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N NEARLY all cases petroleum reservoirs involve structures whose voids are filled partially with water.

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The influence of pressure and temperature on the composition of the dew-point gas of the ethane-water system was experimentally established. The experimental work covered pressures up to 10,000 pounds per square inch in the temperature interval between 100°and 460°F. Data for other aqueous systems of a similar nature are compared with the values obtained and with predictions based upon an assumed thermodynamic behavior for this system.AN UNDERSTANDING of the role played by water in the phase behavior of hydrocarbon systems is important since this component is nearly always associated with petroleum in underground reservoirs. A background of

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