Overview

Cameron has several insert retrievable subsea choke retention designs, including the clamp-style choke.  The simple clamp mechanism for latching the insert to the choke body is a robust, ROV/diver-friendly system. A remotely operated tool lowers the insert with its clamp assembly into the choke body.  Guide pins align the insert, and hydraulic and electrical connecters automatically mate as the insert is soft landed. Finally, the ROV operates a single threaded shaft to close the clamp segments.  Our large bore CC80SR subsea insert retrievable choke utilizes the OneSubsea Vertical Connector CVC collet type connector.

We have developed configurations to allow retrieval of the clamp style chokes by the Cameron dedicated Clamp Running Tool (CLRT) or a third-party Deepwater Liftline Running Tool (DLRT) or Multi-Purpose Running Tool (MPRT). The CC80SR CVC collet-type large bore insert retrievable choke uses the standard OneSubsea CVC Running Tool. 

Specifications

Insert-retrievable choke design highlights:

  • Pressure ratings up to 15,000 psi
  • Water depths to 9800 ft (3,000m)
  • Temperature ranges from -50° F to 350° F (-46° C to 177° C)
  • Trim sizes from 2" through 8", with Cv up to 1,000
  • Cameron’s SLCA™ and AquaTorq™ hydraulic stepping linear choke actuator (3k or 5k supply)
  • Position feedback – Linear variable differential transformer (LVDT) analog (4 mA to 20 mA) or digital CANBus
  • Designed for 20 years of service life, excluding wearing trim elements 
  • Meet or exceed all API 6A/17D, ISO 10423/13628-4, NACE MR-01-75/ ISO 15156 and NORSOK requirements

 

Subsea Insert Retrievable Choke Summary:

 Choke
 Description
 Nom. Size*
 MWP psi
 Max Cv**
 Flow Curve Type
 CC20SR
 Clamp Insert Choke- Gas Lift
 2”
 10,000
 14
 P&C EQ%
 CC20SR
 Clamp Insert Choke- Gas Lift
 2"  10,000
 8  P&C EQ%
 CC30SR
 Clamp Insert Choke- Gas Lift/Production
 3”
 10,000
 46  ES Linear
 CC40SR
 Clamp Insert Choke- Production
 4”
 10,000  288  P&C Linear
 CC40SR
 Clamp Insert Choke- Production
 4”
 15,000
 241  P&C EQ%
 CC40SR
 Clamp Insert Choke- Production
 4”
 10,000
 200  P&C EQ%
 CC40SR
 Clamp Insert Choke- Reverse Flow Water Injection
 (DBA Multi-Stage Anti-Cavitation Trim)
 4”
 10,000
 206  Single Stage
 CC40SR
 Clamp Insert Choke- Reverse Flow Water Injection
 (DBA Multi-Stage Anti-Cavitation Trim)
 4”
 10,000
 130  Two Stage
 CC40SR
 Clamp Insert Choke- Reverse Flow Water Injection
 (DBA Multi-Stage Anti-Cavitation Trim)
 4”
 10,000
 94  Three Stage
 CC50SR
 Clamp Insert Choke- Production
 5”
 10,000
 500  P&C Linear
 CC50SR
 Clamp Insert Choke- Production
 5”
 10,000
 345  P&C EQ%
 CC80SR
 Collet Connector insert choke – Production large bore gas
 8”
 7,500
 757  P&C EQ%
 CC80SR
 Collet Connector insert choke – Production large bore gas
 8”
 7,500
 1,000  P&C Linear

* Nom. Size refers to the seat nominal diameter, not the inlet or outlet end connection size.

** Reduced capacity and custom trims available.

P&C = Plug and Cage

ES = External Sleeve

EQ%= Equal Percentage

MS33= 3", Three-Stage, Multi-Stage