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Simulation of Drilling Fluid Filtrate Invasion Near an Observation Well

Authors
Romain L. Chassagne (Schlumberger Cambridge Research) | Paul Hammond (Schlumberger Cambridge Research)
DOI
https://doi.org/10.2118/154014-PA
Document ID
SPE-154014-PA
Publisher
Society of Petroleum Engineers
Source
SPE Journal
Volume
17
Issue
04
Publication Date
December 2012
Document Type
Journal Paper
Pages
1,047 - 1,055
Language
English
ISSN
1086-055X
Copyright
2012. Society of Petroleum Engineers
Disciplines
5.5 Reservoir Simulation, 5.6.1 Open hole/cased hole log analysis, 5.2.1 Phase Behavior and PVT Measurements, 1.11 Drilling Fluids and Materials, 1.8.5 Phase Trapping, 5.4.1 Waterflooding
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Summary

We used a commercial reservoir simulator to study, first, the dissipation of aqueous drilling fluid filtrate invasion around a cased observation well in an oil-saturated formation under the action of capillary pressure and, second, the interaction of a waterflood front with the cased well and remaining invaded zone. Hysteretic behavior of the capillary pressure and relative permeabilities is critically important to these processes and is taken into account by the use of the Carlson model, with the various bounding drainage and imbibition curves computed from a pore network model.

Filtrate invasion into a hydrocarbon formation influences the readings of well-logging tools. Although this phenomenon has been known, and corrected for, for many years, uncertainty remains with regard to the long-time behavior of invasion around observation wells where no flow in or out of the formation occurs after completion, and with regard to the influence of formation wettability. We find that after sufficient time, the invaded zone dissipates completely in a water-wet formation, but some invasion always remains in the oil/mixed-wet case. Nonwetting-phase trapping, manifested through relative permeability hysteresis, is the cause. Because trapping affects the values and the endpoints of the relative permeability curves, a waterflood front passing across an observation well is more distorted in the oil/mixed-wet case. The simulation results allow us to understand how logging-tool measurements made in cased observation wells are influenced by drilling-fluid invasion and will therefore lead to improved interpretation. This study shows strong links between the wettability of the formation and the persistence of invaded zone saturation and between invaded zone saturation and the distortion of subsequent flood fronts.

File Size  932 KBNumber of Pages   9

References

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