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Mahmoud Asadi, SPE, ProTechnics, and G. Michael Shook, SPE, Chevron ETC
Secondary recovery is a process in which reservoir fluid is mobilized and moved
from an injection well toward a production well. The success of this process greatly
depends on the knowledge of reservoir continuity and uniformity, in terms of fluid
transmissibility, and how much of the reservoir fluid volume can be contacted by
the injection fluid. In any water/gas flood injection project, fluid channeling
through mini-fractures, faults, and high permeabilitystreaks results in problems
such as poor reservoir sweep efficiency and low hydrocarbon recovery. Therefore,
knowledge of direct communication between the injection and production wells as
well as an understanding of formation heterogeneity can be of great help to overcome
these problems. While techniques such as seismic, mapping geological deposition
and reservoir simulation provide valuable information about the feasibility of secondary
recovery projects, tracer testing is the only available method that provides valuable
information on direct communication, flow-path, and formation heterogeneity across
the injection and production wells. This paper presents a detailed review of chemical
tracer applications in IOR with a supportive case history from a water-flood field.
The paper also presents interpretation and discussion of the results on direct communication
identification, formation heterogeneity evaluation, and swept pore volume calculation.
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