Marine gas hydrate dynamics three-axis simulation test system

Marine gas hydrate dynamics three-axis simulation test system
- ?? ?? - - < Marine gas hydrate dynamics three-axis simulation test system, mainly used
- ?? ?? - - Simulate the formation of gas hydrates and study
- ?? ?? - - Hydrate dynamics and underground hydrocarbon gas hydrate as a potentially useful mineral and its compositional instability
- ? ? ?? - - . It can also be used to study the hydrate nucleation mechanism
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- ?? ?? - - Hydrate growth conditions and stable environment are related to sedimentary origin, petrogenesis, groundwater and heat. Certain characteristics of field formation.
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- ?? ?? - - Mainly used for dynamic and static triaxial tests on hydrate-containing sediments, and can apply different conditions to undecomposed hydrate formation samples. Dynamic and static loads are measured, and stress, strain, pore pressure, and confining pressure are measured, so as to make quantitative judgments on the changes in relevant performance indicators of hydrate-containing sediments. It is also used to determine the shear strength test and soil dynamics test of soil in low temperature environments. It is also used to determine the total, shear strength and effective shear strength parameters of fine-grained soil and sandy soil. According to different drainage conditions, the following tests should be able to be completed:
, constant rate stress controlled loading test
, constant rate strain controlled loading test
stress cyclic loading test
, ambient low temperature test< br/>, dynamic performance test.
This test system adopts the multi-channel electro-hydraulic servo controller (r) with microcomputer controlled electro-hydraulic servo dynamic (fatigue) test control technology as the core, which is patented by Lichuang Company and has been protected by the State Intellectual Property Office (patent number:). , the system is stable, has excellent performance, is synchronized with the world, and is easy to operate.
The test software works in the /Chinese environment, has powerful data processing functions, automatically saves test conditions and test results, displays and prints random group test data, test curves, and test reports that comply with relevant national standards. It is widely applicable It is an ideal and cost-effective test equipment for scientific research institutes, metallurgical construction, national defense and civil air defense, colleges and universities, machinery manufacturing, transportation and other industries.
Main technical indicators and requirements
, Maximum dynamic load of axial vibration:
. Average load fluctuation: better than
. Load amplitude fluctuation: better than.
, axial vibration static maximum load:
. Static load accuracy: better than
. Load classification:,,, third gear.
Axial deformation: The axial static strain speed is adjustable (the range is.) The axial static stress speed is adjustable (the range is / /).
. Deformation accuracy: better than
. Deformation range
. Strain measurement reach:
, axial exciter displacement:
. Stroke:
.Total range of displacement sensor
.Displacement accuracy: better than.
, Sample size:
, Test waveform: sine wave, triangle wave, square wave
, Axial excitation frequency:
, Triaxial pressure chamber confining pressure:, accurate The accuracy is better than
, the pore pressure measurement range is:, and the accuracy is better than.
Measuring range of gas inflow and outflow hydrated sediment sample:.
, the total flow rate of the oil source system is 3/. The system pressure is.
, Test measurement control system
Multi-channel, multi-parameter fully digital closed-loop control, automatically adjusting system values, using high-resolution feedback sampling and signal conditioning technology, all channels (
, 3< br/>,
) all perform synchronous feedback and data collection at a rate.
Multiple servo closed-loop control methods such as force (stress), deformation (strain), and displacement can be selected to provide smooth and smooth control between force (stress), deformation (axial strain), displacement, and confining pressure. switch.
Computer fully digital display
, 3
,
and other engineering quantities, multi-channel parallel independent completion of measurement, display, control tasks.
, Low temperature environment test system
. Test environment temperature: -℃ room temperature
. Temperature measurement accuracy: .℃
. Temperature gradient: not greater than ℃ within the gauge distance.
The testing machine control system can automatically calibrate the accuracy of the testing machine and automatically adjust zero.
The system will automatically save the test conditions, parameter settings and test results.
, test control software, runs in the environment, has a friendly interface and is simple to operate. It can complete the setting of test conditions, sample parameters, etc. and test data processing. The test data can be saved in a variety of file formats. After the test, the data It can be imported into various software such as , and processed. After the test is completed, the data can be analyzed and processed, and the test report can be printed out.
The system has overload, damage protection and frequency setting functions.
Result: This test system
Through a series of simulation tests
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the methane hydrate formation process, kinetic factors and its carbon dioxide hydrate were studied nucleation process.
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Methane hydrate formation kinetics experiments show that
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High-frequency vibration can shorten the induction time of methane hydrate formation and accelerate hydrate formation. The generation rate has a significant promotion effect. The temperature rise and instantaneous flow rate increase in the hydrate formation reaction correspond very well to the high-frequency vibration time. Temperature and pressure are important factors affecting hydrate formation. In methane
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Natural seawater system and methane
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Natural seawater
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The isobaric temperature and isothermal pressure varying experiments conducted in two porous media systems show that
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The formation rate of methane hydrate is fast in a low-temperature and high-pressure environment
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The hydrate has high purity. The experimental results of methane hydrate formation in four porous media based on the particle size range
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show that
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the pores with coarser particle sizes The capillary action between pores caused by the medium will not have an obvious hindering effect on methane hydrate
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However, the calculation results show that
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Porous media with pore sizes smaller than
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will hinder the formation of methane hydrate. Research on the salt discharge effect when methane hydrate is generated in natural seawater
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shows that the salt discharge effect
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The strength of methane gas is mainly determined by the amount of material supplied to the reaction
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The greater the amount of methane gas supplied, the stronger the salt discharge effect. Six main ions affected by the salt expulsion effect
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,
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,
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,
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,
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,
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Medium
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,
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Ion The concentration changes greatly
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The change is minimal. The resistance method was used to analyze the nucleation process of carbon dioxide hydrate and it was found that
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The nucleation process of hydrate will cause the internal resistance of the system to increase. The impedance has the following relationship with temperature and nucleation rate
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In addition
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In the study of the nucleation process of carbon dioxide hydrate, it was found that the formation of hydrate The water molecules of the substance have a memory effect
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When the same water sample is used to repeatedly generate hydrates under the same experimental conditions, the induction time of the reaction becomes shorter and shorter.