How Do I Prevent Damage to Coatings on an Agressive Substrate HDD?
We have all had the occasion to pull the first couple of joints out on an HDD and the coating is extremely damaged.
#1 Look at the alignment of the pipe in the drill hole. Is there a sharp turn in the drill? If there is, the pipe may be dragging on an abrasive ledge.
#2 Is the drill of adequate diameter for the substrate conditions?
#3 Was the drill cleaned and swabbed well before the pull?
#4 Was there enough high viscosity mud pumped in to fully lubricate the pipe? There is nothing worse than a dusty pull.
#1 Was the ARO applied uniformly per coating manufacturers specifications?
#2 Are there any high asperity areas on the pipe? Spiral Weld pipe is always subject to some damage on the welds.
#3 Was the girth-weld coating applied to the correct mils across the weld area?
#4 Does the girth-weld coating transition smoothly from parent coating over the cap weld, with no catch points?
#5 Are the button welds and cap welds even and not too high?
Have more questions about HDD and Coatings? Contact a USI Technical Consultant Today 248.735.7000 or office@officeusigroups-com