| 摘要 |
A downhole apparatus for engaging a borehole in a subterranean formation includes a tubular body having a longitudinal axis and a first bore, an actuation element having a second bore and is positioned within the first bore of the tubular body, a drilling fluid flow path extending through the first and second bores, and a restriction element trap positioned within the second bore of the actuation element. The actuation element is configured to selectively retain an operable component of the downhole apparatus in an initial position and the restriction element trap is configured for retentively receiving a restriction element. A restriction element trap for use with an actuation element for retentively receiving a restriction element and an expandable reamer apparatus for enlarging a borehole in a subterranean formation are also provided. Further provided is a method of activating a downhole apparatus within a borehole of a subterranean formation. |
