Movable gas hydrate nuclear magnetic resonance device and detection method thereof

Abstract

The invention relates to a movable gas hydrate nuclear magnetic resonance device and a detection method thereof.The device comprises a shell and a nuclear magnetic resonance equipment body, a lifting supporting structure is arranged in the shell, a movable frame is connected to the lifting supporting structure, and the nuclear magnetic resonance equipment body is fixedly connected into the movable frame; a wire slot is formed in the inner side of the shell, and a cable connected to the nuclear magnetic resonance equipment body is arranged in the wire slot in a penetrating manner; the lifting supporting structure comprises a plurality of push rod shafts, each push rod shaft is connected with a driving structure capable of driving the corresponding push rod shaft to rotate, the push rod shafts are sleeved with the movable frame, and the movable frame can be driven by rotation of the push rod shafts to ascend and descend along the center axes of the push rod shafts so as to drive the nuclear magnetic resonance equipment body to ascend and descend. The real-time state in the pipeline is monitored through movement of the nuclear magnetic resonance equipment body, the device is more practical, movement of the nuclear magnetic resonance equipment body is achieved by controlling the driving structure, and multi-condition and multi-angle characteristic research of the gas hydrate can be met.

Description

Technical Field

[0001] The invention relates to the technical field of gas hydrate microscopic research, and in particular to a movable gas hydrate nuclear magnetic resonance device and a detection method thereof. Background Art

[0002] With the decrease in recoverable oil and gas resources and the increase in consumption, the world's energy shortage and environmental problems are prominent, and the development of new energy and energy conservation and environmental protection have become the focus of attention. At present, solving the problem of energy demand is imminent. The development and utilization of new clean energy and the reduction of the negative impact of energy use and technological development on the environment are the main ways to solve the energy problem.

[0003] Natural gas hydrates are favored because of their huge reserves, relatively practical resource development technology, and their exploration and production can be carried out simultaneously with the exploration and production of conventional oil and gas. The scientific community generally believes that natural gas hydrates will become a clean energy with great potential in the future. CO2 hydrates are gradually coming into people's view. Since CO2 hydrates have a higher density than water, and the high pressure and low temperature conditions of the marine environment are suitable for the formation and stability of hydrates, hydrates can be used to permanently seal CO2 on the seabed. Therefore, whether from the perspective of energy or environmental protection, it is necessary to further improve the understanding of gas hydrates.

[0004] Nuclear magnetic resonance provides macroscopic and microscopic information for gas hydrate research. As one of the key tools for observing hydrate molecular level and microscopic structure, nuclear magnetic resonance and its derivative nuclear magnetic resonance imaging technology have gradually demonstrated their value in the research of guest and hydrate structure analysis, guest-guest interaction, phase transition, hydrate kinetics and thermodynamic processes, temperature measurement, hydrate formation and decomposition process, etc.

[0005] Conventional NMR experimental equipment is fixed, and the state of the deposition layer at different positions is detected by changing the position of the reactor. However, in actual industrial applications, the position of the pipeline cannot be changed, and the real-time state in the pipeline cannot be monitored.

[0006] Therefore, the inventors, relying on their many years of experience and practice in related industries, propose a mobile gas hydrate nuclear magnetic resonance device and a detection method thereof to overcome the defects of the prior art. Summary of the invention

[0007] The purpose of the present invention is to provide a movable gas hydrate nuclear magnetic resonance device and a detection method thereof, which monitors the real-time status in the pipeline by moving the nuclear magnetic resonance device body, is more practical, and realizes the precise movement of the nuclear magnetic resonance device body by controlling the driving structure. The movement speed and each movement distance can be modified, which can meet the multi-condition and multi-angle characteristic research of gas hydrates.

[0008] The objective of the present invention is achieved in this way. A movable gas hydrate nuclear magnetic resonance device comprises a shell and a nuclear magnetic resonance device body, wherein a lifting support structure is arranged in the shell, a movable frame is connected to the lifting support structure, and the nuclear magnetic resonance device body is fixedly connected to the movable frame; a wire groove is arranged on the inner side of the shell, and the wire groove is used to pass the cables connected to the nuclear magnetic resonance device body; the lifting support structure comprises a plurality of push rod shafts, each of which is connected to a driving structure capable of driving each of the push rod shafts to rotate around its own central axis, the movable frame is sleeved on each of the push rod shafts, and the movable frame can be lifted and moved along the central axis of the push rod shaft under the rotation drive of each of the push rod shafts to drive the nuclear magnetic resonance device body to be lifted and moved along the central axis of the push rod shaft.

[0009] In a preferred embodiment of the present invention, the shell includes a top plate, a bottom plate, a front panel, a rear panel and side panels, the front panel is provided with an opening for detection, the top plate is provided with a top notch, the opening end of the top notch corresponds to the detection opening, the top notch is used for the lifting and lowering of the movable frame and the passage of the parts to be detected, and the bottom notch is provided on the bottom plate for the passage of the parts to be detected; a rubber protective cover is provided around the outer side of the lifting support structure in the shell, and the rubber protective cover is opened relative to the detection opening.

[0010] In a preferred embodiment of the present invention, the movable frame includes a connecting middle plate, a accommodating notch is arranged on the connecting middle plate at a position relative to the detection opening, a side baffle plate is arranged at the accommodating notch, the nuclear magnetic resonance equipment body is arranged on the inner side of the side baffle plate and the nuclear magnetic resonance equipment body is fixedly connected to the connecting middle plate; an internal threaded hole is arranged at a position of the connecting middle plate corresponding to each of the push rod shafts, an external threaded portion is arranged on the outer wall of each of the push rod shafts, the push rod shaft and the connecting middle plate form a screw nut transmission mechanism, and the rotation of the push rod shaft is converted into the movement of the connecting middle plate, so as to drive the nuclear magnetic resonance equipment body to move up and down along the central axis of the push rod shaft.

[0011] In a preferred embodiment of the present invention, a plurality of connecting grooves are arranged on the connecting middle plate, a plurality of fixtures are connected to the bottom end of the nuclear magnetic resonance equipment body, and each of the fixtures can be fixedly connected in each of the connecting grooves; the movable frame, the fixtures and the wire trough are made of plastic.

[0012] In a preferred embodiment of the present invention, the driving structure includes a driving motor and multiple reducers, transmission shafts, and lift seats, each of which is arranged on the bottom plate, each of the push rod shafts passes through the connecting middle plate, and both ends of each of the push rod shafts are respectively hinged to the lift seat and the top plate, and the driving motor drives each of the push rod shafts to rotate around its own central axis through each of the reducers, each of the transmission shafts, and each of the lift seats.

[0013] In a preferred embodiment of the present invention, a first gear and a second gear that mesh with each other are provided in the elevator seat, the first gear is sleeved on the push rod shaft, and the second gear is sleeved on the transmission shaft extending into the elevator seat, and the torque of the driving motor is transmitted to each push rod shaft through each reducer, each transmission shaft, each second gear and each first gear.

[0014] In a preferred embodiment of the present invention, the number of the reducers is 3, which are set as a first reducer, a second reducer and a third reducer, the second reducer is located on one side of the lifting support structure, the third reducer is located on the other side of the lifting support structure, and the first reducer is arranged between the second reducer and the third reducer;

[0015] The driving motor is connected to the first reducer via a transmission shaft, the first reducer is connected to the second reducer and the third reducer on both sides via a transmission shaft, and the second reducer is connected to the lifting base on both sides via a transmission shaft.

[0016] In a preferred embodiment of the present invention, a limiter is arranged above the base plate, and the limiter is used to limit the movable frame; and anchor bolts for support are connected below the base plate.

[0017] In a preferred embodiment of the present invention, earrings for hanging are connected above the top plate;

[0018] The shell is made of aluminum alloy to isolate external electromagnetic interference.

[0019] The object of the present invention can also be achieved in this way. A detection method is implemented using the aforementioned movable gas hydrate nuclear magnetic resonance device, comprising the following steps:

[0020] Step a, before testing, assemble a hydrate experimental structure, the hydrate experimental structure includes a glass fiber reinforced plastic connecting pipe, a measuring antenna, a circulating temperature control system, an upper reactor, a lower reactor, a water injection pump and a gas cylinder, the circulating temperature control system includes a circulating refrigerator and a coil, and a coolant circulates in the circulating refrigerator and the coil; the upper reactor and the lower reactor are respectively connected to the two ends of the glass fiber reinforced plastic connecting pipe, the coil is wound around the glass fiber reinforced plastic connecting pipe, and the two ends of the coil are respectively connected to the water inlet and the water outlet of the circulating refrigerator; the measuring antenna is buckled onto the glass fiber reinforced plastic connecting pipe;

[0021] Step b, hoisting the movable gas hydrate nuclear magnetic resonance device to the detection position, the glass fiber reinforced plastic connecting pipe passes through the detection area of ​​the nuclear magnetic resonance device body, and connects the magnet of the nuclear magnetic resonance device body with the measuring antenna;

[0022] Step c, injecting water into the upper reactor through the water injection pump, and injecting gas into the lower reactor to a target pressure through the gas cylinder to perform a hydrate experiment;

[0023] Step d: During the nuclear magnetic resonance test, the mobile frame is controlled to move up and down by controlling the driving structure, thereby driving the nuclear magnetic resonance device body to move up and down. The moving speed and each moving distance can be modified to complete multi-condition and multi-mode measurement.

[0024] As described above, the movable gas hydrate nuclear magnetic resonance device and the detection method thereof of the present invention have the following beneficial effects:

[0025] In the present invention, the driving structure, the lifting support structure and the moving frame are used to realize the smooth movement of the nuclear magnetic resonance device body, and the real-time status in the pipeline is monitored by the movement of the nuclear magnetic resonance device body, which is more practical.

[0026] The precise movement of the nuclear magnetic resonance device body can be achieved by controlling the driving structure, and its movement speed and each movement distance can be modified to meet multi-condition and multi-mode measurements.

[0027] A wire groove is arranged in the shell of the present invention. Since the nuclear magnetic resonance device body moves up and down with the movable frame, the test cables connected to the external test system will also move accordingly. The wire groove can realize the arrangement of the cables connected to the nuclear magnetic resonance device body to prevent them from breaking.

[0028] It is of great practical significance to build a mobile nuclear magnetic resonance device for gas hydrate testing in the hydrate formation and decomposition experiment conducted under laboratory conditions. The present invention can simulate the application of nuclear magnetic resonance imaging devices in actual production to a great extent, and provide relevant theoretical and technical support for the commercial exploitation of hydrates and the marine storage of carbon dioxide in the form of hydrates. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0030] in:

[0031] Figure 1 It is a schematic diagram of the overall structure of the movable gas hydrate nuclear magnetic resonance device of the present invention.

[0032] Figure 2 This is a structural diagram of the interior of the housing of the movable gas hydrate nuclear magnetic resonance device of the present invention.

[0033] Figure 3 Schematic diagram of the mobile frame of the present invention.

[0034] Figure 4 It is a schematic diagram of the wire duct and the limiter of the present invention.

[0035] Figure 5 Schematic diagram of a fastener of the present invention.

[0036] Figure 6 It is a schematic diagram of the working state of the movable gas hydrate nuclear magnetic resonance device of the present invention.

[0037] Figure 7 Schematic diagram of the experimental structure of hydrate.

[0038] In the figure:

[0039] 100. Mobile gas hydrate nuclear magnetic resonance device;

[0040] 1. Shell; 10. Wire trough; 11. Top plate; 12. Bottom plate; 13. Front panel; 14. Rear panel; 15. Side panel; 16. Stopper; 17. Anchor bolt; 18. Support guide rod;

[0041] 2. Nuclear magnetic resonance equipment body;

[0042] 3. Lifting support structure; 31. Push rod shaft;

[0043] 4. Mobile frame; 41. Connecting middle plate; 411. Internal threaded hole; 412. Through hole; 42. Side baffle plate;

[0044] 5. Driving structure; 51. First reducer; 52. Second reducer; 53. Third reducer; 54. Transmission shaft; 55. Lifting machine base;

[0045] 6. Rubber protective cover;

[0046] 7. Fixer;

[0047] 8. Earrings;

[0048] 200. Hydrate experimental structure; 201. Glass fiber reinforced plastic connecting pipe; 202. Measuring antenna; 203. Upper reactor; 204. Lower reactor; 205. Water injection pump; 206. Gas cylinder; 207. Circulating refrigerator; 208. Coil. DETAILED DESCRIPTION

[0049] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0050] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0052] like Figures 1 to 6As shown, the present invention provides a movable gas hydrate nuclear magnetic resonance device 100, including a shell 1 and a nuclear magnetic resonance device body 2, a lifting support structure 3 is arranged in the shell 1, a movable frame 4 is connected to the lifting support structure 3, and the nuclear magnetic resonance device body 2 is fixedly connected to the movable frame 4; a wire groove 10 is arranged on the inner side of the shell 1, and the wire groove 10 is used to pass the cables connected to the nuclear magnetic resonance device body 2. In a specific embodiment, the wire groove 10 is a rolling wire groove structure; the lifting support structure 3 includes a plurality of push rod shafts 31, each of which is connected to a driving structure 5 that can drive each push rod shaft 31 to rotate around its own central axis, and the movable frame 4 is sleeved on each push rod shaft 31, and the movable frame 4 can be lifted and moved along the central axis of the push rod shaft 31 under the rotation drive of each push rod shaft 31 to drive the nuclear magnetic resonance device body 2 to lift and move along the central axis of the push rod shaft 31.

[0053] Conventional nuclear magnetic resonance experimental devices are fixed, and the state of the deposition layer at different positions is detected by changing the position of the reactor. However, in actual industrial applications, the position of the pipeline cannot be changed. In the movable gas hydrate nuclear magnetic resonance device 100 provided by the present invention, the smooth movement of the nuclear magnetic resonance device body 2 is achieved through the driving structure 5, the lifting support structure 3 and the movable frame 4. The real-time state in the pipeline is monitored by the movement of the nuclear magnetic resonance device body 2, which is more practical.

[0054] The precise movement of the nuclear magnetic resonance device body 2 is achieved by controlling the driving structure 5, and the movement speed and each movement distance can be modified to meet multi-condition and multi-mode measurements.

[0055] A wire groove 10 is provided in the shell of the present invention. Since the MRI device body 2 moves up and down with the movable frame 4, the test cables connected to the external test system will also move accordingly. The wire groove 10 can realize the arrangement of the cables connected to the MRI device body 2 to prevent them from breaking.

[0056] The use of the present invention can simulate the application of nuclear magnetic resonance imaging devices in actual production to a great extent, and provide relevant theoretical and technical support for the commercial exploitation of hydrates and the marine storage of carbon dioxide in the form of hydrates.

[0057] Further, if Figure 1 , Figure 2 As shown, the shell includes a top plate 11, a bottom plate 12, a front panel 13, a rear panel 14 and a side panel 15. The front panel 13 is provided with an opening for detection, and the top plate 11 is provided with a top notch. The open end of the top notch corresponds to the detection opening. The top notch is used for the movable frame 4 to be lifted and lowered and the parts to be detected (pipes) to pass through. The bottom plate 12 is provided with a bottom notch for the parts to be detected to pass through. A rubber protective cover 6 is provided around the outer side of the lifting support structure 3 in the shell 1, and the rubber protective cover 6 is opened relative to the detection opening.

[0058] The rubber boot fills the space enclosed by the mobile frame, housing and chassis.

[0059] Furthermore, the housing 1 is made of aluminum alloy, which can effectively isolate external electromagnetic interference and does not contain magnetism.

[0060] The rubber protective sleeve 6 is made of a synthetic rubber material having good wear resistance, high elasticity, tear strength and elongation.

[0061] Further, if Figure 2 , Figure 3 As shown, the movable frame 4 includes a connecting middle plate 41, a receiving notch is arranged on the connecting middle plate 41 at a position relative to the detection opening, a side baffle plate 42 is arranged at the receiving notch, the nuclear magnetic resonance equipment body 2 is arranged on the inner side of the side baffle plate 42 and the nuclear magnetic resonance equipment body 2 is fixedly connected to the connecting middle plate 41; an internal threaded hole is arranged at a position corresponding to each push rod shaft 31 of the connecting middle plate 41, and an external threaded portion is arranged on the outer wall of each push rod shaft 31, and the push rod shaft 31 and the connecting middle plate 41 form a screw nut transmission mechanism, and the rotation of the push rod shaft 31 is converted into the movement of the connecting middle plate 41, so as to drive the nuclear magnetic resonance equipment body 2 to move up and down along the central axis of the push rod shaft 31.

[0062] In a specific embodiment, the four corners of the connecting middle plate 41 are respectively provided with internal threaded holes 411, and the four push rod shafts 31 are respectively passed through the internal threaded holes 411. The four corners of the connecting middle plate 41 can also be provided with connecting through holes, and connecting nuts with internal threaded holes are provided in the connecting through holes.

[0063] Furthermore, a plurality of support guide rods 18 are arranged between the top plate 11 and the bottom plate 12. The support guide rods 18 pass through the connecting middle plate 41 with a clearance fit. Through holes 412 are arranged at corresponding positions of the connecting middle plate 41, and the support guide rods 18 pass through the through holes 412. The support guide rods 18 support the top plate 11 and guide the connecting middle plate 41.

[0064] Furthermore, a plurality of connection grooves are provided on the connection middle plate 41, and a plurality of fixtures 7 are connected to the bottom end of the MRI device body 2, and each fixture 7 can be fixedly connected in each connection groove. The MRI device body 2 is fixed to the moving frame 4 by the fixture 7 to prevent it from slipping during movement.

[0065] like Figure 5 As shown, the fixture 7 is an embedded structure, the embedded part of which has a diameter of 1 cm, and the upper part is opened in the form of a flange, and the opening diameter is 2 cm. The fixture is completely in line with the mobile frame 4 as a whole, and can play a good fixing role.

[0066] The movable frame 4 and the fixture 7 are made of high-strength plastic. The movable frame 4, the fixture 7 and the wire slot 10 are close to the nuclear magnetic resonance device body 2 and are made of plastic to avoid affecting the detection of the nuclear magnetic resonance device body 2.

[0067] Further, if Figure 2 As shown, the driving structure 5 includes a driving motor and multiple reducers, a transmission shaft 54, and a lifting seat 55. Each lifting seat 55 is arranged on the bottom plate 12. Each push rod shaft 31 passes through the connecting middle plate 41 and the two ends of each push rod shaft 31 are respectively hinged on the lifting seat 55 and the top plate 11. The driving motor drives each push rod shaft 31 to rotate around its own central axis through each reducer, each transmission shaft 54, and each lifting seat 55.

[0068] A first gear and a second gear meshing with each other are provided in the lift seat 55. The first gear is sleeved on the push rod shaft 31, and the second gear is sleeved on the transmission shaft 54 ​​extending into the lift seat 55. The torque of the driving motor is transmitted to each push rod shaft 31 through each reducer, each transmission shaft 54, each second gear and each first gear.

[0069] Each transmission shaft 54 ​​is arranged parallel to the ground, and each push rod shaft 31 is arranged perpendicular to the ground.

[0070] In this embodiment, the number of reducers is 3, which are set as a first reducer 51, a second reducer 52 and a third reducer 53. The second reducer 52 is located on one side of the lifting support structure 3, and the third reducer 53 is located on the other side of the lifting support structure 3. The first reducer 51 is arranged between the second reducer 52 and the third reducer 53.

[0071] The driving motor is connected to the first reducer 51 via a transmission shaft 54 ​​, the first reducer 51 is connected to the second reducer 52 and the third reducer 53 via a transmission shaft 54 ​​on both sides, and the second reducer 52 is connected to a lifting base 55 via a transmission shaft 54 ​​on both sides.

[0072] The four corners of the lift base 55 are respectively equipped with a push rod shaft 31 and connected to the moving frame 4 to form a whole. The central reducer (the first reducer 51) can be controlled to drive the other parts to move as a whole.

[0073] Further, if Figure 4 As shown, a stopper 16 is provided above the bottom plate 12, and the stopper 16 is used to limit the moving frame 4; the stopper 16 is made of a titanium alloy with higher hardness. Specifically, the stopper 16 is distributed around the bottom plate 12 to prevent the moving frame 4 from exceeding the maximum stroke and falling off, thereby causing damage to the nuclear magnetic resonance device body 2.

[0074] like Figure 1 , Figure 4As shown, the bottom of the bottom plate 12 is connected with a foundation bolt 17 for supporting the whole device for convenient fixing. In a specific embodiment, a foundation bolt 17 is respectively arranged at the four corners of the bottom plate 12 to complete the fixing of the device.

[0075] Furthermore, an inspection door that can be opened and closed is provided on the rear panel 14, and the inspection door is provided to facilitate opening the housing 1 and inspecting the interior thereof.

[0076] Furthermore, the side panel 15 is a detachable aluminum alloy panel, which facilitates the maintenance of the internal space and the wiring of the cable duct.

[0077] Further, if Figure 1 As shown, the top of the top plate 11 is connected with an earring 8 for hoisting, which is convenient for transportation and movement. In a specific embodiment, an earring 8 is respectively arranged at the four corners of the top plate 11.

[0078] A threaded interface is provided on the top plate 11 , and the threaded interface is connected to the earring 8 via a fixer 7 .

[0079] Furthermore, the earrings 8 and the anchor bolts 17 can be made of 316 stainless steel. Since they are far away from the main body 2 of the nuclear magnetic resonance device, they will not affect it.

[0080] Example 1

[0081] Through the driving control of the lifting support structure 3 of the present invention, the maximum lifting distance of the nuclear magnetic resonance equipment body 2 connected to the mobile frame 4 is 1.8 meters, and the maximum load-bearing capacity is 1.6 tons. The magnetic resonance probe (existing technology) can be quickly and accurately displaced in the vertical direction, and the displacement control accuracy is 0.1mm and the displacement speed is controllable. It is equipped with an overload self-protection unit. It can be used normally under the condition of indoor humidity of 30% to 80%.

[0082] The present invention also provides a detection method, which is implemented using the aforementioned movable gas hydrate nuclear magnetic resonance device 100, and comprises the following steps:

[0083] Step a: Before testing, assemble the hydrate test structure 200, such as Figure 7As shown, the hydrate experimental structure 200 includes a glass fiber reinforced plastic connecting pipe 201 (to be detected), a measuring antenna 202, a circulating temperature control system, an upper reactor 203, a lower reactor 204, a water injection pump 205 and a gas cylinder 206. The circulating temperature control system includes a circulating refrigerator 207 and a coil 208. Cooling liquid circulates in the circulating refrigerator 207 and the coil 208; the upper reactor 203 and the lower reactor 204 are respectively connected to the two ends of the glass fiber reinforced plastic connecting pipe 201, the coil 208 is wound around the glass fiber reinforced plastic connecting pipe 201, and the two ends of the coil 208 are respectively connected to the water inlet and the water outlet of the circulating refrigerator 207; the measuring antenna 202 is buckled on the glass fiber reinforced plastic connecting pipe 201;

[0084] Specifically, it includes:

[0085] The upper reactor 203 and the lower reactor 204 are connected to the glass fiber reinforced plastic connecting pipe 201 through flanges, and the connection is sealed with a metal octagonal gasket. The coil 208 is evenly wound on the glass fiber reinforced plastic connecting pipe 201, and then the two ends of the coil 208 are respectively connected to the water inlet and outlet of the circulating refrigerator 207. The measuring antenna 202 is buckled on the glass fiber reinforced plastic connecting pipe 201.

[0086] The glass fiber reinforced plastic connecting pipe 201 has a length of 1500 mm, a diameter of 65 mm, and a pressure resistance of 40 MPa.

[0087] The measuring antenna 202 has a length of 300 mm and an inner diameter of 70 mm.

[0088] The temperature control range of the circulating refrigerator 207 is 0-20° C., and the temperature control accuracy is ±0.1° C. In a specific embodiment, the reaction temperature is controlled to be 5° C.

[0089] The cooling liquid circulating in the circulating refrigerator 207 is hydrogen-free and non-magnetic 3M electronic fluorinated liquid.

[0090] The coil 208 is made of a hydrogen-free and non-magnetic elastic rubber tube with an inner diameter of 2 mm.

[0091] The upper reactor 203 and the lower reactor 204 are both made of 316L stainless steel with a pressure resistance of 40 MPa.

[0092] The measuring antenna 202 is detachable, so it is convenient to install it with the glass fiber reinforced plastic connecting pipe 201.

[0093] Step b, hoisting the movable gas hydrate nuclear magnetic resonance device 100 to the detection position, the glass fiber reinforced plastic connecting pipe 201 passes through the detection area of ​​the nuclear magnetic resonance device body 2, and connects the magnet (existing technology) of the nuclear magnetic resonance device body 2 with the measuring antenna 202;

[0094] Specifically, it includes:

[0095] First, pass the lifting rope through the four earrings 8, lift it to the detection position by a crane, and fix the anchor bolts 17 to the ground. Figure 6 As shown, the glass fiber reinforced plastic connecting tube 201 is located in the middle space of the movable gas hydrate nuclear magnetic resonance device 100, that is, the top notch, the bottom notch, and the detection area of ​​the nuclear magnetic resonance device body 2.

[0096] The magnet (existing technology) of the nuclear magnetic resonance device body 2 is connected to the measuring antenna 202 and the glass fiber reinforced plastic connecting tube 201 for detection.

[0097] Step c, inject water into the upper reactor 203 through the water injection pump 205, and inject gas into the lower reactor 204 through the gas cylinder 206 to the target pressure to carry out a hydrate experiment; in a specific embodiment, the target pressure is 8 MPa.

[0098] Step d, during the nuclear magnetic resonance test, the moving frame 4 is controlled to move up and down by controlling the driving structure 5, driving the nuclear magnetic resonance device body 2 to move up and down, and its moving speed and each moving distance can be modified to complete multi-condition and multi-mode measurement. By performing mobile detection on the glass fiber reinforced plastic connecting pipe 201 between the upper reactor 203 and the lower reactor 204, the radial formation law of hydrates can be studied.

[0099] During the experiment, the driving structure 5 is controlled by operating a computer program (corresponding software recorded in advance), thereby controlling the movement of the mobile frame 4 and the test of the nuclear magnetic resonance device body 2, so as to realize the characteristic research of gas hydrate under multiple conditions and multiple angles.

[0100] As described above, the movable gas hydrate nuclear magnetic resonance device and the detection method thereof of the present invention have the following beneficial effects:

[0101] In the present invention, the driving structure, the lifting support structure and the moving frame are used to realize the smooth movement of the nuclear magnetic resonance device body, and the real-time status in the pipeline is monitored by the movement of the nuclear magnetic resonance device body, which is more practical.

[0102] The precise movement of the nuclear magnetic resonance device body can be achieved by controlling the driving structure, and its movement speed and each movement distance can be modified to meet multi-condition and multi-mode measurements.

[0103] A wire groove is arranged in the shell of the present invention. Since the nuclear magnetic resonance device body moves up and down with the movable frame, the test cables connected to the external test system will also move accordingly. The wire groove can realize the arrangement of the cables connected to the nuclear magnetic resonance device body to prevent them from breaking.

[0104] It is of great practical significance to build a mobile nuclear magnetic resonance device for gas hydrate testing in the hydrate formation and decomposition experiment conducted under laboratory conditions. The present invention can simulate the application of nuclear magnetic resonance imaging devices in actual production to a great extent, and provide relevant theoretical and technical support for the commercial exploitation of hydrates and the marine storage of carbon dioxide in the form of hydrates.

[0105] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A mobile gas hydrate nuclear magnetic resonance device, characterized in that: It includes an outer shell and a nuclear magnetic resonance device body, a lifting support structure is arranged in the outer shell, a movable frame is connected to the lifting support structure, and the nuclear magnetic resonance device body is fixedly connected to the movable frame; a wire groove is arranged on the inner side of the outer shell, and the wire groove is used to pass the cables connected to the nuclear magnetic resonance device body; the lifting support structure includes a plurality of push rod shafts, each of which is connected to a driving structure that can drive each push rod shaft to rotate around its own central axis, the movable frame is sleeved on each push rod shaft, and the movable frame can be lifted and moved along the central axis of the push rod shaft under the rotation drive of each push rod shaft to drive the nuclear magnetic resonance device body to lift and move along the central axis of the push rod shaft.

2. The mobile gas hydrate nuclear magnetic resonance device according to claim 1, characterized in that: The shell includes a top plate, a bottom plate, a front panel, a rear panel and side panels, the front panel is provided with an opening for detection, the top plate is provided with a top notch, the opening end of the top notch corresponds to the detection opening, the top notch is used for the movable frame to be raised and lowered and the parts to be detected to pass through, the bottom plate is provided with a bottom notch for the parts to be detected to pass through; a rubber protective cover is provided around the outer side of the lifting support structure in the shell, and the rubber protective cover is opened relative to the detection opening.

3. The mobile gas hydrate nuclear magnetic resonance device according to claim 2, characterized in that: The movable frame includes a connecting middle plate, a receiving notch is arranged on the connecting middle plate at a position relative to the detection opening, a side baffle is arranged at the receiving notch, the nuclear magnetic resonance equipment body is arranged on the inner side of the side baffle and the nuclear magnetic resonance equipment body is fixedly connected to the connecting middle plate; internal threaded holes are arranged at positions of the connecting middle plate corresponding to each of the push rod shafts, and external threaded portions are arranged on the outer walls of each of the push rod shafts, the push rod shafts and the connecting middle plate form a screw nut transmission mechanism, and the rotation of the push rod shaft is converted into the movement of the connecting middle plate, so as to drive the nuclear magnetic resonance equipment body to move up and down along the central axis of the push rod shaft.

4. The mobile gas hydrate nuclear magnetic resonance device according to claim 3, characterized in that: The connecting middle plate is provided with a plurality of connecting grooves, the bottom end of the nuclear magnetic resonance device body is connected with a plurality of fixers, each of the fixers can be fixedly connected in each of the connecting grooves; the movable frame, the fixers and the wire trough are made of plastic.

5. The mobile gas hydrate nuclear magnetic resonance device according to claim 3, characterized in that: The driving structure includes a driving motor and multiple reducers, transmission shafts, and lift seats. Each of the lift seats is arranged on the bottom plate. Each of the push rod shafts passes through the connecting middle plate and the two ends of each of the push rod shafts are respectively hinged to the lift seat and the top plate. The driving motor drives each of the push rod shafts to rotate around its own central axis through each of the reducers, each of the transmission shafts, and each of the lift seats.

6. The mobile gas hydrate nuclear magnetic resonance device according to claim 5, characterized in that: A first gear and a second gear meshing with each other are arranged in the elevator seat, the first gear is sleeved on the push rod shaft, and the second gear is sleeved on the transmission shaft extending into the elevator seat, and the torque of the drive motor is transmitted to each push rod shaft through each reducer, each transmission shaft, each second gear and each first gear.

7. The mobile gas hydrate nuclear magnetic resonance device according to claim 5, characterized in that: The number of the reducers is 3, which are set as a first reducer, a second reducer and a third reducer, the second reducer is located on one side of the lifting support structure, the third reducer is located on the other side of the lifting support structure, and the first reducer is arranged between the second reducer and the third reducer; The driving motor is connected to the first reducer via a transmission shaft, the first reducer is connected to the second reducer and the third reducer on both sides via a transmission shaft, and the second reducer is connected to the lifting base on both sides via a transmission shaft.

8. The mobile gas hydrate nuclear magnetic resonance device according to claim 2, characterized in that: A limiter is arranged above the base plate, and the limiter is used to limit the movable frame; and anchor bolts for support are connected below the base plate.

9. The mobile gas hydrate nuclear magnetic resonance device according to claim 2, characterized in that: The top of the top plate is connected with earrings for hanging; the shell is made of aluminum alloy to isolate external electromagnetic interference.

10. A detection method, implemented using the mobile gas hydrate nuclear magnetic resonance device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step a, before testing, assemble a hydrate experimental structure, the hydrate experimental structure includes a glass fiber reinforced plastic connecting pipe, a measuring antenna, a circulating temperature control system, an upper reactor, a lower reactor, a water injection pump and a gas cylinder, the circulating temperature control system includes a circulating refrigerator and a coil, and a coolant circulates in the circulating refrigerator and the coil; the upper reactor and the lower reactor are respectively connected to the two ends of the glass fiber reinforced plastic connecting pipe, the coil is wound around the glass fiber reinforced plastic connecting pipe, and the two ends of the coil are respectively connected to the water inlet and the water outlet of the circulating refrigerator; the measuring antenna is buckled onto the glass fiber reinforced plastic connecting pipe; Step b, hoisting the movable gas hydrate nuclear magnetic resonance device to the detection position, the glass fiber reinforced plastic connecting pipe passes through the detection area of ​​the nuclear magnetic resonance device body, and connects the magnet of the nuclear magnetic resonance device body with the measuring antenna; Step c, injecting water into the upper reactor through the water injection pump, and injecting gas into the lower reactor to a target pressure through the gas cylinder to perform a hydrate experiment; Step d: During the nuclear magnetic resonance test, the mobile frame is controlled to move up and down by controlling the driving structure, thereby driving the nuclear magnetic resonance device body to move up and down. The moving speed and each moving distance can be modified to complete multi-condition and multi-mode measurement.

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