... Abstract Heavy wall drill pipe has found increasing use for weight on the bit in directional holes and smaller vertical holes and as a transition member to reduce damage in the drill pipe run near the drill collars. In these severe applications, proper use, inspection and maintenance...

... into the hole on drill pipe with the hydraulic valve closed to prevent the entry of well fluids into the drill pipe. The packers then isolate the zone to be tested and the hydraulic valve is opened. The expanded packer supports the hydrostatic weight of the fluid, leaving the zone exposed to the atmospheric...