Shale inhibitor for drilling fluid and preparation method of shale inhibitor

Abstract

The invention relates to a shale inhibitor for a drilling fluid and a preparation method of the shale inhibitor. The method comprises the following steps: putting an initiator into a reactor; dropwise adding a catalyst to the reactor under atmospheric pressure and nitrogen protection, and carrying out sulfonated esterification reaction at 0-30 DEG C for 10-12 hours; filtering a reactant, and dissolving a filtrate into water; taking lower liquid after standing and phase separating, and carrying out reduced pressure distillation to remove water, so as to obtain a sulphur ester compound; dropwise adding the sulphur ester compound into a reaction kettle containing an aminating agent, and carrying out amination at 70-90 DEG C for 2-3 hours; and filtering a product, and carrying out reduced pressure distillation to remove a solvent, so as to obtain the shale inhibitor. The additive is suitable for a plurality of water-based drilling fluids; hydration dispersion of shale can be well controlled; the problems such as thickening and performance deterioration of the drilling fluid caused by hydration dispersion of the shale are effectively reduced; and a certain guarantee is provided for safe and efficient drilling.

Description

technical field [0001] The invention relates to a method for synthesizing an inhibitor for drilling fluid, which is suitable for water-based drilling fluid and can effectively prevent the hydration and dispersion of clay minerals during the drilling process—mud shale inhibitor. Background technique [0002] The hydration and dispersion of clay minerals in shale during the drilling process is the main reason for borehole diameter shrinkage and borehole wall collapse. At the same time, the dispersion of cuttings causes excessive clay content in drilling fluid and an increase in submicron particles, resulting in increased drilling fluid. Thickness and performance deterioration can easily lead to downhole complex accidents such as resistance during tripping and drill sticking, which greatly increases the cost and difficulty of drilling operations. Therefore, high-efficiency inhibitors for drilling fluids have been a research hotspot in recent years, and various shale inhibitors ...

AI Technical Summary

Problems solved by technology

However, when these shale inhibitors encounter mud shale with high water sensitivity, strong dispersion, and high montmorillonite content, they still cannot well inhibit the hydration expansion of mud shale, and even some treatment agents cannot reach the reservoir. Conservation and Environmental Protection Requirements

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