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Bottomhole assembly collapse model



Kulchitskiy V.V., Naseri Yasin. (Gubkin State Oil and Gas University, RF, Moscow)

E-mail: centrdipo@gubkin.ru

Presently, design estimates for bottomhole assemblies increasingly rely on numerical modelling methods. Using computer- aided and numerical tools, especially a finite element method, it is believed feasible to address complex systems such as BHAs, providing reasonable accuracy. Greatest metal fatigue zone location and assessment are central issues for such models. This paper provides summary for a BHA failure model based on an actual well incident. Under drilling, with progression to rock cutting tools, a drill pipe appears increasingly affected by alternating stress and torque. In the addressed case, the greatest metal fatigue zone coincided with actual failure location thereby proving adequacy of this methodology targeting better reliability of each BHA element.

References

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 2. Naseri Yasin. Modelirovaniye razrusheniya konstruktsii perelivnogo klapana na primere skvazhiny Alkinskogo mestorozhdeniya [Simulation of structural failure of the overflow valve on the example of the well of the Alkinskoe field]. Tezisy dokladov Odinnadtsatoi Vserossiiskoi konferentsii molodykh uchenykh, spetsialistov i studentov Novye tekhnologii v gazovoi promyshlennosti. 2023 oktyabrya 2015 [Abstracts of papers of the Eleventh All-Russian Conference of Young Researchers, Specialists and Students New technologies in the gas industry. 2023 October 2015]. Moscow, PAO Gazprom Gubkin RGUNG Publ., 2015, p.128.
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 4. Kulchitskiy V.V., Naseri Yasin, Yakunin S.A., et al. Optimizatsiya stroitelstva gorizontalnykh skvazhin na bazhenovskuyu svitu [Optimization of horizontal wells construction on the Bazhenov suite]. Inzhener-neftyanik, 2015, no. 4, pp. 912.
 5. Saroyan A.E., Shcherbyuk N.D., Yakubovskiy N.V., et al. Truby neftyanogo sortamenta: spravochnik. 3-e izd. [Oil country tubular: directory. 3rd ed.]. Moscow, Nedra Publ., 1987. 488 p.



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