Drilling fluid inhibitor and preparation method thereof

Abstract

The invention relates to drilling fluid inhibitor and a preparation method thereof and belongs to the technical field of treating agents for oilfield chemical drilling fluids. The preparation method includes the steps of firstly, allowing epichlorohydrin, water and catalyst to react at 60-100 DEG C for 3-8 hours according to a mole ratio of 1:(12-20):(0.02-0.12) so as to obtain 3-chloro-1, 2-propanediol solution; secondly, allowing alkyl glycoside and the 3-chloro-1, 2-propanediol to react at 80-110 DEG C for 0.5-4.0 hours according to a mole ratio of 1:(0.5-5) so as to obtain chlorohydrin glucoside solution; thirdly, adjusting pH of the chlorohydrin glucoside solution to 6-9, adding 33.3% dimethylamine solution according to a mole ratio of the chlorohydrin glucoside to the dimethylamine, 1:(0.2-2.2); and fourthly, adding crosslinking agent accounting for 2%-5% of the dimethylamine in effective content; and allowing for polymerization at 40-80 DEG C for 1-5 hours before concentration, drying and crushing to obtain the finished alkyl glucoside polyamide. Water is used as solvent in reaction. The preparation process is simple and environment-friendly, and the drilling fluid inhibitor is high in shale inhibition performance.

Description

technical field [0001] The invention relates to an inhibitor for drilling fluid and a preparation method thereof, in particular to an alkyl glycoside polyamine and a preparation method thereof, belonging to the technical field of oilfield chemical drilling fluid treatment agents. Background technique [0002] At present, the commonly used inhibitors in drilling fluids mainly include asphalt, inorganic salts, synthetic polymers, etc. These inhibitors all have some shortcomings, such as asphalt is not conducive to environmental protection; silicate will make the system rheological It is difficult to control; the alkyl glycosides developed in recent years have large dosage, high cost, and the inhibition performance needs to be improved, which cannot effectively solve the drilling problem of mud shale. Amine-based inhibitors have poor compatibility with other treatment agents, especially anionic drilling fluid treatment agents, which limits their application. SUMMARY OF THE IN...

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Problems solved by technology

[0002] At present, the inhibitors commonly used in drilling fluids mainly include asphalt, inorganic salts, synthetic polymers, etc. These inhibitors have some shortcomings, such as asphalt is not conducive to environmental protection; silicate will make the system rheological Difficult to control; the alkyl glycosides developed in recent years have a large amount of addition, high cost, and the inhibitory performance needs to be improved, which cannot effectively solve the drilling problem of shale

The poor compatibility of amine-based inhibitors with other treatment agents, especially anionic drilling fluid treatment agents, limits its application

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