Wells – Means for guiding insertable element laterally of well axis – Secured in operative position by movable means engaging well...
Reexamination Certificate
2005-04-19
2005-04-19
Bagnell, David (Department: 3672)
Wells
Means for guiding insertable element laterally of well axis
Secured in operative position by movable means engaging well...
C166S050000, C166S055700, C166S297000, C175S061000, C175S081000
Reexamination Certificate
active
06880631
ABSTRACT:
This invention relates to a whipstock casing milling system and, more particularly, to such a system in which a window mill is secured to a whipstock so that the system may be run into a well, set and operated to open a window in a casing during a single trip. The milling system of the present invention comprises a protrusion (B) provided on the whipface of the whipstock wherein the protrusion (B) forms an extension of a relatively steep ramp surface (45) of the whipface so as to reduce damage to said surface (45) at a juncture (A) of said surface (45) with a relatively shallow ramp surface or parallel surface (46) during use of the system. The protrusion (B) thereby avoids an undercutting of a casing and a thinning of the whipstock.
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International Publ. No. WO 98/04804, by Mark H. Lee et al., Apparatus and Method for Milling a Hole in A Casing.
Dewey Charles H.
McGarian Bruce
Bagnell David
Dykema Gossett PLLC
Gay Jennifer
Smith International Inc.
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