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Thermoreversible gels and temperature triggered kinetically controlled gels for oilfield applications.

机译：用于油田应用的热可逆凝胶和温度触发的动力学控制凝胶。

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摘要

Polymer gels have been extensively used in oil and gas wells. In this dissertation we explore the use of novel thermoreversible gels and temperature triggered kinetically controlled gels for application in water shutoff, gravel packing and fracturing. Thermoreversible gels consisting of block copolymer surfactants have the unique property of forming a gel between a certain temperature range. The range of gelation temperatures can be controlled by varying the surfactant concentration, molecular weight, hydrophobicity and functional groups. The gelation is reversible and both the lower and upper gelation temperatures are sharp phase transitions. Gelation and rheological properties of a range of Pluronic and Tetronic surfactants are investigated. Core flow experiments are conducted to show that gels can be used to reversibly reduce the permeability of cores. The gels will find likely applications in fracturing and gravel. packing.; Temperature triggered kinetically controlled gels have been synthesized primarily from crosslinked functionalized PEGs and Pluronics. The gelation times and gel properties can be varied based on the molecular weight, functional groups, and degree of crosslinking of gels synthesized. Gelation kinetics are controlled by monomer concentration, monomer type, initiator concentration, initiator type, pH and temperature. Some gels formed are found to be hard and swell in the presence of water to several times their weights as well as being stable for extended period of time. Such gels will find applications in water shutoff treatments. Other gel systems have been formulated to degrade rapidly with time. The swelling and degelation of such gels have been investigated in detail.; It is found that the use of crosslinked PEGs and Pluronics provide a family of gels that will find likely application in water shutoff treatments. Thermoreversible gels such as those from Pluronics and Tetronics can find applications in fracturing and gravel packing applications. Core flow experiments performed to evaluate these gels at reservoir conditions indicate the suitability of these gel systems for these applications.
机译：聚合物凝胶已广泛用于油气井。本文探讨了新型热可逆凝胶和温度触发的动力学控制凝胶在堵水，砾石充填和压裂中的应用。由嵌段共聚物表面活性剂组成的热可逆凝胶具有在一定温度范围内形成凝胶的独特性能。胶凝温度的范围可以通过改变表面活性剂的浓度，分子量，疏水性和官能团来控制。胶凝是可逆的，并且上下胶凝温度都是急剧的相变。研究了一系列Pluronic和Tetronic表面活性剂的凝胶化和流变特性。进行岩心流动实验表明，凝胶可用于可逆地降低岩心的渗透性。凝胶将在压裂和砾石中找到可能的应用。填料。;温度触发的动力学控制凝胶主要由交联的官能化PEG和Pluronics合成。凝胶化时间和凝胶性质可以基于合成的凝胶的分子量，官能团和交联度而变化。胶凝动力学由单体浓度，单体类型，引发剂浓度，引发剂类型，pH和温度控制。发现形成的某些凝胶在水的存在下坚硬且膨胀至其重量的几倍，并且在长时间内稳定。这样的凝胶将在断水处理中找到应用。已经配制了其他凝胶体系以随时间迅速降解。已经详细研究了这种凝胶的溶胀和凝胶化。发现使用交联的PEG和Pluronics提供了一系列凝胶，这些凝胶将可能在断水处理中应用。诸如Pluronics和Tetronics的热可逆凝胶可用于压裂和砾石充填应用。在储层条件下进行的评估这些凝胶的岩心流动实验表明，这些凝胶体系对于这些应用的适用性。

著录项

  • 作者

    Nasakul, Siree.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Petroleum.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 188 p.
  • 总页数 188
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;
  • 关键词

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