XT 57, Tight Drillpipe Connections

02 December 2007 We have a sting of 5 7/8" Grant Prideco Drillpipe with a XT57 thread.
We are having major problems with the tool joints not breaking.We now
have had to purchase a set of HT200 rig tongs. As it can take up to
110k to break the joints.

The drillpipe has the treads cleaned, and pin and box re-dopped on
each trip. A drilling break of the string is done off bottom on every
trip. The max TQ seen on the string is 30kft/lbs, downhole temp is
105 deg C. The drillpipe is made up to 50kft/lbs and Koper-Kote dope
is used.

Is there anyone out there who have this string and DO not have this
problem?

1 Answer(s)

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