TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractRe-injection of drilled cuttings into a subsurface formation has become a common practice for handling oil wet cuttings during drilling operations in the North Sea areas. Currently, re-injection is technically a straightforward process both on fixed installations and subsea developments. Furthermore, it is feasible to re-inject cuttings into the same well as being drilled.Environmentally, cuttings re-injection is currently considered as an optimum solution. Emission of CO 2 and further unfavourable environmental effects associated with the introduction of heavy and sophisticated equipment on the rigs compromises the priority. The paper outlines the emissions of CO 2 from offshore re-injection operations and onshore treatment in the North Sea area. The rationale behind the priorities governing best handling option is critically addressed. It is shown that emissions to air are significantly reduced when cuttings is re-injected as opposed to treatment on land. This is even more expressed when 12 ¼"-sections are drilled since these operations require additional boats to handle increased volumes of drilled cuttings. If seabed deposition of oil wet cuttings was an accepted alternative, it is shown that the CO 2 emissions would be significantly reduced.
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