Preparation and Performance Evaluation of High Temperature Degradable Pullulan Microsphere Hydrogel Plugging Agent

doi:10.11885/j.issn.1674-5086.2025.01.11.02

Abstract

Abstract: Wellbore instability poses a significant challenge encountered during drilling operations, impacting the efficiency of drilling processes, escalating operational expenses, and jeopardizing drilling safety. Nanomaterials play a pivotal role in sealing microcracks within the formation and stabilizing the wellbore. In this investigation, a pullulan microsphere (PM) was produced through reverse microemulsion polymerization. Subsequently, N, N-dimethylacrylamide (DMAA), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and dimethyldiallylammonium chloride (DMDAAC) were grafted onto PM to create a pullulan microsphere plugging agent (PM-DAD). Experimental findings demonstrate that PM-DAD disintegrates into nanoparticles of varying sizes under different high temperatures, effectively sealing microcracks of diverse dimensions. PM-DAD exhibits remarkable efficacy in reducing filtration losses, with the filtration loss of freshwater-based slurry measuring 4.7 mL after aging at 200 ℃, while maintaining a salt resistance of 15%. Notably, PM-DAD demonstrates prolonged and efficient plugging capabilities, reducing the artificial mud cake permeability by 65.2% and limiting sand bed invasion depth by 9.2 cm after being subjected to 200 ℃ aging. The mechanism elucidates that PM-DAD accomplishes nanopore sealing through a synergistic approach involving pore penetration and rock surface adsorption, highlighting its potential application in shale gas extraction.

Key words: Pullulan microspheres, inverse microemulsion, high temperature degradation, plugging agent

CLC Number:

TE254.6

LUO Pingya, DAI Feng, XIANG Xinrong, LIN Zhengwen, LIU Yingmin, BAI Yang. Preparation and Performance Evaluation of High Temperature Degradable Pullulan Microsphere Hydrogel Plugging Agent[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(5): 1-12.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2025.01.11.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2025/V47/I5/1

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