| 摘要 |
A shock tool is adapted to a bottom hole tool assembly for isolating a zone in a subterranean formation accessed by a wellbore. Fracturing fluid su ch as nitrogen is accumulated at fracturing pressures uphole of the shock tool for subsequent and rapid release to the formation. Coal bed methane seams are particularly well suited to such a shock fracturing methodology. The tool assembly can be suspended from a conveyance string in which fluid is accumulated for shock release through a valve of the shock tool and through an injection tool to t he zone isolated by the injection tool. After a first zone is shocked, the tool assembly can be moved to a new zone, or multiple shocks can be applied cyclically at the selected zone.
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