CN110992806A - Visual simulation device and method for hydrate generation decomposition and blockage mechanism - Google Patents
Visual simulation device and method for hydrate generation decomposition and blockage mechanism Download PDFInfo
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Abstract
The invention discloses a visual simulation device and a visual simulation method for a hydrate generation decomposition and blocking mechanism.A normal-pressure visual hydrate reaction system comprises a metal ball, a mounting frame, a metal detector and a transparent tube, wherein the transparent tube is sealed and can be used for containing hydrate slurry to be detected; the mounting frame and the transparent tube are arranged in the visual water bath, and the driving system is connected with the mounting frame; the probe of the first temperature sensor is arranged inside the transparent tube; the second temperature sensor is arranged in the visual water bath; the CCD imaging system is arranged outside the visual water bath and used for shooting the transparent tube. The method can realize real-time recording and analysis of the processes of generating, decomposing, aggregating and blocking the hydrate and the like under the normal pressure condition, and realize effective evaluation of the hydrate anti-agglomerant under the normal pressure condition.
Description
Technical Field
The invention belongs to the field of research on hydrate control in oil and gas exploitation, and particularly relates to a device and a method for visually simulating a hydrate generation decomposition and blockage mechanism.
Background
The gas hydrate is generally a clathrate solid substance formed by gas molecules such as methane, ethane, propane, and carbon dioxide and water molecules in a low-temperature and high-pressure environment. In the hydrate structure, gas molecules are stably enclosed in cage-shaped cavities formed by water molecules. In the drilling, exploitation and gathering and transportation processes of petroleum and natural gas, the generation of hydrates can cause the blockage of a shaft or a pipeline, cause the pause of production operation and bring serious risks of safety and environmental pollution. The traditional hydrate control is mainly based on a complete inhibition strategy, and comprises the measures of adding thermodynamic inhibitors (methanol, ethylene glycol and the like), coating an insulating layer on a pipeline and the like. However, the control method based on the complete inhibition strategy is high in cost, not environment-friendly and difficult to use and recover. In recent years, hydrate control strategies have gradually shifted from complete inhibition to risk management strategies. The key to the risk management strategy is to allow hydrate formation, but to inhibit hydrate crystals from agglomerating and causing blockages. The key to risk management is the use of low doses of hydrate inhibitors, and one of the hot spots in current research is hydrate anti-agglomerants. The use of the anti-agglomerant has a crucial influence on the processes of generation, decomposition, aggregation and the like of the hydrate.
The devices currently used for screening and evaluating hydrate anti-agglomerants are usually a high-pressure reaction kettle (Autoclave), a high-pressure swing tank (rock Cell), a large circulation device (Flow Loop) and a hydrate particle micro-force measuring instrument (MMF). The pressure-resistant conditions of the equipment required by the high-pressure reaction kettle and the high-pressure swing tank are harsh, the equipment investment is large, the experimental operation is complex, and the safety risk is high. The large-scale circulation device is more complex, occupies larger space, needs a large amount of simulation liquid and chemical agent in one test, and has higher input cost. A hydrate particle micro force measuring instrument (MMF) is commonly used for evaluating the performance of a hydrate anti-agglomerant, but the micro force measuring instrument cannot test the hydrate anti-agglomeration effect under the condition of fluid disturbance. In addition, Differential Scanning Calorimetry (DSC) can also evaluate the influence of the anti-agglomerant on the generation, decomposition and aggregation processes of hydrates in systems such as oil, methane, water and the like under high pressure, but DSC equipment is expensive and maintenance and operation costs are high.
Therefore, there is a need for a device that can evaluate the mechanism of hydrate formation, decomposition and plugging at a low cost and with simple operation.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a device and a method for visually simulating the generation, decomposition and blockage mechanisms of hydrates, which can realize real-time recording and analysis of the processes of generation, decomposition, aggregation, blockage and the like of the hydrates under normal pressure conditions and effectively evaluate hydrate anti-agglomerants under normal pressure conditions. The device can realize the rapid evaluation and screening of the hydrate anti-agglomerant in the operation process.
The technical solution adopted by the invention is as follows:
a visual simulation device for hydrate generation decomposition and blockage mechanism comprises a normal-pressure visual hydrate reaction system, a driving system, a low-temperature constant-temperature control system, a temperature acquisition system and a CCD imaging system, wherein the normal-pressure visual hydrate reaction system comprises a metal ball, a mounting frame, a metal detector and a transparent tube, the transparent tube is sealed, an inner cavity of the transparent tube is used for containing hydrate slurry to be detected, the metal ball is arranged in the transparent tube and can freely roll in the transparent tube, the transparent tube is mounted on the mounting frame, and the metal detectors for detecting the metal ball are mounted at two ends of the transparent tube on the mounting frame respectively; the low-temperature constant-temperature control system comprises a visual water bath, a mounting frame and a transparent pipe are arranged in the visual water bath, and a driving system is connected with the mounting frame and used for driving the mounting frame to swing; the temperature acquisition system comprises a first temperature sensor and a second temperature sensor, and a probe of the first temperature sensor is arranged inside the transparent tube and used for measuring the temperature of the hydrate slurry; the second temperature sensor is arranged in the visual water bath and used for measuring the temperature of the refrigerant externally connected with the transparent pipe; the CCD imaging system is arranged outside the visual water bath and used for shooting the transparent tube.
The driving system adopts an electric motor system and comprises an electric push rod, a link component, a program control box and a fixing pile, wherein the fixing pile is fixedly installed in a visual water bath, one end of a mounting rack is hinged to the fixing pile, the other end of the mounting rack is connected with the electric push rod through the link component, the program control box is connected with the electric push rod, the program control box is used for controlling the electric push rod to move, and the electric push rod can drive the mounting rack to swing around the hinge part with the fixing pile.
The link member employs a spring.
And a circulating liquid outlet and a circulating liquid inlet are arranged on the visual water bath and are respectively connected with the inlet and the outlet of the refrigerator.
The transparent tube is of a cylindrical structure, and two ports of the transparent tube are sealed and plugged by sealing plugs.
The visual water bath is established to the structure of double-deck organic glass with the earlier right one side of CCD imaging system, and the space between two-layer organic glass is sealed, and other side outer walls of visual water bath all are equipped with insulation material.
The simulation device further comprises a computer, and the first temperature sensor, the second temperature sensor, the metal detector and the CCD imaging system are all connected with the computer.
The transparent tube is a quartz tube.
The simulation method of the hydrate formation decomposition and blockage mechanism visualization simulation device comprises the following steps:
s1, filling the hydrate slurry to be tested into a transparent tube, and mounting the transparent tube on a mounting frame;
s2, driving the mounting frame to swing by using the driving system, driving the transparent tube to swing synchronously by using the mounting frame, and rolling the metal balls back and forth at two ends of the transparent tube; when the metal balls are arranged at the two ends of the transparent tube, the metal balls are detected by the metal detectors, and the time for the metal balls to move from one end of the transparent tube to the other end is obtained according to the time difference detected by the metal detectors at the two ends; the first temperature sensor detects the temperature of the hydrate slurry in the transparent pipe, the refrigerant in the visual water bath tank controls the temperature of the transparent pipe, and the second temperature sensor detects the temperature of the refrigerant in the visual water bath tank;
and S3, shooting the transparent tube by the CCD imaging system, and recording the processes of generating, decomposing, aggregating and blocking the hydrate in the quartz tube.
The hydrate slurry to be detected is a mixture of tetrahydrofuran aqueous solution and a hydrate inhibitor, or a mixture of tetrabutylammonium bromide aqueous solution and a hydrate inhibitor.
The invention has the following beneficial effects:
the visual simulation device for the hydrate generation decomposition and blockage mechanism can drive the mounting frame and the transparent pipe arranged on the mounting frame to swing according to the preset amplitude and frequency by using the driving system, the transparent pipe is provided with the metal ball, and the metal ball can roll back and forth between the two ends of the transparent pipe by swinging of the transparent pipe, so that the hydrate slurry to be detected in the transparent pipe can be disturbed by using the metal ball, and the flowing strength of the hydrate slurry to be detected is increased; the metal detector can be used for detecting the metal ball, the time length of the metal ball moving from one end of the transparent pipe to the other end can be obtained by utilizing the time difference recorded by the metal detectors at the two ends, and the fluidity of hydrate slurry in the reaction system can be reflected according to the movement time length; the first temperature sensor can measure the temperature change condition in the flowing process of the hydrate slurry; the visual water bath can provide stable and controllable working temperature for hydrate slurry, can be convenient for a CCD imaging system to shoot and record the flowing condition of the hydrate slurry in the transparent pipe in real time, can record the processes of generating, decomposing, aggregating and blocking the hydrate in the transparent pipe in real time, can realize the quick and effective evaluation of the hydrate anti-agglomerant under the conditions of normal pressure and flowing, and can determine the optimal using amount of the hydrate anti-agglomerant. The driving system is adopted to drive the transparent tube to perform swinging motion, so that the operation is simple, and the workload is greatly reduced; compared with the existing high-pressure reaction kettle, large-scale circulation equipment and the like, the energy consumption is reduced, the driving system drives the transparent pipe to swing, and the optimal chemical agent dosage can be quickly determined. In conclusion, the device can realize real-time recording and analysis of the processes of generating, decomposing, aggregating and blocking the hydrate and the like under the normal pressure condition, and effective evaluation of the hydrate anti-agglomerant under the normal pressure condition, and can realize rapid evaluation and screening of the hydrate anti-agglomerant in the operation process of the device.
Furthermore, the link component adopts a spring, and the spring can eliminate the influence caused by the horizontal displacement generated in the swinging process at the connecting end of the mounting frame and the electric push rod.
Furthermore, one side of the visual water bath tank, which is opposite to the CCD imaging system, is provided with a double-layer organic glass structure, the space between the two layers of organic glass is closed, and a double-layer organic glass window can improve the heat preservation performance and solve the problem of water vapor condensation in the experimental process; the outer walls of other sides of the visual water bath are all provided with heat insulation materials, so that the heat insulation performance can be improved.
Further, the transparent tube is a quartz tube. Other transparent tubes, such as ordinary glass tubes, are easily scratched after being used for a period of time, affect the observation effect, and are easily damaged when being slightly rubbed and bumped, so that the tubes are not suitable for use. The threads of the end of the polymer (such as polyethylene) transparent pipe are easy to wear, the sealing performance is poor, scratches are easy to generate, and the observation effect is influenced, so that the polymer (such as polyethylene) transparent pipe is not suitable for use. The quartz material is composed of single silicon dioxide component, has good light transmission and is beneficial to observation; the quartz material has high mechanical strength, the hardness can reach Mohs seven grade, the quartz material is not easy to scratch and break and is convenient for long-term use; in addition, the chemical stability and the cold and hot stability (low expansion coefficient) of the quartz material are good, so the transparent tube of the device is selected as the quartz tube.
The simulation device has the beneficial effects that the simulation method can reflect the fluidity of the hydrate slurry in the reaction system through the movement time of the metal ball in the transparent tube; the CCD imaging system is used for shooting and recording in real time, so that the processes of generating, decomposing, aggregating and blocking hydrates and the like in the transparent tube can be recorded in real time, the rapid and effective evaluation of the hydrate anti-agglomerant under the conditions of normal pressure and flowing is realized, the optimal using amount of the hydrate anti-agglomerant is determined, and the rapid evaluation and screening of the hydrate anti-agglomerant are realized; meanwhile, the simulation method is simple to operate, the workload is greatly reduced, and the simulation efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a simulation apparatus according to the present invention;
FIG. 2 is a schematic diagram of a relationship among positions of a quartz tube, an electric push rod and a visual water bath in the embodiment of the invention.
In the figure, 1 is a computer, 2 is a CCD imaging system, 3 is a metal detector connecting line, 4 is a first temperature sensor, 5 is a second temperature sensor, 6 is an electric push rod, 7 is a visual water bath, 8 is a program control box, 9 is a refrigerator, 10 is a metal ball, 11 is a transparent pipe, 12 is a mounting rack, 13 is a metal detector, 14 is a sealing plug, 15 is a spring, 16 is a fixing pile, 17 is a circulating liquid outlet, 18 is a circulating liquid inlet,
Detailed Description
The invention is further described below with reference to the figures and examples.
Referring to fig. 1 and 2, the hydrate generation decomposition and blocking mechanism visualization simulation device comprises a normal pressure visualization hydrate reaction system, a driving system, a low temperature constant temperature control system, a temperature acquisition system and a CCD imaging system, wherein the normal pressure visualization hydrate reaction system comprises a metal ball 10, an installation frame 12, a metal detector 13 and a transparent tube 11, the transparent tube 11 is sealed, an inner cavity of the transparent tube 11 is used for accommodating hydrate slurry to be detected, the metal ball 10 is arranged in the transparent tube 11 and can freely roll in the transparent tube 11, the transparent tube 11 is installed on the installation frame 12, and the metal detectors 13 for detecting the metal ball 10 are respectively installed at two ends of the transparent tube 11 on the installation frame 12; the low-temperature constant-temperature control system comprises a visual water bath 7, an installation frame 12 and a transparent pipe 11 are arranged in the visual water bath 7, and a driving system is connected with the installation frame 12 and used for driving the installation frame 12 to swing; the temperature acquisition system comprises a first temperature sensor 4 and a second temperature sensor 5, wherein a probe of the first temperature sensor 4 is arranged inside the transparent tube 11 and is used for measuring the temperature of the hydrate slurry; the second temperature sensor 5 is arranged in the visual water bath 7 and used for measuring the temperature of the refrigerant externally connected with the transparent pipe 11; the CCD imaging system is arranged outside the visual water bath 7 and used for shooting the transparent tube 11.
Referring to fig. 1 and 2, the driving system adopts an electric motor system and comprises an electric push rod 6, a link component 15, a program control box 8 and a fixing pile 16, wherein the fixing pile 16 is fixedly installed in the visual water bath 7, one end of a mounting frame 12 is hinged with the fixing pile 16, the other end of the mounting frame 12 is connected with the electric push rod 6 through the link component 15, the program control box 8 is connected with the electric push rod 6, the program control box 8 is used for controlling the action of the electric push rod 6, and the electric push rod 6 can drive the mounting frame 12 to swing around the hinge component with the fixing pile 16.
Referring to fig. 2, as a preferred embodiment of the present invention, a spring is used as the link member 15.
Referring to fig. 1 and 2, a circulating liquid outlet 17 and a circulating liquid inlet 18 are arranged on the visual water bath 7 as a preferred embodiment of the invention, and the circulating liquid outlet 17 and the circulating liquid inlet 18 are respectively connected with an inlet and an outlet of the refrigerator 9.
Referring to fig. 1 and 2, a transparent tube 11 is a cylindrical structure, and both ends of the transparent tube 11 are sealed and closed by a sealing plug 14.
As a preferred embodiment of the invention, one side of the visual water bath 7, which is opposite to the CCD imaging system, is provided with a double-layer organic glass structure, the space between the two layers of organic glass is closed, and the outer walls of other side surfaces of the visual water bath 7 are provided with heat insulation materials.
Referring to fig. 1, the simulation apparatus of the present invention further includes a computer 1, and the first temperature sensor 4, the second temperature sensor 5, the metal detector 13 and the CCD imaging system are connected to the computer.
As a preferred embodiment of the present invention, the transparent tube 11 is a quartz tube, and the metal ball 10 is a stainless steel ball.
The simulation method of the hydrate formation decomposition and blockage mechanism visualization simulation device comprises the following steps:
s1, filling hydrate slurry to be tested into the transparent tube 11, and installing the transparent tube 11 on the installation frame 12;
s2, driving the mounting rack 12 to swing by using the driving system, driving the transparent tube 11 to swing synchronously by the mounting rack 12, and rolling the metal balls 10 back and forth at the two ends of the transparent tube 11; when the metal balls 10 are arranged at the two ends of the transparent tube 11, the metal balls 10 are detected by the metal detectors 13, and the time taken for the metal balls 10 to move from one end of the transparent tube 11 to the other end is obtained according to the time difference detected by the metal detectors 13 at the two ends; the first temperature sensor 4 detects the temperature of the hydrate slurry in the transparent pipe 11, the refrigerant in the visual water bath 7 controls the temperature of the transparent pipe 11, and the second temperature sensor 5 detects the temperature of the refrigerant in the visual water bath 7;
s3, the CCD imaging system shoots the transparent tube 11 and records the generation, decomposition, aggregation and blockage processes of the hydrate in the quartz tube 11.
The hydrate slurry to be detected is a mixture of a tetrahydrofuran aqueous solution and a hydrate inhibitor, or a mixture of a tetrabutylammonium bromide aqueous solution and a hydrate inhibitor.
Examples
As shown in fig. 1-2, the hydrate formation decomposition and blocking mechanism visualization simulation apparatus of the present embodiment includes a normal pressure visualization hydrate reaction system, an electric motor system, a low temperature and constant temperature control system, a temperature acquisition system, and a CCD imaging system 2; the normal-pressure visual hydrate reaction system comprises a visual quartz tube, a stainless steel ball, a sealing plug 14, a metal protection frame and metal detectors 13, wherein the metal protection frame is used as an installation frame, a first temperature sensor 4 and a second temperature sensor 5 are adopted in a temperature acquisition system, the first temperature sensor 4 and the second temperature sensor 5 adopt thermocouples, and the metal detectors 13 are arranged on the metal protection frame and positioned at two ends of the quartz tube; the temperature probe of the first temperature sensor 4 is embedded in the sealing plug 14 and used for tracking the temperature change of a hydrate reaction system in the quartz tube, and the tracked temperature is connected to the computer 1 through a sensing wire; the electric motor system comprises an electric push rod 6, a program control box 8, an electric push rod 6 and the program control box 8, wherein the electric push rod 6 is connected with the program control box 8, the lower end of the electric push rod 6 is connected with the right end of a metal protection frame through a spring 15, the left end of the right end of the metal protection frame is hinged with the upper end of a fixing pile 16, the fixing pile 16 is fixed in a visual water bath 7, the program control box 8 can adjust the stroke, the speed and the frequency of the telescopic motion of the electric push rod 6, and the electric push rod 6 drives a reaction system (a quartz; the low-temperature constant-temperature control system comprises a refrigerator 9, a visual water bath 7 and a circulating pipe, and the system provides stable and controllable working temperature for the hydrate reaction system; the second temperature sensor 5 can monitor the temperature of the refrigerant in the visual water bath 7 in real time, and the first temperature sensor 4 and the second temperature sensor 5 can store the detected temperature in the computer 1 in real time; the CCD imaging system (2) is aligned to a light-transmitting surface on the visual water bath 7, the processes of hydrate generation, decomposition, aggregation, blockage and the like in the quartz tube are recorded in real time, and recorded image and video data are stored in the computer 1.
The length multiplied by the width multiplied by the height of the visual water bath 7 is 50cm multiplied by 30cm multiplied by 40cm, the upper bottom surface of the visual water bath 7 is provided with an opening, the front surface is double-layer organic glass (the size is 50cm multiplied by 40cm), the CCD imaging system can conveniently record video, and the other side surfaces and the bottom surface are made of stainless steel materials; the water bath has a circulation liquid outlet 17 and a circulation liquid inlet 18, which are connected to the inlet and outlet of the refrigerator 9 by rubber pipes, respectively. The temperature control range of the refrigerator 9 is-20 ℃ to 90 ℃, and the temperature control precision is +/-0.1 ℃. And a layer of soft heat-insulating material is adhered to the outer wall of the aluminum alloy and the outer wall of the rubber pipe.
The interval of double-layer organic glass is 1cm, and the space between two-layer organic glass is sealed, has built-in silica gel drier, and outer organic glass temperature is close the air, prevents the problem of vapor condensation adhesion in the air.
The quartz tube had an inner diameter of 1.27cm, an outer diameter of 2.27cm and a volume of 20 mL. A stainless steel ball is arranged in the quartz tube, and the diameter of the stainless steel ball is 1.0cm, so that extra fluid disturbance can be provided during oscillation.
The mixture of 10mL of tetrahydrofuran solution and hydrate inhibitor or the mixture of 10mL of tetrabutylammonium bromide solution and hydrate inhibitor is loaded in the quartz tube, the two ends of the quartz tube are sealed by a rubber gasket and a sealing plug, and then the quartz tube is fixed on a clamping groove of a metal protective frame. The left end of the metal protection frame is connected to the fixing pile 16 through a rotatable shaft, and the right end of the metal protection frame 12 is connected to the electric push rod 6 through a spring 15 with certain strength.
The telescopic motion speed, the stroke and the telescopic motion frequency of the telescopic rod of the electric push rod 6 can be freely adjusted. In the device, an electric push rod 6 is fixed on a working table, the telescopic motion speed of an electric push rod telescopic rod set by a program control box 8 is 92mm/s, the stroke is 150-250mm, the pushing/pulling force is 100N, and the telescopic frequency is 15 times/minute. The telescopic rod of the electric push rod 6 drives the right end of the metal protection frame to move up and down back and forth, and in the process, fluid and the stainless steel ball in the quartz tube move back and forth to two ends in the quartz tube so as to simulate the flowing state of the pipeline. In the experimental process, the quartz tube takes the left end as the center, and the maximum inclination angle of the up-down back-and-forth rotation is +/-45 degrees. Two metal detectors 13 at two ends of the quartz tube are used for recording the time taken by the stainless steel ball to move from one end of the quartz tube to the other end, and the time data is transmitted to the computer 1.
The simulation device of the embodiment specifically comprises the following operation steps:
loading a mixture of a tetrahydrofuran aqueous solution and a hydrate inhibitor and a stainless steel ball into a quartz tube, or loading a mixture of a tetrabutyl ammonium bromide aqueous solution and a hydrate inhibitor and a stainless steel ball into a quartz tube, tightly sealing the quartz tube by using a sealing plug 14, placing a temperature probe of a first temperature sensor 4 into the sealing plug, contacting the top end of the temperature probe with the inner cavity of the quartz tube so as to record the temperature change of fluid in the quartz tube, and transmitting temperature data to a computer 1;
fixing a sealed quartz tube loaded with a hydrate generation system in a metal protection frame, wherein the left side of the metal protection frame is fixed on a fixing pile 16 in a visual water bath 7 through a rotatable bolt, and the right end of the metal protection frame is connected with the lower end of an electric push rod 6 through a spring 15; the metal protective frame is provided with a metal inductor 13 for recording the time taken by the stainless steel ball to move from one end of the quartz tube to the other end, and the metal inductor 13 is connected with the computer 1;
thirdly, a rubber pipe connected between the visual water bath 7 and the refrigerator 9 is connected, ethylene glycol circulating liquid with a certain liquid level is filled in the visual water bath 7 and the refrigerator 9, the top end of a temperature probe on the second temperature sensor 5 is extended to about 5 centimeters below the liquid level, and the second temperature sensor 5 is connected with the computer 1;
opening a program control box 8 in the electric motor system, setting parameters such as the telescopic motion stroke, the speed, the frequency and the like of the electric push rod, starting the electric push rod 6 to drive the quartz tube to rotate up and down and back and forth by taking the left end as the center, wherein the maximum inclination angle of the quartz tube is +/-45 degrees in the rotating process; the electric push rod is integrally fixed on the experiment table, the electric push rod instrument is not moved in the test process, and the telescopic rod of the electric push rod instrument stretches back and forth;
step five, opening the refrigerator 9, setting the working temperature and the cooling rate, and starting the circulating refrigeration;
and step six, opening the CCD imaging system 2 to align the visual reaction system, recording the processes of hydrate generation, decomposition, aggregation blockage and the like in the quartz tube in real time, and storing the photographing and video information to a computer.
The method can be used for the visual research of the generation and decomposition of the hydrate and the pipeline blockage mechanism under the indoor normal pressure condition, provides effective data and reference for the blockage formation mechanism of the hydrate in the pipeline, and can simulate the influence of a hydrate inhibitor on the blockage formation process of the hydrate.
Claims (10)
1. The visual simulation device for the hydrate generation decomposition and blockage mechanism is characterized by comprising a normal-pressure visual hydrate reaction system, a driving system, a low-temperature constant-temperature control system, a temperature acquisition system and a CCD imaging system, wherein the normal-pressure visual hydrate reaction system comprises a metal ball (10), an installation frame (12), a metal detector (13) and a transparent pipe (11), the transparent pipe (11) is sealed, an inner cavity of the transparent pipe (11) is used for installing hydrate slurry to be detected, the metal ball (10) is arranged in the transparent pipe (11) and can freely roll in the transparent pipe (11), the transparent pipe (11) is installed on the installation frame (12), and the metal detectors (13) used for detecting the metal ball (10) are respectively installed at the positions of the two ends of the transparent pipe (11) on the installation frame (12); the low-temperature constant-temperature control system comprises a visual water bath (7), an installation frame (12) and a transparent pipe (11) are arranged in the visual water bath (7), and a driving system is connected with the installation frame (12) and used for driving the installation frame (12) to swing; the temperature acquisition system comprises a first temperature sensor (4) and a second temperature sensor (5), wherein a probe of the first temperature sensor (4) is arranged inside the transparent tube (11) and is used for measuring the temperature of the hydrate slurry; the second temperature sensor (5) is arranged in the visual water bath (7) and is used for measuring the temperature of the refrigerant externally connected with the transparent pipe (11); the CCD imaging system is arranged outside the visual water bath (7) and used for shooting the transparent tube (11).
2. The visual simulation device for the hydrate formation decomposition and blockage mechanism according to claim 1, wherein the driving system adopts an electric motor system and comprises an electric push rod (6), a link component (15), a program control box (8) and a fixed pile (16), the fixed pile (16) is fixedly installed in the visual water bath (7), one end of a mounting frame (12) is hinged to the fixed pile (16), the other end of the mounting frame (12) is connected with the electric push rod (6) through the link component (15), the program control box (8) is connected with the electric push rod (6), the program control box (8) is used for controlling the electric push rod (6) to act, and the electric push rod (6) can drive the mounting frame (12) to swing around a hinged part with the fixed pile (16).
3. The visual simulation device for hydrate formation decomposition and blockage mechanism according to claim 2, wherein the linking component (15) is a spring.
4. The hydrate formation decomposition and blockage mechanism visualization simulation device according to claim 1, wherein the visualization water bath (7) is provided with a circulating liquid outlet (17) and a circulating liquid inlet (18), and the circulating liquid outlet (17) and the circulating liquid inlet (18) are respectively connected with an inlet and an outlet of the refrigerator (9).
5. The visual simulation device for the hydrate generation decomposition and blockage mechanism according to claim 1, wherein the transparent tube (11) is of a cylindrical structure, and two ports of the transparent tube (11) are sealed and blocked by sealing plugs (14).
6. The hydrate formation decomposition and blockage mechanism visualization simulation device according to claim 1, wherein one side of the visualization water bath (7) which is aligned with the CCD imaging system in advance is of a double-layer organic glass structure, the space between the two layers of organic glass is closed, and the outer walls of other side surfaces of the visualization water bath (7) are provided with heat insulation materials.
7. The visual simulation device for the hydrate formation decomposition and blockage mechanism according to claim 1, further comprising a computer (1), wherein the first temperature sensor (4), the second temperature sensor (5), the metal detector (13) and the CCD imaging system are all connected with the computer.
8. The visual simulation device for the hydrate formation decomposition and blockage mechanism according to claim 1, wherein the transparent tube (11) is a quartz tube.
9. A simulation method of a hydrate formation decomposition and plugging mechanism visualization simulation device based on any one of claims 1 to 8, characterized by comprising the following steps:
s1, filling hydrate slurry to be measured into a transparent tube (11), and installing the transparent tube (11) on an installation frame (12);
s2, driving the mounting rack (12) to swing by using the driving system, driving the transparent tube (11) to swing synchronously by the mounting rack (12), and rolling the metal balls (10) back and forth at the two ends of the transparent tube (11); when the metal balls (10) are arranged at the two ends of the transparent tube (11), the metal balls (10) are detected by the metal detectors (13), and the time for the metal balls (10) to move from one end of the transparent tube (11) to the other end is obtained according to the time difference detected by the metal detectors (13) at the two ends; the first temperature sensor (4) detects the temperature of the hydrate slurry in the transparent pipe (11), the refrigerant in the visual water bath (7) controls the temperature of the transparent pipe (11), and the second temperature sensor (5) detects the temperature of the refrigerant in the visual water bath (7);
s3, the CCD imaging system shoots the transparent tube (11) and records the processes of generating, decomposing, aggregating and blocking the hydrates in the quartz tube (11).
10. The simulation method according to claim 9, wherein the hydrate slurry to be tested is a mixture of an aqueous tetrahydrofuran solution and a hydrate inhibitor, or a mixture of an aqueous tetrabutylammonium bromide solution and a hydrate inhibitor.
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| Publication number | Priority date | Publication date | Assignee | Title |
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