Scale effect in modeling of mechanical processes in the vicinity of a borhole on a true Triaxial Loading setup

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Рұқсат ақылы немесе тек жазылушылар үшін

Аннотация

One of the main problems when conducting laboratory tests of rock specimens aimed at determining their mechanical and strength properties is to transfer the test results of relatively small specimens to sufficiently large areas of a rock massif, often with a complex structure. This is due to the fact that generalized numerical indicators characterizing the degree of influence of structural heterogeneities of various sizes on the deformation and destruction of rocks and massifs are not yet available. In addition to heterogeneity, other factors also affect the processes under study, such as the stress state of the massif, the presence of geological disturbances, macrofractures, etc. These issues are studied in this paper based on a comparison of the results of experiments performed on the Triaxial Independent Loading Test System of the Institute of Problems in Vechanics of the Russian Academy of Sciences using the “hollow cylinder” scheme on specimens with a central hole of 10 and 20 mm in diameter and physical modeling of deformation processes in the vicinity of wells with a decrease in pressure at their bottomhole for reservoir rocks of the Prirazlomnoye oil field.

Толық мәтін

Рұқсат жабық

Авторлар туралы

V. Karev

Ishlinsky Institute for Problems in Mechanics RAS

Email: perfolinkgeo@yandex.ru
Ресей, Moscow

Yu. Kovalenko

Ishlinsky Institute for Problems in Mechanics RAS

Хат алмасуға жауапты Автор.
Email: perfolinkgeo@yandex.ru
Ресей, Moscow

Әдебиет тізімі

  1. Koyfman M.I., Protodyakonov M.M., Teder R.I. Mechanical Properties of Rocks. Moscow: Publishing House of the Academy of Sciences of the USSR, 1963, p. 169. [in Russian].
  2. Koyfman M.I. About the influence of dimensions on the strength of rocks / Research of physical and mechanical properties of rocks in relation to the tasks of mountain pressure control. M.: Izd. of the USSR Academy of Sciences, 1962. P. 6–14. [in Russian].
  3. Ermolovich E.A., Ovchinnikov A.V., Anikeev A.A., Haustov V.V. Influence of the specimen size on the strength of chalk// Proceedings of Tula State University. Earth Sciences. 2020. № 2. P. 263–271. [in Russian].
  4. Komurlu E. Loading rate conditions and specimen size effect on strength and deformability of rock materials under uniaxial compression // Geo-Engineering. 2018. V. 9. № 17. P. 1–11. https://doi.org/10.1186/s40703-018-0085-z
  5. Kun Du, Xuefeng Li, Rui Su, Ming Tao, Shizhan Lv, Jia Luo, Jian Zhou. Shape ratio effects on the mechanical characteristics of rectangular prism rocks and isolated pillars under uniaxial compression // International Journal of Mining Science and Technology. 2022. V. 32. P. 347–362. https://doi.org/10.1016/j.ijmst.2022.01.004
  6. Usoltseva O.M., Tsoi P.A., Semyonov V.N. Influence of specimen size on deformation and strength properties of rocks // Fundamental and Applied Issues of Mining Sciences. 2020. V. 7. № 2. P. 53–59. https://doi.org/10.15372/FPVGN2020070209 [in Russian].
  7. Durmeková T., Bednarik M., Dikejová P., Adamcova R. Influence of specimen size and shape on the uniaxial compressive strength values of selected Western Carpathians rocks // Environmental Earth Sciences. 2022. V. 81. № 9. https://doi.org/10.1007/s12665-022-10373-1.17
  8. Suknev S.V. Fracture of a brittle geomaterial with a circular hole under biaxial loading // PMTF. 2015. V. 56. № 6. P. 166–172. [in Russian].
  9. Suknev S.V. Application of Finite Crack Mechanics Approach for Fracture Assessment of Quasi-brittle Material with a Circular Hole // Izv. RAS. MTT. 2021. № 3. P. 13–25. [in Russian].
  10. Karev V., Kovalenko Yu. Triaxial loading system as a tool for solving geotechnical problems of oil and gas production // True Triaxial Testing of Rocks. Leiden: Taylor & Francis / Balkema. 2013. P. 301–310.
  11. Kovalenko Yu.F., Ustinov K.B., Karev V.I. Geomechanical analysis of formation of breakouts in well walls // Izv. RAS. MTT. 2022. № 6. P. 148–163. [in Russian].
  12. Ustinov K.B., Karev V.I., Kovalenko Yu.F., Barkov S.O., Khimulya V.V., Shevtsov N.I. Experimental study of the effect of anisotropy on the orientation of breakouts in wells // Izv. RAS. МТТ. 2023. № 3. P. 21–35. [in Russian].
  13. Timoshenko S.P., Goodyear J. Theory of Elasticity. Moscow: Nauka, 1979. 560 p. [in Russian].
  14. Karev V., Kovalenko Y., Ustinov K. Geomechanics of Oil and Gas Wells. Springer. 2020. 184 p. https://doi.org/10.1007/978-3-030-26608-0

Қосымша файлдар

Қосымша файлдар
Әрекет
1. JATS XML
Жүктеу
2. Fig. 1. Schematic representation of the loading unit of the ISTNN installation for testing using the “hollow cylinder” scheme: 1 – sample

Жүктеу (117KB)
Метадеректер
3. Fig. 2. Loading program for a sample with a 10 mm hole: S – sample compression stress, MPa; t – time, s

Жүктеу (70KB)
Метадеректер
4. Fig. 3. Deformation curves of a sample with a 10 mm hole: S – sample compression stress, MPa; Ei – deformations along three axes of the sample

Жүктеу (85KB)
Метадеректер
5. Fig. 4. Sample with a hole after testing

Жүктеу (82KB)
Метадеректер
6. Fig. 5. Loading program for a sample with a 20 mm hole: S – sample compression stress, MPa; t – time, s

Жүктеу (58KB)
Метадеректер
7. Fig. 6. Deformation curves of a sample with a 20 mm hole: S – sample compression stress, MPa; Ei – deformations along three axes of the sample

Жүктеу (74KB)
Метадеректер
8. Fig. 7. Sample loading program P 10-4: Si – stresses applied to the sample faces, MPa; t – time, s

Жүктеу (83KB)
Метадеректер
9. Fig. 8. Deformation curves of sample P 10-4 during the experiment: S2 – loading parameter, MPa; Ei – deformations along three axes of the sample

Жүктеу (83KB)
Метадеректер

© Russian Academy of Sciences, 2024