Fearnley Procter UK Ltd
Standards and Publications
NS-5 Drillstring Failure Prevention Rig Handbook
This Rig Handbook was developed to be an easy reference document for Offshore Personnel who have attended the Onshore Drillstring Failure Prevention Courses run by Fearnley Procter UK Limited.
People who have not yet attended these courses will find this book useful and it will hopefully help them to also play a part in preventing drillstring failures.
Properties, Inspection, and Design of the Drillstring as well as the Rig Operation and the Environment which the Drillstring is exposed to, all contribute to the prevention of Drillstring Failures.
Fearnley Procter UK have investigated the cause of many drillstring failures, and information from these are available to their customers through the Fearnley Procter Failure Database.
Contents of the Rig Handbook:
- Properties of Drillstring Components: Good metal properties in the drillstring is fundamental in reducing failures
- Rig Operations: Using the drillstring correctly can help towards minimising the exposure to a drillstring failure
- Inspection: Specifying the correct inspection procedure and the nature in which they shall be conducted is necessary to prevent equipment failures with the drillstring by identifying problems that limits its serviceability
- Fatigue: Eighty percent of drillstring failures are fatigue related
- Failure Mechanisms and how to recognise them: Its shape, appearance, orientation and location
- If Failure Occurs: What to do to report it
- Failure Prevention Methods: Stress relief features should be machined on all BHA connections NC38 and larger.
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