advanced artificial lift methods – pe 571 introduction
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Advanced Artificial Lift Methods – PE 571 Introduction. Review. Pressure Drop in a Production System. Review. Single Phase Liquid IPR and OPR. Review. Single Phase Liquid IPR and OPR. - PowerPoint PPT PresentationTRANSCRIPT
Advanced Artificial Lift Methods
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Advanced Artificial Lift Methods – PE 571
Introduction
Advanced Artificial Lift Methods
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ReviewPressure Drop in a Production System
Advanced Artificial Lift Methods
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ReviewSingle Phase Liquid IPR and OPR
Advanced Artificial Lift Methods
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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”
ReviewSingle Phase Liquid IPR and OPR
Advanced Artificial Lift Methods
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ReviewSingle Phase Liquid IPR and OPR
Advanced Artificial Lift Methods
Prepared by Dr. Nguyen
ReviewSingle Phase Liquid IPR and OPR
Advanced Artificial Lift Methods
Prepared by Dr. Nguyen
ReviewSingle Phase Liquid IPR and OPR
Advanced Artificial Lift Methods
Prepared by Dr. Nguyen
ReviewSingle Phase Liquid IPR and OPR
Advanced Artificial Lift Methods
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ReviewIPR – Vogel and Fetkovich
Advanced Artificial Lift Methods
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ReviewIPR – Vogel and Fetkovich
Advanced Artificial Lift Methods
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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
ReviewStability
Advanced Artificial Lift Methods
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Fluctuations on the Pwh,
qsystem < qsteady state
ReviewStability
Advanced Artificial Lift Methods
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ReviewStability
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 …
Advanced Artificial Lift Methods
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ReviewStability – Tubing Heading
• High reservoir pressure
• Small PI
• Big tubing string
Advanced Artificial Lift Methods
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ReviewStability – Tubing Heading
Advanced Artificial Lift Methods
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ReviewStability – 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.
Advanced Artificial Lift Methods
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ReviewStability – Tubing Heading
• Very high PI
• Big tubing string
Advanced Artificial Lift Methods
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ReviewStability – Casing Heading