Review: The Hall Plot Method

1
ReviewThe Hall Plot Method

• Update, April 2000

2
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

3
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

4
The Hall Plot Method

• Cumulative time - pressure multiple versus
  cumulative injection fluid volume

• Theoretically, the (modified) Hall slope has a
  quantitative meaning (RII) but practically it has
  qualitative meaning

5
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)

6
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

7
Continuous Injection Monitoringand Well
Monitoring Strategy

• Guidelines and best practices needed