HT Deep Horizontal Gas Drilling in Challenging Conditions

Reservoirs consisting of sandstone and conglomerates nature present the most challenging reservoirs in the<br>fields of North Oman. The target formations are often very deep with elevated static bottomhole temperatures<br>exceeding 157degC, and with severe potential risks associated with geo mechanical and drilling perspectives.<br>Tectonic stresses, where principal horizontal stress greatly exceeds vertical and minimum horizontal stresses, are<br>coupled with rock compressive strengths varying between 45,000 and 50,000 psi with medium abrasiveness.<br>These factors, together with borehole instability, borehole break-out phenomena, problems with conventional<br>steerable systems due to weight transfer using turbines as well as drill bit sticking, present particular challenges in<br>these wells and require significant up-front engineering resources to be deployed.