Advanced Artificial Lift Methods

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• Advanced Artificial Lift Methods PE 571
• Introduction

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Review
Pressure Drop in a Production System
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Single Phase Liquid IPR and OPR
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Single Phase Liquid IPR and OPR

• The flowrate value at which a specific well flows
  for a set of operational conditions using only
  the energy stored in the compressed reservoir
  fluids is called natural equilibrium flowrate

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Review
Single Phase Liquid IPR and OPR
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Single Phase Liquid IPR and OPR
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Review
Single Phase Liquid IPR and OPR
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Single Phase Liquid IPR and OPR
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Darcys Law - IPR
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Darcys Law - IPR
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IPR Vogel and Fetkovich
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IPR Vogel and Fetkovich
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Future IPR
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OPR
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OPR
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OPR
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IPR vs. OPR
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Stability

• Stable equilibrium small disturbance around the
  equilibrium point, the system will move back to
  the equilibrium condition.
• Unstable equilibrium If the disturbance is large
  enough, the system will move towards another
  equilibrium point or loose the equilibrium
  permanently

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Stability

• Fluctuations on the Pwh, qsystem lt qsteady state

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Stability
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Stability
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Stability
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Stability
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Stability
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Stability
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Stability
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Stability
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Stability

• Several techniques might be used when the system
  reaches to the unstable point such as
• If the well has an artificial lift installed
  it can be put into production to help the well
  overcome the unstable point. After that if the
  artificial lift is not required we can leave the
  well under natural flow.
• If the well does not have an artificial lift
  installed, we can do several things Agitation,
  swab, gas injection, nitrogen injection

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Stability Tubing Heading

• High reservoir pressure
• Small PI
• Big tubing string

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Stability Tubing Heading
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Stability Tubing Heading
If the fluctuations are small then the well will
produce a steady state flowrate. If the
fluctuations are large, the production in this
well will cycle with time. This is called the
tubing heading. Tubing heading is characterized
by pulsating well head pressure (EX caused by
slug flow) and constant casing pressure. It
occurs mostly in wells fitted with a packer
during the final stage of life. During this
period, liquid is lifted through a portion of the
tubing and then falls back resulting a cycle
flow. Under these conditions, the production
test data from this well are very difficult to
match the IPR and OPR simulations.
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Review
Stability Tubing Heading

• Very high PI
• Big tubing string

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Stability
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Stability Casing Heading