An excess Gibbs free energy model is applied to in®estigate the influence of n-paraffin composition on the aging beha®ior of wax-oil gel deposits known to form in subsea petroleum transport pipelines. The aging of wax-oil gels occurs by a counterdiffusion process where wax molecules with carbon numbers greater than a critical carbon num( ) ber CCN diffuse into the gel matrix, and ®ice ®ersa. Mo...

This article uses an active control dedicated to the positioning of subsea structures like flow lines. This kind of operation consists in connecting the bottom end of a very long pipeline to the wellhead, by dynamically modifying the pipeline top end position, which is linked to a Dynamically Positioned Vessel (DPV). Such long pipelines are usually called risers, because they are used to rise t...

For operators of oil and gas to save the cost unforeseen events risks, avoid unnecessary shutdowns, there is a need have an effective subsea pipeline integrity management system. Currently large number pipelines around globe already exceeded their design lives; nevertheless, they are still being operated safely, effectively with diligent consideration towards Environmental, Health Safety regula...

Oil and gas exploration is a sector which drives the global economy currently contributes significantly to economic development. The safety of subsea pipelines deeply affected by factors such as pipeline buckling, corrosion leakage. Once seriously leaking or damaged, it will cause lot waste resources at light level, explosions in severe cases, resulting heavy casualties huge losses, same time, ...

Abstract This research examines the factors contributing to exterior material degradation of subsea oil and gas pipelines monitored with autonomous underwater systems (AUS). The AUS have a role gathering image data that is further analyzed artificial intelligence analysis methods. Corrosion potential ruptures on pipeline surfaces are complex processes involving several competing elements, such ...

An innovative logic tree, Failure Expansion Tree (FET), is proposed in this paper, which improves on traditional Fault Tree Analysis (FTA). It describes a different thinking approach for risk factor identification and reliability risk assessment. By providing a more comprehensive and objective methodology, the rather subjective nature of FTA node discovery is significantly reduced and the resul...