Reporting Multileg Production

Use Case Name

Reporting Multileg Production


November 2015


CWIS Work Group



Support the business case for the CWIS Standard by showing how to capture production data for a single completion in multiple wellbores.

Summary Description

All data for a wellbore completion are captured according to depth interval and time interval within a wellbore. Production is reported on the Well Reporting ID.


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


Question about how to use the CWIS identifiers for multileg completion data. This shows the advantage of the Well Reporting ID.


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


Primary or Typical Scenario

A well (Figure 1) was drilled with three horizontal wellbores in the Viking SS and completed for a single stream of gas production.

The actual sequence of activity was:

  • Drill the first wellbore (B1 on the figure) to 1479 m measured depth.
  • Set intermediate casing at 1442 m near the heel of the horizontal section.
  • Kick off and drill a second horizontal leg (B2) to 2425 m MD.
  • Kick off and drill a third horizontal leg (B3) to 1970 m MD.
  • Set bridge plug and release the drilling rig July 16.
  • Service rig pull bridge plug July 30.
  • Static gradient pressure test Aug 1.
  • Open hole completion: all 3 wellbores (no stim or treatment) using production tubing in the intermediate casing.
  • Well on flowing gas production Aug 18.
  • Drilling and completion data reported to the regulator via DDS System.
  • Workover 7 years later: replace tubing to optimize production.

Alternative Scenarios

Using the existing UWI system for well identification, three UWIs are assigned. The production is reported only on the first UWI. The other two have status of DRAIN.


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 would be assigned as follows:

  • Well ID AB0094533 is published on the drilling licence.
  • Wellbore ID AB0094533B001 is assigned in anticipation of first wellbore.
  • Well logs, tour sheets, casing reports, etc. all have AB0094533
  • The operator reports drilling data for the first wellbore via the AER Digital Data Submission System (DDS) in compliance with Directive 059.
  • AER assigns the wellbore data to AB0094533B001 and UWI 1020106…/00.
  • The operator reports drilling data for the second wellbore via the DDS.
  • AER assigns the wellbore data to Wellbore ID AB0094533B002 and creates UWI 1001431…/02.
  •  The operator reports drilling data for the third wellbore via the DDS.
  • AER assigns the wellbore data to AB0094533B003 and UWI 1000706…/03.
  • The operator reports the completion data via DDS, using Well ID AB0094533. This case has a simple open hole completion with no treatment or equipment below the intermediate casing.
  • The operator reports the well status change to gas producer via Petrinex; this includes linking the production to all 3 Wellbore IDs.
  • Petrinex assigns Well Reporting ID AB0094533V001.
  • Petrinex links the 3 Wellbore IDs to the Well Reporting ID.
  • If Petrinex continues the current practice of completion event UWIs, these 3 events correspond to the 3 drilling events (ending 0, 2, 3 respectively). The status of completion event 0 is “Flowing Gas”, the other two are “Drain”. Production is reported on event 0 only.
  • The operator reports monthly production and status using AB0094533V001 or the appropriate 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


This is based on a real example with data from the operator. Licence 0xxx263.



  • 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.