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

T. Sugama; T. Pyatina; A. Muraca

doi:10.6000/1929-6002.2013.02.04.6

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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