Role of PVA Flakes in Promoting Self-Degradation of Sodium Metasilicate-Activated Cement under a Hydrothermal Environment at 150°C

Authors

  • T. Sugama Brookhaven National Laboratory, Sustainable Energy Technologies, Building 526, 12 N. Sixth St., Upton, NY 11973, USA
  • T. Pyatina Brookhaven National Laboratory, Sustainable Energy Technologies, Building 526, 12 N. Sixth St., Upton, NY 11973, USA
  • A. Muraca Department of Chemistry, SUNY Stony Brook, Stony Brook, NY 11794, USA

DOI:

https://doi.org/10.6000/1929-6002.2013.02.04.6

Keywords:

Enhanced Geothermal System, polyvinyl alcohol, cement, sodium metasilicate, lost circulation, temporary sealer

Abstract

We investigated the effect of flakes of polyvinyl alcohol (PVA) on the self-degradation of sodium metasilicate (SMS)-activated slag/Class C fly ash cement, which is used as temporary sealer for fractures in Enhanced Geothermal System (EGS) wells under a hydrothermal environment at ³150°C and at pressure of 1000 psi. The reactions between PVA and SMS dissolved in an aqueous medium at 85°C led to the formation of a colloidal hydroxylated silicate-cross-linked PVA gel in the cement body. This gel-incorporated cement had a compressive strength >2000 psi, so ensuring that it adequately plugs the fractures. Increasing the hydrothermal temperature to ³150°C triggered the transformation of the gel into a sol. This in-situ gel®sol phase transition played a pivotal role in promoting the cement’s self-degradation because of the extensive spreading of sol in the cement body, and its leaching from the cement. In contrast, when gel was dry heated at ³150°C, the gel®xerogel phase transformation engendered the molecular fragmentation of PVA. This fragmentation yielded polysilicate cross-linked PVA derived from the combination of extended-chain scission, carboxylation and condensation, so that it no longer served as a self-degrading promoter of cement.

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Published

2013-11-28

How to Cite

Sugama, T., Pyatina, T., & Muraca, A. (2013). Role of PVA Flakes in Promoting Self-Degradation of Sodium Metasilicate-Activated Cement under a Hydrothermal Environment at 150°C. Journal of Technology Innovations in Renewable Energy, 2(4), 352–365. https://doi.org/10.6000/1929-6002.2013.02.04.6

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