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Research and Analysis of 30-m Gravity Piston Corer for Natural Gas Hydrate

机译：30 m重力式天然气水合物活塞芯的研究与分析

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摘要

The use of natural gas hydrate as a strategic alternative energy has increasingly attracted the attention of researchers in related fields. To study the properties of natural gas hydrate, however, obtaining the cores under in-situ pressure is a prerequisite because the cores are under particular combinations of high-pressure and low-temperature storage conditions. This article mainly presents the mechanism of a gravity piston corer in acquiring the pressure core of natural gas hydrate (up to 30 m long). The sampling theoretical model is established, and the corer's motion equation is thereafter derived. Based on the theoretical model, the penetration process of the gravity piston corer into the submarine sediment is analyzed. The weight, inner diameter, outer diameter, and initial speed, which are factors affecting the sampling process, are comprehensively elaborated. Additionally, the sampling process is numerically simulated using ABAQUS finite element software. It is found that the soil and pipe are influenced back by their coupling action, thus affording theoretical and numerical bases for the design and installation of a seabed operation structure. In its verification deployment in the South China Sea, the corer was operated numerous times at different depths; it successfully extracted pressure cores of natural gas hydrate. The theory and sea trails employed in this study are anticipated to support further research on abyssal pressure core corers.
机译：将天然气水合物用作战略性替代能源已越来越引起相关领域研究人员的关注。然而，为了研究天然气水合物的性质，在原位压力下获得岩心是前提条件，因为岩心处于高压和低温存储条件的特定组合下。本文主要介绍重力活塞式取芯器获取天然气水合物（最长30 m）压力芯的机理。建立采样理论模型，然后推导corer的运动方程。在理论模型的基础上，分析了重力活塞芯对水下沉积物的渗透过程。对影响采样过程的因素重量，内径，外径和初始速度进行了详细阐述。此外，使用ABAQUS有限元软件对采样过程进行了数值模拟。研究发现，土与管的耦合作用会对其产生影响，从而为海底作业结构的设计和安装提供理论和数值基础。在南中国海的核查部署中，corer在不同深度进行了无数次操作。它成功地提取了天然气水合物的压力岩心。预计本研究中使用的理论和海道将支持对深层压力岩心的进一步研究。

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