Shale spontaneous imbibition detection device and use method thereof

Abstract

The invention 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 used for clamping and fixing a shale sample. The containing box is provided with a containing cavity used for storing isotope imbibition liquid, the lower end of the shale sample extends into the containing cavity and makes contact with the liquid level of the isotope imbibition liquid, and the image module is arranged in the main shell. The image module comprises nuclear magnetic resonance equipment, radionuclide imaging equipment and ray scanning imaging equipment which are arranged at intervals in the vertical direction, and the nuclear magnetic resonance equipment, the radionuclide imaging equipment and the ray scanning imaging equipment are annularly arranged on the outer side of the shale sample in the circumferential direction and can move in the vertical direction. The weight detection module is arranged on the clamping assembly. When the device is used for detecting the spontaneous imbibition of the shale, the dynamic imbibition process of the shale under the microscopic scale can be obtained, and the influence of the imbibition amounts of pores with 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 rich oil and gas resources are often stored in the pore structure of shale. When extracting oil and gas from shale, the fracturing fluid needs to be infiltrated into the pore structure of the shale through natural or artificial drive, so as to replace the oil and gas stored in the pore structure. By understanding the pore structure of shale, we can better understand the storage state and migration law of oil and gas in shale reservoirs, so as to provide a theoretical basis for the extraction of shale oil and gas. Spontaneous imbibition experiment is an important means to study the pore structure of shale reservoirs and the characteristics of porous media. It helps to understand the microstructure and fluid dynamics characteristics of porous media. According to the experimental results, the extraction plan of shale oil and gas can be optimized, thereby improving the extraction rate of shale oil and gas.

[0003] Existing shale spontaneous imbibition experiments usually use nuclear magnetic resonance (NMR) and computed tomography (CT) to scan the shale, and the spontaneous imbibition amount and pore structure of the shale can be obtained based on the test results. However, the above technical means can only obtain the total imbibition amount of shale and the static pore structure of shale under macroscopic conditions, and cannot quantitatively analyze the impact of the imbibition amount of pores with different pore sizes on the overall imbibition behavior at a microscopic scale, and cannot obtain the dynamic imbibition process and imbibition path of 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 a microscopic scale, and can 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, and configured to clamp and fix a shale sample;

[0009] A containing box, wherein the containing box is provided with a containing chamber, wherein the containing chamber is configured to store an isotope imbibition liquid, wherein the lower end of the shale sample extends into the containing chamber and contacts with the liquid surface of the isotope imbibition liquid, wherein the isotope imbibition liquid includes a plurality of radioactive isotopes with different half-lives;

[0010] An imaging module is arranged in the main housing, and includes a nuclear magnetic resonance device, a radionuclide imaging device, and a ray scanning imaging device arranged in a vertical interval, wherein the nuclear magnetic resonance device, the radionuclide imaging device, and the ray scanning imaging device are all arranged circumferentially outside the shale sample, and are all able to move vertically, 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 disposed 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 meshed 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 extend into the clamping shell, and 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 component, a temperature adjustment component and a temperature control module, the temperature detection component is used to detect the temperature inside the main shell, the temperature detection component and the temperature adjustment component are both communicatively connected to the temperature control module, and the temperature adjustment component 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 radiation scanning imaging device includes a first shell, a frame, a second rack, a second gear, a radiation emitting element, a radiation 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, the radiation emitting element and the radiation detecting element are circumferentially spaced on the side of the frame facing the shale sample, the radiation detecting element is used to detect the radiation emitted by the radiation emitting element, and the radiation emitting element is communicatively connected to the signal processing device to convert the radiation into a radiation scanning imaging image.

[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, and is used 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, using the shale spontaneous imbibition detection device as described above, and the method for using the shale spontaneous imbibition detection device comprises the following steps:

[0019] S1. Prepare and process shale samples;

[0020] S2, clamping the shale sample on the clamping assembly, controlling the nuclear magnetic resonance device, the radionuclide imaging device and the ray scanning imaging device to move vertically to detect the initial nuclear magnetic resonance signal intensity, the initial radionuclide imaging image and the initial ray scanning imaging image of the shale sample, and detecting the initial weight of the shale sample;

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

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

[0023] S5. Whenever the spontaneous imbibition of the shale sample lasts for a first preset time, the nuclear magnetic resonance device, the radionuclide imaging device and the ray scanning imaging device are controlled 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 at the current moment, and to detect the weight of the shale sample at the current moment;

[0024] S6, determining whether the weight difference of the shale sample detected in two adjacent times 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 times;

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

[0026] Optionally, the 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 yes, 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, the step S5 specifically includes the following steps:

[0033] S51, setting a first preset interval time, 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 ray scanning imaging device 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 at the current moment, and detecting the weight of the shale sample at the current moment;

[0034] S52, calculating the imbibition rate of the shale sample according to the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the X-ray scanning imaging image and the weight of the shale sample, and drawing a curve 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, the radionuclide imaging image and the 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, 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 in the initial state, and detect 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 first preset time of imbibition, the nuclear magnetic resonance device, the radionuclide imaging device and the ray scanning imaging device are controlled to move vertically, so as to obtain the nuclear magnetic resonance signal intensity, the radionuclide imaging image and the ray scanning imaging image of the shale sample at the current moment, and at the same time detect the weight of the shale sample at the current moment; determine whether the difference in weight of the shale samples detected in two adjacent times is less than or equal to 0.01g, if not, repeat the above operation, so as to obtain the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the ray scanning imaging image and the quality of the shale sample at multiple moments, if so, stop the detection, collect and process all the detection data and images, and analyze the spontaneous imbibition process of the shale sample.

[0039] The shale sample is brought into contact with an isotope imbibition solution to cause spontaneous imbibition, thereby allowing the isotope imbibition solution containing radioactive isotopes with different 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 a microscopic scale. The shale sample at multiple imbibition moments is scanned using a ray scanning imaging device to obtain ray 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 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a first view of the shale spontaneous imbibition detection device provided in the first embodiment 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 a shale spontaneous imbibition detection device provided in Embodiment 2 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 figure:

[0046] 100. Shale samples;

[0047] 1. Main shell;

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

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

[0050] 4. imaging module; 41. nuclear magnetic resonance equipment; 411. main magnet; 412. nuclear magnetic resonance analyzer; 413. nuclear magnetic resonance induction coil; 42. radionuclide imaging equipment; 43. ray scanning imaging equipment; 431. first shell; 432. frame; 433. second rack; 435. ray emitting element; 436. 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 in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0057] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0058] Embodiment 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 as to quantitatively analyze the influence of pore structures of different sizes on the overall imbibition behavior.

[0060] like Figures 1 to 3 As shown, the shale spontaneous imbibition detection device includes a main shell 1, a clamping assembly 2, a containing box 3, an imaging module 4 and a weight detection module 5. Among them, 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 containing box 3 is provided with a containing chamber 31, and the containing chamber 31 is configured to store an isotope imbibition liquid. The lower end of the shale sample 100 extends into the containing 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 produces a spontaneous imbibition phenomenon, that is, under 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 arranged in the main housing 1, and includes a nuclear magnetic resonance device 41, a radionuclide imaging device 42, and a ray scanning imaging device 43 arranged at intervals along the vertical direction. The nuclear magnetic resonance device 41, the radionuclide imaging device 42, and the ray scanning imaging device 43 are all arranged circumferentially outside the shale sample 100, and can be moved vertically, so that the radionuclide imaging device 42 or the ray scanning imaging device 43 scans the shale sample 100 from top to bottom, thereby obtaining a complete and continuous radionuclide imaging image or ray scanning imaging image of the shale sample 100. The weight detection module 5 is arranged 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, firstly, a shale sample 100 is 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 containing chamber 31 of the containing box 3, and the vertical height of the shale sample 100 is adjusted so that the lower end of the shale sample 100 extends into the containing chamber 31 and contacts with the isotope imbibition liquid, thereby inducing the spontaneous imbibition phenomenon of the shale sample 100; whenever the shale sample After the spontaneous imbibition of 100 has been carried out for a first preset time, 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 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 at the same time detect the weight of the shale sample 100 at the current moment; determine whether the difference between the weights of the shale samples 100 detected in two adjacent times is less than or equal to 0.01g, if not, repeat the above operation, so as to obtain the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the ray scanning imaging image and the quality of the shale sample 100 at multiple moments, if so, stop the detection, collect and process all the detection data and images, and analyze the spontaneous imbibition process of the shale sample 100.

[0062] The shale sample 100 is brought into contact with an isotope imbibition liquid to cause spontaneous imbibition, thereby allowing the isotope imbibition liquid containing radioactive isotopes of various 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 the dynamic imbibition process and imbibition path of the shale sample 100 at a microscopic scale can be obtained; the shale sample 100 at multiple imbibition moments is scanned using a ray scanning imaging device 43, and a ray scanning imaging image can be obtained, thereby obtaining detailed information on the pore structure of the shale sample 100. At the same time, combined with the magnetic resonance signal intensity and the 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, if 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 disposed on the inner wall of the main housing 1, and the first gear 45 is rotatably disposed on the mounting base 44. The first rack 46 is disposed 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. The first gear 45 is meshed 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 meshed 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, and the vertical height of the radionuclide imaging device 42 and the ray scanning imaging device 43 can be flexibly adjusted, so as to facilitate the detection of the radionuclide imaging image and the ray scanning imaging image of the shale sample 100 at any time during the spontaneous imbibition process, which is beneficial to obtain 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, if Figures 1 to 3 As shown, the clamping assembly 2 includes a connecting rod 21, a clamping shell 22 and a telescopic top tightening 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 part of the shale sample 100 can extend into the clamping shell 22. The telescopic top tightening member is telescopically arranged on the side wall of the clamping shell 22 in the horizontal direction, and the telescopic top tightening member can tighten the side wall of the shale sample 100, so that the clamping shell 22 clamps and fixes the shale sample 100. 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 force 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 infiltration, 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 tensioning member includes a spring push rod or the like.

[0068] Alternatively, if 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 component 61, a temperature adjustment component 62 and a temperature control module. The temperature detection component 61 is used to detect the temperature inside the main shell 1, and the temperature detection component 61 and the temperature adjustment component 62 are both communicatively connected to the temperature control module. The temperature adjustment component 62 is used to adjust the internal temperature of the main shell 1 to a preset temperature. After the temperature detection component 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 component 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 component 62 perform cooling or heating until the temperature detection component 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 detection component 71, a humidity adjustment component 72 and a humidity control module. The humidity detection component 71 is used to detect the humidity inside the main housing 1. The humidity detection component 71 and the humidity adjustment component 72 are both connected to the humidity control module in communication. The humidity adjustment component 72 is used to adjust the internal humidity of the main housing 1 to a preset humidity. After the humidity detection component 71 detects the internal humidity of the main housing 1, it will transmit a signal to the humidity control module. The humidity control module receives the signal transmitted by the humidity detection component 71 to obtain the humidity information detected by it. When the humidity is higher or lower than the preset humidity, the humidity control module will send an instruction to make the humidity adjustment component 72 perform drying or humidification work until the humidity detection component 71 detects that the internal humidity of the main housing 1 is equal to the preset humidity.

[0070] Exemplarily, the temperature detection element 61 includes a temperature monitoring sensor, and the humidity detection element 71 includes a humidity monitoring sensor.

[0071] Alternatively, if Figures 1 to 3As shown, 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. The first shell 431 is circumferentially arranged on the outside of the shale sample 100, and 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, the second rack 433 is arranged on the frame 432, and the second gear and the second rack 433 are meshed. The ray emitting element 435 and the ray detecting element 436 are arranged at intervals on the side of the frame 432 facing the shale sample 100 along the circumferential direction, and the ray detecting element 436 is used to detect the rays emitted by the ray emitting element 435. The ray emitting element 435 is connected to the signal processing device in communication to convert the rays into images. When the shale sample 100 is subjected to X-ray scanning imaging, the second gear is driven to rotate. Since the second gear and the second rack 433 are meshed, the second rack 433 will drive the frame 432 to rotate vertically, and at the same time control the radiation emitting element 435 to emit radiation. The radiation will penetrate the shale sample 100 and be received by the radiation detection element 436 and converted into an electrical signal. The electrical signal will then be transmitted to the signal processing device, and after being processed by the signal processing device, 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, if Figures 1 to 3 As shown, 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 outside the shale sample 100, and 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 with the nuclear magnetic resonance analyzer 412, so that the nuclear magnetic resonance analyzer 412 receives and processes the resonance signal. 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, so that the shale sample 100 absorbs energy and releases a resonance signal. Then, the nuclear magnetic resonance induction coil 413 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] Embodiment 2

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

[0077] S1. preparing and processing a shale sample 100;

[0078] 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, so as to detect the initial nuclear magnetic resonance signal intensity, the initial radionuclide imaging image and the initial ray scanning imaging image of the shale sample 100, and to 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, 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, 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;

[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 ray scanning imaging device 43 are controlled 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 to detect the weight of the shale sample 100 at the current moment;

[0082] S6, determining whether the weight difference between two adjacent tests of the shale sample 100 is less than or equal to 0.01 g, if yes, proceed to S7, if no, 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 times;

[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, firstly, prepare the 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 inducing the spontaneous imbibition phenomenon of the shale sample 100; whenever the shale sample 100 spontaneously imbibes After the first preset time of imbibition, 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 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 at the same time detect the weight of the shale sample 100 at the current moment; determine whether the difference between the weights of the shale samples 100 detected in two adjacent times is less than or equal to 0.01g, if not, repeat the above operation, so as to obtain the nuclear magnetic resonance signal intensity, the radionuclide imaging image, the ray scanning imaging image and the quality of the shale sample 100 at multiple moments, if so, stop the detection, collect and process all the detection data and images, and analyze the spontaneous imbibition process of the shale sample 100.

[0085] In step S7, by collecting the radionuclide imaging device 42 images 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 radius r at time t; n is the total number of pore channels with radius r; C total (t) represents the total concentration of radioactive isotopes in the shale sample 100 at time t; t is the NMR intensity at time t; I0 ​​is the NMR intensity at the initial state; I sat is the NMR intensity after the imbibition is completed.

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

[0092] S11, selecting a suitable shale sample 100 from a 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 size of the shale sample 100 is 2.5 cm in diameter, 4 cm in length, the preset temperature is 60° C., and the second preset time is 24 hours. By drying the shale sample 100, it can be ensured that there is no residual liquid and volatile matter in its pores, which is conducive to ensuring the integrity and accuracy of its spontaneous imbibition process.

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

[0099] S51, setting a first preset interval time, 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;

[0100] S52, calculating the imbibition rate of the shale sample 100 according to 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 curve 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 stage of imbibition according to the imbibition rate curve, if yes, proceed to step S54, if no, 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, the radionuclide imaging image and the 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 clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope 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), wherein the containing box (3) is provided with a containing chamber (31), wherein the containing chamber (31) is configured to store an isotope imbibition liquid, wherein the lower end of the shale sample (100) extends into the containing chamber (31) and contacts the liquid surface of the isotope imbibition liquid, wherein the isotope imbibition liquid includes a plurality of radioactive isotopes with different half-lives; An imaging module (4) is arranged 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 in a vertically spaced manner, the nuclear magnetic resonance device (41), the radionuclide imaging device (42) and the ray scanning imaging device (43) are all arranged in a circumferential direction outside the shale sample (100), and are all able to move in a vertical direction, 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 arranged on the clamping assembly (2), and the weight detection module (5) is used to detect the weight of the shale sample (100).

2. The shale spontaneous imbibition detection device according to claim 1, characterized in that: The imaging module (4) further comprises a mounting base (44), a first gear (45) and a first rack (46); 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; the first gear (45) is meshed with the first rack (46).

3. The shale spontaneous imbibition detection device according to claim 1, characterized in that: The clamping assembly (2) comprises 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 part 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 the horizontal direction. The telescopic pressing member can press against the side wall of the shale sample (100) so that the clamping shell (22) clamps and fixes the shale sample (100).

4. The shale spontaneous imbibition detection device according to any one of claims 1 to 3, characterized in that: The shale spontaneous imbibition detection device further comprises a temperature control unit (6) arranged in the main shell (1), the temperature control unit (6) comprising a temperature detection component (61), a temperature adjustment component (62) and a temperature control module, the temperature detection component (61) being used to detect the temperature inside the main shell (1), the temperature detection component (61) and the temperature adjustment component (62) being both communicatively connected to the temperature control module, and the temperature adjustment component (62) being used to adjust the internal temperature of the main shell (1) to a preset temperature.

5. The shale spontaneous imbibition detection device according to any one of claims 1 to 3, characterized in that: The shale spontaneous imbibition detection device further comprises a humidity control unit (7) arranged in the main shell (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 shell (1), the humidity detection component (71) and the humidity adjustment component (72) being both communicatively connected with the humidity control module, and the humidity adjustment component (72) being used to adjust the internal humidity of the main shell (1) to a preset humidity.

6. The shale spontaneous imbibition detection device according to any one of claims 1 to 3, characterized in that: The radiation scanning imaging device (43) comprises a first shell (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, 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 a side of the first shell (431) facing the shale sample (100), and the second gear is disposed on the side of the first shell (431) facing the shale sample (100). 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 on a side of the frame (432) facing the shale sample (100). The ray detecting element (436) is used to detect the rays emitted by the ray emitting element (435). The ray emitting element (435) is communicatively connected with the signal processing device to convert the rays into a ray scanning imaging image.

7. The shale spontaneous imbibition detection device according to any one of claims 1 to 3, characterized in that: The nuclear magnetic resonance device (41) comprises 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 with the nuclear magnetic resonance analyzer (412) so that the nuclear magnetic resonance analyzer (412) receives and processes a resonance signal.

8. A method for using a shale spontaneous imbibition detection device, using the shale spontaneous imbibition detection device as described in any one of 1 to 5 above, characterized in that: The method for using the shale spontaneous imbibition detection device comprises the following steps: S1. preparing and processing a shale sample (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, so as to detect the initial nuclear magnetic resonance signal intensity, the initial radionuclide imaging image and the initial ray scanning imaging image of the shale sample (100), and to detect the initial weight of the shale sample (100); S3, preparing an isotope imbibition liquid, and storing the isotope imbibition liquid in a receiving chamber (31) of a 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, the nuclear magnetic resonance device (41), the radionuclide imaging device (42) and the ray scanning imaging device (43) are controlled 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 to detect 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, if so, proceeding to S7, 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 times; S7. Collect and process all detection data and images, and analyze the spontaneous imbibition process of the shale sample (100).

9. The method for using the shale spontaneous imbibition detection device according to claim 8, 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.

10. The method for using the shale spontaneous imbibition detection device according to claim 8, characterized in that: The step S5 specifically comprises 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) according to 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 curve diagram 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, setting a second preset interval time, when the spontaneous imbibition time of the shale sample (100) is equal to the second 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.

Images