| 摘要 |
A downhole tool including a tubular body having an upper connection and a lower connection and an axial borehole therethrough, wherein the upper and lower connections are configured to connect to a drilling assembly, at least one expandable component coupled to the tubular body and configured to selectively extend radially therefrom, and an actuation assembly configured to selectively actuate, deactuate, and reactuate the at least one component. A method of selectively actuating a downhole tool, wherein the downhole tool comprises a tubular body with an axial borehole therethrough and at least one component, the method including circulating a drilling fluid in the axial borehole of the downhole tool, actuating the at least one component, deactuating the at least one component, and reactuating the at least one component. An actuation assembly including a mandrel having an actuation chamber port, at least one drop device, a piston disposed within the mandrel and configured to move to open the actuation chamber port, at least one dart, a sleeve disposed within the mandrel and configured to move to close the actuation chamber port; and at least one biasing member configured to exert a force on the sleeve in an upstream direction.
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