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Part X Oil Muds

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   Advanced Mud SchoolPart X Oil Muds Presented By: Jeff Imrie  August 2006  PFM Oil Muds ã The srcin of non-aqueous drilling fluids can be traced to the 1920s when crude oil was used as a drilling fluid. ã The advantages of oil as a drilling and completion fluid were obvious even then:  –Clays do not hydrate and swell. –Wellbore stability is improved. –Production is improved from sandstones containing clays. –Problems are reduced when drilling evaporites(salts, anhydrite, etc). –Wellbore enlargement is reduced. –Mud properties are more stable. –Contamination resistance is increased.  PFM Oil Muds ã Oils also have certain characteristics that are undesirable.  –They are flammable and may contain compounds that cause the failure of rubber goods such as hoses, O-rings, gaskets and Blowout Preventer (BOP) elements.  –Oils lack gel structure and are difficult to viscosifyso they can be weighted.  –Many oils contain toxic or hazardous compounds that cause Health, Safety and Environmental (HSE) concerns.  PFM Oil Muds  –They have high gas solubility for many of the gases encountered when drilling wells (natural gas, carbon dioxide and hydrogen sulfide). –This can interfere with kick detection and well-control procedures.  –Oils may not degrade readily under certain conditions. –Oils also float on water and can migrate a significant distance from their source
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