Abstract
Precise pressure core motion, including translation and rotation, is the basis and core part of the Analysis and Transfer System of Natural Gas Hydrate Pressure Core, which is crucial to nondestructive analyses, core cutting, and transfer. This paper mainly proposes a driving device, whereby a pressure core, up to 3 m long, can be transferred from pressure core drilling tools to proceed to nondestructive analyses and transferring the cores into other chambers. The lead screw is one of the most important components of this driving device. Therefore, the modal analyses of the lead screw are performed, which can help researchers to analyze the stability of this device. The analyzed data shows that the different positions of the slider have a great impact on the natural frequency of the lead screw. Furthermore, the lead screw with a support slider has a larger natural frequency than that without a support slider. According to data analysis, we can derive that the device with the support slider has a much larger rigidity, which can contribute to the stability of the device. To verify the feasibility of this device, the deformation of the lead screw was tested by the Micro-Electro-Mechanical Systems (MEMS) accelerometer array. Experimental results show that the deformation of the lead screw with the support slider is much less than that without the support slider.
Highlights
Natural gas hydrate is regarded as a kind of potential energy source, since it has several preponderant characteristics, such as high energy density and cleanliness, large reserve, shallow burial, among others [1,2]
The analysis and processing system applied for the natural gas hydrate pressure core is being developed rapidly by research centers from all over the world, which can help scientists understand the physical and chemical properties, and the geological structure [4]
The precise translational and rotational capability of pressure core ensures that complex structural features can be tested in detail through high-resolution X-ray and sonic wave
Summary
Natural gas hydrate is regarded as a kind of potential energy source, since it has several preponderant characteristics, such as high energy density and cleanliness, large reserve, shallow burial, among others [1,2]. Under the standard conditions of recovery, natural gas would break down into large volumes of methane and water, which has an enormous influence on marine geological change, climate change, drilling safety, and so on. Recovery in situ pressure can ensure the authenticity of the cores to the greatest extent, by which the pressure core is taken in geological formations [3]. The analysis and processing system applied for the natural gas hydrate pressure core is being developed rapidly by research centers from all over the world, which can help scientists understand the physical and chemical properties, and the geological structure [4]. The MSCL system can be applied to pressure cores or seafloor sediments. It can quickly acquire high-resolution data from pressure cores or seafloor
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