Selective control of charging, firing, amount of force, and/or direction of force of one or more downhole jars

A method of freeing stuck components of a drill string in a subterranean borehole, the method comprising:

• drilling a borehole using the drill string, the drill string comprising a plurality of spaced apart jars and a plurality of wired drill pipe sections, the drill pipe section and jars each comprising electromagnetic components allowing communication at least between the jars and a surface command device;
• communicating between the surface command device and the communication components in two or more of the jars;
• and
• selectively controlling at least one of charging, firing, amount of force, and direction of force, of two or more of the jars via the surface command device.

A method of jarring comprising:

• communicating between a surface command device and communication components in one or more jars of a drill string, the drill string comprising a plurality of spaced apart jars positioned in a corresponding plurality of wired pipe sections;
• digitally selectively controlling at least one of charging, firing, amount of force, and direction of force, of one or more of the jars with the surface command device;
• firing a sub-set or all of the jars in a digitally controlled manner and determining depth of a stuck drill string section through analysis of behavior or performance of the fired jars;
• and
• subsequently digitally selectively controlling firing one or more of the jars below the stuck drill string section via the surface command device.

A method of jarring comprising:

• electromagnetically communicating between a surface command device and electromagnetic communication components in one or more jars of a drill string, the drill string comprising a plurality of spaced apart jars positioned in a corresponding plurality of wired pipe sections;
• and
• selectively controlling at least one of charging, firing, amount of force, and direction of force, of two or more of the jars using the surface command device;
• wherein the electromagnetically communicating is selected from the group consisting of
• i) sending a wireless electromagnetic signal from the surface command device to two or more of the jars, or from two or more jars to the surface command device,
• ii) sending an electromagnetic signal through wired connections from the surface command device to two or more of the jars, or from two or more of the jars to the surface command device, and
• iii) combinations thereof.