A New Drilling Fluid for Drilling in Marine Gas Hydrate Bearing Sediments
Liu Tianle
Li Lixia
Jiang Guosheng
Wang Ren
Sun Jiaxin
Peng Li
Chixotkin Victor
Abstract：With increasing global concern of nature gas hydrate exploration and development,more and more attention has been paid to drilling technology in gas hydrate bearing sediment (GHBS).However,the dissociation and reformation of gas hydrates in borehole will affect the stability of wellbore during drilling.Based on the drilling characteristics in hydrate formation,exist-ing nano-materials,and a large number of experiments,a kind of new nano-SiO2 drilling fluid for drilling in GHBS is intro-duced:seawater+2% nano-SiO2 +3% bentonite+1%Na-CMC+3%SMP-2 +1%PVP(K90)+2%KCl,subsequently low-temperature traditional performance and hydrate formation inhibition of the drilling fluid were evaluated.Experimental results show that the drilling fluid is featured with optimum density,good low-temperature rheology and shale hydration inhibition, and it can effectively inhibit free gas from hydrate dissociation near borehole reformat hydrate in drilling fluid circulation system for a long time.Therefore,the drilling fluid is beneficial to keep borehole safety and to ensure successful drilling operation while drilling in GHBS.
Keywords：natural gas hydrate bearing sedimentdrilling fluidnano-SiO2kinetic inhibitorlow-temperature performancegeoloogical engineering
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 1913-1921 )