Patent ID: 11885188
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 15:
16. A section mill assembly comprising:
(a) a tool carrier pipe string having a tool carrier pipe string central fluid bore;
(b) a top sub having a top sub central fluid bore in fluid communication with said tool carrier pipe string central fluid bore;
(c) a section mill comprising
(i) a longitudinally extending tubular mill body, said longitudinally extending tubular mill body having an upper end, a lower end, a mill body central fluid bore, and a mill window, said upper end of said longitudinally extending tubular mill body attached to said top sub with said mill body central fluid bore in fluid communication with said top sub central fluid bore;
(ii) a mill carrier positioned within said longitudinally extending tubular mill body, said mill carrier having an exterior surface and an interior surface, said interior surface of said mill carrier having a beveled ramp profile;
(iii) a hinge pin transversely mounted to said longitudinally extending tubular mill body, said hinge pin pivotally mounting said mill carrier to said longitudinally extending tubular mill body within said central bore of said longitudinally extending tubular mill body whereby said mill carrier is configured to pivot longitudinally radially outward and inward through said mill window with respect to said longitudinally extending tubular mill body;
(iv) a translatable piston having an elongated driveshaft, said elongated driveshaft having an upper portion and a lower portion, said lower portion of said elongated driveshaft having a cylindrical nose cone extending radially from said elongated driveshaft, whereby said cylindrical nose cone is engageable with said beveled ramp profile of said interior surface of said mill carrier by downward translation of said translatable piston and disengageable from said beveled ramp profile of said interior surface of said mill carrier by upward translation of said translatable piston;
(v) a compression spring positioned around said elongated driveshaft, said compression spring extending between said translatable piston and an interior shoulder on said tubular mill body, said translatable piston biased in an upward position by said compression spring; and
(vi) wherein said mill carrier is configured to pivot on said hinge pin radially outward from said mill window at an acute angle and inward from said acute angle through said mill window in response to engagement of said nose cone with said beveled ramp profile of said mill carrier by said downward and said upward translation of said translatable piston.