108 copyrightc 2005 by ali ghalambor boyun guo 54

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Unformatted text preview: onventional procedures. These are minor procedure differences, though, that can play an important role in this type of operation. 108 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 54 Basic blowout preventer design logic has been extended to subsea preventers with several precautionary components added. The basic blowout preventer stack(Fig.8) included tow annular preventers rather than the conventional solitary unit. Shear rams are place on the bottom of the stack. 109 Fig.7 110 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 55 Mud displacement in the choke line as a result of gas being pumped from the well has used great concern. Fig.9 demonstrates another problem inherent with deepwater drilling.After the well is dead, the annular preventer cannot be opened because of the original density mud in the riser. It is necessary to close the bottom set of rams and reverse circulate kill density mud down the choke line and up the riser in order to completely kill the well 111 Fig.8 Fig.9 Copyright(c) 2005 by Ali Ghalambor & Boyun Guo 112 56 Accum...
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