Volumetric Behavior of Oil and Gas from the Rio Bravo Field
- B.H. Sage (California Institute of Technology) | H.H. Reamer (California Institute of Technology)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1941
- Document Type
- Journal Paper
- 179 - 191
- 1941. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 1.10 Drilling Equipment, 4.3.4 Scale, 4.1.5 Processing Equipment, 5.2.1 Phase Behavior and PVT Measurements, 1.6 Drilling Operations, 4.1.2 Separation and Treating, 5.1.1 Exploration, Development, Structural Geology
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Attempts have been made to predict the volumetric and phase behavior ofnaturally occurring hydrocarbon mixtures but these methods have not beenextended to the higher pressures and temperatures that are currentlyencountered in some producing formations. Furthermore, the methods ofprediction at present available have not been tested in a sufficient number ofcases to ensure their applicability to all naturally occurring hydrocarbonmixtures, even at the lower pressures and temperatures. For these reasons thebehavior of a number of hydrocarbon mixtures from a field in which thesubsurface pressures are above 4500 lb. per sq. in. and the temperatures are inthe neighborhood of 250F was investigated.
the objective of this program was to determine the volumetric behavior ofmaterial as it existed in the reservoir as a function of pressure, temperatureand composition. Strictly speaking, this cannot be accomplished in any simplefashion. However, the variations in composition that are encountered within aproducing reservoir my be approximated roughly by means of mixturers made up oftwo arbitrarily chosen constituents. Experience indicates that the liquid andgas phases from a high-pressure gas trap afford a simple source of material forthis purpose. Throughout this discussion the samples of the gas phase andliquid phase from the production trap will be called the "trap-gassample" and the "trap-liquid sample" respectively.
The volumetric behavior of both of the trap samples wasdetermined throughout the temperature interval between 100F and 250F atpressures up to 5000 lb. per sq. in. In addition, the behavior of eightdifferent mixtures containing varying proportions of the two trap samples wasstudied throughout the same temperature and pressure intervals. Theexperimental results yielded information concerning the specific volume of thematerial as a function of pressure, temperature and the relative quantity ofthe trap samples.
The relative amount of each of the paraffinhydrocarbons of lower molecular weight than n-hexane was determined for each ofthe trap samples. In addition,the specific weight, viscosityandaverage molecular weight of the hexanes-and-heavier fraction of thetrap samples and eight systematically chosen mixtures.
The gas and liquid samples were obtained from the production trap of a well inthe Rio Bravo field in California durring the fall of 1939.
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