Transcript The Hall Plot Method - Advantek International

Review:
The Hall Plot Method
Update, April 2000
The Hall Plot Document (Rev. 0)
• Review of the first version - an update
(Rev. 1) will be soon on the web page
• Contents:
– The Hall plot theory
– Practical applications of the Hall plot method
– Early detection of slope changes
– Also: The role of Hall plot and other
continuous monitoring techniques in the
overall well monitoring strategy
The Hall Plot Method
• Description of the basic theory
• Practical aspects: examples of
applications to real field data
• Advantages versus disadvantages
• Limitations and potential pitfalls, such as
the importance of:
– reservoir pressure and
– correct bottom hole pressure correlation
The Hall Plot Method
• Cumulative time - pressure multiple
versus cumulative injection fluid volume
r
141.2   w  Bw   ln e  S 
rw

 W




P

P


t

t bhi e
i
k w  hi
• Theoretically, the (modified) Hall slope
has a quantitative meaning (RII) but
practically it has qualitative meaning
r
141.2   w  Bw   ln e  S 
rw


mH 
k w  hi
The Hall Plot Method
• The core behind the Hall plot method is that
it takes readily available data, and
minimises fluctuations due to “noise”
• The Hall plot technique is best known for
well history overview
• Also possible to use for more specific
analysis, given that constraints are taken
into account, such as steady state etc.
– Early detection of slow gradual changes in
slope (e.g. plugging, or flow geometry changes)
Continuous Injection Monitoring
• These method include:
– Pressure and rate versus time
– Injectivity and reciprocal injectivity indices
– Hall plots, etc.
• Analysis of readily available data (pressure
and rate) can give a strong early indication
of changes in the injection behaviour
• However, this analysis of often not exclusive
and to explain certain behaviour, specific
tests need to be performed
Continuous Injection Monitoring
and Well Monitoring Strategy
• Guidelines and best practices needed