Torque Reduction and Casing Protection in Unstable Hole Conditions

Executive Summary

A major international operator in Asia Pacific was drilling a directional well in deep water with a high directional angle that raised torque and casing wear concerns while drilling the 8-1/2”x10-1/4” and 8-1/2” sections and sidetracks.

Actual operation required milling window and several cement plugs to attempt sidetracking the well until a successful 3rd attempt was achieved. In addition to these unexpected challenges, unstable hole conditions and large cavings were encountered.

WWT Non Rotating Protectors (NRPs) were utilized on the majority of these operations without any issues. 54-60 SS3-550 model NRPs were used while drilling the third sidetrack at a frequency of 1 every other joint