Coalbed Methane (CBM) formations are found throughout many parts of the
Western Canadian Sedimentary Basin and the world. Some coal zones are dry and produce
little to no water, while others produce large volumes of water from the coal prior
to producing gas. Trican has experience in fracturing both types of coal reservoirs.
Trican’s CBM fracturing services consist of high-rate nitrogen pumpers and
bulk N2 equipment designed to stimulate dry CBM wells. CBM fracturing
involves pumping gaseous nitrogen into a coal zone at very high rates (500 to 4500
scm/min [17,650 to 160,000 scf/min]). This causes the nitrogen to fracture the coal,
thereby allowing the methane to flow into the well. Nitrogen is inert and does not
damage the formation.
Dry CBM wells normally contain a number of small coal layers. In order to optimize
gas production, each of these layers must be fractured independently of one another.
For this reason, Trican utilizes coiled tubing with an isolation tool on the bottom
to isolate and fracture each small coal seam. In many wells, up to 25 fracs are
completed using this coiled tubing fracturing technology.