skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Insights into the physical and chemical properties of a cement-polymer composite developed for geothermal wellbore applications

Abstract

To isolate injection and production zones from overlying formations and aquifers during geothermal operations, cement is placed in the annulus between well casing and formations. Wellbore cement can fracture due to chemical and physical stress. A polymer-cement (composite) with self-healing properties, stable at high temperatures, was recently developed by our group. Here we present data on the elemental distribution, mineral composition, internal microstructure, and tensile elasticity of this composite and how it compares to cement without polymer (control cement). Entrapped air porosity was similar between control cement (0.44% by volume) and composite (0.22% by volume). Total voids increased with polymer content in the cement (10% and 25% composite), and polymer was found to fill most of these voids. Polymer appears to act as a (cement hydration) retarder increasing the amount of unhydrated silicate minerals in the matrix. Tensile elasticity was improved for composites as compared to control cement, suggesting that the composite materials perform better under mechanical stress. Density-functional calculations reproduce the drop in Young’s modulus by about 60% observed experimentally when polymer is added to the cement. In addition, calculations indicate that the bonding interactions between the cement and polymer remain stable over the range of strain studied.

Authors:
ORCiD logo; ; ; ; ; ORCiD logo; ; ; ; ; ; ; ; ORCiD logo; ORCiD logo; ; ; ORCiD logo
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1503167
Report Number(s):
PNNL-SA-131466
Journal ID: ISSN 0958-9465
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Composites
Additional Journal Information:
Journal Volume: 97; Journal Issue: C; Journal ID: ISSN 0958-9465
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Rod, Kenton A., Nguyen, Manh-Thuong, Elbakhshwan, Mohamed, Gills, Simerjeet, Kutchko, Barbara, Varga, Tamas, Mckinney, Adriana M., Roosendaal, Timothy J., Childers, M. Ian, Zhao, Chonghang, Chen-Wiegart, Yu-chen Karen, Thieme, Juergen, Koech, Phillip K., Um, Wooyong, Chun, Jaehun, Rousseau, Roger, Glezakou, Vassiliki-Alexandra, and Fernandez, Carlos A. Insights into the physical and chemical properties of a cement-polymer composite developed for geothermal wellbore applications. United States: N. p., 2019. Web. doi:10.1016/j.cemconcomp.2018.12.022.
Rod, Kenton A., Nguyen, Manh-Thuong, Elbakhshwan, Mohamed, Gills, Simerjeet, Kutchko, Barbara, Varga, Tamas, Mckinney, Adriana M., Roosendaal, Timothy J., Childers, M. Ian, Zhao, Chonghang, Chen-Wiegart, Yu-chen Karen, Thieme, Juergen, Koech, Phillip K., Um, Wooyong, Chun, Jaehun, Rousseau, Roger, Glezakou, Vassiliki-Alexandra, & Fernandez, Carlos A. Insights into the physical and chemical properties of a cement-polymer composite developed for geothermal wellbore applications. United States. doi:10.1016/j.cemconcomp.2018.12.022.
Rod, Kenton A., Nguyen, Manh-Thuong, Elbakhshwan, Mohamed, Gills, Simerjeet, Kutchko, Barbara, Varga, Tamas, Mckinney, Adriana M., Roosendaal, Timothy J., Childers, M. Ian, Zhao, Chonghang, Chen-Wiegart, Yu-chen Karen, Thieme, Juergen, Koech, Phillip K., Um, Wooyong, Chun, Jaehun, Rousseau, Roger, Glezakou, Vassiliki-Alexandra, and Fernandez, Carlos A. Fri . "Insights into the physical and chemical properties of a cement-polymer composite developed for geothermal wellbore applications". United States. doi:10.1016/j.cemconcomp.2018.12.022.
@article{osti_1503167,
title = {Insights into the physical and chemical properties of a cement-polymer composite developed for geothermal wellbore applications},
author = {Rod, Kenton A. and Nguyen, Manh-Thuong and Elbakhshwan, Mohamed and Gills, Simerjeet and Kutchko, Barbara and Varga, Tamas and Mckinney, Adriana M. and Roosendaal, Timothy J. and Childers, M. Ian and Zhao, Chonghang and Chen-Wiegart, Yu-chen Karen and Thieme, Juergen and Koech, Phillip K. and Um, Wooyong and Chun, Jaehun and Rousseau, Roger and Glezakou, Vassiliki-Alexandra and Fernandez, Carlos A.},
abstractNote = {To isolate injection and production zones from overlying formations and aquifers during geothermal operations, cement is placed in the annulus between well casing and formations. Wellbore cement can fracture due to chemical and physical stress. A polymer-cement (composite) with self-healing properties, stable at high temperatures, was recently developed by our group. Here we present data on the elemental distribution, mineral composition, internal microstructure, and tensile elasticity of this composite and how it compares to cement without polymer (control cement). Entrapped air porosity was similar between control cement (0.44% by volume) and composite (0.22% by volume). Total voids increased with polymer content in the cement (10% and 25% composite), and polymer was found to fill most of these voids. Polymer appears to act as a (cement hydration) retarder increasing the amount of unhydrated silicate minerals in the matrix. Tensile elasticity was improved for composites as compared to control cement, suggesting that the composite materials perform better under mechanical stress. Density-functional calculations reproduce the drop in Young’s modulus by about 60% observed experimentally when polymer is added to the cement. In addition, calculations indicate that the bonding interactions between the cement and polymer remain stable over the range of strain studied.},
doi = {10.1016/j.cemconcomp.2018.12.022},
journal = {Cement and Concrete Composites},
issn = {0958-9465},
number = C,
volume = 97,
place = {United States},
year = {2019},
month = {3}
}