Potential Impacts of Formation Waters on the Integrity of Class H Cement and Reservoir Rock in Carbon (Co-)Sequestration Settings

Simple item page
dc.contributor.advisorReed, Marken_US
dc.contributor.authorVerba, Circeen_US
dc.date.accessioned2013-10-03T23:34:47Z
dc.date.available2013-10-03T23:34:47Z
dc.date.issued2013-10-03
dc.description.abstractThe focus of this research is to characterize the risk of carbon sequestration under downhole conditions with regards to wellbore cement integrity. The primary research objective was to understand the geochemical interactions of simulated sequestration brines and wellbore cement. There are four key focuses of this study with regards to cement interaction: 1) Simulated brines saturated with Supercritical CO2 and CO2-O2; 2) Adjacent formation host rock under sequestration conditions; 3) Geochemical modeling using CHIM-XPT based on the experimental studies of points 1) and 2) above; 4) Geomechanical strength tests of CO2 exposed cements. First, the interaction of cement with supercritical CO2, CO2-saturated brines, and CO2-O2 mixtures at 50 °C, 85 °C, and 28.9 MPa was evaluated. Cement exposed to a lower salinity brine (1 M) had a larger alteration depth (1.25 mm) compared to cement exposed to a higher salinity brine (2.2 M) (0.836 mm). CO2-O2 exposed cements displayed alteration depths of 1.6 mm at 85 °C and 0.7 mm at 50 °C for 1 M. The cement exposed to the 2.17 M solution had an alteration extending 1.685 mm. The second focus studied the influence of adjacent formations and observed mineral trapping in the Grande Ronde Basalt-cement. Studies of Mt. Simon Sandstone-cement interaction provided evidence for high CO2 storage capacity. The third focus is geochemical modeling using CHIM-XPT. Pure CO2 saturated brines yielded a pH of 3.0 at 1 M and 3.85 at 2.17 M. The CO2-O2 gas run calculated a pH of 3.96 at 1 M and 3.85 at 2.17 M. The Pasco solution after exposure had a pH of 6.97 and an estimated dissolved 161 g of CO2 (g). The pH of the Illinois Basin brine and Mt. Simon sandstone [and cement paste] was 5.8 with an estimated 139 g of CO2 consumed. Lastly, geomechanical tests on CO2 exposed cements indicated that addition of oxygen or changes in temperature play a key role in compressive and tensile strength, decreasing strength by 20-35%. This research highlighted the importance of representing the in-situ wellbore environment when conducting laboratory experiments. This dissertation includes previously published and unpublished co-authored material.en_US
dc.identifier.urihttps://hdl.handle.net/1794/13291
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.rightsAll Rights Reserved.en_US
dc.subjectBasalten_US
dc.subjectCementen_US
dc.subjectCHIM-XPTen_US
dc.subjectCO2en_US
dc.subjectGeochemical modelingen_US
dc.subjectSequestrationen_US
dc.titlePotential Impacts of Formation Waters on the Integrity of Class H Cement and Reservoir Rock in Carbon (Co-)Sequestration Settingsen_US
dc.typeElectronic Thesis or Dissertationen_US
thesis.degree.disciplineDepartment of Geological Sciencesen_US
thesis.degree.grantorUniversity of Oregonen_US
thesis.degree.leveldoctoralen_US
thesis.degree.namePh.D.en_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Verba_oregon_0171A_10722.pdf
Size:
20.37 MB
Format:
Adobe Portable Document Format
Download

Collections

Theses and Dissertations
Geological Sciences Theses and Dissertations