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Laboratory studies of creep behavior on thick-walled hollow cylindrical salt rock specimens

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Abstract

Salt domes are considered as one of the most important oil traps. Drilling in salt regions is associated with many problems. Challenging problems in drilling include trapping of the drill pipe string and reducing diameter of the wellbore. Convergence of wellbore’s wall in rock salts is mainly attributable to creep phenomenon. Tests on thick-walled hollow cylinder are one relative easy, economical, and realistic means to better understand the behavior of underground openings. In this research, hollow cylinder was used for modeling wellbore. Triaxial creep tests on thick-walled hollow cylindrical rock salt specimens were conducted. The effect of confining pressure, deviator stress, and strain rate on creep behavior of rock salt was studied. The results revealed that strain rate increases by increasing the deviatoric stress and confining pressure. The importance of lateral pressure was more of deviatoric stress in variations tangential strain rate. Furthermore, a mathematical equation was developed to estimate the strain rate in various stress fields. The experimental data of this research is served in another ongoing research for modeling, using a numerical modeling technique.

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Acknowledgments

This research was conducted in cooperation with the National Company of South-rich areas. The authors are thankful for this cooperation.

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Authors and Affiliations

  1. School of Mining Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran

    S. Rahimi & M. Hosseini

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  1. S. Rahimi
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  2. M. Hosseini
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Correspondence to M. Hosseini.

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Rahimi, S., Hosseini, M. Laboratory studies of creep behavior on thick-walled hollow cylindrical salt rock specimens. Arab J Geosci 8, 5949–5957 (2015). https://doi.org/10.1007/s12517-014-1622-5

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  • DOI: https://doi.org/10.1007/s12517-014-1622-5

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