Abstract
Summary Laboratory tests conducted to investigate the possibility of using oil muds through the Zechstein formation of the Viking field showed that diesel-oil muds formulated with sodium- and/or calcium-type emulsifiers could break down if the wrong treatment was used to counteract contamination from the solubility of magnesium minerals. However, oil-mud samples prepared with magnesium compounds offered good mud stability and did not dissolve the contaminant. Therefore, this formulation was selected for a field test on a Viking well; this paper reviews the results. Drilling data from previous wells in the area are compared with values measured on the test well. Results indicate that the magnesium oil muds can provide a gauge hole in the bischofite/camallite zones that occur within the Zechstein formation.
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