Method for preparation of biomimetic polymer for stabilizing wellbore and drilling fluid
First Claim
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1. A method for preparation of a polymer containing constitutional units represented by formula III, comprising:
- (1) reacting polymer containing constitutional units represented by formula III with an unsaturated carboxylic acid represented by general formula R4CH═
CHCOOH in a graft copolymerization reaction;
(2) condensing the polymer obtained in (1) with dopamine and/or dopamine hydrochloride;
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Abstract
The present invention provides a biomimetic polymer for stabilizing wellbore, a method for preparation of the biomimetic polymer, and a drilling fluid. The polymer contains carboxymethyl chitosan that serves as a backbone and dopamine-derived groups grafted on the backbone. The polymer provided in the present invention can improve the strength of shale in the wellbore, seal the shale pores and reduce the filter loss of drilling fluid, and thereby attains an effect of stabilizing the wellbore in shale formation in drilling process.
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7 Claims
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1. A method for preparation of a polymer containing constitutional units represented by formula III, comprising:
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(1) reacting polymer containing constitutional units represented by formula III with an unsaturated carboxylic acid represented by general formula R4CH═
CHCOOH in a graft copolymerization reaction;(2) condensing the polymer obtained in (1) with dopamine and/or dopamine hydrochloride; - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification