Benefits ? Improved wellbore stability while lowering operational costs ? Improved ROP and reduced mud weight by 2.5 ppg ? Maintained temperature stability of 275-300°F Well background and challenges ? The Sirte Basin, Libya ? Problematic shale and evaporite sequences ? Two liner sections ? High mud weights (15.5 ppg) to stabilize Sirte and Rachmat shales, and Etel evaporites • Pore pressure transmission • Mechanical instabili

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