Hydrate storage medium disturbance device

Abstract

The present application discloses a hydrate-occurring medium disturbance device, comprising a hydrate reactor body and a disturbance mechanism, wherein the disturbance mechanism comprises a disturbance driving unit and a lifting plate, wherein the lifting plate is arranged inside the hydrate reactor body, and the disturbance driving unit drives the lifting plate to rise and fall, so as to squeeze and disturb the hydrate-occurring medium inside the hydrate reactor body. The hydrate-occurring medium disturbance device can simulate the disturbance of formation activity, so as to study the influence of the disturbance of formation activity on the equilibrium condition of hydrate occurrence.

Description

Technical Field

[0001] The present application relates to the technical field of natural gas storage and transportation, and in particular to a hydrate storage medium disturbance device. Background Art

[0002] At present, all hydrate reactors, whether used to form hydrates in pure water or solutions, or in porous media, maintain the stability of hydrates by controlling the ambient temperature and pressure after the hydrate formation process is completed, so as to carry out relevant research on its various properties.

[0003] However, even within the phase equilibrium range, external mechanical disturbances can still cause partial decomposition of gas hydrates. This means that in nature, even if gas hydrates are under temperature and pressure conditions that can maintain their stable existence, stratum disturbances caused by external earthquakes, tsunamis, tides, human drilling, oil and gas extraction, etc., will still cause repeated changes in the mechanical stress inside the hydrate-bearing sediments, which may lead to the decomposition of hydrates under mechanical stress and changes in the phase equilibrium conditions required to maintain their stable existence. At present, there is no experimental equipment that can simulate and study the impact of stratum activity disturbances on the equilibrium conditions of hydrate storage. Summary of the invention

[0004] The present application provides a hydrate storage medium disturbance device, which can simulate the disturbance of formation activity to study the influence of the disturbance of formation activity on the equilibrium condition of hydrate storage.

[0005] An embodiment of the present invention provides a hydrate-containing medium disturbance device, comprising:

[0006] a hydrate reactor body; and

[0007] The disturbance mechanism comprises a disturbance driving part and a lifting plate. The lifting plate is arranged inside the hydrate reactor body. The disturbance driving part drives the lifting plate to move up and down to squeeze and disturb the hydrate storage medium inside the hydrate reactor body.

[0008] The medium containing hydrates is inside the hydrate reactor body, and the hydrate reactor body provides a high-pressure environment. The lifting plate of the disturbance mechanism is driven by the disturbance drive unit to rise and fall inside the hydrate reactor body to squeeze and disturb the medium containing hydrates. The lifting plate is raised and lowered periodically to repeatedly squeeze the hydrate-containing medium, simulating the disturbance of formation activity, so that the hydrate-containing medium is decomposed by repeated changes in the mechanical stress inside it, and then the influence of the disturbance of formation activity on the equilibrium conditions of hydrate occurrence is studied.

[0009] In an optional embodiment, the hydrate-occurring medium disturbance device further comprises a tie rod and a support plate, one end of the tie rod is fixed to the bottom cover of the hydrate reactor body, and the other end of the tie rod is fixed to the support plate;

[0010] The disturbance driving part is fixed to the supporting plate.

[0011] In an optional embodiment, the disturbance drive unit includes a motor, a screw rod, a screw rod sleeve, a straightening frame and a lifting rod;

[0012] The straightening frame is slidably connected to the pull rod, and the screw rod sleeve is fixed to the straightening frame;

[0013] The motor is fixed to the support plate, the motor drives the lead screw, and the lead screw cooperates with the lead screw sleeve;

[0014] One end of the lifting rod is fixed to the uprighting frame, and the other end of the lifting rod is connected to the lifting plate.

[0015] In an optional embodiment, the motor drives the screw to rotate via a planetary reducer.

[0016] In an optional embodiment, the lifting plate is formed with a through hole;

[0017] The surface of the lifting plate is provided with a filter.

[0018] In an optional embodiment, the hydrate reactor body is configured with a top temperature control portion and a bottom temperature control portion;

[0019] The top temperature control part is located at the top of the hydrate reactor body, and the bottom temperature control part is located at the bottom of the hydrate reactor body;

[0020] The top temperature control part and the bottom temperature control part are configured to independently perform temperature control so that the internal temperature of the hydrate reactor body is distributed in a gradient in the vertical direction.

[0021] In an optional embodiment, the top temperature control part and the bottom temperature control part are temperature-controlled water tanks respectively disposed at the top and bottom of the hydrate reactor body;

[0022] The two temperature-controlled water tanks are respectively connected to external water chillers.

[0023] In an optional embodiment, a plurality of temperature sensors are disposed inside the hydrate reactor body, and the plurality of temperature sensors are distributed at intervals along the vertical direction.

[0024] In an optional embodiment, a viewing window is disposed on the side of the hydrate reactor body.

[0025] In an optional embodiment, a displacement meter is disposed on the top of the hydrate reactor body to measure the volume of the hydrate-hosting medium inside the hydrate reactor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 Schematic diagram of the structure of the hydrate storage medium disturbance device in this embodiment;

[0028] Figure 2 It is a schematic diagram of the principle of the hydrate-hosting medium disturbance device in this embodiment.

[0029] Icons: 10-hydrate storage medium disturbance device; 11-hydrate reactor body; 12-disturbance mechanism; 13-pull rod; 14-support plate; 15-top temperature control part; 16-bottom temperature control part; 17-temperature sensor; 18-visible window; 19-displacement meter;

[0030] 20-motor; 21-screw; 22-screw sleeve; 23-righting frame; 24-lifting rod; 25-sliding sleeve; 26-planetary reducer; 27-coupling;

[0031] 30-constant temperature control box; 31-gas storage tank; 32-solenoid valve; 33-hand valve; 34-exhaust port; 35-exhaust valve; 36-magnetic stirrer; 37-magnet;

[0032] 120 - disturbance driving unit; 121 - lifting plate; 122 - through hole; 123 - filter screen. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the embodiments of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the description of the embodiments of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0039] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0040] This embodiment provides a hydrate storage medium disturbance device 10, which can simulate the disturbance of formation activity to study the influence of the disturbance of formation activity on the hydrate storage equilibrium condition.

[0041] See also Figure 1 , Figure 1 Schematic diagram of the structure of the hydrate-containing medium disturbance device 10 in this embodiment.

[0042] The hydrate-hosting medium disturbance device 10 comprises a hydrate reactor body 11 and a disturbance mechanism 12 .

[0043] The disturbance mechanism 12 includes a disturbance driving unit 120 and a lifting plate 121 . The lifting plate 121 is disposed inside the hydrate reactor body 11 . The disturbance driving unit 120 drives the lifting plate 121 to move up and down to squeeze and disturb the hydrate-occurring medium inside the hydrate reactor body 11 .

[0044] In the present disclosure, the reaction conditions for water molecules and gas to change and form hydrates can be formed inside the hydrate reactor body 11. The hydrate reactor body 11 operates so that hydrates are formed in the porous medium to obtain a hydrate storage medium.

[0045] The lifting plate 121 is driven by the disturbance driving unit 120 to rise and fall inside the hydrate reactor body 11 to squeeze and disturb the porous medium containing hydrates. The lifting plate 121 is raised and lowered periodically to repeatedly squeeze the hydrate-containing medium, simulating the disturbance of formation activity, so that the hydrate-containing medium is decomposed by repeated changes in the mechanical stress inside it, and then the influence of the disturbance of formation activity on the equilibrium conditions of hydrate occurrence is studied.

[0046] See also Figure 2 , Figure 2 Schematic diagram of the principle of the hydrate-hosting medium disturbance device 10 in this embodiment.

[0047] In the present disclosure, the hydrate-containing medium disturbance device 10 further includes a tie rod 13 and a support plate 14, one end of the tie rod 13 is fixed to the bottom cover of the hydrate reactor body 11, and the other end of the tie rod 13 is fixed to the support plate 14. The disturbance driving unit 120 is fixed to the support plate 14.

[0048] The disturbance driving unit 120 includes a motor 20 , a screw rod 21 , a screw rod sleeve 22 , a straightening frame 23 and a lifting rod 24 .

[0049] The straightening frame 23 is slidably connected to the pull rod 13 , and the screw sleeve 22 is fixed to the straightening frame 23 .

[0050] The motor 20 is fixed to the support plate 14 , and the motor 20 drives the screw rod 21 , and the screw rod 21 cooperates with the screw rod sleeve 22 .

[0051] One end of the lifting rod 24 is fixed to the uprighting frame 23 , and the other end of the lifting rod 24 is connected to the lifting plate 121 .

[0052] The hydrate reactor body 11 is fixed on the base, and through the cooperation of the pull rod 13 and the support plate 14, sufficient installation space is provided for the motor 20, and at the same time, it is ensured that the disturbance driving part 120 can normally drive the lifting plate 121 to rise and fall.

[0053] In the present disclosure, the motor 20 drives the screw 21 to rotate, so that the uprighting frame 23 slides along the pull rod 13, thereby driving the lifting rod 24 to move up and down, and realizing the lifting and lowering of the lifting plate 121 inside the hydrate reactor body 11. By periodically controlling the forward and reverse rotation of the motor 20, the lifting and lowering of the lifting plate 121 is realized periodically, so as to repeatedly squeeze the hydrate storage medium and simulate the influence of the formation activity disturbance on the hydrate storage medium.

[0054] It should be noted that by controlling the rotation speed and direction of the motor 20 , the lifting plate 121 can be ensured to move accurately, and the data of simulated stratum activity disturbance can also be obtained by acquiring the data of the rotation speed and direction of the motor 20 .

[0055] It should be noted that in the present disclosure, the number of the tie rods 13 is two, and the two tie rods 13 are connected to the support plate 14 together to ensure that the motor 20 is in a stable working environment. At the same time, the righting frame 23 slides with the two tie rods 13 to ensure that the righting frame 23 is stably lifted and lowered under the drive of the screw 21, and to ensure that the lifting rod 24 on the righting frame 23 always moves in a vertical manner. A sliding sleeve 25 is provided between the righting frame 23 and the tie rod 13 to ensure that the righting frame 23 slides smoothly along the tie rod 13. The number of the lifting rods 24 is two, and the two lifting rods 24 are connected to the lifting plate 121 together to ensure that the lifting plate 121 stably supports the hydrate storage medium, and squeezes and disturbs the hydrate storage medium under the drive of the disturbance drive unit 120.

[0056] In the present disclosure, the output shaft of the motor 20 is connected to the planetary reducer 26 , and the planetary reducer 26 drives the screw 21 through the coupling 27 .

[0057] The planetary reducer 26 can reduce the rotation speed of the motor 20, increase the output torque, ensure the stable lifting of the lifting plate 121, and ensure the smooth progress of the simulation of stratum activity disturbance.

[0058] In order to simulate the situation in which liquid water flows into the hydrate storage medium under natural conditions, liquid water can be injected in advance between the lifting plate 121 and the inner bottom of the hydrate reactor body 11 according to actual experimental requirements.

[0059] In order to ensure that liquid water can flow into the hydrate-bearing medium, the lifting plate 121 is formed with through holes 122 , and a plurality of through holes 122 are dispersedly arranged on the lifting plate 121 .

[0060] In order to prevent the hydrate-containing medium from escaping from the through holes, a filter screen 123 is disposed on the surface of the lifting plate 121 .

[0061] In the present disclosure, the hydrate reactor body 11 is configured with a top temperature control portion 15 and a bottom temperature control portion 16 .

[0062] The top temperature control part 15 is located at the top of the hydrate reactor body 11 , and the bottom temperature control part 16 is located at the bottom of the hydrate reactor body 11 .

[0063] The top temperature control part 15 and the bottom temperature control part 16 are configured to independently perform temperature control so that the internal temperature of the hydrate reactor body 11 is distributed in a gradient in the vertical direction.

[0064] See also Figure 1A plurality of temperature sensors 17 are arranged inside the hydrate reactor body 11. The plurality of temperature sensors 17 are distributed at intervals along the vertical direction. The plurality of temperature sensors 17 can measure the temperature at different vertical positions inside the hydrate reactor body 11. The actual temperature at each position can be accurately calculated by the difference method.

[0065] The temperature inside the hydrate reactor body 11 is distributed in a gradient in the vertical direction by the independently controlled top temperature control unit 15 and bottom temperature control unit 16. When the hydrate reactor body 11 is working normally and generating hydrates, the gas hydrate formation law test under different temperature gradients can be realized, and the specific morphology, volume change law and water migration law of the hydrate formation process under different temperature gradient conditions can be analyzed in detail; when the disturbance mechanism 12 is working, the temperature distribution law in the vertical direction of the equilibrium conditions required for the stable existence of the hydrate-bearing medium can be calculated during the decomposition process of the disturbed hydrate-bearing medium.

[0066] In the present disclosure, the top temperature control part 15 and the bottom temperature control part 16 are temperature control water tanks respectively arranged at the top and bottom of the hydrate reactor body 11, and the two temperature control water tanks are respectively connected to external water chillers.

[0067] The top temperature control part 15 and the bottom temperature control part 16 are respectively supplied with hot water or cold water through their own water coolers to achieve the effect of independent temperature control.

[0068] See also Figure 1 and Figure 2 A visual window 18 is disposed on the side of the hydrate reactor body 11. An external camera can record the hydrate formation process and the hydrate storage medium decomposition process through the visual window 18. In the present disclosure, the camera can be a digital camera, but is not limited thereto.

[0069] In the present disclosure, a displacement meter 19 is disposed on the top of the hydrate reactor body 11 to measure the volume of the hydrate-containing medium inside the hydrate reactor body 11 .

[0070] The displacement meter 19 can measure the volume change of the hydrate-bearing medium inside the hydrate reactor body 11, that is, the displacement meter 19 measures the volume change law of the porous medium during the formation or decomposition of the hydrate, and then can analyze in detail the formation of hydrates under different temperature gradients, or the specific morphology, volume change law and water movement law during the decomposition process under different external mechanical disturbances. Among them, the displacement meter 19 can use a commercially available digital displacement meter 19, which is simple to operate and has more accurate results.

[0071] It should be noted that in this disclosure, Figure 1 .

[0072] The hydrate-occurring medium disturbance device 10 is arranged in a constant temperature control box 30 to prevent the external environment from affecting the temperature inside the hydrate reactor body 11, so that the temperature inside the hydrate reactor body 11 is kept constant to ensure the accuracy of the experimental results. The hydrate reactor body 11 is connected to the gas storage tank 31.

[0073] The gas in the gas storage tank 31 enters the hydrate reactor body 11. When the pressure in the hydrate reactor body 11 reaches a predetermined pressure, the gas entering the hydrate reactor body 11 can generate hydrates under a specific environment (predetermined gas, predetermined temperature) inside the hydrate reactor body 11.

[0074] The hydrate reactor body 11 is connected to the gas storage tank 31 through two parallel pipes, one of which is provided with a solenoid valve 32, and the other is provided with a hand valve 33. During the experiment, one of the valves can be opened, and the other valve remains closed. The solenoid valve 32 is easy to operate and can be used as a common valve, and the hand valve 33 can be used as a backup valve when the solenoid valve 32 fails to work normally.

[0075] The hydrate reactor body 11 is further provided with an exhaust port 34 , and the exhaust port 34 is provided with an exhaust valve 35 . The exhaust valve 35 is opened to release the pressure inside the hydrate reactor body 11 to decompose the hydrate.

[0076] In the present disclosure, a magnetic stirrer 36 is provided at the bottom of the hydrate reactor body 11, and a magnet 37 is provided inside the hydrate reactor body 11. The magnetic stirrer 36 can drive the magnet 37 to rotate, so as to stir the reactants inside the hydrate reactor body 11 to ensure the smooth formation of hydrates.

[0077] In a simulation experiment:

[0078] The hydrate reactor body 11 is filled with porous media, the top of the porous media is covered with a baffle, and a displacement meter 19 is placed in the middle of the baffle;

[0079] The hydrate reactor body 11 is in operation, and hydrates are formed inside the hydrate reactor body 11;

[0080] The motor 20 is turned on to raise the lifting plate 121. A mechanical stress sensor is placed in the porous medium to measure the effective stress inside the porous medium. After the stress value measured by the mechanical stress sensor reaches the experimental requirement, the motor 20 is operated to lower the lifting plate 121. After the effective stress inside the porous medium is reduced to the required value, the motor 20 is stopped to keep the lifting plate 121 stationary. Then, the above steps are repeated, that is, the operation of the motor 20 is repeated, so that the porous medium can be periodically squeezed and disturbed by external mechanical force.

[0081] After the disturbance process is completed, the lifting plate 121 is lowered to the lowest position, and the bottom temperature control unit 16 works to slowly and independently increase the temperature at the bottom of the reactor (hydrate reactor body 11), so that the hydrate-containing medium slowly decomposes layer by layer from bottom to top. It should be noted that the bonding force generated after the hydrate is formed will bond the porous medium into blocks. Even if the elevator falls to the lowest position, the porous medium containing hydrates can still be suspended in the reactor. Therefore, when the bottom temperature gradually increases, the porous medium will peel off layer by layer from bottom to top.

[0082] At this time, the external camera can record the complete decomposition process through the visual window 18, and the vertically installed temperature sensor 17 measures the temperature change at each position of the porous medium in the vertical direction. It should be noted that a pressure sensor can be provided inside the hydrate reactor body 11 to measure the pressure value inside the hydrate reactor body 11.

[0083] According to the decomposition position of the hydrate-bearing medium recorded by the camera, the temperature at different positions measured by the temperature sensor 17, and the pressure value measured by the pressure sensor, the temperature and pressure conditions of each peeling layer when the porous medium decomposes from bottom to top can be calculated, and then compared with the theoretical temperature and pressure values ​​required for the stable existence of the pure hydrate sample, the vertical distribution law of the equilibrium conditions in the entire medium containing hydrates can be obtained. Finally, the influence of different external mechanical disturbances on the thermodynamic equilibrium conditions required for the stable existence of hydrates in porous media can be studied in detail.

[0084] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydrate storage medium disturbance device, characterized in that: include: A hydrate reactor body, wherein a displacement meter is disposed on the top of the hydrate reactor body to measure the volume of the hydrate-containing medium inside the hydrate reactor body; as well as The disturbance mechanism comprises a disturbance driving unit and a lifting plate, wherein the lifting plate is formed with a through hole and a filter is arranged on the surface of the lifting plate; the lifting plate is arranged inside the hydrate reactor body, and the disturbance driving unit drives the lifting plate to move up and down to squeeze and disturb the hydrate-occurring medium inside the hydrate reactor body.

2. The hydrate-containing medium disturbance device according to claim 1, characterized in that: The hydrate-occurring medium disturbance device further comprises a tie rod and a support plate, one end of the tie rod is fixed to the bottom cover of the hydrate reactor body, and the other end of the tie rod is fixed to the support plate; The disturbance driving part is fixed to the supporting plate.

3. The hydrate-containing medium disturbance device according to claim 2, characterized in that: The disturbance driving unit includes a motor, a screw rod, a screw rod sleeve, a straightening frame and a lifting rod; The straightening frame is slidably connected to the pull rod, and the screw rod sleeve is fixed to the straightening frame; The motor is fixed to the support plate, the motor drives the screw rod, and the screw rod cooperates with the screw rod sleeve; One end of the lifting rod is fixed to the uprighting frame, and the other end of the lifting rod is connected to the lifting plate.

4. The hydrate-containing medium disturbance device according to claim 3, characterized in that: The motor drives the screw to rotate through a planetary reducer.

5. The hydrate-containing medium disturbance device according to claim 1, characterized in that: The hydrate reactor body is configured with a top temperature control part and a bottom temperature control part; The top temperature control part is located at the top of the hydrate reactor body, and the bottom temperature control part is located at the bottom of the hydrate reactor body; The top temperature control part and the bottom temperature control part are configured to independently perform temperature control so that the internal temperature of the hydrate reactor body is distributed in a gradient in the vertical direction.

6. The hydrate-containing medium disturbance device according to claim 5, characterized in that: The top temperature control part and the bottom temperature control part are temperature control water tanks respectively arranged at the top and bottom of the hydrate reactor body; The two temperature-controlled water tanks are respectively connected to external water coolers.

7. The hydrate-containing medium disturbance device according to claim 5, characterized in that: A plurality of temperature sensors are arranged inside the hydrate reactor body, and the plurality of temperature sensors are distributed at intervals along the vertical direction.

8. The hydrate-containing medium disturbance device according to claim 5, characterized in that: A viewing window is disposed on the side of the hydrate reactor body.

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