Boring or penetrating the earth – With means movable relative to tool or shaft to control... – Valve prevents upward flow
Reexamination Certificate
2007-04-17
2007-04-17
Gay, Jennifer H. (Department: 3672)
Boring or penetrating the earth
With means movable relative to tool or shaft to control...
Valve prevents upward flow
C175S324000
Reexamination Certificate
active
10644748
ABSTRACT:
Method and apparatus for drilling a directional or horizontal wellbore in a hydrocarbon formation using concentric drill string having an inner pipe and an outer pipe defining an annulus there between. A bottomhole assembly comprising a directional drilling means such as an air hammer or a rotary drill bit and driving system is provide at the lower end of the concentric drill string and drilling medium is delivered through the annulus or inner pipe for operating the directional drilling means to form a borehole. Exhaust drilling medium, drilling cutting and hydrocarbon are removed from the wellbore by extracting the exhaust drilling medium, drilling cutting and hydrocarbon through the other of the annulus or inner pipe.
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Bennett Jones LLP
Gay Jennifer H.
Presssol Ltd.
Stephenson Daniel P
LandOfFree
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