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Porosity controls on secondary recovery at the Loudon field, south-central Illinois
Interpretation (2016)
  • John S Wagle
  • David H. Malone, Illinois State University
  • Eric Wade Peterson, Illinois State University
Waterflooding has been used as an effective means to enhance oil recovery in mature oil fields for decades.
The success of waterflooding is a function of geology, facies changes, and fluid dynamics, specifically, formation
porosity and permeability. Within the Loudon oil field (Illinois), waterflooding has been used to increase pro-
duction, but the degree of success has been variable. We have used 3D facies modeling was evaluate the var-
iables controlling the success or failure of waterflooding. Three leases within the Loudon field exhibiting varying
degrees of waterflood success were investigated. The K. Stubblefield lease, with the highest mean porosity of
13.5%, responded most favorably to waterflooding, with an increase of more than 750 bbl∕month. Thick, high-
porosity zones are well connected within the lease area, contributing to greater communication among the
injection wells and the producing wells. The Rhodes-Williams lease, with porosity of 11.5%, had an increase
in production of 350 bbl∕month. The model showed that within this lease area, high-porosity zones were either
orientated in directions that provided flow away from production wells or were lower porosity zones that finger
with higher porosity zones restricting flow. The George Durbin lease, with porosity of 11.5%, produced only an
additional 50 bbl∕month. The model suggests that injector wells may be positioned in low-porosity zones and, as
with the Rhodes-Williams lease, the alignment and distribution of the low porosities inhibit recovery within the
producing wells. The 3D models indicated that although porosity plays an important role in the success of water-
flooding, the alignment and distribution of the high- and low-porosity zones play a greater role in the success of
secondary recovery techniques. Our research also demonstrated the utility and workflow of digitizing older
paper well logs to incorporate into modern modeling software.
Publication Date
February, 2016
Citation Information
John S Wagle, David H. Malone and Eric Wade Peterson. "Porosity controls on secondary recovery at the Loudon field, south-central Illinois" Interpretation Vol. 4 Iss. 1 (2016) p. T1 - T13
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