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Mechanical behaviour of wellbore materials saturated in brine water with different salinity levels

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  • Nasvi, M.C.M.
  • Ranjith, P.G.
  • Sanjayan, J.
  • Haque, A.
  • Li, Xiao

Abstract

In any carbon capture and sequestration (CCS) project, well cement plays a vital role as it provides the required zonal isolation and well integrity. Typical wellbore materials including well cement and formation rock will be exposed to a range of saturation mediums such as water and brine with different salinity levels. To date, ordinary Portland cement (OPC)-based well cement has been used. However, its survival has been questioned under CO2 sequestration conditions, as it experiences cement degradation and strength reduction in saline water. Therefore, this experimental work investigates the mechanical characteristics of geopolymer (G) as well cement and sandstone (S) as formation material. The mechanical behaviours of G, S and G–S composite materials in fresh water (W) and two concentrations of brine water (BW), 5% NaCl (5% BW) and 15% NaCl (15% BW), were studied. Based on the results, it was found that G, S and G–S samples experience strength reduction in W and BW. However, the reduction rate of G is almost half of that of OPC-based oil well cement. In addition, the strength reduction rates of G and G–S were less in 15% BW compared to W and 5% BW, due to the lower alkali leaching rates from G in BW compared to W. Therefore, saline aquifers with high NaCl content are always favourable for G well cement. The S samples showed constant strength reduction regardless of the saturation medium, and hence NaCl does not show any significant effect on the mechanical behaviour of quartz-rich sandstone. The crack propagation stress thresholds were higher for G and G–S saturated in 15% BW compared to 5% BW. The S samples did not show major variation in crack propagation stress thresholds in W and BW. The ARAMIS strain measurement results showed that the maximum strain that wellbore materials experience at failure reduces with the introduction of brine. In addition, G and G–S undergo splitting failure, whereas S experiences shear failure in W and BW.

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  • Nasvi, M.C.M. & Ranjith, P.G. & Sanjayan, J. & Haque, A. & Li, Xiao, 2014. "Mechanical behaviour of wellbore materials saturated in brine water with different salinity levels," Energy, Elsevier, vol. 66(C), pages 239-249.
    • Handle: RePEc:eee:energy:v:66:y:2014:i:c:p:239-249
    DOI: 10.1016/j.energy.2013.12.003
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    References listed on IDEAS

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    1. Perera, M.S.A. & Ranjith, P.G. & Choi, S.K. & Airey, D., 2011. "The effects of sub-critical and super-critical carbon dioxide adsorption-induced coal matrix swelling on the permeability of naturally fractured black coal," Energy, Elsevier, vol. 36(11), pages 6442-6450.
    2. Nasvi, M.C.M. & Ranjith, P.G. & Sanjayan, J. & Haque, A., 2013. "Sub- and super-critical carbon dioxide permeability of wellbore materials under geological sequestration conditions: An experimental study," Energy, Elsevier, vol. 54(C), pages 231-239.
    3. Mohamed M.C. Nasvi & Ranjith P. Gamage & Sanjayan Jay, 2012. "Geopolymer as well cement and the variation of its mechanical behavior with curing temperature," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 2(1), pages 46-58, February.
    4. Perera, M.S.A. & Ranjith, P.G. & Peter, M., 2011. "Effects of saturation medium and pressure on strength parameters of Latrobe Valley brown coal: Carbon dioxide, water and nitrogen saturations," Energy, Elsevier, vol. 36(12), pages 6941-6947.
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    2. Yan-Hua Huang & Sheng-Qi Yang & Matthew R. Hall & Yuan-Chao Zhang, 2018. "The Effects of NaCl Concentration and Confining Pressure on Mechanical and Acoustic Behaviors of Brine-Saturated Sandstone," Energies, MDPI, vol. 11(2), pages 1-17, February.
    3. Yang, Xianyu & Cai, Jihua & Jiang, Guosheng & Zhang, Yungen & Shi, Yanping & Chen, Shuya & Yue, Ye & Wei, Zhaohui & Yin, Dezhan & Li, Hua, 2022. "Modeling of nanoparticle fluid microscopic plugging effect on horizontal and vertical wellbore of shale gas," Energy, Elsevier, vol. 239(PB).
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    5. Yang, Xianyu & Cai, Jihua & Jiang, Guosheng & Xie, Jingyu & Shi, Yanping & Chen, Shuya & Yue, Ye & Yu, Lang & He, Yichao & Xie, Kunzhi, 2020. "Nanoparticle plugging prediction of shale pores: A numerical and experimental study," Energy, Elsevier, vol. 208(C).

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