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2. Drilling fluids: state of art;Caenn;J. Pet. Sci. Eng.,1996
3. Field experience shows that new lubricant reduces friction and improves formation compatibility and environmental impact, SPE 112483;Foxenberg,2008
4. Techniques for solving torque and drag problems in today's drilling environment, SPE 48939;Aston,1998
5. Microbeads as lubricant in drilling muds using a modified lubricity tester, SPE 14797;Skalle,1999