Non-Aqueous Drilling Fluids (NADF) on Cuttings
Non-Aqueous Drilling Fluids (NADF) on Cuttings : Although most drilling fluids are water-based, some conditions encountered during well drilling operations demand the properties that are only available from non-aqueous drilling fluids (NADFs). In 2009 reporting companies discharged 19,079 tonnes of NADF on drill cuttings. In the past, these NADFs have contained diesel or conventional mineral oil as the primary component (Group I fluids). However the industry has moved to NADFs using low toxicity mineral oil (Group II fluids) and, more recently, enhanced mineral oils and synthetics (Group III fluids). As a consequence of this shift, of the NADF discharged on drill cuttings in 2009, 97% contained Group III base fluids, while 3% contained group II fluids. There were no reports of discharges of Group I fluids
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