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Wyoming Water Development Commission 
Harry C. LaBonde, Jr., PE, Director 
6920 Yellowtail Rd, Cheyenne, WY 82002 
Phone: 307-777-7626 

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Active Projects

 23. PROJECT:CBM Aquifer Storage and Retrieval
SPONSOR:City of Gillette, Incorporated Municipality
LOCATION:Campbell County
PROGRAM:New Development
Purpose Chapter Session Account Appropriation Due Date
Level II 7 2002 I $510,000 2004

This project consists of a study to test the feasibility of re-injecting and retrieving coal bed methane (CBM) water into the Fort Union aquifer. This would involve a pilot well to evaluate the subsurface geology to determine its ability to store CBM discharge water. If data indicates that storage/retrieval is feasible, then the well would be completed as an observation well. A second production/storage well and another observation well would then be completed.

Several CBM producers are currently injecting CBM water as a means of disposal of excess produced water (DEQ currently has over 240 re-injection permits issued). Determining whether storage of this water and later retrieval is cost effective is one purpose of the project.

Gillette had predicted a large increase in its population due to the recent CBM boom. Storage of water in aquifers that are already experiencing drawdown would help Gillette in serving the needs of their growing population.

To prevent contamination of the aquifer, prior to injection, CBM water would be disinfected with a small disinfection facility built at the site. Water samples will be monitored for conductivity, pH, chlorine and sulfates. Other assurances are needed as well to insure that wellfield treatment chemicals are not introduced into the aquifer in toxic quantities.

No legislative action required.

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