Modified hydroxyethyl cellulose tackifier for well drilling and preparation method thereof

Abstract

The invention discloses modified hydroxyethyl cellulose tackifier for well drilling and a preparation method thereof. The tackifier is prepared by performing graft copolymerization modification on hydroxyethyl cellulose and sodium p-styrene sulfonate. A preparation process is as follows: (1), hydroxyethyl cellulose and sodium p-styrene sulfonate are dissolved with deionized water respectively and mixed, a mixed solution is obtained, and an initiating agent is added; (2), the mixed solution is heated to 40 DEG C-60 DEG C to have a polymerization reaction for 6-8 hours in the nitrogen environment, and a graft copolymerization product solution of hydroxyethyl cellulose and sodium p-styrene sulfonate is obtained; (3), the graft copolymerization product solution is extracted with acetone or absolute ethyl alcohol, dried and ground into powder, and then modified hydroxyethyl cellulose tackifier for well drilling is obtained. The tackifier can effectively improve the viscosity of a working fluid for well drilling, improve the flowing state of the fluid and improve the comprehensive performance of slurry and can be compatible with various additives; the principle of the preparation method is reliable, the operation is easy and convenient, raw materials are easy to obtain and low in price, and environment protection is facilitated.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a modified hydroxyethyl cellulose thickener for well drilling and a preparation method thereof. Background technique [0002] In drilling engineering, in order to ensure that various working fluids such as drilling fluid and spacer fluid have high viscosity and good rheology, it is usually necessary to add an appropriate amount of viscosifier. Water-soluble polymer viscosifiers, through the bridging, adsorption, and entanglement between molecular chains or between molecular chains and other particles, can increase the viscosity of the working fluid system and improve the flow state of the slurry. Therefore, the use of viscosifiers is beneficial to the stability of well walls and the safety of construction operations. Common tackifier materials include the following categories: cellulose, biological glue (such as guar gum, xanthan gum, etc.), and synthetic acrylamide polym...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a modified hydroxyethyl cellulose viscosifier for drilling. Within a reasonable dosage range, the viscosifier can effectively increase the viscosity of the drilling fluid, improve the flow state of the fluid, and increase the viscosity of the drilling fluid. The comprehensive performance of the slurry overcomes the defects of ordinary tackifiers such as the breakage of the molecular chain structure at high temperature and the loss of the thickening effect, poor salt resistance, etc., and makes up for the technical gap

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