Cement Pulsation for Prevention of Gas Migration (gas migration control)
In many resource producing regions, surface casing vent flows and gas migration are common occurrences and can be very expensive to repair. Trican’s Cement Pulsation process is a relatively new system that is proving to be very effective in eliminating such problems.* This Cement Pulsation process is a patented technology licensed exclusively to Trican in Canada and is available in all areas where Trican operates.
Cement slurries begin to develop gel strength as they approach their thickening times, after being placed in the annulus. As this gel strength continues to develop, the cement column begins to support itself. When the formation pressure (gas) exceeds the hydrostatic pressure of the cement column at any point along the wellbore, the gas will enter the slurry, causing a channel, which can extend all the way to the surface.
Cement pulsation applies small, low-pressure pulses to break any gel strength that has developed and maintains the cement in liquid form until it reaches its thickening time. Once this happens, it sets up almost immediately, allowing the cement column to maintain hydrostatic pressure on the wellbore for as long as possible. Pulsation can only be applied when using conventional cement blends. Thixotropic blends cannot be used with the pulsation unit.
* This technology has resulted in a 96% success rate in the prevention of gas migration in Eastern Alberta.
Trican AccuLiteTM Cements AquaPlugTM (lost circulation control) Trican ASCTM (acid soluble cement blend) Cement Simulator (process) Trican LCPTM (lost circulation control) Optimum FlushTM (preflush) TDF-3TM (fluid loss additive) TDH-2TM (delayed hydration additive) Titanium Lightweight Cements (blends) TLATM (Trican Latex Additive) TWR-3TM (free water control additive) CFL-7TM (fluid loss additive) LCFTM (lost circulation fibre)
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