Aminoalkyl glucoside graft copolymer and preparation method thereof, and drilling fluid

Abstract

The invention provides a preparation method for an aminoalkyl glucoside graft copolymer. The preparation method comprises the following steps: (1) subjecting alkyl glucoside, epoxide, chloride and anacidic catalyst to a reaction so as to obtain a first intermediate; (2) reacting the first intermediate with alicyclic amine so as to obtain a second intermediate; and (3) under the action of an initiator, subjecting the second intermediate, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid to a reaction so as to obtain the aminoalkyl glucoside graft copolymer. With the method provided by the invention, the aminoalkyl glucoside graft copolymer with a specific structure is prepared and has good inhibition performance, lubrication performance, filtrate loss reducing performance, and resistance to contamination by saturated salts and composite salts. Moreover, the aminoalkyl glucoside graft copolymer is free of biological toxicity. The invention also provides the aminoalkyl glucoside graft copolymer and a drilling fluid.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to an amino alkyl glycoside graft copolymer, a preparation method thereof and a drilling fluid. Background technique [0002] In recent years, with the increasing number of deep wells, ultra-deep wells, highly deviated wells, and horizontal wells in the field of oil drilling, deep and ultra-deep wells in deep wells and ultra-deep wells with high formation temperature are prone to collapse The problem of wellbore instability during drilling cannot be solved well. Using oil-based drilling fluid can solve the problem of wellbore instability to a certain extent, but oil-based drilling fluid has the problems of high preparation cost and poor environmental performance. Usually, strong amine-based inhibitors are used as the core main agent of drilling fluid, and other treatment agents are used together to prepare water-based drilling fluid with better inhibitory performance. This water-b...

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Problems solved by technology

[0002] In recent years, with the increasing number of deep wells, ultra-deep wells, highly deviated wells, and horizontal wells in the field of oil drilling, deep and ultra-deep wells in deep wells and ultra-deep wells with high formation temperature are prone to collapse The problem of wellbore instability during drilling cannot be well solved

The use of oil-based drilling fluid can solve the problem of wellbore instability to a certain extent, but oil-based drilling fluid has the problems of high preparation cost and poor environmental performance

Usually, strong amine-based inhibitors are used as the core main agent of drilling fluid, and other treatment agents are used together to prepare water-based drilling fluid with better inhibitory performance. This water-based drilling fluid has the performance of oil-based drilling fluid, but the amine-based The poor compatibility of inhibitors and other treatment agents makes it difficult to control the stability of water-based drilling fluids, which limits their promotion and application

[0003] In terms of modification of strong amine-based inhibitors, an alkyl glycoside oil-based drilling fluid was proposed abroad in the 1990s. This oil-based drilling fluid has good environmental performance, but due to the inhibitory properties of alkyl glycosides and The high temperature resistance is poor, and it needs to add more than 35% in the drilling fluid to fully exert its inhibitory performance, which increases the production cost of the drilling fluid

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