Strong inhibitor organic salt for drilling fluid, and drilling fluid

Abstract

The invention discloses strong inhibitor organic salt for drilling fluid, and the drilling fluid, and belongs to the related technical field of the drilling fluid. The main raw material components of the strong inhibitor organic salt for the drilling fluid comprise oxalic acid, alkyl betaine and ethylated bistrimethyl ammonium chloride, preferably, water is included. In addition, the invention also provides the drilling fluid containing the organic salt. In the organic salt system, cation is a quaternary ammonium ion, anion is an organic carboxylic acid ion containing an organic amine cation group, the inhibition effect of the organic salt is more excellent than that of inorganic salt potassium chloride, and the pH value is more than or equal to 6 when the concentration is 5.0 percent by weight; in the solution of 30 percent by weight, the recovery rate of rock debris is more than or equal to 70 percent; the Cl<-> content is less than or equal to 1 percent and the performance is excellent; the chloridion is not contained, environmental pollution is avoided, the preparation method is simple, the condition is mild, the production cost is low and a wide application prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a clean and pollution-free organic salt with strong inhibitors for multi-group drilling fluids and the drilling fluid. Background technique [0002] Most of the drilling fluids used in petroleum drilling are water-based drilling fluids with aqueous solution as the continuous phase. When water contacts formation rocks, long-term soaking will cause shale hydration and expansion. The expansion and dispersion of mudstone on the wellbore wall will lead to expansion of the wellbore wall, necking of the borehole, spalling of the wellbore wall and other phenomena, resulting in complex situations and accidents such as hanging and sticking of the drilling tool during the drilling operation. The dispersion and expansion of mudstone cuttings in the drilling fluid will greatly increase the viscosity and shear force of the drilling fluid, making it difficult for the drilling fluid to f...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high content of potassium chloride in existing drilling fluid inhibitors, difficult control of drilling fluid rheology at high temperature, high filtration loss, and environmental pollution due to chloride ion toxicity, the present invention provides a clean, environmentally friendly, and highly inhibitory inhibitor. , Simple and easy-to-use organic salt with strong inhibitor for drilling fluid

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