Evaluation of behind-pipe saturation in a miscible CO2 flood

Document Type

Conference Proceeding

Publication Date

11-6-2008

Abstract

To evaluate the amount of bypassed oil in a CO2 flood, it is necessary to obtain some estimate of the remaining oil saturation. Near wellbore oil saturation determination requires a tool or sequence of tools that is able to distinguish oil from other phases that may be present in situ especially when those phases are miscible with the oil. This paper presents the combined use of several neutron tools to evaluate the remaining oil saturation in a miscible CO2 flood. These techniques are not time lapse techniques and so are applicable even where there are no base cased-hole logs to evaluate. These methods are applicable in areas where CO2 has been injected for a long period of time without a base pre-CO2 log. The techniques work best with a full suite of open-hole logs to characterize the petrophysical properties of the well and where heterogeneity effects control the displacement process. If petrophysical properties are known or reasonably estimated from other data available, the proposed methods can provide an estimate to the oil saturation that should be adequate to allow go/no go decisions. Copyright 2008, Society of Petroleum Engineers.

Publication Source (Journal or Book title)

Proceedings - SPE Symposium on Improved Oil Recovery

First Page

1166

Last Page

1177

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