Abstract: A method and apparatus for perforating tubular members coaxial outside and inside surfaces with a continuous wall extending therebetween attaches at least one explosive charge in direct contact with the wall of the tubular with at least one detonation device in communication with the explosive device. A control station in wireless and cableless communication with the at least one detonation device selects from radio waves, infrared waves, acoustic waves, optical light waves, seismic waves, and combinations thereof to activate the at least one detonation device.

Abstract: A method and apparatus for perforating tubular members coaxial outside and inside surfaces with a continuous wall extending therebetween attaches at least one explosive charge in direct contact with the wall of the tubular with at least one detonation device in communication with the explosive device. A control station in wireless and cableless communication with the at least one detonation device selects from radio waves, infrared waves, acoustic waves, optical light waves, seismic waves, and combinations thereof to activate the at least one detonation device.

Abstract: A method and apparatus for detonating explosive charges wherein at least one explosive charge is in contact with the outside surface of a wall with a detonation device in communication with each explosive device. The detonation device includes a programmable logic interface to arm and fire the detonation device in response to receipt of a coded signal from a control station in wireless and cableless communication with the programmable logic interface.

Abstract: A method and apparatus for wireless and cableless communication between a control station and a remote unit downhole uses the tubular of the well as a waveguide. The downhole portion includes a receiver, a programmable logic interface and means responsive to receipt of a control signal for initiating an action, such as detonation of at least one explosive charge.

Abstract: The present invention is a charge amplifier that directly produces a low impedance voltage output proportional to the charge at its input. The invention consists of an operational amplifier, an input capacitor, a feedback capacitor and a feedback resistor in a parallel configuration. The change amplifier of the present invention can be said to be a differentiator followed by an integrator so that the "noisy" differentiation process precedes the integration and, thus the integration produces less signal degradation.