The Phase Behavior of a Natural Hydrocarbon System
- Charles F. Weinaug (University of Kansas) | Howard B. Bradley (Phillips Petroleum Fellow, University of Texas, Austin)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- August 1951
- Document Type
- Journal Paper
- 233 - 238
- 1951. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.2.1 Phase Behavior and PVT Measurements, 4.1.5 Processing Equipment, 4.1.2 Separation and Treating, 5.2 Reservoir Fluid Dynamics
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The phase behavior of a naturally occurring hydrocarbon system whosecritical temperature is near the reservoir temperature has beendescribed.
The same volume per cent liquid was observed for the first time at threedifferent pressures for isotherms immediately below the critical temperature.The shapes of the isothermal equilibrium constant curves necessary to predictthis phenomena are discussed and illustrated.
The phase behavior of a number of hydrocarbon systems has been reported;however, very little data are available on natural occurring hydrocarbonsystems whose critical temperature is near the reservoir temperature. Thisappeared to be the case for the fluid studied here; therefore thepressure-volume-temperature data for this system were determined forpresentation.
The PVT data were obtained with equipment similar to that described byWeinaug and Katz, consisting principally of a two-section, double-windowedgauge mounted in a constant temperature air bath. The procedure followed wasessentially that used by Katz and Kurata except that a cathetometer, readingdirect to 0.01 cm, was used to determine the height of each extreme phaselimit.
The system studied was formed by recombining vapor and liquid samples from thefirst stage separator of the well. Portions of these samples were displacedwith mercury into the cell which had previously been filled with mercury. Apredetermined amount of the liquid sample was introduced, while an excess ofvapor was admitted. The resulting mixture was brought to equilibrium at thecondition of the separator during sampling. By adding mercury to maintain thepressure, enough vapor was displaced to give a gas/oil ratio within the cellequal to that produced by the separator at the time of sampling. The remainingmaterial was then considered to be equivalent to the reservoir fluid. Ananalysis of material in the cell, computed from analysis of vapor and liquidsamples and the separator gas/oil ratio, is given in Table I.
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