Date of Award

Spring 1968

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Civil, Construction, and Environmental Engineering

First Advisor

Greenkorn, Robert

Second Advisor

Matar, Joseph E.

Third Advisor

Richardson, Bobbie L.

Abstract

The production of oil is accomplished by displacing it from the interconected pores of the reservoir by either gas or water. This thesis deals with artifical water flooding, where the water is injected into the oil bearing sand to displace the oil and remove it through output wells. In actual practice, this oil recovery is complicated by the fact that the reservoir usually isn't homogeneous, that is, the reservoir is composed of large regions of different porosity. It is the purpose of this thesis to investigate how the number, positions, and permeabilities of these heterogeneities affect the streamline pattern and oil recovery. One way of characterizing these heterogeneous regions is by the distortion they cause on the streamline pattern. Chapter II of the thesis explains how the streamline distortion at a circular heterogeneity in a 5-spot pattern is affected by its own position and permeability and by the positions, number, and permeabilities of the surrounding heterogeneities. The affects of heterogeneities on the streamline pattern and oil production were found using Hele-Shaw Xodels, solving the equations governing radial flow in a heterogeneous porous media numerically using a computer, and using potential theory. The thesis concludes that the streamline distortion depends on its own position and permeability and the presence or absence of a heterogeneity immediately in front of the injection well. Chapter III explains how the positions, number, and permeabilities of circular heterogeneities in a 5- spot pattern affects oil production in an artificial water flood. It was concluded that oil production depends largely on the presence or absence of combinations of heterogeneities whose positions are near the diagonal connecting the injection and production wells and that oil production increases linearly with the number of remaining heterogeneities. Knowing how heterogneities affect oil production, the injection and production wells can be placed so as to obtain the highest oil production.

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