Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Patent
1990-06-04
1991-07-02
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Noncutting portion forwardly of cutting portion
166 556, 175382, 175410, 175413, 407 34, 408229, 408232, E21B 1026, E21B 1046
Patent
active
050279149
ABSTRACT:
A pilot casing mill for removing unwanted pipe from a well bore, which includes a cylindrical pilot having helical vanes and adapted for mounting on one end of a cylindrical mill body. The mill body is provided with longitudinal slots which receive outwardly-extending blades fitted with multiple cutting elements for engaging and cutting the pipe when the pilot casing mill is mounted on the end of a rotatable drill string and inserted in the well. In a preferred embodiment of the invention the blades are removably secured in the slots by removable wedge blocks and may be longitudinally adjusted in place to align adjacent rows of cutting elements, by operation of multiple adjusting screws seated against an adjusting screw ring mounted in a circumferential slot provided in the mill body.
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Dang Hoang C.
Harrison John M.
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