Summary
Husky Energy's Pikes Peak steam project has been highly successful using CSS
and follow-up steam drive for vertical and directional wells located on the
bottomwater-free structural high inside the oil/water contact of the Waseca
channel sand reservoir(1). In some areas, recoveries of up to 90%
have been achieved with a cumulative steam/oil ratio (SOR) of less than
3.0.
Use of CSS with follow-up drive has not been successful where bottomwater is
present outside the oil/water contact. Some improvement in performance was
achieved using large CSS slugs and high-steam injection rates, but in some
locations CSS performances were still poor and conversion from CSS to drive has
not been successful in any location.
In 2008 Husky initiated a field test of a single vertical well SAGD
configuration in an area outside the oil/water contact to evaluate an alternate
process in which the "conventional" CSS performance of 10 wells was poor from
the second or third stimulation onward. The results from the first single
vertical SAGD well pilot demonstrated that a single vertical well SAGD
configuration could be successfully completed and operated.
The field data are being evaluated using empirical and numerical modelling
methods to develop completion and operating strategies that optimize future
produced oil rates and SORs.
Another benefit of the field test was its demonstration of a low-cost and
rapid method to help determine if a reservoir has sufficient vertical
permeability for horizontal well SAGD to work.
© 2010. Society of Petroleum Engineers
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History
- Original manuscript received:
21 July 2009
- Meeting paper published:
17 June 2009
- Revised manuscript received:
17 August 2010
- Manuscript approved:
19 August 2010
- Published online:
1 November 2010
- Version of record:
1 November 2010
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