Mining of Mineral Deposits

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Investigation of the elastic properties of cement stone as a factor in ensuring well annular sealing integrity

Mykola Seniushkovych1, Volodymyr Tyrlych1, Oleh Martsynkiv1, Ivan Vytvytskyi1, Ivan Dudych1, Bohdan Martsynkiv1, Ivan Vytvytskyi (Jr.)1

1Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine


Min. miner. depos. 2026, 20(3): 97-107


https://doi.org/10.33271/mining20.03.097

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      ABSTRACT

      Purpose. To establish the relationships between the elastic-strength and deformation properties of cement stone and its formation conditions, which determine the integrity and sealing capacity of the cement sheath in oil and gas wells.

      Methods. The research methodology is based on a comprehensive, structured interpretation of experimental datasets cha-racterizing the formation of cement stone produced from the base PCT I-100 Portland well cement. The relationships between the elastic and mechanical properties of the cement stone were evaluated using correlation analysis. Regression analysis incorporating the full set of available explanatory variables was used to develop mathematical models describing changes in cement stone properties under different formation conditions.

      Findings. Young’s modulus, strength, and deformation characteristics of cement stone depend substantially on curing age and temperature. A high curing temperature (75°C) accelerates the early development of elastic and strength properties and reduces creep deformation, but it does not yield the highest long-term strength. At 20°C, curing proceeds more slowly; however, at later stages, it results in greater stiffness and a more sustained increase in strength. Creep and residual deformation decrease with age, although their values are considerably higher at lower temperatures, thereby increasing the risk of defects in the wellbore casing system.

      Originality. The importance of determining the elastic properties of cement stone, a key factor in the formation of leakage microchannels in wellbore casing systems, has been demonstrated. It was established that cement stone produced from the base PCT I-100 Portland well cement exhibits insufficient elastic properties at early curing stages, which may result in loss of contact with the casing string and surrounding rock under operational loading. Mathematical regression models were developed to assess the potential risk of leakage pathway formation during the early stages of cement stone curing by integrating the relationships between its mechanical properties and formation conditions.

      Practical implications. The identified patterns in the deformation characteristics of cement stone can be useful for research institutions and industrial enterprises developing cement slurry formulations for well cementing.

      Keywords: well; cementing; portland cement; cement stone; tightness


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