Synthesis of tertiary amine-terminated environment-friendly hyperbranched polyamine intercalation inhibitor and water-based drilling fluid

Abstract

The invention discloses synthesis of a tertiary amine-terminated environment-friendly hyperbranched polyamine intercalation inhibitor and a water-based drilling fluid. The tertiary amine-terminated environment-friendly hyperbranched polyamine intercalation inhibitor is prepared by mixing environment-friendly polytertiary amine and water, wherein the mass ratio of the environment-friendly polyamine in the drilling fluid is 0.5%-5%. The synthesis raw materials of the tertiary amine-terminated environment-friendly hyperbranched polyamine are an ester substance containing a polyethylenic bond, an amino acid substance containing primary amine and secondary amine and an alcohol substance with low molecular weight, and an end-capping reagent is 1-methyl-2-propylene-1-amino methanol or 1-ethyl-2-propylene-1-amino methanol. The drilling fluid comprises the environment-friendly hyperbranched polyamine terminated by the tertiary amine provided by the invention. The drilling fluid can effectively inhibit shale hydration expansion. The shale intercalation inhibitor prepared from the tertiary amine-terminated environment-friendly hyperbranched polyamine provided by the invention is non-toxic and harmless, and the inhibition performance of the shale intercalation inhibitor is obviously improved compared with that of similar intercalation inhibitors.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to the synthesis of a tertiary amine-terminated environment-friendly hyperbranched polyamine intercalation inhibitor and a water-based drilling fluid containing the inhibitor. Background technique [0002] Borehole instability is one of the problems that seriously affects the efficiency of oil and gas drilling and production. The direct or indirect economic losses caused by the shrinking, expanding, sticking and even well collapse accidents caused by the instability of the wellbore are up to billions of dollars every year. At present, 75% of the drilling or drilled formations are shale formations, and 90% of the wellbore instability problems occur in shale formations. This is due to the strong water sensitivity of shale. When the shale formation encounters water, serious hydration will occur, resulting in hydration expansion and dispersion of shale, resulting in r...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the wellbore instability problem caused by conventional inhibitors being unable to effectively inhibit shale hydration expansion, the present invention provides a synthesis method of an environmentally friendly hyperbranched polyamine intercalation inhibitor terminated by a tertiary amine, which can effectively inhibit shale The problem of hydration expansion of rock strata can be solved, so as to achieve the purpose of stabilizing the borehole wall

Images