Calculate the critical gas velocity and critical gas production rate for wells and perforations
Usage and Configuration
To perform the calculations run the workflows from this package. The schedules may be adapted to use different contexts.
Follow the steps given in How do I configure packages pulled from Datagration's package repository to change the configuration of the package.
This package contains separate workflows for calculating the outputs on well and sub-well level. Depending on the specific needs, only the required workflows can be scheduled.
Details
Workflow Critical Gas Velocity And Rate (Well-Level)
This workflow calculates the critical gas velocity and critical gas rate on well level. The method used to calculate the critical gas rate depends on the well head pressure. For tubing head pressures smaller than 1000 psi, the Coleman equation is used, otherwise the Turner equation is used.
Workflow Critical Gas Velocity And Rate (Sub-Well-Level)
This workflow calculates the critical gas velocity and critical gas rate on sub-well (i.e. perforation) level. The method used to calculate the critical gas rate depends on the well head pressure. For tubing head pressures smaller than 1000 psi, the Coleman equation is used, otherwise the Turner equation is used. Signals stored on well level (e.g. well head pressure and well head temperature) are taken from the respective well.
The hierarchy used for retrieving values from the parent can be configured using the workspace value HierarchyWellPerforationRelationships.
Data Requirements
The following data is required:
well head pressure
well head temperature
gas compressibility factor¹
gas specific gravity²
interfacial tension water²
gas density¹
produced oil per time increment
produced condensate per time increment
produced water per time increment
produced liquid per time increment
oil density¹
condensate density¹
water density¹ ²
liquid density¹ ²
tubing inner diameter
¹ PVT data
² If no data is available, literature values stored as workspace values will be used.
References
- James Lea, Henry Nickens, Michael Wells,
Chapter 3 - Critical Velocity,
Editor(s): James Lea, Henry Nickens, Michael Wells,
Gas Well Deliquification,
Gulf Professional Publishing,
2003,
Pages 27-41,
ISBN 9780750677240,
https://doi.org/10.1016/B978-075067724-0/50003-X.