Miscible Drive Field Applications in the Seeligson Field
- H.T. Wright Jr. (Humble Oil & Refining Co.) | R.R. Die (Humble Oil & Refining Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- May 1958
- Document Type
- Journal Paper
- 13 - 16
- 1958. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.5.2 Core Analysis, 5.2.1 Phase Behavior and PVT Measurements, 5.4.2 Gas Injection Methods, 4.6 Natural Gas, 2.4.3 Sand/Solids Control, 5.1.2 Faults and Fracture Characterisation, 4.1.5 Processing Equipment, 4.1.2 Separation and Treating
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Substantial research has been devoted to the possibilities of greatly increasing oil recovery by injecting into reservoirs a gas known to be soluble in the crude. Various requirements, advantages, and disadvantages of such a displacement have been theorized or indicated by laboratory work. In the final analysis, however, extensive field data are required to evaluate satisfactorily the requirements and merits of a recovery mechanism. In this connection an experimental enriched gas-drive pilot project of full reservoir size was initiated in Zone 20-B of the Seeligson field during March, 1957.
The Zone 20-B reservoir was selected as an injection project for several reasons. A supply of propane for enriching the gas was available from two gasoline plants in the immediate area. Unitization was not required because the zone has only one operator and one royalty interest. The reservoir has a reasonable configuration, the sand is comparatively uniform, and development is adequate. Another major reason for selecting Zone 20-B is that the saturated crude from this reservoir is similar to substantial reserves in the immediate area so that the data obtained will be useful in the evaluation of other projects.
Geologic and Reservoir Data
The Seeligson field is located in Jim Wells and Kleberg counties of Southwest Texas. The field is on a large anticlinal structure and contains numerous productive sands varying from 4,500 to 7,500 ft in depth in the Frio and Vicksburg formations. Zone 20-B, the reservoir selected for enriched gas injection, is a sand development lying at a depth of 6,000 ft in the basal portion of the Frio formation. Fig. 1, a cross section through three wells in the field, illustrates Zone 20-B and other sand sections. The reservoir has an average sand thickness of 14 ft and a productive area of 585 acres.
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