A Stiff-String Model for Torque and Drag Analysis in Directional Wells

Mayouf, Mansour; Hadjadj, Ahmed

doi:10.1007/s13369-022-06881-8

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Mitchell et al [13] proposed a rigid rod model by considering the contact position between the string and borehole. Mayouf et al [14] proposed a method for calculating the large deformation and torque of a string based on the beam theory. Wang et al [15] established a stress analysis model of the test string of HTHPs in gas wells.…”

Section: Introductionmentioning

confidence: 99%

Study of the Failure Mechanism of an Integrated Injection-Production String in Thermal Recovery Wells for Heavy Oil

et al. 2023

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The integrated injection-production string is the core tool used in thermal recovery wells for heavy oil, the mechanical behavior of which is complex due to the coupling effect of downhole temperature and pressure and the load induced by steam huff and puff operations. In this paper, an analysis model that calculates the temperature and pressure field during steam huff and puff operations has been established based on the basic principles of energy conservation and heat transfer. Then, the force distribution and strength check of the integrated injection-production string were analyzed. The fatigue damage of the string was evaluated by considering dynamic loads during the injection process. The corrosion life of the string was predicted. Finally, the failure mechanism of the integrated injection-production string in thermal recovery wells for heavy oil was illustrated. The results showed that the strength of the string and vibration fatigue are not the main causes of failure, but corrosion is the main reason for string failure. The residual strength of the corroded string was greatly reduced, which is the fundamental reason for the failure of the string. This paper is of guiding significance to the optimization of design and safety evaluations of the integrated injection-production string in thermal recovery wells for heavy oil.

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Section: Introductionmentioning

confidence: 99%