The undesirability of permitting water to invade oil sands has become an established principle with most American oil operators during the last two decades, and many refinements in technologic practice have been devised in order to prevent such invasion. In some regions the invasion by extraneous water is less harmful than in others, but unfortunately it seems that water is most harmful in those regions in which it is most difficult to exclude. It is impossible to guage the extent to which water intrusion has affected the production of oil in the Gulf Coast fields for they have always been...
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