TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn Nigeria today, the environmental acceptance of a non watersoluble drilling mud base fluid depends not only on its toxicity as measured from traditional bioassays, but also on its biodegradation under aerobic and anaerobic conditions. Presently, however, there is no widely accepted laboratory method for biodegradability assessment of drilling fluids.Based on its relevance to environmental conditions affecting the biodegradation of drilling fluids, the recently developed Solid Phase Biodegradation Test Method was chosen for assessment of drilling fluids in Nigeria. The test was modified, essentially to ensure better simulation of Nigerian environmental conditions. Thus, the Nigerian version of the method is a 60 day "closed system" Test that entails the assessment of a given sample in both fresh and brackish/marine water simulated environmental conditions. The biodegradation assessment of three drilling fluid types: an ester, an olefin and a mixture of both was carried out using the Nigerian version of the Solid Phase Test. The results obtained are presented in this paper. They compare favorably with and validate other Solid Phase Test results, which show olive oil to be a ready degradable substance and esters as having a generally higher percentage degradation than other synthetic base fluids. In this test, percentage biodegradation was observed to be higher in the brackish/marine water than in the freshwater simulated environment.
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