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Casing Collapse Analysis in Kupal Field

Haghshenas Lari, Sajjad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50465 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Shad, Said; Jamshidi, Said
  7. Abstract:
  8. Casing collapse is a long-standing problem in Kopal oil field, located at a distance of 60 km of east of Ahwaz, Iran. In this field, so far casing collapse has encountered in 18 well-bore out of the 56 drilled-well-bore (~32%) due to creep loading caused by salt flow, which resulted in tremendous economic loss. Among all the different set of factors leading to such a problem, the effects of the local stress distribution on the wellbore wall and casing (resulted from the in-situ stresses, and stress perturbation due to drilling), pore pressure, the casing quality and material, and the applied-cement type are important. In order to investigate these factors and their effects, they should be classified as near well-bore factors, and far-filed factors. In most of the empirical equations developed to assist with the casing design, the impact of cementing between casing and formation is ignored. The results of the field investigations, however, revealed that the cementing could significantly affect and control the near-well-bore stresses that formation applies on the casing. The impacts of the inclination between the drilled-well-bore and the formation, and resulted local stress distribution are not studied properly. The results of numerical simulation in this study showed that the angle between the well-bore and the local in-situ stress direction strongly influence the applied-stress distribution on the casing and displacement magnitude, while the effect of eccentricity of the casing inside the cement and Cement temperature, are negligible as long as the cementing bondage is strong enough
  9. Keywords:
  10. Cements ; Stress ; Pipe Casing ; Simulation ; Rheology ; Simuatuin Phenomenon

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