文献类型：期刊文献

英文题名：Weakly cemented similar materials for in-situ desanding research on solid fluidization exploitation of natural gas hydrate

作者：Huang, Yuan[1];Du, Junqiao[4];Zheng, Jiayu[2];Zhao, Jinchao[2];Zhang, Yanhong[2];Su, Bi[1];Wu, Jiwei[3];Wang, Hualin[2]

机构：[1]Shanghai Univ, Inst Environm Pollut & Hlth, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[3]Sichuan Univ, Coll Carbon Neutral Future Technol, Sichuan 610065, Peoples R China;[4]China Aerosp Construction Engn Grp Co Ltd, Beijing 100071, Peoples R China

年份：2023

卷号：35

外文期刊名：GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT

收录：;EI(收录号：20233114480746);WOS:【SCI-EXPANDED(收录号:WOS:001058417100001)】；

基金：We would like to thank for the sponsorship of National Natural Science Foundation of China (52000071) , National Key Research and Development Program of China (2019YFC0312302) , and Open Fund (PLN2021-10) of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) .

语种：英文

外文关键词：Natural gas hydrate; Weakly cemented particle; Similar material; Triaxial compression test; Response surface analysis; In-situ desanding; Solid fluidization exploitation

摘要：In the process of natural gas hydrate (NGH) trial production by means of solid fluidization exploitation (SFE) and depressurization, the trial production was interrupted due to severe sand removal. In-situ sand removal is an effective solution. However, it is very difficult to directly use real or synthetic weakly cemented NGH materials to conduct the experiment of in-situ desanding. This work prepared the weakly cemented similar material particles (WCSMPs) that employed hydrophilic polyethylene (PE) and quartz to simulate hydrate and argillaceous silt respectively. The mechanical strength of WCSMPs was adjusted using cement as the adhesive and by adding chloride salt solutions to enhance the hydration of the cement. The microscopic pore structure and cementation state of WCSMPs were observed by SEM and MIP. Splitting test and triaxial compression test were used to explore the effect of the chlorine salt type, weight ratio of salt to cement (Msalt/Mcement), material ratio, and curing age on the mechanical properties of WCSMPs, such as tensile strength, compressive strength, cohesive strength, and internal friction angle. By taking the Msalt /Mcement and material ratio as dependent variables, multiple linear regression models of the tensile strength, cohesive strength, and internal friction angle of WCSMPs were established. The interaction law of the Msalt /Mcement and material ratio with the mechanical properties of WCSMPs was obtained. The experimental results showed that the tensile strength, compressive strength, internal friction angle and cohesive strength of the NaCl-WCSMPS were 0.18-0.42 MPa, 1.82-4.57 MPa, 33.1-34.8 degrees and 0.50-1.19 MPa respectively at the curing age of 7d. All the mechanical indexes are in line with the numerical range of submarine hydrate-bearing sediments (HBS).& COPY; 2023 Published by Elsevier Ltd.