Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Reexamination Certificate
2006-09-19
2006-09-19
Bates, Zakiya W. (Department: 3676)
Boring or penetrating the earth
Boring without earth removal
Fluid passage to exterior of drive point
C175S038000, C175S072000, C175S234000, C175S318000, C175S324000
Reexamination Certificate
active
07108080
ABSTRACT:
A method for drilling a borehole includes; providing a drill string of drill pipe including a center bore, a distal end, a bit assembly at the distal end; hanging a liner from the drill string, thereby forming an annular space between the drill string and the liner and with the bit assembly extending from a lower end of the liner; positioning the drill string with the liner attached thereto in a borehole such that a second annular space is formed between the liner and the borehole wall; operating the bit assembly to proceed with drilling the borehole; and circulating drilling fluid down through the center bore of the drill string out through the bit assembly and down through the second annular space between the liner and the borehole wall, the drilling fluid returning up through the annular space between the drill string and the liner.
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Houtchens Bruce D.
Tessari Robert M.
Bates Zakiya W.
Cahoon Colin P.
Carstens & Cahoon LLP
Tesco Corporation
Wang William S.
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