A method for reducing residual stress in a roller cone bit

A roller cone bit (11) has a ball retention system to secure the cones (17) to the head (15). A radial ball race (19) includes a ball way (21) with a ball plug (27) to keep the balls (25) in the ball race. The ball plug (27) is secured to the head by welding. Any residual stress in the weld region i...

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Bibliographic Details
Main Authors JONES, RONNIE L, BEUERSHAUSEN, CHRISTOPHER G, NGUYEN, DON Q, ZAHRADNIK, ANTON F, RICKS, GREGORY L, SULLIVAN, ERIC C
Format Patent
LanguageEnglish
French
German
Published 16.09.2009
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A roller cone bit (11) has a ball retention system to secure the cones (17) to the head (15). A radial ball race (19) includes a ball way (21) with a ball plug (27) to keep the balls (25) in the ball race. The ball plug (27) is secured to the head by welding. Any residual stress in the weld region is alleviated by applying heat or vibration to promote relaxation.
Bibliography:Application Number: EP20090007821