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Carbon dioxide thickening agents for reduced carbon dioxide mobility.

机译:二氧化碳增稠剂可降低二氧化碳的流动性。

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摘要

The objective of this work is to design, synthesize, and evaluate direct carbon dioxide thickeners. The thickener must dissolve in CO2 without the introduction of a cosolvent. The thickener, in dilute solution of less than one weight percent, should be capable of at least doubling the viscosity of dense CO2 at temperature and pressure conditions characteristic of CO2 FOR floods.;A bulk-polymerized, random copolymer of fluoroacrylate (71mol%) and styrene (29mol%), Mn = 540,000, has been identified as an efficient CO2 thickener using falling cylinder viscometry and flow-through-porous-media viscometry. For example, a 0.5wt% solute of the random copolymer in CO 2 tripled the viscosity of liquid CO2 flowing through a 100md sandstone core at superficial velocities of 1∼10ft/day.;Non-fluorous polymers are also investigated in an attempt to identify a less expensive, more environmentally benign thickener. Our first step is to identify a highly CO2-philic, hydrocarbor-based polymer. Among all commodity polymers, poly vinyl acetate, PVAc, is identified as the most CO2 soluble, non-fluorous, hydrocarbon-based commercial available polymer. Nonetheless, PVAc does not exhibit sufficient solubility in CO 2 at reservoir conditions to form the basis of a class of CO2 thickeners.
机译:这项工作的目的是设计,合成和评估直接二氧化碳增稠剂。增稠剂必须在不引入助溶剂的情况下溶于CO2。增稠剂在稀溶液中的含量小于1%(重量),应至少能够使稠密的CO2在CO2 FOR驱油特性的温度和压力条件下的粘度增加一倍。本体聚合的氟代丙烯酸酯无规共聚物(71mol%)苯乙烯(29摩尔%),Mn = 540,000,已使用落瓶式粘度计和流通孔介质粘度计被确定为一种有效的CO2增稠剂。例如,CO 2中0.5wt%的无规共聚物溶质以1〜10ft / day的表观速度将流过100md砂岩岩心的液态CO2的粘度增加了三倍;还对非氟聚合物进行了研究,以鉴定较便宜,对环境更有益的增稠剂。我们的第一步是确定高度二氧化碳亲和的,基于烃的聚合物。在所有商品聚合物中,聚乙酸乙烯酯PVAc被确定为最易溶于二氧化碳的,无氟,基于烃的商品聚合物。然而,PVAc在储层条件下没有表现出足够的在CO 2中的溶解度以形成一类CO 2增稠剂的基础。

著录项

  • 作者

    Xu, Jianhang.;

  • 作者单位

    University of Pittsburgh.;

  • 授予单位 University of Pittsburgh.;
  • 学科 Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 136 p.
  • 总页数 136
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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