Natural gas hydrate fractured reservoir identification device

Abstract

The utility model relates to a natural gas hydrate fractured reservoir identification device. The natural gas hydrate fractured reservoir identification device comprises a mounting cylinder, a servo motor, a servo motor controller, a detection, acquisition and transmission system, a direct current-direct current converter, a storage battery pack, a wireless communication module, a front collimator, a lead shielding tank, a rear collimator and a detector, a mounting plate is arranged in the mounting cylinder and divides the inner space of the mounting cylinder into an upper part and a lower part; a servo motor, a servo motor controller, a detection acquisition and transmission system, a direct current-direct current converter, a storage battery pack and a wireless communication module are arranged at the upper part of the mounting cylinder; a front collimator, a lead shielding tank, a rear collimator and a detector are arranged at the lower part of the mounting cylinder; a gamma ray source and a linkage device are arranged in the lead shielding tank, a radioactive source exit port is formed in the bottom of the lead shielding tank, one end of the linkage device is connected with a motor shaft of the servo motor, the other end of the linkage device penetrates out of the lead shielding tank to be connected with the shielding device, and the natural gas hydrate exploration device can be widely applied to the field of natural gas hydrate exploration equipment.

Description

Technical Field

[0001] The utility model relates to the field of natural gas hydrate exploration equipment, in particular to a natural gas hydrate fracture-type reservoir identification device. Background Art

[0002] Natural gas hydrates are ice-like crystalline substances formed by natural gas and water under high pressure and low temperature conditions, distributed in deep sea or terrestrial permafrost. Fractures are an effective pathway for gas-bearing fluids. High flux methane migrates to shallow layers along the fracture system, forming a seepage path in the gas hydrate stability zone of the gas chimney area, representing a vertical fluid concentration area. In the Qiongdongnan Basin in the northern South China Sea, a large number of veined nodular hydrates are gathered in the cracks on the top and sides of the gas chimney, forming fracture-filled hydrates, which are quite different from the pore-filled hydrates in the Shenhu and Dongsha areas in the northern South China Sea. The fracture-type hydrate reservoirs in the Qiongdongnan Basin of China are effectively described, and a quantitative index method is formed to distinguish fracture-type hydrates from pore-type hydrates. The parameters and seismic attributes that characterize fracture-type hydrates are optimized, so that the type, abundance and other characteristics of fracture-type hydrates can be obtained by multi-attribute inversion of seismic data.

[0003] The prior art discloses a deep-sea combustible ice detector based on gamma-ray Compton backscatter scanning technology, which provides the number of photons measured based on the Compton backscattering effect of the interaction between rays and matter, especially light matter, and obtains parameters such as the electron density distribution, mass density, effective atomic number and relative percentage content of the object being measured through data processing or reconstruction. Based on this, a standard sample database is established, and the detector can automatically determine whether it is combustible ice through self-developed software and discrimination indicators.

[0004] However, the prior art only uses a lead shielding sleeve with an open bottom to perform radiation shielding on a gamma-ray source container containing a gamma-ray source. Gamma rays can be emitted from the bottom of the lead shielding sleeve at any time, so that during transportation and storage, the gamma rays emitted by the gamma-ray source will cause radiation effects on the operator and surrounding organisms. Summary of the invention

[0005] In view of the above problems, the purpose of the utility model is to provide a natural gas hydrate fracture reservoir identification device capable of preventing gamma rays emitted by a gamma ray source from being emitted from an emission port of the radiation source.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: to provide a natural gas hydrate fracture reservoir identification device, including a mounting tube, a servo motor, a servo motor controller, a detection and transmission system, a DC-DC converter, a battery pack, a wireless communication module, a front collimator, a lead shielding tank, a rear collimator and a detector;

[0007] The installation tube is provided with an installation plate, dividing the internal space of the installation tube into upper and lower parts; the upper part of the installation tube is provided with the servo motor, servo motor controller, detection and transmission system, DC-DC converter, battery pack and wireless communication module; the lower part of the installation tube is provided with the front collimator, lead shielding tank, rear collimator and detector;

[0008] A gamma ray source and a linkage device are arranged in the lead shielding tank, a radiation source outlet is arranged at the bottom of the lead shielding tank, one end of the linkage device is connected to the motor shaft of the servo motor, and the other end of the linkage device passes through the lead shielding tank and is connected to a shielding device for blocking or opening the radiation source outlet;

[0009] The detector is electrically connected to the detection and transmission system and the DC-DC converter, respectively; the servo motor controller is electrically connected to the servo motor; the battery pack is electrically connected to the servo motor, the servo motor controller, the detection and transmission system, the DC-DC converter and the wireless communication module, respectively; the wireless communication module is electrically connected to the servo motor controller and the detection and transmission system.

[0010] Preferably, an equipment installation slot is provided in the internal space of the installation cylinder located above the installation plate; a ray source installation slot is provided in the middle of the internal space of the installation cylinder located below the installation plate, and a plurality of detector installation slots are arranged in a circular array outside the ray source installation slot;

[0011] The servo motor, servo motor controller, detection and transmission system, DC-DC converter, battery pack and wireless communication module are arranged in the equipment installation slot; the front collimator and lead shielding tank are arranged in the ray source installation slot; and the rear collimator and detector are arranged in each detector installation slot.

[0012] Preferably, the front collimator is arranged at the bottom of the radiation source installation groove; a supporting step is arranged in the middle of the radiation source installation groove, and the lead shielding tank is sandwiched between the supporting step and the installation plate.

[0013] Preferably, a flange protruding inwards is circumferentially arranged at the bottom of each detector mounting groove, and each rear collimator and detector is clamped between the corresponding flange and the mounting plate.

[0014] Preferably, a bottom plate is provided at the bottom of the mounting tube, and the bottom plate is used to block the bottom of the ray source mounting slot and the detector mounting slot to protect the bottom of the front collimator and the rear collimator.

[0015] Preferably, a partition is provided in the middle of the radiation source mounting groove, and the partition is located below the shielding device, a limiting ring is screwed on the bottom of the radiation source mounting groove, and the front collimator is clamped between the partition and the limiting ring.

[0016] Preferably, the linkage device comprises a rotating shaft, a driving gear and a driven gear;

[0017] The driving gear is fixedly arranged on the motor shaft of the servo motor; the rotating shafts are respectively arranged on both sides of the lead shielding tank, and the gamma-ray source is located between the two rotating shafts; the top of each rotating shaft is provided with the driven gear for meshing with the driving gear, and the bottom of each rotating shaft is provided with the shielding device.

[0018] Preferably, the shielding device comprises a stainless steel tray and a lead shielding block;

[0019] The bottom of each rotating shaft is provided with the stainless steel tray, and each stainless steel tray is provided with the lead shielding block. The opposite sides of the two lead shielding blocks are matched to be set as inclined surfaces. When the two lead shielding blocks are assembled to block the radiation source outlet, it can ensure that gamma rays do not leak from the joint between the two lead shielding blocks.

[0020] Preferably, a plurality of supporting feet are arranged in a circular array at the lower portion of the outer side wall of the mounting tube.

[0021] Preferably, an upper end cover is provided on the top of the mounting tube, and a handle is fixedly connected to the middle of the top end of the upper end cover.

[0022] Due to the adoption of the above technical scheme, the utility model has the following advantages: when the utility model is identifying the natural gas hydrate fracture reservoir, the lead shielding block is moved away from the lower part of the radiation source outlet, so that the gamma rays emitted by the gamma ray source are emitted from the radiation source outlet for detection; during transportation and storage, the radiation source outlet is blocked by the lead shielding block to prevent the gamma rays emitted by the gamma ray source from being emitted from the radiation source outlet. The utility model can be widely used in the field of natural gas hydrate exploration equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. The same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of a natural gas hydrate fracture reservoir identification device provided by an embodiment of the utility model;

[0025] Figure 2 It is a structural schematic diagram of a longitudinal section of a mounting tube provided by an embodiment of the utility model;

[0026] Figure 3 It is a longitudinal section schematic diagram of a device after the servo motor, rotating shaft, driving gear, driven gear, stainless steel tray, and lead shielding block provided in one embodiment of the utility model are assembled;

[0027] Figure 4 It is a bottom view schematic diagram of a state where a lead shielding block provided by an embodiment of the utility model blocks an outlet of a radiation source;

[0028] Figure 5 It is a schematic diagram of the structure of a lead shielding block and a stainless steel tray provided in one embodiment of the utility model;

[0029] Figure 6 It is a top view schematic diagram of a natural gas hydrate fracture-type reservoir identification device provided by one embodiment of the utility model.

[0030] The numbers in the figure are:

[0031] 1: Mounting tube; 2: Servo motor; 3: Servo motor controller; 4: Detection and transmission system; 5: DC-DC converter; 6: Linkage device; 7: Battery pack; 8: Wireless communication module; 9: Front collimator; 10: Lead shielding tank; 11: Gamma ray source; 12: Stainless steel tray; 13: Lead shielding block; 14: Rear collimator; 15: Detector;

[0032] 1-1: Mounting plate; 1-2: Equipment mounting slot; 1-3: Radiation source mounting slot; 1-4: Detector mounting slot; 1-5: Upper end cover; 1-6: Support step; 1-7: Flange; 1-8: Bottom plate; 1-9: Support foot; 1-10: U-shaped handle; 1-11: Partition plate; 1-12: Limit ring;

[0033] 6-1: driving gear; 6-2: rotating shaft; 6-3: driven gear;

[0034] 10-1: Stainless steel shell; 10-2: Radioactive source outlet. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0036] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0038] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0039] Since the prior art only uses a lead shielding sleeve with an open bottom to perform radiation shielding on the gamma-ray source container containing the gamma-ray source, the gamma rays can be emitted from the bottom of the lead shielding sleeve at any time, so that during transportation and storage, the gamma rays emitted by the gamma-ray source will cause radiation effects on the operator and surrounding organisms. The natural gas hydrate fracture-type reservoir identification device provided by the utility model includes an installation tube, a servo motor, a servo motor controller, a detection and transmission system, a DC-DC converter, a battery pack, a wireless communication module, a front collimator, a lead shielding tank, a rear collimator and a detector; an installation plate is provided in the installation tube, dividing the internal space of the installation tube into upper and lower parts; the upper part of the installation tube is provided with a servo motor, a servo motor controller, a detection and transmission system, a DC-DC converter, a battery pack and a wireless communication module; the lower part of the installation tube is provided with a front collimator, a lead shielding tank, a rear collimator and a detector; A gamma ray source and a linkage device are arranged in the lead shielding tank, a radiation source outlet is arranged at the bottom of the lead shielding tank, one end of the linkage device is connected to the motor shaft of the servo motor, and the other end of the linkage device passes through the lead shielding tank to connect to a shielding device used to block or open the radiation source outlet; the detector is electrically connected to the detection and transmission system and the DC-DC converter, the servo motor controller is electrically connected to the servo motor, the battery pack is electrically connected to the servo motor, the servo motor controller, the detection and transmission system, the DC-DC converter and the wireless communication module, and the wireless communication module is electrically connected to the servo motor controller and the detection and transmission system. When the utility model is used to identify natural gas hydrate fracture reservoirs, the lead shielding block is moved away from directly below the radiation source outlet, so that the gamma rays emitted by the gamma ray source are emitted from the radiation source outlet for detection; during transportation and storage, the radiation source outlet is blocked by the lead shielding block to prevent the gamma rays emitted by the gamma ray source from being emitted from the radiation source outlet.

[0040] Embodiment 1

[0041] like Figures 1 to 5 As shown, the utility model provides a natural gas hydrate fracture reservoir identification device, including a mounting tube 1, a servo motor 2, a servo motor controller 3, a detection and transmission system 4, a DC-DC converter 5, a linkage device 6, a battery pack 7, a wireless communication module 8, a front collimator 9, a lead shielding tank 10, a gamma ray source 11, a stainless steel tray 12, a lead shielding block 13, a rear collimator 14 and a detector 15.

[0042] like Figure 2As shown, a mounting plate 1-1 is provided in the mounting tube 1, dividing the internal space of the mounting tube 1 into two parts, upper and lower. The internal space above the mounting plate 1-1 is provided with a device mounting slot 1-2. A ray source mounting slot 1-3 is provided in the middle of the internal space below the mounting plate 1-1, and eight detector mounting slots 1-4 are arranged in a circular array outside the ray source mounting slot 1-3. The tops and bottoms of the device mounting slot 1-2, the ray source mounting slot 1-3, and the detector mounting slot 1-4 are all open.

[0043] like Figure 1 and Figure 3 As shown, a servo motor 2, a servo motor controller 3, a detection and transmission system 4 and a DC-DC converter 5 are arranged in the equipment installation slot 1-2, and a driving gear 6-1 is arranged on the motor shaft of the servo motor 2. An upper end cover 1-5 is arranged on the top of the installation cylinder 1, and a battery pack 7 and a wireless communication module 8 are arranged at the bottom of the upper end cover 1-5 located in the equipment installation slot 1-2.

[0044] like Figure 4 and Figure 5 As shown, a front collimator 9 is provided at the bottom of the ray source installation slot 1-3, and the front collimator 9 is used to couple the outgoing rays accurately to the position where irradiation is required. A support step 1-6 is provided in the middle of the ray source installation slot 1-3, and a lead shielding tank 10 is sandwiched between the support step 1-6 and the installation plate 1-1, and a stainless steel shell 10-1 is wrapped around the outer side of the lead shielding tank 10. A gamma-ray source 11 is installed in the middle of the lead shielding tank 10, a radiation source outlet 10-2 is arranged at the bottom of the lead shielding tank 10, rotating shafts 6-2 are arranged on both sides of the lead shielding tank 10, and a driven gear 6-3 for meshing with the driving gear 6-1 is arranged on the top of each rotating shaft 6-2. The bottom of each rotating shaft 6-2 passes through the lead shielding tank 10 and is provided with a stainless steel tray 12. A lead shielding block 13 for blocking the radiation source outlet 10-2 is arranged on each stainless steel tray 12. The opposite sides of the two lead shielding blocks 13 are matched to be arranged as inclined surfaces. When the two lead shielding blocks 13 are assembled to block the radiation source outlet 10-2, it can be ensured that gamma rays do not leak from the joint between the two lead shielding blocks 13.

[0045] The bottom of each detector mounting groove 1-4 is circumferentially provided with an inwardly protruding flange 1-7. A rear collimator 14 and a detector 15 are sequentially arranged from bottom to top in each detector mounting groove 1-4. The rear collimator 14 is used to couple the received rays to accurately project to the ray entrance of the detector 15. The detector 15 is used to receive the reflected gamma rays. Each rear collimator 14 and detector 15 are sandwiched between the corresponding flange 1-7 and the mounting plate 1-1.

[0046] The detector 15 is connected to the detection and transmission system 4 and the DC-DC converter 5 through cables, the servo motor controller 3 is connected to the servo motor 2 through cables, the battery pack 7 is connected to the servo motor 2, the servo motor controller 3, the detection and transmission system 4, the DC-DC converter 5 and the wireless communication module 8 through cables, and the wireless communication module 8 is connected to the servo motor controller 3 and the detection and transmission system 4 through cables.

[0047] The servo motor controller 3 is used to control the servo motor 2 to operate according to the control instructions sent by the external receiving device, so that the driving gear 6-1 rotates, thereby driving the driven gear 6-3, the stainless steel tray 12 and the lead shielding block 13 to rotate, so that the lead shielding block 13 is moved away from or to the bottom of the radiation source outlet 10-2, so that the gamma rays emitted by the gamma ray source 11 are emitted from the radiation source outlet 10-2 or the radiation source outlet 10-2 is blocked.

[0048] The detection and transmission system 4 is used to receive the negative pulse signals output by the eight detectors 15, process the parameters of the reflected gamma rays received by the detectors 15, and identify combustible ice.

[0049] The wireless communication module 8 is used to receive control instructions from an external receiving device and send the signal processed by the detection and transmission system 4 to the external receiving device. The receiving device can be a mobile phone, PC or other electronic device with wireless communication function.

[0050] The battery pack 7 is used to supply power to various electrical components of the utility model.

[0051] The DC-DC converter 5 is used to convert the low-voltage DC power in the battery pack 7 into high-voltage DC power and transmit it to the eight detectors 15 respectively, so as to meet the working requirements of the eight detectors 15 .

[0052] In a preferred embodiment, the cross-sections of the equipment mounting slot 1-2, the radiation source mounting slot 1-3 and the detector mounting slot 1-4 are all circular, and the mounting plate 1-1 is circular.

[0053] In a preferred embodiment, Figure 1 As shown, a bottom plate 1-8 is provided at the bottom of the mounting tube 1, and the bottom plate 20 is used to block the bottom of the ray source mounting slot 1-3 and the detector mounting slot 1-4 to protect the bottom of the front collimator 9 and the rear collimator 14.

[0054] In a preferred embodiment, Figure 1 , Figure 6 As shown, four supporting feet 1-9 are arranged in a circular array at the lower part of the outer wall of the mounting tube 1.

[0055] In a preferred embodiment, Figure 6As shown, the middle part of the top end of the upper end cover 1-5 is fixedly connected to the U-shaped handle 1-10.

[0056] In a preferred embodiment, Figure 2 As shown, a circular partition 1-11 is provided in the middle of the radiation source mounting groove 1-3, and the partition 1-11 is located below the stainless steel tray 12, a limiting ring 1-12 is screwed to the bottom of the radiation source mounting groove 1-3, and the front collimator 9 is clamped between the partition 1-11 and the limiting ring 1-12. The partition 1-11 is used to separate the front collimator 9 from the stainless steel tray 12 to avoid scratching the top of the front collimator 9 during the rotation of the stainless steel tray 12.

[0057] In a preferred embodiment, the detection and transmission system 4 includes a multiplexer, a buffer amplifier, a peak holder, an analog-to-digital converter, a peak-finding circuit, a timing generator, an embedded microprocessor, a memory and a communication interface.

[0058] The buffer amplifier is respectively connected to the multiplexer, the peak holder and the peak-seeking circuit, the peak holder is connected to the analog-to-digital converter, the peak-seeking circuit is connected to the timing generator, and the embedded microprocessor is respectively connected to the analog-to-digital converter, the timing generator, the memory and the communication interface.

[0059] The multiplexer is used to receive the negative pulse signals output by the eight detectors 15 through the cables and enter the buffer amplifier through the corresponding channels.

[0060] The buffer amplifier is used to process the negative pulse signal, obtain a certain gain and invert it into a positive pulse signal. One positive pulse signal is transmitted to the peak holder, and the other positive pulse signal is transmitted to the peak-seeking circuit.

[0061] The peak holder is used to process the positive pulse signal into a digital pulse signal indicating the peak position of the signal.

[0062] The peak-finding circuit is used to obtain a digital pulse signal indicating the peak position of the signal sent by the buffer amplifier and send it to the timing generator.

[0063] The timing generator is used to trigger according to the digital pulse signal to obtain a series of synchronous digital pulse signals: such as delayed pulses, and obtain clock signals, and send them to the embedded microprocessor.

[0064] The embedded microprocessor is used to send an interrupt signal and a clock signal to the analog-to-digital converter based on the received digital pulse signal; read the conversion result of the analog-to-digital converter, read the original count value from the corresponding memory, add one and then write it back to the memory to complete the counting of the multi-channel pulse amplitude analyzer; and communicate with the wireless communication module 8 through the communication interface via a cable.

[0065] The analog-to-digital converter is used to start working based on the interrupt signal and perform analog-to-digital conversion on the clock signal to ensure sufficient sampling and tracking time.

[0066] The embedded microprocessor and analog-to-digital converter are combined into a multi-channel pulse amplitude analyzer to measure the amplitude distribution of the electrical pulse signal, classify the pulse signal according to the amplitude and record the number of each type of signal. The multi-channel pulse amplitude analyzer sets and clamps the energy threshold according to the Compton backscattering measurement requirements to achieve the purpose of identifying methane hydrate.

[0067] Embodiment 2

[0068] The following describes in detail the use of the natural gas hydrate fracture reservoir identification device of the utility model through specific embodiments:

[0069] 1) When the natural gas hydrate fracture reservoir identification device of the present invention reaches the detection position, the wireless communication module 8 receives the instruction of opening the lead shielding block 13 and sends it to the servo motor controller 3.

[0070] 2) The servo motor controller 3 controls the servo motor 2 to operate according to the instruction to open the lead shielding block 13, so that the driving gear 6-1 rotates clockwise, thereby driving the driven gear 6-3, the stainless steel tray 12 and the lead shielding block 13 to rotate, so that the lead shielding block 13 is moved away from directly below the radiation source outlet 10-2, and the gamma rays emitted by the gamma ray source 11 are emitted from the radiation source outlet 10-2.

[0071] 3) The detector 15 outputs a negative pulse signal to the detection and transmission system 4. The detection and transmission system 4 receives and processes the negative pulse signals output by the eight detectors 15 to identify combustible ice.

[0072] 4) The wireless communication module 8 sends the signal processed by the detection and transmission system 4 to an external receiving device.

[0073] 5) After the natural gas hydrate fracture reservoir identification device completes detection, the wireless communication module 8 receives the instruction to close the lead shielding block 13 and sends it to the servo motor controller 3.

[0074] 6) The servo motor controller 3 controls the servo motor 2 to operate according to the instruction to close the lead shielding block 13, so that the driving gear 6-1 rotates counterclockwise, thereby driving the driven gear 6-3, the stainless steel tray 12 and the lead shielding block 13 to rotate, so that the lead shielding block 13 moves to the bottom of the radiation source outlet 10-2, blocks the radiation source outlet 10-2, and prevents the gamma rays emitted by the gamma ray source 11 from being emitted from the radiation source outlet 10-2.

[0075] The above embodiments are only used to illustrate the present invention, wherein the structure, connection method and manufacturing process of each component can be changed. Any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A natural gas hydrate fracture reservoir identification device, characterized in that: It includes a mounting tube, a servo motor, a servo motor controller, a detection and transmission system, a DC-DC converter, a battery pack, a wireless communication module, a front collimator, a lead shielding tank, a rear collimator and a detector; The installation tube is provided with an installation plate, dividing the internal space of the installation tube into upper and lower parts; the upper part of the installation tube is provided with the servo motor, servo motor controller, detection and transmission system, DC-DC converter, battery pack and wireless communication module; the lower part of the installation tube is provided with the front collimator, lead shielding tank, rear collimator and detector; A gamma ray source and a linkage device are arranged in the lead shielding tank, a radiation source outlet is arranged at the bottom of the lead shielding tank, one end of the linkage device is connected to the motor shaft of the servo motor, and the other end of the linkage device passes through the lead shielding tank and is connected to a shielding device for blocking or opening the radiation source outlet; The detector is electrically connected to the detection and transmission system and the DC-DC converter, respectively; the servo motor controller is electrically connected to the servo motor; the battery pack is electrically connected to the servo motor, the servo motor controller, the detection and transmission system, the DC-DC converter and the wireless communication module, respectively; the wireless communication module is electrically connected to the servo motor controller and the detection and transmission system.

2. A natural gas hydrate fracture reservoir identification device according to claim 1, characterized in that: An equipment installation slot is provided in the inner space of the installation tube located above the installation plate; a ray source installation slot is provided in the middle of the inner space of the installation tube located below the installation plate, and a plurality of detector installation slots are arranged in a circular array outside the ray source installation slot; The servo motor, servo motor controller, detection and transmission system, DC-DC converter, battery pack and wireless communication module are arranged in the equipment installation slot; the front collimator and lead shielding tank are arranged in the ray source installation slot; and the rear collimator and detector are arranged in each detector installation slot.

3. A natural gas hydrate fracture reservoir identification device as claimed in claim 2, characterized in that: The front collimator is arranged at the bottom of the ray source installation groove; a supporting step is arranged in the middle of the ray source installation groove, and the lead shielding tank is sandwiched between the supporting step and the installation plate.

4. A natural gas hydrate fracture reservoir identification device as claimed in claim 2, characterized in that: The bottom of each detector mounting groove is circumferentially provided with an inwardly protruding flange, and each of the rear collimators and detectors is clamped between the corresponding flange and the mounting plate.

5. A natural gas hydrate fracture reservoir identification device as claimed in claim 2, characterized in that: A bottom plate is arranged at the bottom of the installation tube, and the bottom plate is used to block the bottom of the ray source installation slot and the detector installation slot to protect the bottom of the front collimator and the rear collimator.

6. A natural gas hydrate fracture reservoir identification device as claimed in claim 2, characterized in that: A partition is provided in the middle of the ray source installation slot, and the partition is located below the shielding device. A limiting ring is screwed on the bottom of the ray source installation slot, and the front collimator is clamped between the partition and the limiting ring.

7. A natural gas hydrate fracture reservoir identification device according to claim 1, characterized in that: The linkage device comprises a rotating shaft, a driving gear and a driven gear; The driving gear is fixedly arranged on the motor shaft of the servo motor; the rotating shafts are respectively arranged on both sides of the lead shielding tank, and the gamma-ray source is located between the two rotating shafts; the top of each rotating shaft is provided with the driven gear for meshing with the driving gear, and the bottom of each rotating shaft is provided with the shielding device.

8. A natural gas hydrate fracture reservoir identification device as claimed in claim 7, characterized in that: The shielding device includes a stainless steel tray and a lead shielding block; The bottom of each rotating shaft is provided with the stainless steel tray, and each stainless steel tray is provided with the lead shielding block. The opposite sides of the two lead shielding blocks are matched to be set as inclined surfaces. When the two lead shielding blocks are assembled to block the radiation source outlet, it can ensure that gamma rays do not leak from the joint between the two lead shielding blocks.

9. A natural gas hydrate fracture reservoir identification device as claimed in claim 1, characterized in that: A plurality of supporting feet are arranged at the lower part of the outer side wall of the installation tube in a circular array.

10. A natural gas hydrate fracture reservoir identification device according to claim 1, characterized in that: An upper end cover is arranged on the top of the installation cylinder, and a handle is fixedly connected to the middle part of the top end of the upper end cover.

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