Drillpipe with thicker walls than regular drilipipe. Heavy-wall is sometimes used in the drillstring to reduce the number of larger diameter and stiffer drill collars. This is true in directional drilling and even in straight holes in certain areas of the country. Some of the advantages of heavy-wall pipe over drill collars are Heavy-wall can be handled at the rig floor by regular drillpipe elevators and slips and can be racked in the rig like regular pipe.
