Downhole power delivery tool powered by hydrostatic pressure

摘要

A downhole power delivery tool positionable in a wellbore through a fluidproducing formation, the downhole power delivery tool comprising: a body having a chamber disposed therein, the body defining an inlet proximate to the chamber; an actuation mechanism disposed in the body and adjacent to the inlet, wherein the actuation mechanism allows communication of hydrostatic pressure via the inlet to the chamber from an annulus external to the body in response to an actuation force being applied to the actuation mechanism; a piston proximate to the chamber, wherein the hydrostatic pressure communicated to the chamber in response to the actuation force being applied to the actuation mechanism applies a first force to the piston, wherein the piston applies a second force to a rod movable relative to the body in response to the first force being applied to the piston; and a hydraulic timer assembly comprising: a timer piston; a hydraulic fluid positioned adjacent to the timer piston; and a metering mechanism positioned proximate to the timer piston such That a flow of the hydraulic fluid is restricted by the metering mechanism; wherein the timer piston is movable from a first position to a second position in response to the actuation force over a period of time corresponding to a flow rate of the flow of the hydraulic fluid as restricted by the metering mechanism and wherein the timer piston in the second position is positioned such that the actuation force is applied to the actuation mechanism by the timer piston. SilO Nil I v! K > :.- " 'A V willl ~ (Vi ~ .n N'IV/aIt) en iii~'