SPE Reservoir Evaluation & Engineering
Volume 14,
Number 1,
February 2011,
pp. 113-119
Summary
This study expands upon the use of modified-Hall analysis (MHA) to discern
the characteristics of a high-permeability channel. Briefly, the modified-Hall
plot uses three curves involving improved Hall-integral (H-I) and the two
derivatives, analytic and numeric. Ordinarily, the derivative curves overlay on
the integral curve during matrix injection, but separates lower when fracturing
occurs. This work presents a method to identify and characterize
high-conductive layers or channels between injector and producer pairs with the
MHA. The distance separating the integral and derivative curves provides the
required information to quantify channel properties. A simple analytical
solution is presented for transforming the separation distance into channel
permeability-thickness product.
The analytic derivative is based on the radial-flow-pattern assumption and the
numeric derivative is correlated to the pressure response. Therefore, a
comparison of these two curves reveals clues about the maturity of a waterflood
at a given time. Several simulated examples verified the
channel-property-estimation algorithm and identified the distinctive derivative
signatures for channeling and fracturing situations. This method is also useful
for identification of wormhole propagation during sand production in
unconsolidated formations.
© 2010. Society of Petroleum Engineers
View full textPDF
(
778 KB
)
History
- Original manuscript received:
25 August 2009
- Meeting paper published:
4 October 2009
- Revised manuscript received:
15 March 2010
- Manuscript approved:
7 June 2010
- Published online:
20 December 2010
- Version of record:
21 February 2011
View Cart
