wells

1. GS EP SAF 226
-Completed wells safety systems
and safety rules-
rev. 04
EN

2. 2
GS EP SAF 226 rev. 04 – main modifications
General
 This document highlights the main modifications brought to GS EP SAF 226.
 It is not intended to be exhaustive.
What is the purpose of the revision?
 Update following EP branch re-organisation (March 2011)
 Update of reference document list
 Wording changes for a clearer distinction between Company’s requirements and
recommendations
 Revision of the section related to SIMOPS
 Addition of a new section specific to subsea well safety systems
EP/DEV/ED/ECP – October 2011

3. 3
GS EP SAF 226 rev. 04 – main modifications
Summary of modifications
 Section 1: scope modification to include subsea systems
 Section 3: change of terminology for annulus (first annulus = annulus A; first
surrounding casing = annulus B etc)
 Section 9: simplification of this section related to Simultaneous Operations – the
safety requirements remain the same as before
 Section 10: new section dedicated to subsea systems
 Appendix 1: modified to cover subsea wells / for all completed wells, the annulus
DSHV is not considered as part of the internal barrier envelope anymore
 Appendix 7: new appendix regarding typical subsea wellhead safety logic diagram
 Appendixes 8 to 10: new appendixes regarding typical production / gas injection /
water injection wellhead arrangements
EP/DEV/ED/ECP – October 2011