| 摘要 |
A blade for a member that is supported on a rotatable well string to position the blade in operating position to engage and drill a well bore or enlarge a well bore. The blade has a bottom and side surface each with leading and trailing edges. Cutting elements extend along and terminate in the same plane as the leading bottom and side edges of the bottom and side surfaces; shock absorbers in the bottom surface extend below the bottom surface and cutting elements which shock absorbers are configured and spaced to form a non-continuous surface along and below the blade bottom surface to contact the earth ahead of the cutting elements to form annular spaced recesses or depressions in the earth so that when the cutting elements engage the earth, they do not contact a uniform earth extent or wall.
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