Preparation method of polyamide inhibitor for drilling fluid

Abstract

The invention discloses a preparation method of a polyamide inhibitor for drilling fluid. The preparation method comprises the following steps: (a) dissolving a substance A in an alcohol solvent, andadding a substance B into the alcohol solution of the substance A, wherein the mass ratio of A to B is (1 to 1.5): 1, the reaction temperature is 45-70 DEG C, and the reaction time is 12-24h, so as toobtain an intermediate product; (b) adding a substance C and a catalyst into the intermediate product, wherein the mass ratio of C to A is (0.5 to 1.2): 1, and the dosage of the catalyst accounts for1% of the substance A; heating to a reflux temperature, and reacting for 4-12h at the reflux temperature; (c) distiling out the solvent alcohol to obtain a product. The polyamide inhibitor prepared by the invention has the characteristics of remarkable high-temperature resisting and inhibiting effect, and little impact on rheological property and the like, and is suitable for different water-based drilling fluid systems. The polyamide inhibitor can prevent the problem of borehole instability caused by hydration dispersion and expansion of clay minerals on water-sensitive formation, and also can effectively stabilize the rheological property of the drilling fluid system so as to avoid failure in performance control.

Description

technical field [0001] The invention relates to the technical field of inhibitors for drilling fluids, in particular to a preparation method of polyamide inhibitors for drilling fluids. Background technique [0002] When water-sensitive formations such as mudstone and shale are drilled with water-based drilling fluids, formation minerals are prone to hydration, expansion and dispersion, resulting in problems such as wellbore instability and difficulty in controlling the rheology of drilling fluids. Therefore, from the perspective of drilling fluid, the inhibition of drilling fluid system becomes the key to drilling water-sensitive formations. Inhibition of the drilling fluid system has become an important factor for safe drilling on site. [0003] At present, the main inhibitors are inorganic potassium salts, organic potassium salts, quaternary ammonium salts, organic amines and amine (ammonium) polymerization. Although these inhibitors have a certain inhibitory effect, th...

AI Technical Summary

Problems solved by technology

[0005] However, due to the limited adsorption capacity of the conventional inhibitors represented by the above-mentioned patent documents, desorption often occurs at high temperatures, resulting in the loss of inhibition at high temperatures.

Images