Structural Modelling

Abstract

A simplified model was developed to calculate the maximum tensile and compressive strains due to a uniform movement of a block of soil in a direction parallel to the pipe axis using a closed-form solution of the governing differential equations. The model employs the theory of plasticity for modelling the pipe material based on normality plastic flow rule, the von Mises yield criterion, and isotropic strain hardening. While the pipe was assumed to have a bilinear, stress-strain curve...

Abstract

The failure of a high-pressure natural gas pipeline can lead to various outcomes, some of which can pose a significant threat to people and property in the immediate vicinity of the failure location. The dominant hazard is thermal radiation from a sustained jet or trench fire. An estimate of the ground area affected by a credible worst-case failure event can be obtained from a model that characterizes the heat intensity associated with rupture failure of the pipe where the escaping...

Abstract

The present work describes a prediction method for the bottom slamming pressure on the keel level. The new procedure consists in using the ship’s Centre of Gravity Response Amplitude Operator results (CGRAO). This method analyzes the translational and rotational motion on a regular wave in order to find if there is an emergence of the ship forefoot. This method is based on a fine time steps and on a precise geometric calculation which yields to an exact calculation of the pressure at...

Abstract

Thermal well technologies, such as Cyclic Steam Stimulation (CSS) and Steam Assisted Gravity Drainage (SAGD), are widely used for the exploration of heavy oil and oilsands resources. Casing connections are one of the most critical components in thermal wells in terms of the wellbore structural and pressure integrities. High temperature operation of thermal wells inevitably imposes significant axial loads on the casing connections, and as a result, a plastic strain design concept must be...

Abstract

Considering the future development for offshore pipelines, moving towards difficult operating condition and deep/ultra-deep water applications there is a need to understand the failure mechanisms and better quantify the strength and deformation capacity of corroded pipelines considering the relevant failure modes (collapse, local buckling under internal and external pressure, fracture / plastic collapse etc.).
A Joint Industry Project sponsored by ENI E&P and Statoil has been launched...

Abstract

Structural analysis methods used in the design of buried pipelines for the discontinuous permafrost regions need to handle the unique conditions that can arise; in particular thaw subsidence and frost heave. As a chilled gas pipeline traverses from a frost stable soil zone to a frost susceptible zone, frost bulbs are formed around the pipe and cause the pipeline to heave. If there is significant differential heave, pipe bending across the interface between these two zones could result...

The Industry Challenge:

Commercial and defense aircraft manufacturers are incorporating advanced materials such as new alloys and composite materials into the structural components of new aircraft.

The crack propagation behavior in these materials, when subjected to cyclic loading, must be determined to develop fatigue life models and rigorous crack growth inspection programs.

How We Help:

C-FER conducted large panel tests in compliance with the manufacturer’s specifications. Both advanced alloy...

The Industry Challenge:

Manufacturers of remote operated vehicles are using lightweight and composite materials to build complex hull designs.

Naval designers are developing methods to restore aging submarines using reinforced, thin‑walled hull structures and weld buttering.

The collapse resistance of these designs must be validated with full-, or large-scale models to minimize effects related to scaling the manufacturing processes.

How We Help:

C-FER uses the Deepwater Experimental Chamber (DEC...

The Industry Challenge:

Steam Assisted Gravity Drainage (SAGD) requires complex well designs and completion configurations to ensure that steam can be delivered efficiently throughout the reservoir interval.

Conventional well completion approaches use multiple injection strings in “toe and heel” configurations to provide multi-point steam injection along the horizontal section of the wellbore.

The flow dynamics of these multi-string completions are extremely complicated due to heat transfer...

The Industry Challenge:

Canada has demonstrated the ability to economically produce heavy oil using a non-thermal method referred to as Cold Heavy Oil Production with Sand (CHOPS).

Operators from around the world are interested in using CHOPS to develop their heavy oil reservoirs; however, they do not have sufficient expertise in this recovery technique to determine if it is feasible.

How We Help:

C-FER can review the reservoir characteristics of a heavy oil reservoir to determine if it is...