Page 150 - Well Control for Completions and Interventions

142 Well Control for Completions and Interventions

Annular preventer
Annular preventer

Ram preventer
Ram preventer Choke and kill line outlet
Ram preventer
Ram preventer Choke and kill line outlet

Drilling spool Ram preventer

Ram preventer Drilling spool

Wellhead Wellhead

Figure 4.3 Blow out preventer configuration for 10,000 and 15,000 and 20,000 psi
working pressure.

For a two-ram configuration, most operators and drilling contrac-
tors recommend configuring the stack with a shearing blind ram
(SBR) below a pipe ram (or annular preventer). This allows a joint of
pipe to be placed on top of a leaking blind ram and the closure of the
pipe ram above a tool joint. The pipe in the BOP must have a FOSV
installed and the space between the bottom of the pipe ram and the
top of the blind ram must be long enough to accommodate the tool
joint.
Having the blind ram below the pipe ram (or annular) allows the
pipe ram seals (or annular seal) to be changed out when the blind ram
is shut.
2. Configuration for 3000 and 5000 psi working pressure BOP stacks
The minimum requirements for 3000 and 5000 psi BOP stacks are
fundamentally the same. The stack should have:
• Annular preventer.
• Two pipe ram preventers (either a double ram preventer or two
singles).
• Kill and choke lines can be connected to the inlet of the ram BOP
or to a drilling spool.
• Kill and choke line must be at least 2 in. nominal diameter.