E21C37/06 - CPC Classification

Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole

• E21C37/08 » Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole 3
• E21C37/10 » Devices with expanding elastic casings 6
• E21C37/12 » by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid 16
• E21C37/14 » by compressed air; by gas blast; by gasifying liquids 11

Recent Application in this class: