Apparatus and methods for jarring

A jarring tool for recovering a well bore object having a telemetry system, comprising:

• an anvil, said anvil being connected to the portion of the object that is lodged in the well bore;
• a hammer positioned adjacent said anvil, said hammer adapted to provide an impact force to said anvil when propelled by a propelling force;
• a housing enclosing at least a portion of said hammer and said anvil, said housing having a first section releasably connected to a second section, said first section being adapted to actuate said hammer when disconnected from said second section;
• and
• a telemetry link in communication with the telemetry system of the well bore object, said link having at least two members arranged in a telescoping fashion, said link being adapted to transmit electrical signals across said housing.

A method of freeing an object stuck in a well bore, comprising

• connecting an anvil to the object;
• generating a propelling force;
• applying the propelling force to a hammer;
• restraining the hammer such that the hammer is substantially stationary relative to the anvil while the propelling force is applied to the hammer;
• and
• releasing the hammer.