Page 350 - Practical Well Planning and Drilling Manual

Section 3 revised 11/00/bc 1/17/01 12:00 PM Page 326

[ ] Practical Wellsite Operations
3.1.6

within 30 seconds (under 20 in), or within 45 seconds for larger
units. Diverter valves must open fully before the diverter or
annular closes.
12. It should be possible to control pumping operations at the pumps
as well as on the drillfloor.
13. Telescopic joints on floaters should have double seals to improve
sealing when gas is coming out of the marine riser. In this situation,
the TJ is the weakest link, especially if there is significant heave.
14. All fans (including in accommodation) should stop automatically
in the event of a gas alarm.
15. At least one windsock, visible to the driller, should be installed
prior to spudding the well.

3.1.6. Surface BOP Stack Configurations

2000 psi WP classification.

1. One annular preventer, or a double hydraulic operated ram type
preventer (one with pipe rams and one with blind/shear).
2. One full opening drilling spool with two 3 1 /16 in bore side outlets.
However, if a dual ram unit is used instead of an annular and is
equipped with proper sized side outlets, the drilling spool may be
omitted and the kill and choke lines connected to the lower pre-
venter outlets.
3. Two dual purpose kill and choke lines, both connected from the
drilling spool to the kill line and choke manifold. If dual-purpose
lines are not used, the stack will have one dedicated kill and one
dedicated choke line.

3000 and 5000 psi WP classification.

1. One annular preventer.
2. One double or two single ram preventers, one with blind/shear and
the other with fixed or variable bore pipe rams.
3. One full-opening drilling spool with two 3 1 /16 in bore side outlets.
However, if the bottom ram unit is equipped with proper sized side
outlets, the drilling spool may be omitted and the kill and choke
lines connected to the lower preventer outlets.

326