4. Boring or penetrating the earth
  5. Boring with explosion in inaccessible hole
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High density jet perforating casing gun

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With position orienting or indicating
Patent

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High density perforating gun system

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

High speed electromagnetically accelerated earth drill

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Firing control mechanically actuated in bore
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

High temperature selective fire perforating gun and switch there

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Independent firing of plural charges
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

High-energy combined well perforating device

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Reexamination Certificate

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High-velocity jet and propellant fracture device for gas and oil

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent

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Horizontal drilling method and apparatus

Boring or penetrating the earth – Boring with explosion in inaccessible hole
Reexamination Certificate

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Hydraulic safety pin and method of operating a pressure-controll

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With bore condition firing control – or compensating means
Patent

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Hydraulically damped detonator for use in perforating oil well t

Boring or penetrating the earth – Boring with explosion in inaccessible hole – With wall engaging packer or anchor
Patent

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