Application of the Gelatin Model for Studying Mobility Ratio Effects
- Melvin B. Burton Jr. (Texas Petroleum Research Committee A&M Division) | Paul B. Crawford (Texas Petroleum Research Committee A&M Division)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- October 1956
- Document Type
- Journal Paper
- 63 - 67
- 1956. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.7.2 Recovery Factors, 5.4.3 Gas Cycling, 5.4.1 Waterflooding
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A procedure is given which describes how the gelatin model may be used to study the effect of mobility ratio on areas swept before and after breakthrough in fluid injection programs. Differences in mobility ratio are achieved through the proper selection of electrolytes for the invading and displaced fluids. The progress of the front is followed visually and photographed or traced onto plates as desired positions before and after breakthrough. Example applications to standard flooding patterns, vertically and horizontally fractured reservoirs and the in-situ combustion recovery process are presented.
In water flooding, gas cycling and other fluid injection programs, the sweep efficiencies and swept areas after breakthrough are known to depend on the mobility ratio. Previous investigators have described the application of the X-ray technique, stepwise use of the potentiometric model and numerical procedures for studying these problems. Others have described the application of the electrolytic and gelatin models for studying sweep efficiencies at a mobility ratio near one. It is a purpose of this paper to describe a procedure for using the gelatin model to study swept areas at mobility ratios other than one.
The technique developed for gelatin model studies is composed of four phases: the construction of the model, the selection and preparation of electrolytes, the running procedure, and the recording of the swept areas. Each phase is discussed independently in order that the over-all procedure will not be confused.
Construction of the Model
Since some of the advantages of the gelatin model are its economy, and speed, it is desirable to have as small a model as is possible without creating error through the inability to follow visually the progress of the colored front. For this work, it was found that a distance of 4 to 6 cm between salt bridges is convenient to use. Since the size is relatively small, it follows that the gelatin layer must be thin. For this study, 1/8 in. was used as the gelatin thickness in each case.
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