Welcome to another post in our DPM-EduSeries! Today we will be looking at Cold Rolling and Make & Break!

Cold Rolling and Make & Break are optional processes for API connections but mandatory processes for DPM proprietary connections.

The purpose of cold rolling the thread roots and flanks is to induce a compressive layer which reduces the susceptibility to cracking thus enhancing fatigue resistance. A macroscopic image of a cold rolled thread root is shown below.

Make & Break of new tool joints reduces the likelihood of service damage to the connection including galling and downhole make-up. It is recommended to carry out the Make & Break process at the tool joint manufacturing facility in a controlled environment instead of on the rig to eliminate rig handling time and cost. An example of a make/break unit is shown below.

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