographic scanning imaging device to move vertically to detect the nuclear magnetic resonance signal intensity, the radionuclide imaging image, and the radiographic scanning imaging image of the shale sample at the current moment, and detecting the weight of the shale sample at the current moment;

[0024] S6. Determine whether the weight difference between two adjacent tests of the shale sample is less than or equal to 0.01 g. If so, proceed to S7. If not, repeat step S5 to obtain the nuclear magnetic resonance signal intensity, radionuclide imaging image, X-ray scanning imaging image, and mass of the shale sample at multiple moments.

[0025] S7. Collect and process all detection data and images, and analyze the spontaneous imbibition process of the shale sample.

[0026] Optionally, step S1 specifically includes the following steps:

[0027] S11. Selecting a suitable shale sample from the shale reservoir and cutting the shale sample into a preset size;

[0028] S12, cleaning the shale sample and checking whether there are cracks and impurities on the surface of the shale sample. If not, proceed to step S13; if so, repeat step S11;

[0029] S13, performing oil washing treatment on the shale sample;

[0030] S14, injecting deionized water into the shale sample until the shale sample reaches a saturated state, and detecting the nuclear magnetic resonance signal intensity of the shale sample in the saturated state;

[0031] S15, placing the shale sample in a vacuum drying oven, adjusting the vacuum drying oven to a preset temperature, and drying the shale sample at the preset temperature for a second preset time.

[0032] Optionally, step S5 specifically includes the following steps:

[0033] S51, setting a first preset interval time, and when the spontaneous imbibition time of the shale sample is equal to the first preset interval time, controlling the nuclear magnetic resonance device, the radionuclide imaging device, and the radiographic scanning imaging device to move vertically to detect the nuclear magnetic resonance signal intensity, the radionuclide imaging image, and the radiographic scanning imaging image of the shale sample at the current moment, and detecting the weight of the shale sample at the current moment;

[0034] S52. Calculate the imbibition rate of the shale sample based on the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the X-ray scanning imaging image, and the weight of the shale sample, and draw a graph of the imbibition rate of the shale sample;

[0035] S53, judging whether the spontaneous imbibition of the shale sample is in the late imbibition stage according to the imbibition rate curve, if so, proceeding to step S54, if not, repeating step S51;

[0036] S54. Set a second preset interval time. When the spontaneous imbibition time of the shale sample is equal to the second preset interval time, control the nuclear magnetic resonance device, the radionuclide imaging device and the X-ray scanning imaging device to move vertically to detect the nuclear magnetic resonance signal intensity, radionuclide imaging image and X-ray scanning imaging image of the shale sample at the current moment, and detect the weight of the shale sample at the current moment.

[0037] Beneficial effects of the present invention:

[0038] The present invention provides a shale spontaneous imbibition detection device and a method for using the same. The shale spontaneous imbibition detection device includes a main shell, a clamping assembly, a containing box, an imaging module, and a weight detection module. When the shale spontaneous imbibition detection device is used to detect the spontaneous imbibition process of shale, a shale sample is first prepared and clamped on the clamping assembly, and a nuclear magnetic resonance device, a radionuclide imaging device, and a ray scanning imaging device are controlled to move vertically, thereby obtaining the initial nuclear magnetic resonance signal intensity, the initial radionuclide imaging image, and the initial ray scanning imaging image of the shale sample in its initial state, and detecting the initial mass of the shale sample at the same time; then, the prepared isotope imbibition liquid is stored in the containing chamber of the containing box, and the vertical height of the shale sample is adjusted so that its lower end extends into the containing chamber and contacts with the isotope imbibition liquid, thereby triggering the spontaneous imbibition phenomenon of the shale sample; whenever the shale sample spontaneously After the spontaneous imbibition is performed for a first preset time, the nuclear magnetic resonance device, the radionuclide imaging device and the radiographic scanning imaging device are controlled to move vertically, thereby obtaining the nuclear magnetic resonance signal intensity, the radionuclide imaging image and the radiographic scanning imaging image of the shale sample at the current moment, and simultaneously detecting the weight of the shale sample at the current moment; determining whether the difference in weight of the shale samples between two adjacent tests is less than or equal to 0.01 g; if not, repeating the above operation to obtain the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the radiographic scanning imaging image and the mass of the shale sample at multiple moments; if so, stopping the test, collecting and processing all the test data and images, and analyzing the spontaneous imbibition process of the shale sample.

[0039] The shale sample is brought into contact with an isotope imbibition fluid to cause spontaneous imbibition, thereby allowing the isotope imbibition fluid containing radioactive isotopes with multiple half-lives to enter the pore structure of the shale sample. At the same time, the shale sample at multiple imbibition moments is scanned using a radionuclide imaging device to obtain radionuclide imaging images at each moment of the spontaneous imbibition process, thereby obtaining the dynamic imbibition process and imbibition path of the shale sample at the microscopic scale; the shale sample at multiple imbibition moments is scanned using a radiographic scanning imaging device to obtain radiographic scanning imaging images, thereby obtaining detailed information on the pore structure of the shale sample. At the same time, combined with the magnetic resonance signal intensity and radionuclide imaging image of the shale sample at the same moment, the imbibition amount of pore structures of different sizes can be calculated, thereby quantitatively analyzing the influence of the imbibition amount of pore structures of different sizes on the overall imbibition behavior. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a first view of the shale spontaneous imbibition detection device provided in Example 1 of the present invention;

[0041] Figure 2 This is a second view of the shale spontaneous imbibition detection device provided in the first embodiment of the present invention;

[0042] Figure 3 This is a third view of the shale spontaneous imbibition detection device provided in the first embodiment of the present invention;

[0043] Figure 4 This is a first flow chart of a method for using the shale spontaneous imbibition detection device provided in the second embodiment of the present invention;

[0044] Figure 5 This is the second flow chart of the method for using the shale spontaneous imbibition detection device provided in the second embodiment of the present invention.

[0045] In the picture:

[0046] 100. Shale samples;

[0047] 1. Main shell;

[0048] 2. Clamping assembly; 21. Connecting rod; 22. Clamping housing;

[0049] 3. accommodating box; 31. accommodating chamber;

[0050] 4. Imaging module; 41. Nuclear magnetic resonance device; 411. Main magnet; 412. Nuclear magnetic resonance analyzer; 413. Nuclear magnetic resonance induction coil; 42. Radionuclide imaging device; 43. X-ray scanning imaging device; 431. First housing; 432. Frame; 433. Second rack; 435. X-ray emitting element; 436. X-ray detecting element; 44. Mounting base; 45. First gear; 46. First rack;

[0051] 5. Weight detection module;

[0052] 6. Temperature control unit; 61. Temperature detection element; 62. Temperature adjustment element;

[0053] 7. Humidity control unit; 71. Humidity detection element; 72. Humidity adjustment element. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0055] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0056] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0057] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0058] Example 1

[0059] This embodiment provides a shale spontaneous imbibition detection device, such as Figures 1 to 3 As shown, the dynamic imbibition process and imbibition path of shale at the microscopic scale can be obtained, and the imbibition amount of pore structures of different sizes can be obtained, so that the influence of pore structures of different sizes on the overall imbibition behavior can be quantitatively analyzed.

[0060] like Figures 1 to 3 As shown, the shale spontaneous imbibition detection device includes a main shell 1, a clamping assembly 2, a receiving box 3, an imaging module 4 and a weight detection module 5. The clamping assembly 2 is arranged in the main shell 1, and the clamping assembly 2 is configured to clamp and fix the shale sample 100. The receiving box 3 is provided with a receiving chamber 31, and the receiving chamber 31 is configured to store an isotope imbibition liquid. The lower end of the shale sample 100 extends into the receiving chamber 31 and contacts the liquid surface of the isotope imbibition liquid. The isotope imbibition liquid includes a plurality of radioactive isotopes with different half-lives. Since the lower end of the shale sample 100 contacts the isotope imbibition liquid, the shale sample 100 generates a spontaneous imbibition phenomenon, that is, under the action of the capillary force of the pore structure of the shale sample 100, the isotope imbibition liquid will enter the pores of the shale sample 100. The imaging module 4 is disposed within the main housing 1 and includes a nuclear magnetic resonance (NMR) device 41, a radionuclide imaging device 42, and a radiographic scanning imaging device 43, which are arranged vertically and spaced apart. The NMR device 41, radionuclide imaging device 42, and radiographic scanning imaging device 43 are all circumferentially arranged around the outside of the shale sample 100 and are each vertically movable, enabling the radionuclide imaging device 42 or the radiographic scanning imaging device 43 to scan the shale sample 100 from top to bottom, thereby obtaining complete and continuous radionuclide imaging or radiographic scanning images of the shale sample 100. A weight detection module 5 is disposed on the clamping assembly 2 and is used to detect the weight of the shale sample 100.

[0061] When the shale spontaneous imbibition detection device is used to detect the spontaneous imbibition process of shale, a shale sample 100 is first prepared and clamped on the clamping assembly 2, and the nuclear magnetic resonance device 41, the radionuclide imaging device 42 and the ray scanning imaging device 43 are controlled to move vertically, so as to obtain the initial nuclear magnetic resonance signal intensity, the initial radionuclide imaging image and the initial ray scanning imaging image of the shale sample 100 in the initial state, and at the same time detect the initial mass of the shale sample 100; then the prepared isotope imbibition liquid is stored in the accommodating chamber 31 of the accommodating box 3, and the vertical height of the shale sample 100 is adjusted so that its lower end extends into the accommodating chamber 31 and contacts with the isotope imbibition liquid, thereby triggering the spontaneous imbibition phenomenon of the shale sample 100; whenever the shale sample After the spontaneous imbibition of the shale sample 100 has proceeded for a first preset time, the nuclear magnetic resonance device 41, the radionuclide imaging device 42, and the radiographic scanning imaging device 43 are controlled to move vertically, thereby obtaining the nuclear magnetic resonance signal intensity, radionuclide imaging image, and radiographic scanning imaging image of the shale sample 100 at the current moment, and simultaneously detecting the weight of the shale sample 100 at the current moment; determining whether the difference between the weights of the shale sample 100 detected in two adjacent times is less than or equal to 0.01 g; if not, repeating the above operation to obtain the nuclear magnetic resonance signal intensity, radionuclide imaging image, radiographic scanning imaging image, and mass of the shale sample 100 at multiple moments; if so, stopping the detection, collecting and processing all detection data and images, and analyzing the spontaneous imbibition process of the shale sample 100.

[0062] The shale sample 100 is brought into contact with an isotope imbibition fluid to cause spontaneous imbibition, thereby allowing the isotope imbibition fluid containing radioactive isotopes with multiple different half-lives to enter the pore structure of the shale sample 100. At the same time, the radionuclide imaging device 42 is used to scan the shale sample 100 at multiple imbibition moments, thereby obtaining radionuclide imaging images at each moment of the spontaneous imbibition process, and thus obtaining the dynamic imbibition process and imbibition path of the shale sample 100 at the microscopic scale; the shale sample 100 at multiple imbibition moments is scanned using a ray scanning imaging device 43 to obtain ray scanning imaging images, and thus obtain detailed information on the pore structure of the shale sample 100. At the same time, combined with the magnetic resonance signal intensity and radionuclide imaging image of the shale sample 100 at the same time, the imbibition amount of pore structures of different sizes can be calculated, thereby quantitatively analyzing the influence of the imbibition amount of pore structures of different sizes on the overall imbibition behavior.

[0063] Exemplarily, the radionuclide imaging device 42 includes a PET device and the like, and the weight detection module 5 includes a weight sensor and the like.

[0064] Alternatively, as Figures 1 to 3As shown, the imaging module 4 further includes a mounting base 44, a first gear 45, and a first rack 46. The mounting base 44 is mounted on the inner wall of the main housing 1, and the first gear 45 is rotatably mounted on the mounting base 44. The first rack 46 is mounted on the side walls of the MRI device 41, the radionuclide imaging device 42, and the X-ray scanning imaging device 43, and extends vertically. The first gear 45 meshes with the first rack 46. When it is necessary to detect the spontaneous imbibition process of the shale sample 100, the first gear 45 is driven to rotate. Since the first gear 45 is engaged with the first rack 46, the rack will drive the nuclear magnetic resonance device 41, the radionuclide imaging device 42 and the ray scanning imaging device 43 to move vertically, so that the radionuclide imaging device 42 or the ray scanning imaging device 43 scans the shale sample 100 from top to bottom, and obtains a complete and continuous radionuclide imaging image or ray scanning imaging image of the shale sample 100. The structure is simple and easy to operate. The vertical height of the radionuclide imaging device 42 and the ray scanning imaging device 43 can be flexibly adjusted, which is convenient for detecting the radionuclide imaging image and ray scanning imaging image of the shale sample 100 at any time during the spontaneous imbibition process, which is conducive to obtaining the dynamic imbibition process and imbibition path of the shale sample 100.

[0065] It should be noted that the nuclear magnetic resonance device 41 does not need to scan the shale sample 100 from top to bottom. As long as the shale sample 100 is within the magnetic field range of the nuclear magnetic resonance device 41, it can be detected.

[0066] Alternatively, as Figures 1 to 3 As shown, the clamping assembly 2 includes a connecting rod 21, a clamping housing 22, and a telescopic tensioning member. One end of the connecting rod 21 is connected to the clamping housing 22, and the other end is mounted on the top wall of the main housing 1. The connecting rod 21 extends vertically, allowing at least a portion of the shale sample 100 to extend into the clamping housing 22. The telescopic tensioning member is telescopically mounted on the sidewall of the clamping housing 22, pressing against the sidewall of the shale sample 100 to secure the shale sample 100 in the clamping housing 22. When fixing the shale sample 100, the shale sample 100 is extended into the clamping shell 22. At this time, the shale sample 100 will push the telescopic tightening member, so that the telescopic tightening member generates a reverse thrust on the shale sample 100, thereby tightening the side wall of the shale sample 100, so that the clamping shell 22 clamps and fixes the shale sample 100. The structure is simple and easy to operate. When the shale sample 100 needs to undergo spontaneous imbibition, the vertical height of the shale sample 100 can also be adjusted to partially enter or partially move out of the clamping shell 22, so that the lower end of the shale sample 100 is in contact with the isotope imbibition liquid.

[0067] Exemplarily, the telescopic pressing member includes a spring push rod and the like.

[0068] Alternatively, as Figure 2 and Figure 3 As shown, the shale spontaneous imbibition detection device also includes a temperature control unit 6 and a humidity control unit 7 arranged in the main shell 1. Among them, the temperature control unit 6 includes a temperature detection part 61, a temperature adjustment part 62 and a temperature control module. The temperature detection part 61 is used to detect the temperature inside the main shell 1, and the temperature detection part 61 and the temperature adjustment part 62 are both communicatively connected to the temperature control module. The temperature adjustment part 62 is used to adjust the internal temperature of the main shell 1 to a preset temperature. After the temperature detection part 61 detects the internal temperature of the main shell 1, it will transmit a signal to the temperature control module. The temperature control module receives the signal transmitted by the temperature detection part 61 to obtain the temperature information detected by it. When the temperature is higher or lower than the preset temperature, the temperature control module will send an instruction to make the temperature adjustment part 62 perform cooling or heating work until the temperature detection part 61 detects that the internal temperature of the main shell 1 is equal to the preset temperature.

[0069] The humidity control unit 7 includes a humidity sensor 71, a humidity adjustment member 72, and a humidity control module. The humidity sensor 71 is used to detect the humidity inside the main housing 1. Both the humidity sensor 71 and the humidity adjustment member 72 are in communication with the humidity control module. The humidity adjustment member 72 is used to adjust the internal humidity of the main housing 1 to a preset humidity. After the humidity sensor 71 detects the internal humidity of the main housing 1, it transmits a signal to the humidity control module. The humidity control module receives the signal transmitted by the humidity sensor 71 and obtains the detected humidity information. When the humidity is higher or lower than the preset humidity, the humidity control module sends a command to the humidity adjustment member 72 to perform drying or humidification until the humidity sensor 71 detects that the internal humidity of the main housing 1 is equal to the preset humidity.

[0070] Illustratively, the temperature detecting member 61 includes a temperature monitoring sensor, and the humidity detecting member 71 includes a humidity monitoring sensor.

[0071] Alternatively, as Figures 1 to 3As shown, the radiographic scanning imaging device 43 includes a first housing 431, a frame 432, a second rack 433, a second gear, a radiation emitting element 435, a radiation detecting element 436, and a signal processing device. The first housing 431 is circumferentially disposed around the outside of the shale sample 100, and the second gear is rotatably mounted on the first housing 431. The frame 432 is disposed around the side of the first housing 431 facing the shale sample 100, and the second rack 433 is disposed around the frame 432. The second gear and the second rack 433 are meshed. The radiation emitting element 435 and the radiation detecting element 436 are circumferentially spaced apart on the side of the frame 432 facing the shale sample 100. The radiation detecting element 436 is used to detect radiation emitted by the radiation emitting element 435. The radiation emitting element 435 is in communication with the signal processing device to convert the radiation into an image. When performing X-ray scanning imaging on the shale sample 100, the second gear is driven to rotate. Since the second gear is engaged with the second rack 433, the second rack 433 will drive the frame 432 to rotate vertically, and at the same time control the X-ray emitting element 435 to emit rays. The rays will penetrate the shale sample 100 and be received by the X-ray detection element 436 and converted into electrical signals. The electrical signals will then be transmitted to the signal processing equipment, and after being processed by the signal processing equipment, a X-ray scanning imaging image will be generated.

[0072] Exemplarily, the radiation scanning imaging device 43 includes a CT device or the like.

[0073] Alternatively, as Figures 1 to 3 As shown, the NMR device 41 includes a main magnet 411, an NMR analyzer 412, and an NMR induction coil 413. The NMR analyzer 412 is circumferentially arranged outside the shale sample 100. The main magnet 411 is located on the side of the NMR analyzer 412 facing the shale sample 100 and is used to generate a magnetic field. The NMR induction coil 413 is located on the side of the main magnet 411 facing the shale sample 100 and is communicatively connected to the NMR analyzer 412 so that the NMR analyzer 412 receives and processes resonance signals. The main magnet 411 generates a static magnetic field. Under the action of the static magnetic field, the shale sample 100 is magnetized. At the same time, the nuclear magnetic resonance analyzer 412 emits radio frequency pulses and acts on the shale sample 100, causing the shale sample 100 to absorb energy and release a resonance signal. The nuclear magnetic resonance induction coil 413 then receives the resonance signal released by the shale sample 100 and transmits the resonance signal to the nuclear magnetic resonance analyzer 412, thereby obtaining the nuclear magnetic resonance signal intensity.

[0074] Exemplarily, the nuclear magnetic resonance device 41 includes an NMR device.

[0075] Example 2

[0076] This embodiment provides a method for using a shale spontaneous imbibition detection device, using the shale spontaneous imbibition detection device described above. Figure 4 As shown, the method for using the shale spontaneous imbibition detection device includes the following steps:

[0077] S1. Prepare and process a shale sample 100;

[0078] S2. Clamp the shale sample 100 on the clamping assembly 2, and control the nuclear magnetic resonance device 41, the radionuclide imaging device 42, and the radiographic scanning imaging device 43 to move vertically to detect the initial nuclear magnetic resonance signal intensity, initial radionuclide imaging image, and initial radiographic scanning imaging image of the shale sample 100, and detect the initial weight of the shale sample 100;

[0079] S3, preparing an isotope imbibition liquid and storing the isotope imbibition liquid in the receiving chamber 31 of the receiving box 3;

[0080] S4. Place the holding box 3 below the shale sample 100 and adjust the vertical height of the shale sample 100 so that the lower end of the shale sample 100 extends into the holding chamber 31 and contacts the liquid surface of the isotope imbibition liquid, so that the shale sample 100 undergoes spontaneous imbibition.

[0081] S5. Whenever the spontaneous imbibition of the shale sample 100 lasts for a first preset time, the nuclear magnetic resonance device 41, the radionuclide imaging device 42, and the radiographic scanning imaging device 43 are controlled to move vertically to detect the nuclear magnetic resonance signal intensity, the radionuclide imaging image, and the radiographic scanning imaging image of the shale sample 100 at the current moment, and to detect the weight of the shale sample 100 at the current moment;

[0082] S6. Determine whether the weight difference between two adjacent tests of the shale sample 100 is less than or equal to 0.01 g. If so, proceed to S7. If not, repeat step S5 to obtain the nuclear magnetic resonance signal intensity, radionuclide imaging image, X-ray scanning imaging image, and mass of the shale sample 100 at multiple time points.

[0083] S7. Collect and process all detection data and images, and analyze the spontaneous imbibition process of the shale sample 100.

[0084] When detecting the spontaneous imbibition process of shale, first prepare a shale sample 100 and clamp it on the clamping assembly 2, control the nuclear magnetic resonance device 41, the radionuclide imaging device 42 and the ray scanning imaging device 43 to move vertically, so as to obtain the initial nuclear magnetic resonance signal intensity, the initial radionuclide imaging image and the initial ray scanning imaging image of the shale sample 100 in the initial state, and detect the initial mass of the shale sample 100 at the same time; then store the prepared isotope imbibition liquid in the containing chamber 31 of the containing box 3, and adjust the vertical height of the shale sample 100 so that its lower end extends into the containing chamber 31 and contacts with the isotope imbibition liquid, thereby triggering the spontaneous imbibition phenomenon of the shale sample 100; whenever the shale sample 100 spontaneously imbibs After the imbibition is performed for a first preset time, the nuclear magnetic resonance device 41, the radionuclide imaging device 42 and the radiographic scanning imaging device 43 are controlled to move vertically, thereby obtaining the nuclear magnetic resonance signal intensity, radionuclide imaging image and radiographic scanning imaging image of the shale sample 100 at the current moment, and at the same time detecting the weight of the shale sample 100 at the current moment; determining whether the difference between the weights of the shale samples 100 detected twice is less than or equal to 0.01 g; if not, repeating the above operation to obtain the nuclear magnetic resonance signal intensity, radionuclide imaging image, radiographic scanning imaging image and mass of the shale sample 100 at multiple moments; if so, stopping the detection, collecting and processing all the detection data and images, and analyzing the spontaneous imbibition process of the shale sample 100.

[0085] In step S7, by collecting images of the radionuclide imaging device 42 of the shale sample 100 at multiple imbibition moments, the dynamic imbibition process and imbibition path of the shale sample 100 at the microscopic scale can be obtained; the magnetic resonance signal intensity, the radionuclide imaging device 42 image and the radionuclide imaging image at the same moment can be used to calculate the imbibition amount of pore structures of different sizes, thereby quantitatively analyzing the influence of the imbibition amount of pore structures of different sizes on the overall imbibition behavior.

[0086] When necessary, relevant parameters are substituted into the following formulas (1)-(3) to quantitatively analyze the effect of the imbibition amount of pore structures of different sizes on the overall imbibition behavior.

[0087]

[0088]

[0089] S (r，t) =f (r，t) ×S t (3)

[0090] Among them, f (r,t) is the contribution coefficient of the pore channel with radius r at time t; C r(t) is the concentration of radioactive isotopes in the pore channel with a radius of r at time t; n is the total number of pore channels with a radius of r; C total (t) represents the total concentration of radioactive isotopes in the shale sample 100 at time t; t is the nuclear magnetic resonance intensity at time t; I0 ​​is the nuclear magnetic resonance intensity in the initial state; I sat is the NMR intensity after the imbibition is completed.

[0091] Alternatively, as Figure 5 As shown, step S1 specifically includes the following steps:

[0092] S11. Selecting a suitable shale sample 100 from the shale reservoir and cutting the shale sample 100 into a preset size;

[0093] S12, cleaning the shale sample 100 and checking whether there are cracks and impurities on the surface of the shale sample 100, if not, proceed to step S13, if yes, repeat step S11;

[0094] S13, performing oil washing treatment on the shale sample 100;

[0095] S14, injecting deionized water into the shale sample 100 until the shale sample 100 reaches a saturated state, and detecting the nuclear magnetic resonance signal intensity of the shale sample 100 in the saturated state;

[0096] S15, placing the shale sample 100 in a vacuum drying oven, adjusting the vacuum drying oven to a preset temperature, and drying the shale sample 100 at the preset temperature for a second preset time.

[0097] In this embodiment, the preset dimensions of the shale sample 100 are 2.5 cm in diameter and 4 cm in length, the preset temperature is 60°C, and the second preset time is 24 hours. Drying the shale sample 100 ensures that no residual liquid or volatiles remain in its pores, thereby ensuring the integrity and accuracy of its spontaneous imbibition process.

[0098] Alternatively, as Figure 5 As shown, step S5 specifically includes the following steps:

[0099] S51: Setting a first preset interval time, and when the spontaneous imbibition time of the shale sample 100 is equal to the first preset interval time, controlling the nuclear magnetic resonance device 41, the radionuclide imaging device 42, and the radiographic scanning imaging device 43 to move vertically to detect the nuclear magnetic resonance signal intensity, the radionuclide imaging image, and the radiographic scanning imaging image of the shale sample 100 at the current moment, and detecting the weight of the shale sample 100 at the current moment;

[0100] S52. Calculate the imbibition rate of the shale sample 100 based on the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the X-ray scanning imaging image, and the weight of the shale sample 100, and draw a graph of the imbibition rate of the shale sample 100.

[0101] S53, judging whether the spontaneous imbibition of the shale sample 100 is in the late imbibition stage according to the imbibition rate curve, if so, proceed to step S54, if not, repeat step S51;

[0102] S54. Set a second preset interval time. When the spontaneous imbibition time of the shale sample 100 is equal to the second preset interval time, control the nuclear magnetic resonance device 41, the radionuclide imaging device 42 and the X-ray scanning imaging device 43 to move vertically to detect the nuclear magnetic resonance signal intensity, radionuclide imaging image and X-ray scanning imaging image of the shale sample 100 at the current moment, and detect the weight of the shale sample 100 at the current moment.

[0103] It should be noted that when the line of the imbibition rate curve of the shale sample 100 is a straight line segment, the spontaneous imbibition of the shale sample 100 is in the early imbibition stage; when the line is a curve segment, the spontaneous imbibition of the shale sample 100 is in the late imbibition stage, and the first preset interval time is less than the second preset interval time.

[0104] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A shale spontaneous imbibition detection device, characterized in that: include: Main shell (1); A clamping assembly (2) is disposed in the main housing (1), and the clamping assembly (2) is configured to clamp and fix a shale sample (100); A containing box (3), the containing box (3) being provided with a containing chamber (31), the containing chamber (31) being configured to store an isotope imbibition liquid, the lower end of the shale sample (100) extending into the containing chamber (31) and contacting the liquid surface of the isotope imbibition liquid, the isotope imbibition liquid comprising a plurality of radioactive isotopes with different half-lives; An imaging module (4) is disposed in the main housing (1), the imaging module (4) comprising a nuclear magnetic resonance device (41), a radionuclide imaging device (42), and a ray scanning imaging device (43) arranged at intervals along a vertical direction, the nuclear magnetic resonance device (41), the radionuclide imaging device (42), and the ray scanning imaging device (43) all being circumferentially arranged outside the shale sample (100), and all being able to move vertically so that the radionuclide imaging device (42) or the ray scanning imaging device (43) scans the shale sample (100) from top to bottom; A weight detection module (5) is provided on the clamping assembly (2), and the weight detection module (5) is used to detect the weight of the shale sample (100); The imaging module (4) further comprises a mounting base (44), a first gear (45) and a first rack (46), wherein the mounting base (44) is arranged on the inner wall of the main housing (1), the first gear (45) is rotatably arranged on the mounting base (44), the first rack (46) is arranged on the side walls of the nuclear magnetic resonance device (41), the radionuclide imaging device (42) and the ray scanning imaging device (43), and extends vertically, and the first gear (45) is meshed with the first rack (46); The ray scanning imaging device (43) includes a first shell (431), a frame (432), a second rack (433), a second gear, a ray emitting element (435), a ray detecting element (436) and a signal processing device, wherein the first shell (431) is circumferentially arranged on the outside of the shale sample (100), the second gear is rotatably arranged on the first shell (431), the frame (432) is arranged on the side of the first shell (431) facing the shale sample (100), and the second gear is rotatably arranged on the first shell (431). The rack (433) is annularly arranged on the frame (432), and the second gear and the second rack (433) are meshed with each other. The ray emitting element (435) and the ray detecting element (436) are circumferentially spaced apart and arranged on a side of the frame (432) facing the shale sample (100). The ray detecting element (436) is used to detect the ray emitted by the ray emitting element (435). The ray emitting element (435) is communicatively connected with the signal processing device to convert the ray into a ray scanning imaging image. The nuclear magnetic resonance device (41) includes a main magnet (411), a nuclear magnetic resonance analyzer (412) and a nuclear magnetic resonance induction coil (413). The nuclear magnetic resonance analyzer (412) is circumferentially arranged on the outside of the shale sample (100). The main magnet (411) is arranged on the side of the nuclear magnetic resonance analyzer (412) facing the shale sample (100) for generating a magnetic field. The nuclear magnetic resonance induction coil (413) is arranged on the side of the main magnet (411) facing the shale sample (100), and the nuclear magnetic resonance induction coil (413) is communicatively connected to the nuclear magnetic resonance analyzer (412) so that the nuclear magnetic resonance analyzer (412) receives and processes the resonance signal.

2. The shale spontaneous imbibition detection device according to claim 1, characterized in that: The clamping assembly (2) includes a connecting rod (21), a clamping shell (22) and a telescopic pressing member. One end of the connecting rod (21) is connected to the clamping shell (22), and the other end is arranged on the top wall of the main shell (1). The connecting rod (21) extends vertically, and at least a portion of the shale sample (100) can extend into the clamping shell (22). The telescopic pressing member is telescopically arranged on the side wall of the clamping shell (22) in a horizontal direction. The telescopic pressing member can press the side wall of the shale sample (100) so that the clamping shell (22) clamps and fixes the shale sample (100).

3. The shale spontaneous imbibition detection device according to any one of claims 1-2, characterized in that: The shale spontaneous imbibition detection device further comprises a temperature control unit (6) arranged in the main housing (1), the temperature control unit (6) comprising a temperature detecting element (61), a temperature regulating element (62) and a temperature control module, the temperature detecting element (61) being used to detect the temperature inside the main housing (1), the temperature detecting element (61) and the temperature regulating element (62) being both communicatively connected to the temperature control module, and the temperature regulating element (62) being used to regulate the internal temperature of the main housing (1) to a preset temperature.

4. The shale spontaneous imbibition detection device according to any one of claims 1-2, characterized in that: The shale spontaneous imbibition detection device further comprises a humidity control unit (7) arranged in the main housing (1), the humidity control unit (7) comprising a humidity detection component (71), a humidity adjustment component (72) and a humidity control module, the humidity detection component (71) being used to detect the humidity inside the main housing (1), the humidity detection component (71) and the humidity adjustment component (72) being communicatively connected to the humidity control module, and the humidity adjustment component (72) being used to adjust the internal humidity of the main housing (1) to a preset humidity.

5. A method for using a shale spontaneous imbibition detection device, using the shale spontaneous imbibition detection device according to any one of claims 1 to 4, characterized in that: The method for using the shale spontaneous imbibition detection device comprises the following steps: S1. Prepare and process shale samples (100); S2, clamping the shale sample (100) on the clamping assembly (2), controlling the nuclear magnetic resonance device (41), the radionuclide imaging device (42), and the ray scanning imaging device (43) to move vertically to detect the initial nuclear magnetic resonance signal intensity, initial radionuclide imaging image, and initial ray scanning imaging image of the shale sample (100), and detecting the initial weight of the shale sample (100); S3, preparing an isotope imbibition liquid, and storing the isotope imbibition liquid in the receiving chamber (31) of the receiving box (3); S4, placing the containing box (3) below the shale sample (100), adjusting the vertical height of the shale sample (100) so that the lower end of the shale sample (100) extends into the containing chamber (31) of the containing box (3), and the lower end of the shale sample (100) contacts the liquid surface of the isotope imbibition liquid, so that the shale sample (100) generates spontaneous imbibition; S5. Whenever the spontaneous imbibition of the shale sample (100) lasts for a first preset time, controlling the nuclear magnetic resonance device (41), the radionuclide imaging device (42), and the ray scanning imaging device (43) to move vertically to detect the nuclear magnetic resonance signal intensity, the radionuclide imaging image, and the ray scanning imaging image of the shale sample (100) at the current moment, and detecting the weight of the shale sample (100) at the current moment; S6, determining whether the weight difference between two adjacent tests of the shale sample (100) is less than or equal to 0.01 g, and if so, proceeding to S7, and if not, repeating step S5 to obtain the nuclear magnetic resonance signal intensity, radionuclide imaging image, X-ray scanning imaging image, and mass of the shale sample (100) at multiple moments; S7. Collect and process all detection data and images, and analyze the spontaneous imbibition process of the shale sample (100).

6. The method for using the shale spontaneous imbibition detection device according to claim 5, characterized in that: The step S1 specifically includes the following steps: S11, selecting a suitable shale sample (100) from a shale reservoir, and cutting the shale sample (100) into a preset size; S12, cleaning the shale sample (100), and checking whether there are cracks and impurities on the surface of the shale sample (100), if not, proceeding to step S13, if yes, repeating step S11; S13, performing oil washing treatment on the shale sample (100); S14, injecting deionized water into the shale sample (100) until the shale sample (100) reaches a saturated state, and detecting the nuclear magnetic resonance signal intensity of the shale sample (100) in the saturated state; S15, placing the shale sample (100) in a vacuum drying oven, adjusting the vacuum drying oven to a preset temperature, and drying the shale sample (100) at the preset temperature for a second preset time.

7. The method for using the shale spontaneous imbibition detection device according to claim 5, characterized in that: The step S5 specifically includes the following steps: S51, setting a first preset interval time, and when the spontaneous imbibition time of the shale sample (100) is equal to the first preset interval time, controlling the nuclear magnetic resonance device (41), the radionuclide imaging device (42), and the ray scanning imaging device (43) to move vertically to detect the nuclear magnetic resonance signal intensity, the radionuclide imaging image, and the ray scanning imaging image of the shale sample (100) at the current moment, and detecting the weight of the shale sample (100) at the current moment; S52, calculating the imbibition rate of the shale sample (100) based on the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the X-ray scanning imaging image, and the weight of the shale sample (100), and drawing a graph of the imbibition rate of the shale sample (100); S53, judging whether the spontaneous imbibition of the shale sample (100) is in the late imbibition stage according to the imbibition rate curve, if so, proceeding to step S54, if not, repeating step S51; S54. Set a second preset interval time. When the spontaneous imbibition time of the shale sample (100) is equal to the second preset interval time, control the nuclear magnetic resonance device (41), the radionuclide imaging device (42) and the ray scanning imaging device (43) to move vertically to detect the nuclear magnetic resonance signal intensity, radionuclide imaging image and ray scanning imaging image of the shale sample (100) at the current moment, and detect the weight of the shale sample (100) at the current moment.

Images