A Study on Anti-collapse Mechanism and Synthesis of Hyperbranched Polymer HP-NH2

doi:10.11885/j.issn.16745086.2021.04.30.01

Abstract

Abstract: Wellbore stability is the current technical difficulty in drilling deep shale gas with water-based drilling fluids. Using diethylenetriamine and N, N-methylenebisacrylamide as raw materials, the hyperbranched polymer HP-NH₂ was synthesized by Michael addition reaction. The structure and characteristics of the hyperbranched polymer HP-NH₂ were characterized by infrared spectroscopy, liquid chromatography-mass spectrometry, gel chromatography, particle size analysis and thermal weight loss analysis. The study found that the number average molecular weight of the hyperbranched polymer HP-NH₂ was 3 371 g/mol, the particle size was in the range of 280～1 900 nm, and the temperature resistance reached 280℃. Through the artificial mud cake method, linear expansion experiment, recovery rate experiment and mud cake dispersion experiment, the anti-collapse performance of hyperbranched polymer HP-NH₂ as an anti-collapse agent was analyzed. We found that with the increase of HP-NH₂, the linear expansion rate of bentonite gradually decreased (the lowest was 19.11%), the rolling recovery rate of cuttings gradually increased (the highest was 75.18%), and the permeability of the artificial mud cake gradually declined. Hyperbranched polymer HP-NH₂ can be inserted between the crystal layers of montmorillonite to exchange cations that are easily hydrated between the layers, tighten the substrate spacing, and inhibit the hydration and dispersion of montmorillonite; HP-NH₂ can also effectively block mud cake's micro-nano pores. Therefore, the hyperbranched polymer HP-NH₂ can be used as a potential anti-collapse agent in water-based drilling fluid systems.

Key words: anti-collapse agent, hyperbranched polymer, inhibition performance, blocking performance, anti-collapse mechanism

CLC Number:

TE254

WEI Yunjin, HUANG Xuegang, ZOU Yuanhong, XU Weining, XIE Gang. A Study on Anti-collapse Mechanism and Synthesis of Hyperbranched Polymer HP-NH₂[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 99-108.

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A Study on Anti-collapse Mechanism and Synthesis of Hyperbranched Polymer HP-NH₂

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