CHEMICAL INJECTION MANDREL PRESSURE SHUT OFF DEVICE

摘要

Disclosed herein is a shut off system for a hydrocarbon recovery mandrel comprising an inline valve assembly comprising a nipple comprising a chemical flow line; the chemical flow line being operative to transfer fluids from outside the wellbore to a mandrel channel; where the mandrel channel is disposed in the mandrel; a valve assembly comprising a cylinder and a piston shaft; where the cylinder contacts the chemical flow line; where the piston shaft reciprocates in the cylinder in response to opposing applied pressures; where the piston shaft contacts a sealing object that is operative to facilitate or to prevent fluid flow from the chemical flow line to the mandrel channel; where the cylinder comprises a port that provides fluid communication from the cylinder to the mandrel channel; and an actuating assembly; where the actuating assembly is operative to displace the piston shaft in the cylinder to prevent fluid communication between the chemical flow line and the mandrel channel.