Publications Internationales

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Author: search.filters.author.Bettayeb, MouradHas files: No

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    Using a supperficially treated 2024 aluminum alloy drill pipe to delay failure during dynamic loading
    (Elsevier, 2019) Belkacem, Lallia; Abdelbaki, Noureddine; Otegui, Jose Luis; Gaceb, Mohamed; Bettayeb, Mourad
    For many years, a critical factor while drilling deep wells in Algeria oil fields has been the fatigue loads in drill strings used in high tortuosity sections. One solution is the use of drill pipes made of alternative lighter materials instead of conventional steel. A thorough study of superficially (ST) treated 2024 aluminum alloy joined to steel drill pipes in crooked well trajectories is presented in this article. This work discusses several limiting loads exerted on the drill pipes that affect the drilling operation such as axial, twisting and bending forces, which lead to combined cyclic loads. This study is aimed to determine whether it is possible to extend the drilling operation by joining ST 2024 aluminum alloy drill pipes into the drilling string, without losing drilling stability or reliability. It is established that the ST 2024 aluminum alloy drill pipe exerts significant influence on the allowable combined load, but affects to a larger extent the critical load at which loss of drilling string stability occurs, along with improved resistance to wear and corrosion, even at high temperature
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    Structural reliability of corroded pipeline using the so-called Separable Monte Carlo method
    (Sage journals, 2018) Ben Seghier, Mohamed El Amine; Bettayeb, Mourad; Correia, José; De Jesus, Abílio
    The evaluation of the failure probability of corroded pipelines is an important calculation to quantify the risk assessment and integrity of pipelines. Traditional Monte Carlo simulation method has been widely used to solve this type of problems, where it generates a very large number of simulations and takes longer time in computing. In this study, enhanced computational method called Separable Monte Carlo is employed to evaluate the time-dependent reliability of pipeline segments containing active corrosion defects, where a practical example was used. The results show that the Separable Monte Carlo simulation method not only minimizes the computational cost strongly but also improves the calculation precision.