Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2006-06-27
2006-06-27
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S062000, C175S215000
Reexamination Certificate
active
07066283
ABSTRACT:
Method and apparatus for drilling a directional or horizontal wellbore in a hydrocarbon formation using concentric coiled tubing drill string having an inner coiled tubing string and an outer coiled tubing string defining an annulus there between. A bottomhole assembly comprising a directional drilling means is provided at the lower end of the concentric coiled tubing drill string for reverse circulation drilling. Directional drilling means comprises a reciprocating air hammer and a drill bit, a positive displacement motor and a reverse circulating drill bit, or a reverse circulating mud motor and a rotary drill bit, and a bent sub or housing. Drilling medium is delivered through the annulus or inner coiled tubing string for operating the directional drilling means to form the directional or horizontal wellbore. Exhaust drilling medium comprising drilling medium, drilling cuttings and hydrocarbons are removed from the wellbore by extraction through the other of the annulus or inner coiled tubing string.
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Bennett Jones LLP
PresssoL Ltd.
Thompson Kenneth
LandOfFree
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