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- W1527884054 abstract "The human, economic and environmental disaster thatfollowed the Deepwater Horizon catastrophe at the Gulf of Mexico inApril 2010 revealed how much the offshore drilling industry relieson the Blowout Preventer (BOP) as the primary means of controllinga 'well kick' or 'blowout'. One of the most important components ofthe BOP are the shear rams which are tasked with cutting thedrilling string in case of an emergency, allowing the blind ramsand the annular type blowout preventer to seal the wellbore andgenerally prevent things from becoming unmanageable. The increaseddrill pipe material strength, the fact that its diameter and wallthickness are eventually optimized (larger and heavier pipe sizes)and the greater water depths in combination with the high drillingfluid density affect the BOP's ability to shear. This studyinvestigates all stages of the shearing process and attempts tooptimize the geometry of the shear blades. In order to do that,simulations are conducted with Finite Element Models (FEM) byutilizing the Impact and Crashworthiness Lab's (ICL) fracturemethodology, the backbone of which is the Modified Mohr-Coulomb(MMC) fracture criterion. Nine cases which involve three differentangles defining the sharpness (cutting angle) and three anglescharacterizing the shape of the blades are evaluated. The optimumconfigurations for the shear blades are investigated based on themaximum required cutting force and the sealing capability. Thesimulations are performed for the TRIP 690 steel as well as for theX70 grade steel. The fracture and plasticity parameters for the X70grade steel are experimentally determined in the ICL lab as part ofthis research. In addition, recommendations for shearing the tooljoints, the connections of the drill pipes, are made based on theFinite Element (FE) simulations. Finally, as a second applicationof the MIT's fracture prediction capability, the process offracture of a pre-cracked drill pipe is solved numerically andcompared with the response of an uncracked drillpipe." @default.
- W1527884054 created "2016-06-24" @default.
- W1527884054 creator A5083086419 @default.
- W1527884054 date "2012-01-01" @default.
- W1527884054 modified "2023-09-23" @default.
- W1527884054 title "Numerical analysis of a shear ram and experimental determination of fracture parameters" @default.
- W1527884054 hasPublicationYear "2012" @default.
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