B - Operations – Transporting – 08 – B
Patent
B - Operations, Transporting
08
B
31/9
B08B 7/04 (2006.01) E21B 21/06 (2006.01) E21B 41/00 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1329319
ABSTRACT Drill cuttings contaminated with hydrocarbon, such as diesel oil, kerosene or mineral oil, from residual drilling mud are cleaned up to a solid particulate form containing very low amounts of residual hydrocarbon by means of an integrated four-step treatment process. In the first step, the cuttings are conditioned to destroy the complex fluid structure of the material and to break up agglomerations and clumps of solid particles into individual particles. Preferably this is accomplished by addition of a compatible hydrocarbon diluent under shearing agitation. Secondly, the destabilized contaminated cuttings are subjected to centrifugation to separate excess liquid. Thirdly, the residual solids are treated, preferably under shearing agitation, with water and an appropriate wetting agent at low concentration to displace residual surface hydrocarbon contamination. Fourthly, the treated cuttings are subjected to a final phase separation step, eg. by centrifugation of the total stream, or by screening and washing the coarse fraction followed by washing and filtration of the fines fraction. The resultant solid material has a residual hydrocarbon content of less than about 6 grams per 100 grams of dry cuttings, largely in a form where it is unlikely to migrate out of the solids to harm the environment, under normal environmentally experienced conditions.
590320
Corti Aldo
Fedirko Leonard J.
Mccorriston Lois L.
Roett Maurice F.
Valdes Carlos J.
Gulf Canada Resources Limited
Mccarthy Tetrault Llp
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