ERCB (now AER) Bulletin 2012 02 Hydraulic Fracturing: Interwellbore Communication between Energy Wells no longer available at the regulator’s website (for obvious reasons).
Uploaded here: https://www.ernstversusencana.ca/wp-content/uploads/2012-01-23-ERCB-Bulletin-2012-02-Hydraulic-Fracturing-Inerwellbore-Communication-ERCB-warning-but-8-yrs-earlier-did-not-warn-about-Encana-fracing-drinking-water-aquifers.pdf
ERCB Bulletin 2012-02: Hydraulic Fracturing: Interwellbore Communication between Energy Wells by Robin King, Executive Manager, January 23, 2012
The Energy Resources Conservation Board (ERCB) is aware that communication between a wellbore being stimulated and an offset energy wellbore that penetrates the same formation can and has occurred. Offset wellbores include wells that are being drilled or stimulated or those that are producing, suspended, or abandoned.
The ERCB fully expects licensees to maintain well control at all times so as not to impact the environment, public safety, and efficient recovery of the resource and to prevent adverse effects to offset energy wellbores.
The ERCB reminds industry that it is obligated to plan safe and effective hydraulic fracturing operations and report any unintentional communication between energy wellbores.…The ERCB continues to monitor and assess the risk of these communication events….
Refer also to:
2012 01 232: ERCB Appendix A: Interwellbore Communication During Fracturing Operation Events
Surface distance between wells: 1.2 kilometres
Subsurface distance between wells: Under investigation…
Surface distance between wells: Approximately 1,500 metres
Subsurface distance between wells: 110 metres…
Surface distance between wells: Approximately 530 metres
Subsurface distance between wells: 475 metres…
Surface distance between wells: Approximately 1,600 metres
Subsurface distance between wells: 190 metres…