Research on the polyolcol drilling fluids for offshore hydrate drilling

To aim at the unique characteristics of submarine gas hydrates formation, taking full account of existing commonly used polyglycol drilling fluid system, this essay presents a detailed exposition of the laboratory study of drilling in submarine gas hydrates formation with polyglycol drilling fluid which contains kinetic inhibitors. It turned out that the system has an excellent inhibition of shale and hydrate, favorable low-temperature rheology, stability, and lubricity, and it has the capability to effectively maintain borehole stability. Hence for these reasons, it is a drilling fluid system that is very suitable for undersea drilling in gas hydrate formation.