«Oilfield engineering»

The Well Force ZERS 3.0 Program. Accounting for random deviations and buckling. Part 3/3

UDC: 622.245:519.677:531
DOI: -

Authors:

¹ Scientific and Technical Center "ZERS", Moscow, Russia

Keywords: well, probabilistic analysis, strength, buckling, hydraulic fracturing, initial curvature, heterogeneity and asymmetry of the structure

Annotation:

In [1], a new approach to modeling the movement of pipes in a well is presented, taking into account their imperfections and the main effects that occur during buckling (bend of pipes under the action of longitudinal compressive forces). In [2], the effectiveness of this approach and the correctness of its implementation in the Well Force ZERS 3.0 program are demonstrated by comparing with the results of finite element calculations of compression of a pipe having its own curvature and located inside another rigid pipe (a demo version of the program is available at: https://programs.werymag.ru/Programs). In this paper, the influence of factors that are taken into account in the new calculation model on the results of calculations of forces and deformations in pipes is analyzed by modeling the movement of pipes in the well in a probabilistic formulation. Special attention is paid to the calculation of longitudinal deformations of pipes during hydraulic fracturing, where longitudinal compressive forces can reach large values, at which the difference between the new calculation model and traditional approaches becomes significant. It is shown that in a compressed pipe column, their own curvature can significantly increase the contact forces between the pipes and the well.

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