Boring or penetrating the earth – Processes
Reexamination Certificate
2005-02-15
2005-02-15
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Processes
C175S213000, C175S215000, C175S320000
Reexamination Certificate
active
06854534
ABSTRACT:
Method and apparatus for drilling a well bore 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 therebetween. A drilling device comprising a reciprocation air hammer and a dull bit, a positive displacement motor and a reverse circulating drill bit, or a reverse circulating mud motor and a rotary drill bit, is provided at the lower end of the concentric coiled tubing drill string. Drilling medium is delivered through the annulus or inner coiled tubing string for operating the drilling device to form a borehole. Exhaust drilling medium comprising drilling medium, drilling cuttings and hydrocarbons is removed from the well bore by extraction through the other of the annulus or inner coiled tubing string.
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