| http://www.w3.org/ns/prov#value | - A drilling fluid comprising a solution in oil, wherein the oil is in the continuous phase, of at least about 0.1 percent by weight of an organic material selected from the group consisting of compounds represented by the following general formula: wherein R is an alkyl radical and X is an anion of an acid said amount of said organic material present being in excess of that necessary to suspend sol
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