Cameron DSI | Schlumberger

Cameron DSI

Dual-string interlocking shear rams

Cameron DSI dual-string interlocking shear rams are similar in design to DS dual-string shear rams, except for the interlocking feature of the rams. Arms on the upper ram prevent any vertical separation between the lower and upper blades.

The interlocking feature provides the capability of shearing wireline and braided cable with zero tension in the line. DSI rams do not use a foldover shoulder, and thus have the capacity to shear larger diameter pipe and casing.

Shearing action

The DSI ram shearing action is the same as that for DS rams except that when the rams first engage, all separation between the blades is eliminated.

BOP Availability

 
Type Size, in Rating, psi Wireline Capable
U and UM BOPs 7 1/16 3,000–10,000 Yes
U and UM BOPs 13 5/8 3,000–10,000 Yes
U and UM BOPs 11 3,000–5,000 Yes
U BOPs 16 3/4 5,000 Yes
TL and EVO BOPs 18 3/4 15,000 Yes
DSI dual-string interlocking shear ram.
(Left) Cameron DSI dual-string interlocking shear ram, compatible with U and UM BOPs. (Right) 18 3/4-in, 15,000-psi Cameron DSI dual-string interlocking shear ram, compatible with TL offshore ram-type BOPs and EVO compact offshore ram-type BOPs.

Applications

Drilling and production operations that include wireline, braided cable, dual strings, or high-temperature well environments

Benefits

  • Improves performance certainty with interlocking design
  • Enhances operational flexibility by enabling shearing of wireline, braided cable, and dual strings
  • Shears wireline and braided cable with zero tension in the line while maintaining seal
  • Enhances HSE profile by eliminating nonshearables
  • Lowers required shear pressure with more efficient cutting geometry

Features

  • Interlocking arms on the upper ram prevent vertical separation
  • Blades provide full wellbore coverage
  • Lack of foldover enables kill weight mud to be pumped down the drillstring
  • Compatible with U surface ram-type BOP
  • Compatible with UM convertible-bonnet ram-type BOP
  • Compatible with all 18 3/4-in, 15,000-psi Cameron TL offshore ram-type BOPs, 10,000 and 15,000-psi EVO compact offshore ram-type BOPs
  • NACE compatible based on physical testing and finite element analysis

† Excluding 18 3/4-in

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