Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

• DOI: 10.3389/fmars.2022.1052802
• Publication Date: 2022-11-25T07:24:52Z
• Authors: Jin Guo; Qixiao Zhou; Yongqiang Ge; Haonan Li; Qiaoling Gao; Ying Wang; Yuan Lin; Jiawang Chen
• Keywords: Science; Q; 0211 other engineering and technologies; General. Including nature conservation, geographical distribution; 02 engineering and technology; QH1-199.5; pressure-retaining transfer; 6. Clean water; overlying seawater; sediment; numerical simulation; laboratory test

Methane leakage at the interface between sediment and overlying seawater is an important basis for gas hydrate exploration. Therefore, a transfer device with working pressure of 30MPa corresponding scheme are proposed to separate water inside sampler under condition pressure-retaining. Based on relief valve adjustable threshold pressure, transfers by compressing internal volume secondary sampling. The performance studied simulation experiment. coupled Eulerian-Lagrangian approach in Abaqus, sampling was investigated, penetration resistance coring rate tube 141N 86.2%, respectively. By using hydraulic software AMESim, fluctuation caused movement mechanism during process studied, amplitude within 0.89 MPa. Furthermore, laboratory tests were carried out high conditions, meantime, results verified. Under 30MPa, can maintain loss no more than 8.0% (2.4MPa) two hours, fluctuations 4.8% (1.44MPa), ensure that culture kettle decreases 4.7% relative after transfer, which shows feasibility application.