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| Effect of hydrophilic nano-SiO2 on CH4 hydrate formation |
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SUN Huicui1, WANG Ren2,3, XU Xianguang2,3, WANG Jianhua2,3, JIANG Guosheng1, ZHANG Ling1, LIU Tianle1, NING Fulong1
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(1.Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China;2.Engineering Technology Research ＆ Development Company Limited, CNPC, Beijing 102206, China;3.National Engineering Laboratory for Oil ＆ Gas Drilling Technology, Beijing 102206, China)
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| Abstract: |
| Addition of nanoparticles into drilling fluids can maintain the wellbore stability and decrease the invasion of drilling fluid into near wellbore formation when drilling hydrate bearing sediments, which may also affect the formation of gas hydrates in the wellbore. In this study, laboratory experiments were carried out to investigate the effect of nanoparticles on methane hydrate formation, and the induction time, the amount and rate of hydrate formation at an experimental condition of 5℃ and 5 MPa) using pure water and various drilling fluid formulation were measured, including distilled water added with hydrophilic nano-SiO2 particles (30 nm and 50 nm of particle sizes) with concentrations of 1%-5%. The results show that nano-SiO2 particles can efficiently inhibit the formation of methane hydrate. In comparison with pure water, addition of nanoparticles (50 nm and 4%), the hydrate induction time can be increased by 74%, with the amount of hydrate formed reduced by 21%, and the rate of formation reduced by 56%. |
| Key words: CH4 hydrate hydrate drilling fluid hydrophilic nano-SiO2 hydrate inhibition |
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