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纯水体系下水合物的生成及堵塞实验研究
引用本文:李乐,朱倩谊,陈小康.纯水体系下水合物的生成及堵塞实验研究[J].西南石油大学学报(自然科学版),2019,41(4):152-158.
作者姓名:李乐  朱倩谊  陈小康
作者单位:1. 江苏城乡建设职业学院公用事业学院, 江苏 常州 213147;2. 常州大学石油工程学院, 江苏 常州 213147
基金项目:国家自然科学基金(51574045);中国石油科技创新基金(2016D-5007-0607);江苏省住建厅课题(2018ZD015)
摘    要:为了保障水合物浆液在管路中安全流动,开展了CO2水合物生成及堵塞实验,探究纯水体系下CO2水合物生成到堵塞管路的形态变化以及系统压力、泵速等因素对水合物浆液流动形态的影响。实验结果表明,(1)在纯水体系下,管道中水合物呈浆状和泥状两种形态,且CO2水合物从生成到堵塞管路时间较短。(2)实验过程中,临界泵速为35 Hz;当泵速大于35 Hz时,水合物在管输过程中不会发生堵塞现象;当泵速小于35 Hz时,在系统压力相同的条件下,随着泵速的增加,水合物发生堵塞的时间延长。(3)同一泵速条件下,随着系统压力升高,水合物发生堵塞时间缩短;且系统压力为3.4 MPa时,水合物发生堵塞的时间为2 100 s;系统压力为2.4 MPa时,水合物发生堵塞的时间为6 225 s。

关 键 词:CO2水合物  生成  堵塞  泵速  压力  
收稿时间:2018-09-15

An Experimental Study on Hydrate Formation and Blockage in a Pure Water System
LI Le,ZHU Qianyi,CHEN Xiaokang.An Experimental Study on Hydrate Formation and Blockage in a Pure Water System[J].Journal of Southwest Petroleum University(Seience & Technology Edition),2019,41(4):152-158.
Authors:LI Le  ZHU Qianyi  CHEN Xiaokang
Institution:1. Utilities Department, Jiangsu Urban and Rural Construction Vocational College, Changzhou, Jiangsu 213147, China;2. Petroleum Engineering Institute, Changzhou University, Changzhou, Jiangsu 213147, China
Abstract:To ensure the safety of hydrate slurry flow in pipelines, an experiment on CO2 hydrate synthesis and blockage was performed to investigate the morphological changes to CO2 hydrates from the point of synthesis to pipeline blockage in a pure water system as well as the influences of system pressure and pump speed on the flow patterns of the hydrate slurry. The experimental results of this study are as follows:(1) In a pure water system, hydrates exist in the form of slurries or slush within pipelines, and the time interval between CO2 hydrate synthesis and pipeline blockage is relatively short. (2) The critical pump speed during the experiment is 35 Hz. When the pump speed exceeds 35 Hz, the hydrates do not result in blockage during pipeline transportation; when the pump speed is below 35 Hz, an increase in pump speed delays the occurrence of hydrate blockage under conditions of identical system pressure. (3) Under conditions of identical pump speed, an increase in system pressure shortens the time interval between hydrate synthesis and blockage. At system pressures of 3.4 MPa and 2.4 MPa, hydrate blockages respectively occur at 2 100 s and 6 225 s after hydrate synthesis.
Keywords:CO2 hydrates  synthesis  blockage  pump speed  pressure  
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