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Drill Pipe Connection Inspection Optimization

Authors: G. Plessis; D. Delcambre; J. Tumlinson; K. Cunningham;

Drill Pipe Connection Inspection Optimization

Abstract

Abstract The latest generation of drill pipe connections was designed to bring a low cost of ownership, which was confirmed by monitoring the inspection data of hundreds of thousands of connections over the last few years. It established that the 4th generation of double-shouldered connection offers a lower percentage of connection recut, typically half that of other connection designs. However, some users sporadically reported seeing a very different picture, with recut percentages in excess of 50%. This started a reinspection project by the original equipment manufacturer's (OEM) field personnel, using its procedure and taking advantage of the connection design's tolerance for damage. The project included performing minor field repairs on surfaces that qualified. The focus was specifically on the connections marked for recut and ignoring those marked for reface or passed. the same principle of reinspection according to the OEM criteria was used by a major rental company, using an independent source to determine whether the initial inspection data accurately reflected the reality of a string that suffered hard drilling conditions or was being over-inspected. In both cases, we found reinspection numbers showing a very different picture, with cases where the number of connections needing recut fell by more than 90%. A need for fast inspection turnaround drives this practice of over-inspection as the rig moves to the next pad. It also provides comfort by removing the risk of making a bad decision. Marking the connection for repair is fast and safe and requires minimal effort. However, it pushes, on average, two to three times the volume of connections toward a workshop repair. And this massive swing in numbers impacts the cost of asset ownership. More drill pipe may be needed on-site to cope with the volume that is out for repair, or some may need to be rented to top up the string. This process involves more transportation. A bottleneck may form at repair shops where additional cost is incurred to recut these connections. Finally, some asset life is lost as connections can only be repaired a limited number of times before tool joints are too short to be clamped on. For the first time, a thorough study of connection repairs will be shared, with a focus on connection recut numbers. It shows how a reclassification of the inspection can greatly save time, money, and asset life. As a result of the study, a new service has been created to correct, when needed, possible situations of over-inspection. Its objective is to gently push the industry to adopt the new inspection criteria set by the OEM.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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