西南石油大学学报（自然科学版）2025，Vol.47Issue(5)：1-12,12.DOI:10.11885/j.issn.1674-5086.2025.01.11.02
钻井液用普鲁兰多糖微球封堵剂合成及性能评价
Preparation and Performance Evaluation of High Temperature Degradable Pullulan Microsphere Hydrogel Plugging Agent
摘要
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-acry-lamido-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 measur-ing 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.关键词
普鲁兰多糖微球/反相乳液/高温降解/封堵剂Key words
Pullulan microspheres/inverse microemulsion/high temperature degradation/plugging agent分类
石油、天然气工程引用本文复制引用
罗平亚,代锋,向欣荣,林郑文,刘应民,白杨..钻井液用普鲁兰多糖微球封堵剂合成及性能评价[J].西南石油大学学报（自然科学版）,2025,47(5):1-12,12.基金项目
国家自然科学基金(52274008,U23A2026) （52274008,U23A2026）
国家重点研发计划(2019YFA0708303) （2019YFA0708303）
中国石油-西南石油大学创新联合体科技合作项目(2020CX040102,2020CX040201) （2020CX040102,2020CX040201）
