Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by fluid pressure
Reexamination Certificate
2005-02-08
2005-02-08
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by fluid pressure
C175S284000, C166S381000
Reexamination Certificate
active
06851491
ABSTRACT:
The present invention generally relates to downhole tools. More particularly, the invention relates to a locking mechanism for use on a downhole tool. A flow actuated locking mechanism is provided for a downhole tool that includes an annular, two-position sleeve having an unlocked position and a locked position. A pin assembly within the tool is used to retain the sleeve in the locked position. In one aspect of the invention, the locking mechanism is used on a reaming tool with extendable cutters that are extendable from the body of the tool to increase the diameter of the tool and aid in forming a wellbore therearound. The locking mechanism prevents the cutters from collapsing or closing as the reamer is moved axially in the wellbore.
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U.K. Search Report, Application No. GB 0322614.9, dated Jan. 19, 2004.
Moser, Patterson & Sheridan L.L.P.
Tsay Frank
Weatherford / Lamb, Inc.
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