The Shuler Jones Sand Pool; Nine Years of Unitized Pressure-Maintenance Operations
- Jack Tarner (Phillips Petroleum Co.) | W.R. Evans (Phillips Petroleum Co.) | H.H. Kaveler (Phillips Petroleum Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 1951
- Document Type
- Journal Paper
- 121 - 126
- 1951. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 5.7 Reserves Evaluation, 5.1.1 Exploration, Development, Structural Geology, 6.5.2 Water use, produced water discharge and disposal, 1.6.9 Coring, Fishing, 2.4.3 Sand/Solids Control, 5.6.4 Drillstem/Well Testing, 5.4.2 Gas Injection Methods, 4.3.4 Scale, 4.6 Natural Gas, 1.2.3 Rock properties, 5.5.2 Core Analysis
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The geological features, development history and engineering detail of theShuler Field and the results of approximately two years of unitized operationof the Shuler Jones Sand Pool, were discussed in a prior publication. Thepurpose of this paper is to present the results of pressure maintenance in theShuler Jones Sand Pool after nine years of unit operation.
The Shuler Jones Sand Pool is located in and about Section 18, Township 18South, Range 17 West, Union County, Ark. The pool was discovered in September,1937, unitized in February, 1941, and subjected to gas injection operations inJuly, 1941. Water was first returned to the reservoir in July, 1944.
The reservoir is an anticlinal trap covering about 4,000 acres. The 154,000acre-ft of sandstone initially consisted of approximately 150,000 acre-ft ofproductive oil zone and 4,000 acre-ft of gas-cap. The average depth ofproduction is 7,400 ft. Maximum closure of the reservoir is 135 ft and the oilcolumn lies between a gas-oil contact at -7,270 ft and a water-oil contact at-7,370 to -7,380 ft. The field is approximately four miles long, east and west,and one and one-half miles wide.
The sand grains are angular and vary from fine to medium size. The porosityof the sandstone averages 20.2 per cent. The specific permeability averages 400md. Some zones have as high as 30 per cent porosity and specific permeabilityof 4,000 md. The reservoir rock is not uniform in character but consists ofsandstone zones interspersed with shale. The variation in rock characteristicsis evident in the electric log and core analyses presented in the originalpublication. Asphalt present in the pore space of the sandstone limited thereservoir to the southeast and apparently blocked any encroachment of waterfrom that direction.
The initial reservoir pressure at a subsea depth of 7,300 ft was 3,520 psi.The reservoir temperature was 198?F. Initially, the solution gas volume was 765cu ft per bbl and the reservoir volume factor was 1.45. The equation for thegas volume factor presented is based on a direct measurement of a sample of thegas and is a correction of that used in the original paper.
The gravity of the oil produced is from 32 to 34? API.
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