Early-age shrinkage of alkali-activated Class F fly ash and portland cement for long-term oil well zonal isolation control
| dc.contributor.advisor | Juenger, Maria C. G. | |
| dc.contributor.advisor | Oort, Eric van | |
| dc.contributor.committeeMember | Panchmatia, Parth | |
| dc.creator | Olvera, Raul | |
| dc.date.accessioned | 2019-11-06T19:58:12Z | |
| dc.date.available | 2019-11-06T19:58:12Z | |
| dc.date.created | 2019-05 | |
| dc.date.issued | 2019-05 | |
| dc.date.submitted | May 2019 | |
| dc.date.updated | 2019-11-06T19:58:14Z | |
| dc.description.abstract | Volumetric changes due to shrinkage occur during the hydration/polymerization process of ordinary portland cement (OPC) and alkali-activated Class F fly ash systems. If not accounted for in the design of structures, especially those at elevated temperature and pressure conditions, shrinkage can develop internal stresses, which could generate micro-cracking. Specifically in oil and gas wells, shrinkage can compromise the hydraulic annular and result in loss of zonal isolation. This thesis compares the early-age shrinkage behavior of Class H OPC, sodium hydroxide-activated Class F fly ash (geopolymer), and geopolymer-hybrid (geopolymers incorporating drilling mud) slurries with up to 20% (by volume) synthetic based mud (SBM) contamination cured at different temperatures and pressure conditions. A study into the effectiveness of zinc- and aluminum-based expansive agents for shrinkage mitigation is also presented. Shrinkage was recorded for specimens cured at temperatures between 23 - 80°C and up to 2000 psi confining pressure. The results from testing indicate that A) temperature plays a major role in the shrinkage development of OPC and geopolymer slurries; B) pressure significantly increases OPC slurry shrinkage, but only minimally for geopolymers; C) addition of SBM increases shrinkage for OPC and geopolymer slurries; D) expansive agents can potentially counteract shrinkage in both OPC and geopolymer slurries. In addition, issues with shrinkage measurement at elevated temperature and pressure with current ASTM and API shrinkage tests are presented, along with a novel shrinkage measurement method avoiding these issues. | |
| dc.description.department | Civil, Architectural, and Environmental Engineering | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | https://hdl.handle.net/2152/78308 | |
| dc.identifier.uri | http://dx.doi.org/10.26153/tsw/5397 | |
| dc.language.iso | en | |
| dc.subject | Geopolymers | |
| dc.subject | Cement | |
| dc.subject | Alkali-activated materials | |
| dc.subject | Zonal isolation | |
| dc.title | Early-age shrinkage of alkali-activated Class F fly ash and portland cement for long-term oil well zonal isolation control | |
| dc.type | Thesis | |
| dc.type.material | text | |
| thesis.degree.department | Civil, Architectural, and Environmental Engineering | |
| thesis.degree.discipline | Civil Engineering | |
| thesis.degree.grantor | The University of Texas at Austin | |
| thesis.degree.level | Masters | |
| thesis.degree.name | Master of Science in Engineering |
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