Commingled Production

Use Case Name

Commingled Recompletion 


November 2015


CWIS Work Group



Support the business case for the CWIS Standard by showing how to capture data for a complex well completion

Summary Description

All data for a wellbore completion are captured according to depth interval and time interval within a wellbore and tagged with the CWIS identifiers.


Primary: Alberta Energy Regulator (AER), well operator
Secondary: data vendor, data analyst


Question about how to use the CWIS identifiers for a commingled completion. This is intended to support the business case for adopting the CWIS Standard.


  • Regulations and practices currently in effect in Alberta concerning well data reporting and UWI assignment.
  • Assumptions about the use of CWIS identifiers if adopted.
  • The well was licensed with UWI 100081002115W400.


Primary or Typical Scenario

A vertical well was drilled to total depth in 2003 and tested in several zones. Two zones were abandoned; the third was placed on production. In 2010 several additional higher zones were opened and merged with the existing production as a commingled completion. The actual (simplified) sequence of activity was:
Year 2003

  • Drill the vertical wellbore to total depth.
  • Feb 23 – Mar 6. Perf and test first Mannville zone
  • Mar 7. Set bridge plug 1040 m to abandon first zone
  • Mar 9 – Apr 1. Perf and test second Mannville zone
  • Apr 12. Frac and test second zone
  • Apr 25. Set bridge plug 990 m to abandon second zone
  • Apr 25 – May 21. Perf and test Viking zone
  • May 29 – July 7. Frac and test Viking zone
  • July 7. On production Viking gas

Year 2010

  • Feb 2 – Feb 10. Suspend production. Perf and test upper zones
  • Feb 11 – Feb 24. Frac and test upper zones
  • Feb 24. Commingled completion, all zones Viking to Milk River.
  • Feb 24. On production (gas).

Alternative Scenarios

Using the existing UWI system for well identification, 4 UWI events are used to capture the drilling and completion data for the various zones:

  • The lower zones (abandoned) are reported on Event 0
  • Completion and production 2003 – 2010 (Viking) are reported on Event 2
  • 2010 test recovery and commingled production are reported on Event 3
  • Completion and testing of the upper zones is reported on Event 4.


This Use Case assumes that the regulator has adopted the CWIS System. It also assumes some details of the processes used by AER and Petrinex although reality might be different. The identifiers (fictional examples) would be assigned as follows:

  • Well ID AB0094222 is published on the drilling licence.
  • Wellbore ID AB0094222B001 is assigned in anticipation of the first wellbore and published on the drilling licence.
  • AER assigns a UWI to support compatibility with legacy systems.
  • The operator reports drilling data via the AER Digital Data Submission System (DDS) in compliance with Directive 059.
  • Well logs, tour sheets, casing reports, etc. all have AB0094222 and Wellbore ID AB0094222B001.
  • AER assigns the wellbore data to Wellbore ID AB0094222B001.
  • The operator reports all the completion data via DDS, using Wellbore ID AB0094222B001. The various perforated intervals and test results are differentiated by depth and time.
  • Effective July 7, the operator reports the well status change to gas producer via Petrinex and links the production to the completion in AB0094222B001.
  • Petrinex assigns Well Reporting ID AB0094222V001 and a UWI.
  • The operator reports monthly production via Petrinex using AB0094222V001 or the UWI (operator’s choice).
  • In 2010, the operator reports the status change to suspended for AB0094222V001
  • In 2010, the operator reports the new completion activity to Wellbore ID AB0094222B001
  • In 2010, Petrinex assigns Well Reporting ID AB0094222V002 for the commingled production. It also assigns a new UWI event.
  • In 2010, the operator reports the status as commingled gas producer for AB0094222V002. Fluid recovered on test is also reported to this Well Reporting ID.
  • The operator reports monthly production via Petrinex using AB0094222V002 or the UWI (operator’s choice).

Business Rules


The following standards and regulatory procedures are assumed for the scenario:

  • CWIS Standard for well identifiers
  • Regulations and procedures of the AER for reporting drilling and completion information (Directive 059) and for reporting production, adapted with assumptions of how Directive 059 would apply if using CWIS.
  • UWI assignment procedure in current use by the AER and Petrinex



This case is based on well licence 0281188.



  • What Is A Well? defines “Well”, “Wellbore” etc.
  • UWI as defined and assigned by the regulator (AER) and used by Petrinex.
  • Well ID, Wellbore ID, Well Reporting ID as defined by the CWIS standard.