井筒条件下疏水纳米SiO_(2)对水合物形成的影响  

Effect of hydrophobic nano-SiO_(2) on hydrate formation in wellbore

作　　者：方翔宇 宁伏龙[1,2] 欧文佳 郭东东 张凌[1] 王林杰 FANG Xiangyu;NING Fulong;OU Wenjia;GUO Dongdong;ZHANG Ling;WANG Linjie(Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;National Center for International Research on Deep Earth Drilling and Resource Development, China University of Geosciences, Wuhan 430074, China;Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou 510760, China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]科技部地球深部钻探与深地资源开发国际联合研究中心,武汉430074 [3]国土资源部海底矿产资源重点实验室,广州510760

出　　处：《中国科技论文》2021年第4期370-376,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(41672367);国家重点研发计划项目(2017YFC0307600);国土资源部海底矿产资源重点实验室资助项目(KLMMR-2017-B-07)。

摘　　要：为研究钻井液中纳米颗粒的负面影响,利用井筒水合物动态形成模拟系统,研究了井筒内甲烷气向上运移过程中,不同粒径及不同质量分数疏水纳米SiO_(2)对水合物形成的影响规律。实验结果表明:粒径30 nm与50 nm的疏水纳米SiO_(2)在质量分数为0.1%~2.5%范围内对水合物形成有促进作用;随着疏水纳米SiO_(2)质量分数的增加,诱导时间缩短,气体平均消耗速率总体呈增大趋势;相同质量分数下,粒径为50 nm比粒径为30 nm的疏水纳米SiO_(2)促进作用更为显著。疏水纳米SiO_(2)对水合物形成的促进作用可能是由于其疏水特性,以及增加了溶液的传热传质作用引起。上述结果表明疏水纳米颗粒并不适用于水合物钻井液体系,未来可以考虑加入亲水纳米颗粒,发挥纳米SiO_(2)优势的同时降低水合物聚集风险。Effect of different particle sizes and mass fraction of hydrophobic nano-SiO_(2)on the hydrate formation during upward migration of methane gas were studied by using dynamic hydrate formation simulation system in borehole.The results show that the addition of hydrophobic nano-SiO_(2)with mass fraction of 0.1%~2.5%and particle sizes of 30 and 50 nm can promote the hydrate formation.Both the induction time and the average gas consumption rate increased with the increase of nanoparticle mass fraction.The promoting effect of hydrophobic nano-SiO_(2)with a particle size of 50 nm is more significant than that of 30 nm under a certain mass fraction.This may be due to the hydrophobic properties of nanoparticles and the increase of heat and mass transfer of solution by adding hydrophobic nano-SiO_(2).The results indicate that hydrophobic nano-SiO_(2)is not suitable for hydrate drilling fluid system.In the future,it can be considered to add hydrophilic nanoparticles to play the advantages of nano-SiO_(2)and reduce the risk of hydrate aggregation.

关 键 词：天然气水合物 钻井液 疏水纳米SiO_(2) 

分 类 号：TE358[石油与天然气工程—油气田开发工程]