Shaffer Spherical Annular BOP

Spherical Sealing ElementSpherical Sealing Element

Cameron “D” Annular BOP

Cameron D Sealing ElementCameron D Sealing Element

Annular BOP Concerns

• Durability with heavy use and testing• Back-off closing pressure for stripping• Match element selection with mud type• Exposure to sunlight• Storage Life• Closing on open hole not recommended

Ram BOP

• Annulus is sealed by two “half-gates” called “ram blocks”

• Ram blocks fit only one pipe size or a very limited range

• Hydraulically actuated

• Can install blind rams & shear rams

Cameron Ram Blocks

VBR & Flexpacker Policy (Surface Stacks)

• Never in lower ram• Test on all pipe sizes• Replace flexpackers

with fixed bore rams prior to stripping

• VBRs close on all pipe sizes within the range

• Flexpackers fit only specific pipe sizes

VBR

Flexpacker

Choke and Kill Lines

Choke Line: 3” min IDChoke Line: 3” min ID Kill Line: 2” min IDKill Line: 2” min ID No Chiksan swivel for choke lineNo Chiksan swivel for choke line Flexible lines okay if:Flexible lines okay if:

– meet API 16C specsmeet API 16C specs– proof of certification kept at rigproof of certification kept at rig– flanged connectionsflanged connections– tested to WP of ram BOPstested to WP of ram BOPs– inspected on initial rig up & change outinspected on initial rig up & change out– include borescope inspectioninclude borescope inspection

Currently approved and certified by API:Currently approved and certified by API:– Coflexip (Technip)Coflexip (Technip)– Taurus (Phoenix Rubber Company)Taurus (Phoenix Rubber Company)

TV Monitor displays TV Monitor displays image from borescope image from borescope cameracamera

Choke Manifolds• Minimum requirements in BOPE

Manual (Sect 6)

• Chokes closed

• Valves downstream of chokes closed

• Components upstream of valves at choke exits must have same pressure rating as BOP stack

• Flanged Connections

• Be able to by-pass buffer chamber while circulating through at least one choke

Power Choke Example

Throttle valve at end of the “choke Throttle valve at end of the “choke line”line”

Typically 3” ID end connectionsTypically 3” ID end connections

Hydraulically poweredHydraulically powered

Swaco has two circular plates – Swaco has two circular plates – one rotatesone rotates

Swaco Super ChokeSwaco Super Choke