When stimulating gas reservoirs, care must be taken to select a fracture fluid that limits damage and preserves the quality of the reservoir. Increased water saturation in the fracture leak-off area is the primary damage mechanism when fracturing gas wells, and this reduces the reservoir’s relative permeability to gas. Energized frac fluids are used to enhance clean-up and to maintain the gas saturation in the leak-off area (i.e. prevent fluid retention). Nitrified foam used as a frac fluid minimizes the amount of liquid placed in the formation and enables rapid cleanup in low pressure reservoirs. With CO₂ frac fluids, Trican’s experience indicates CO₂ Crosslinked Water is an effective and economical stimulation fluid for many gas reservoirs, but when fluid retention is a problem, Emulsified CO₂ (foam) offers the best results.

Trican has designed and built a significantly improved blender used for 100% Liquid Carbon Dioxide fracturing. This fracturing technique is an excellent formation evaluation tool when formation damage due to fluid retention is suspected. Trican’s CO₂ Blender has fewer tank bottoms than conventional CO₂ blenders and can run separately for small jobs since it has the capability of hauling sand to location. Savings are realized on sand transport and CO₂, which can be passed on to our customers.

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