化工进展2023，Vol.42Issue(12)：6251-6258,8.DOI:10.16085/j.issn.1000-6613.2023-0698
含粉砂及盐体系甲烷水合物二次生成规律
Reformation rules of methane hydrates in the presence of fine-grain sand and salt
摘要
Abstract
With the development of gas hydrate exploitation in the deep sea,there is an urgent need to solve basic problems,such as the reformation of hydrate and sand production in the wellbore.At present,there are few research reports on the reformation of hydrate in a stirred system containing fine-grain sands.By selecting fine-grain sand with size of 3.7-10.3μm,changing the sand concentration(0.6%,1.6%and 5.0%),salt concentration(0.1%,0.6%and 1.0%)and sand salt ratio,the influence of sand and salt on the secondary formation kinetics of methane clathrate under high pressure(8MPa)was studied.The results show that:① compared to the primary induction period,the shortened time of the secondary induction period increased with the decrease of sand particle size within the range of 3.7-10.3μm;② The fine-grain sand at concentrations of 0.6%and 1.6%promoted the secondary nucleation of hydrates;③ In the range of 0.1%to 1.0%salt concentration,the higher the salt concentration,the closer the final gas consumption and maximum gas consumption rate of the primary and secondary generation of hydrates were,and the more significant the inhibitory effect of salt on the"memory effect"of hydrates was;④ Under the conditions of low(0.6%∶0.1%),medium(1.6%∶0.6%),and high(5.0%∶1.0%)salt sand concentration ratios,as the sand salt ratio increased,the induction period for primary hydrate formation shortened,and the induction period for secondary hydrate formation increased.All systems had shorter induction periods for secondary formation than the induction period for primary formation,and as the ratio increased,the difference between the two induction periods decreased.It was concluded that sand particles could promote reformation kinetics in the stirring system,while salt would inhibit reformation kinetics.However,the effect of the concentration proportion of fine-grain sand and salt on the kinetics of secondary hydrate formation depended on the concentration.关键词
水合物/二次生成/粉砂砂粒/诱导时间/生成动力学Key words
gas hydrate/reformation/fine-grain sand/induction time/formation kinetics分类
能源科技引用本文复制引用
李清平,黄婷,史博会,庞维新,陈玉川,宫敬..含粉砂及盐体系甲烷水合物二次生成规律[J].化工进展,2023,42(12):6251-6258,8.基金项目
国家自然科学基金(U20B6005,U21B2065) （U20B6005,U21B2065）
国家重点研发计划(2022YFC2806200) （2022YFC2806200）
中国海洋石油有限公司"十四五"重大科技项目(KJGG2022-0205). （KJGG2022-0205）
