Synthesis of hyperbranched polyquaternium amino acid intercalation inhibitor and water-based drilling fluid

Abstract

The invention discloses synthesis of a hyperbranched polyquaternium amino acid intercalation inhibitor and a water-based drilling fluid. The hyperbranched polyquaternary ammonium salt amino acid intercalation inhibitor is prepared by mixing hyperbranched polyquaternary ammonium salt amino acid and water, wherein the mass ratio of the hyperbranched polyquaternary ammonium salt amino acid in the drilling fluid is 0.5%-5%. Synthetic raw materials of the hyperbranched polyquaternary ammonium salt amino acid are carboxylic acid substances containing multiple amino groups and crotonic acid alkenyl ester substances, and an end capping reagent is one of allyltrimethylammonium and allyltriethylammonium. The drilling fluid comprises the hyperbranched polyquaternary ammonium salt amino acid provided by the invention. The drilling fluid can effectively inhibit shale hydration expansion. The shale intercalation inhibitor prepared from the hyperbranched polyquaternary ammonium salt amino acid provided by the invention is non-toxic and harmless and is easier to combine with a clay layer with negative electricity, 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 hyperbranched polyquaternary ammonium amino acid intercalation inhibitor and a water-based drilling fluid containing the inhibitor. Background technique [0002] Borehole wall instability is one of the problems that seriously affect the efficiency of oil and gas drilling and production. The direct or indirect economic losses caused by hole wall instability, diameter shrinkage, diameter expansion, pipe sticking and even well collapse accidents are as high as billions of dollars every year. At present, 75% of the drilled or drilled formations belong to shale formations, and 90% of wellbore instability problems occur in shale formations. This is due to the strong water sensitivity of shale. When the shale formation encounters water, it will produce severe hydration, resulting in hydration expansion and dispersion of shale, resulting in a decreas...

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 a hyperbranched polyquaternium amino acid intercalation inhibitor, which can effectively inhibit shale formation The problem of hydration expansion, so as to achieve the purpose of stabilizing the well wall

Images