Coating processes – With cutting – holding – severing – or abrading the base
Patent
1978-09-28
1980-03-18
Kendall, Ralph S.
Coating processes
With cutting, holding, severing, or abrading the base
285333, 219 761, 51290, E21C 1300, F16L 1500
Patent
active
041940318
ABSTRACT:
A method of prolonging the life of a tool joint on a drilling pipe, the tool joint including an external tapered surface of 18.degree. providing an elevator shoulder, including steps of preparing or treating the tapered eroded surface, depositing in the area of said tapered surface a selected amount of material of selected metal hardness, and grinding the external surface portions of said deposited material to provide a smooth external uninterrupted surface of selected hardness and smoothness and inclined at 18.degree. to the longitudinal axis of said pipe. A tool joint for a drill pipe having an external cylindrical surface and an external tapered surface merging with the surface of the pipe length, said external tapered surface on hardened metal being smooth, uninterrupted, and lying in a surface generated by rotating a straight line at an angle of 18.degree. to the axis of the drill pipe.
REFERENCES:
patent: 3219397 (1965-11-01), Heldenbrand et al.
patent: 3611541 (1971-10-01), Garrett
patent: 3816861 (1974-06-01), Jungle et al.
patent: 3989554 (1976-11-01), Wisler
Brantly, History of Oil Well Drilling, Book Division Gulf Publishing Co., Houston, Tex., 1971, pp. 1014, 1028-1030.
AMF Incorporated
Kendall Ralph S.
Price George W.
Worth Charles J.
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