Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Normally curved guide or shaft
Reexamination Certificate
2007-02-20
2007-02-20
Tsay, Frank S. (Department: 3672)
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Normally curved guide or shaft
C175S107000
Reexamination Certificate
active
10811118
ABSTRACT:
According to one embodiment of the invention, a system for directional drilling within a wellbore includes a drill string having an upper portion, a lower portion, a bent motor coupled to the lower portion, and a drill bit coupled to bent motor, and a clutch assembly disposed between the upper and lower portions. The clutch assembly is operable to disengage the upper and lower portions of the drill string and allow the upper portion to rotate while the lower portion does not rotate.
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Notification of Transmittal of the International Search Report and the Written Opinion of the Internationl Searching Authority, or the Declaration (3 pages), International Search Report (4 pages), and Written Opinion of the International Searching Authority (5 pages) for International Application No. PCT/US2005/008774 mailed Jun. 10, 2005.
Maidla, E., et al., “Understanding Torque: The Key to Slide-Drilling Directional Wells,” IADC/SPE 87162, Society of Petroleum Engineers, 7 pages, Mar. 2-4, 2004.
Notification Concerning Transmittal of Copy of Internatinal Preliminary Report on Patentability (1 page), International Preliminary Report on Patentability (1 page), and Written Opinion of the International Searching Authority (5 pages) for International Application No. PCT/US2005/008774 mailed Oct. 5, 2006.
CDX Gas, LLC
Fish & Richardson P.C.
Tsay Frank S.
LandOfFree
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