Subsea BOP arrangement

06 April 2012 Hello,
Presently working on a moored rig, the BOP stack is a conventional Hydril 18 ¾” 15M. It´s arrangement is:
1/ As per API: CwRdRdA*Cr
2/ Or from Bottom to top: Vetco 16 ¾” H4 DxE 10M, One Double dressed with 5” pipe ram and another 5” pipe ram, One extended double with 4 "” - 7” variable ram, and one blind shear ram, One GX 18 ¾” 10M annular.
The LMRP is fitted with 18 ¾” H4 ExF 10M, One GX 18 ¾” 10M annular.
(See attached schematic for better understanding).
Question is what is the logic of this configuration, why we would have the lower annular on the lower stack, the choke and kill manifold has been configured by operator, but what is the logic there. Basically what would be the advantages of having this BOP arrangement rather than another.
I looked into IADC manual as well as in API RP 53 where it says you can have several kind of BOP arrangement, but does´nt really explain the advantages of such or such configuration.
Thanks for your help, best regards,
Pierre

Documents uploaded by user:

Hydril stack configuration.pdf

3 Answer(s)

---