粉砂影响下的甲烷水合物相平衡和生成规律实验  

Experimental study on methane hydrate phase equilibrium and formation considering silt sand effect

作　　者：唐青隽 李国亮 胡广文 刘慧 付玮琪 TANG Qingjun;LI Guoliang;HU Guangwen;LIU Hui;FU Weiqi(CNPC XiBu Drilling Engineering Company Limited,Well Testing Company,Karamay,Xinjiang 834000,China;State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国石油集团西部钻探工程有限公司试油公司,新疆克拉玛依834000 [2]中国矿业大学煤炭精细勘探与智能开发全国重点实验室,江苏徐州221116

出　　处：《中国海上油气》2024年第6期100-107,共8页China Offshore Oil and Gas

基　　金：中国石油科技创新基金研究项目“海域水合物开采井排水管线内水合物堵塞形成机理(编号:2021DQ02—1005)”;江苏省自然科学基金青年基金项目“海域水合物储层长水平段钻井井筒内岩屑床形成机理(编号:BK20210507)”;中国博士后科学基金面上资助(编号:2023M743887);中央高校基本科研业务费(编号:2022ZZCX05K6);中国矿业大学煤炭资源与安全开采国家重点实验室自主研究课题(编号:SKLCRSM22X002)部分研究成果。

摘　　要：由于天然气水合物储层存在低温高压、出砂强度大、井底气液分离效率低等问题,天然气水合物开采井内流体实际为甲烷-水-粉砂三相流,并存在水合物堵塞风险。研发了适用于甲烷-水-粉砂三相条件下的甲烷水合物反应釜,并开展考虑粉砂影响的甲烷水合物相平衡和生成规律实验。实验结果表明:粉砂可以改善气液间传热和传质速率,在粉砂影响下甲烷水合物相平衡曲线将向右水平移动1.0~1.2℃;随着粉砂含量增加,水合物生成速率和水合物生成过程中水转化率均随之升高,因此粉砂会增加深水油气和天然气水合物开采管线内水合物堵塞风险。本研究成果可为制定高效的水合物流动保障方案提供理论基础。Natural gas hydrate reservoir faces problems such as low temperature and high pressure,high sand production strength,and low efficiency of gas-liquid separation at the bottom,and the fluid in the production well of natural gas hydrates is a methane gas-water-silt sand three-phase flow,with a hydrate blockage risk.Therefore,a methane hydrate reactor was designed suitable for the methane gas-water-silt sand three-phase flow condition,and an experimental study on methane hydrate phase equilibrium and formation was conducted by considering the silt sand effect.The experimental results show that the silt sand can promote heat and mass transfer between gas and liquid.Because of the effect of silt sand,the methane hydrate phase equilibrium curve turns right about 1.0-1.2℃.As the silt sand concentration increases,the hydrate formation rate and the water conversion rate during hydrate formation are increased as well.It shows that the silt sand increases the risk of hydrate blockage in the production line of deep water oil and gas hydrates,which lays a theoretical foundation for developing an efficient hydrate flow management plan.

关 键 词：甲烷水合物 粉砂 水合物堵塞 相平衡 

分 类 号：TE355[石油与天然气工程—油气田开发工程] P618.13[天文地球—矿床学]