Well Examination Handbook - Source
Well Examination Handbook - Source
Well Examination Handbook - Source
NRG
Table of Contents
Introduction and Purpose
What is Examined?
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Reporting Relationships
4. REPORTING RELATIONSHIPS FOR THE EXAMINER
The well examiner is, by definition, independent of the line management
responsible for the safety of well design and operations. However, there
needs to be a method to resolve any issues or reservations, should they
occur during the examination process. In addition, the well examiners are
accountable to BG Group for their performance and a reporting relationship
that allows BG to assess the company (by audit) is necessary.
During the well examination process the normal communications channel is
with the well operations engineers responsible for the design process. The
project team leader is normally the focal point.
Should the examiner have any issues that cannot be resolved to his
satisfaction then he is able to take these to the Asset Drilling (or Production)
Manager. Should any concerns remain, then he can raise these with the Asset
Manager and, if necessary, call on the Asset Safety Advisor. A written audit
trail will always be prepared for such issues.
In addition, the examiner is able to discuss issues with WEPO in Reading.
This may be to resolve any issues surrounding the BG Group standards
applicable to well operations.
The Asset is responsible for the well examination budget. However, WEPO is
responsible for the appointment of the examiner and for auditing the work
against the well examination standards. (The Well Examination Scheme and
this Handbook contain the well examination performance standards).
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What is Examined?
5. DOCUMENTATION EXAMINED
Well examiners require two types of documentation (see Sections 5.1 and
5.2) in order to carry out examination. This documentation is the BG Group
management standards and programming that contributes to the reduction of
risks to personnel arising from well operations to a level that is As Low As
Reasonably Practicable (ALARP). This is a legal requirement in the UK.
5.1 Company Standards For Well Operations
The WEPOMS Management System contains all the company's generic
standards for well design and operations. These include:
Well Engineering Policies and Guidelines Manual (WEPGM 01)
Well Examination Scheme (WSD WE 01)
Casing Design Manual (WSD CD 01)
Casing and Cementing Operations Manual (WSD CC 01)
Well Control Manual (WSD WC 01)
Drill String Manual (WSD DS 01)
Directional Design and Surveying Manual (WSD DD 01)
Working in an H2S Environment (WSD H2S 01)
Completion Manual (WSD CM 01)
Well Services Manual (WSD WS 01)
Well Testing Operations (WSD WT 01)
The Well Examiner has access to these documents. Any dispensations from
these standards that may be required from WEPO for a particular well,
should be referred to in the individual well programme. The examiner
should be made aware of any dispensation and may raise issues but he is
not responsible for the dispensation process.
5.2 Well-Specific Documentation
The list of documents overleaf are typical of those examined at the well
programming phase. Daily operations reports are used to verify that the
operations have been completed in accordance with the programme.
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What is Examined?
a. For Drilling Operations:
Well proposal (from the exploration team)
Well basis of design documentation
Drilling programme
Casing design/kick tolerance documentation
Testing programme/basis of design documentation
Suspension or abandonment programme
Government notification (if required)
b. For Completion Operations:
Completion basis of design documentation
Tubing stress analysis report
Completion programme
c. For Well Intervention and Workover Operations:
Well status description and diagrams
Intervention/workover programme
Re-completion design and programme
d. For Production Well Operations:
Production well annulus monitoring reports
Tree test results
Tree maintenance reports
DHSV test results
Programmes should contain sufficient information to demonstrate that all
relevant risks arising from foreseeable hazards have been assessed and that
measures are in place to reduce these to as low as reasonably practicable.
For example: Tubing burst and collapse hazards have been considered
andcalculations made to ensure that the risks are reduced by selecting the
correct tubulars. Such measures are usually self-evident but for more
unusualoperations a specific risk assessment may need to be included, e.g.
welltest hazard assessment and risk reduction flowchart.
5.3 Well Equipment Examination
See Section 7 for details of well equipment examination.
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NRG Limited
242 North Deeside Road
Peterculter
Aberdeen
AB14 0UQ
Phone: +44 (0) 1224 732475
Fax: +44 (0) 1224 735505
E Mail: safety@nrgltd.com
Web: www.nrgltd.com