Finite Element Analysis of the Collapse and Post-Collapse by Eduardo N Dvorkin, Rita G. Toscano

By Eduardo N Dvorkin, Rita G. Toscano

This booklet provides an in depth dialogue of the versions that have been built to simulate the cave in and post-collapse habit of metal pipes.

The finite aspect approach bargains to engineers the potential for constructing types to simulate the cave in habit of casings inside of oil wells and the cave in habit of deepwater pipelines. besides the fact that, if technological judgements are going to be reached from those version effects, with implications for the industrial luck of commercial operations, for the occupational security and healthiness and for the surroundings, the engineering versions must be hugely trustworthy. utilizing those types engineers can quantify the impression of producing tolerances, put on, corrosion, and so forth. This ebook describes in nice info the experimental courses which are built to validate the numerical effects.

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The baseline finite element result presents an excellent agreement with the experimental result. 4 % between the finite element predicted and the experimentally determined collapse pressures can be attributed to the nonhomogeneous yield stress and to the indetermination in the value of the axial residual stresses, as can be seen in Fig. 6. In Fig. 7 we compare the experimentally and numerically determined (External Pressure vs. Internal Volume Reduction) diagrams. In this figure we also compare the deformed meshes corresponding to the post-collapse regime with the collapsed pipe profile.

4 Application: Validation for Slotted Pipes Steam Assisted Gravity Drainage (SAGD) is an oil recovery technology for producing heavy crude oil using slotted pipes. A pair of horizontal wells is drilled into the oil reservoir separated by a vertical distance of a few meters. Steam is injected into the upper well to heat the oil; then the oil, with its viscosity reduced, is collected for the lower wellbore through a slotted liner. A 3D finite element model was developed to assess the influence of the slots on the structural resistance of the pipes.

2 Validation of the Finite Element Model In order to validate the finite element model, in the present section we analyze a series of cases presented by Kyriakides in [21]. Even though the pipes analyzed by Kyriakides are of smaller outer diameter and different material characteristics (aluminum) than the pipes that we analyze with our model, the mechanism of the collapse behavior is identical; hence, after the validation of the model, we use it on typical steel seamless pipes. Fig. 8 Infinite tube.

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