Process for seismic exploration by means of a directive source

Production logging mechanism for across-the-borehole measurement

Projectile powered piston

Pulse generator powered vibrator

Pulsed high pressure liquid propellant combustion powered seismi

Rapid fire air gun

Receiver array using tubing conveyed packer elements

Recoil reducing system for gas guns

Regenerative combustion device

Removable piston bore liner for hydraulically actuated seismic v

Repetitive detonation seismic surveying method and apparatus

Reversible rigid coupling apparatus and method for borehole seis

Rotary air modulator

Rotary seismic shear-wave source

Rotatable horizontal vibrator

Rotating eccentric weight apparatus and method for generating co

Rotating eccentric weight seismic sources and a seismic explorat

Sea water hydraulic fluid system for an underground vibrator

Seafloor velocity and amplitude measurement apparatus method

Seismic apparatus