Compact Insert-Retrievable Chokes | Schlumberger Products

Compact Insert-Retrievable Chokes

Total vertical access for insert retrieval

Our latest innovation is the revolutionary subsea insert-retrievable compact choke with a dog-in-window connector that offers substantial advantages. This type of subsea insert-retrievable choke is 35% smaller and 45% lighter than a traditional clamp running tool (CLRT) subsea choke. It also provides total vertical access for insert retrieval. Total vertical access is achieved via push/pull rods that engage/disengage dogs for insert installation and retrieval, with the option of hydraulic override for disconnect. And, because it requires no horizontal access, the choke can be more centrally placed, potentially reducing the size and weight of the production tree and manifold significantly. In addition, installation is simple enough for smaller, more readily accessible vessels to handle.

The compact choke features our field-proven hydraulic stepping linear choke actuator (SLCA), along with an increased trim cavity and annular area for reduced flow velocity and a more uniform fluid presentation to trim. Several cage-style trims are available, including plug and cage for reverse and forward flow and maximum Cv, and water injection multistage, the choice for long-term operation in cavitation-sensitive conditions and reverse flow applications.

Render of yellow and orange compact insert-retrievable choke valve.
Specifications  
Pressure ratings
10,000 psi
Water depths
9,800 ft
Temperatures range
–50 to 250 degF [–46 to 121 degC]
Trim sizes
2–4 in
Max. Cv
282
Actuation
Cameron SLCA hydraulic stepping linear choke actuator (3,000- or 5,000-psi supply)
Position feedback
Linear variable differential transformer analog (4 to 20 mA)
Intervention
Dedicated compact choke running tool
Service life
20 years (excluding wearing trim elements)
Certification
API Specs 6A and 17D, ISO 10423 and 13628-4, NACE MR0175, NORSOK
Model
Description
Nominal Size, in
Max. Working Pressure, psi
Max. Cv
Flow Curve Type
CC30SRC
Gas lift
3
10,000
80
Plug and cage, linear
CC40SRC
Production
4
10,000  224
Plug and cage, equal percentage
Production
4
10,000
282
Plug and cage, linear
Reverse-flow water injection
4
10,000
216
3-in, three-stage, multistage, equal percentage

Nominal size refers to the seat nominal diameter, not the inlet or outlet end connection size.

Reduced-capacity and custom trims available.

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