--> Abstract: Combining Depositional Environment Theory and Horizontal Wells to Re-Activate an Abandoned Waterflood in Osage County, Oklahoma , Robert Westermark, #90097 (2009)

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Combining Depositional Environment Theory and Horizontal Wells to Re-Activate an Abandoned Waterflood in Osage County, Oklahoma

Robert Westermark1

1Grand Directions LLC

This paper discusses the results of combining the understanding of the depositional environment of an incised valley with drilling horizontal wells to reactivate an abandoned waterflood in Osage County, Oklahoma. The targeted reservoir is the Pennsylvanian Bartlesville Sandstone. By employing a rigorous team effort that included geological depositional interpretations and tracer surveys, a clear picture of the effects of utilizing the existing aquifer for pressure support has emerged.

The reactivated waterflood arose from a 2003 Department of Energy funded project to conduct a field pilot test for a horizontal waterflood. The original pattern of two horizontal producers and a central horizontal injection well proved to be ineffective in mobilizing oil and was uneconomical. The two horizontal producers were re-drilled 180 degree from the original well paths and higher in the reservoir. An existing vertical well located between the redrilled horizontals was permitted and now serves as an injection well.

Since this redesigned waterflood was implemented, approximately 120,000 barrels of oil and 1.6 million barrels of water have been produced from an approximately 200 acre well pattern. 1.4 million barrels of produced water have been injected into the single vertical injection well and 400,000 barrels of produced and make-up water were injected into the horizontal injection well, which is no longer in service. The current production rate is 145 BOPD and 1700 BWPD.

 

 

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