Well Bore Casing Cutting Tool Having An Improved Blade Structure and Pad Type Stabilizers

摘要

A downhole cutting tool for cutting sections or “windows” in tubular strings in wellbores has rotating cutters and a lower stabilizer section, both actuated by a fluid operated mechanism. The stabilizer section keeps the downhole cutting tool centralized in the tubular string. The cutters may have a robust profile and structure which enhances the window cutting function and permits passage of an operating rod to operate the stabilizer section.

主权项

1. A downhole cutting tool, comprising:
a) a main body having a bore therethrough, and a fluid piston disposed in said bore and longitudinally movable therein, said piston having a bore therethrough; b) a plurality of rotatably mounted blades mounted in said main body, movable from a first position retracted into said main body and a second position rotated outwardly from said main body; c) a plurality of pairs of positioning arms rotatably mounted in said main body, and movable from a first position retracted into said main body and a second position rotated outwardly from said main body; and d) a stabilizer pad mounted on each pair of positioning arms, whereby when said stabilizer arms are rotated outwardly said stabilizer pad is moved radially outward from said main body and held generally parallel to said main body; wherein said fluid piston bears on said said blades under the influence of fluid flow through said bore of said main body, thereby rotating said blades from said first position to said second position, and wherein said fluid piston further comprises an operating rod extension which bears on at least one of said pairs of operating arms, thereby rotating said operating arms from said first position to said second position and moving said stabilizer pads outwardly.