Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1986-03-31
1987-05-19
Suchfield, George A.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
138145, 175409, 175411, E21B 704, E21B 1710
Patent
active
046659960
ABSTRACT:
Hardfacing the principal bearing surface of a drill pipe with an alloy having the composition of: 50-65% Cobalt, 25-35% Molybdenum, 1-18% Chromium, 2-10% Silicon and less than 0.1% Carbon reduces the friction between the drill string and the casing or rock. As a result, the torque needed for the rotary drilling operation, especially directional drilling, is decreased. The alloy also provides excellent wear resistance on the drill string while reducing the wear on the well casing.
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"A User's Guide to Drill String Hardfacing", ASME Publication No. 83-PET-20, presented at the 6th Annual Energy-Sources Technology Conference and Exhibition, Houston, Texas (Jan. 31-Feb. 3, 1983).
"The Role of Molybdenum as an Alloy Element in Adhesive wear Resistance", by Z. A. Foroulis, appearing in Speciality Steels and Hard Materials, edited by N. R. Comins and J. B. Clark, Pergamon Press, Oxford, England (1983).
"Hardfacing", Metals Handbook, 9th Ed., vol. 6, Welding Brazing and Soldering, American Society for Metals: Metals Park, Ohio (1983).
Foroulis Z. Andrew
Tsao Yuh H.
Cox Hubert E.
Exxon Production Research Company
Suchfield George A.
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