Schlumberger

ThorFRAC Extreme Overbalance CT Stimulation System

Shock coalbed methane formations—produce longer, cleaner perforations without damaging coal

The ThorFRAC extreme overbalance CT stimulation system is a way of shocking coalbed methane formations to produce longer, cleaner perforations without damaging the coal. This novel method minimizes both the cleat damage that can lead to fluid recovery problems and the complex fracture behavior that can cause excessive near-wellbore pressure.

The ThorFRAC system combines coiled tubing and fracturing technology using specially designed bottomhole assemblies. Similar to the conventional approach, a CT string and straddle tool are used to isolate separate perforation intervals. The tool has a multiset release valve built in to allow nitrogen pressure to be stored in the CT string.

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