# US 2015/0144352 A1 · Chemical injection mandrel pressure shut off device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2015/0144352 A1 - Document ID: US20150144352A1 - Status: Published application - Kind: A1 - Application number: 14/091,750 - Filed: 2013-11-27 - Published: 2015-05-28 - Earliest claimed: 2013-11-27 - Assignees: Baker Hughes Incorporated - Inventors: Zhi Yong He; Jorge Arreola - Web page: https://patentgrep.com/patent/US20150144352A1 ## CPC - E21B 37/06: using chemical means for preventing or limiting {, e.g. eliminating,} the deposition of paraffins or like substances - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The shut off system of claim 1, where the inline valve assembly further comprises a check pad; where the check pad is in communication with the nipple to form a fluid leak proof contact and where the check pad contains a passage for the chemical flow line to contact the cylinder. ### Claim 3 (depends on 2) The shut off system of claim 2, where the inline valve assembly further comprises a sleeve; where the sleeve is in direct contact with the nipple to form a fluid leak proof contact and where the sleeve contains a passage for the chemical flow line to contact the cylinder. ### Claim 4 (depends on 3) The shut off system of claim 3, where the sleeve is disposed between the nipple and the check pad. ### Claim 5 (depends on 3) The shut off system of claim 3, further comprising a seal disposed between the sleeve and the nipple. ### Claim 6 (depends on 1) The shut off system of claim 1, where the inline valve assembly further comprises a compression ring; where the compression ring is disposed between the cylinder and check pad. ### Claim 7 (depends on 6) The shut off system of claim 6, where the compression ring comprises an elastomer or a soft metal. ### Claim 8 (depends on 1) The shut off system of claim 1, where the inline valve assembly comprises a nut; where the nut is operative to facilitate leak proof contact between a collet; the nipple, a sleeve and a check pad. ### Claim 9 (depends on 1) The shut off system of claim 1, where the cylinder comprises a cylinder head; and where the cylinder head comprises a valve seat that is contacted by the sealing object to terminate the flow of fluid from the chemical flow line to the mandrel channel. ### Claim 10 (depends on 1) The shut off system of claim 1, where the actuating assembly comprises an actuator; where the actuator is an electrical actuator; a pneumatic actuator, a hydraulic actuator; or a combination thereof. ### Claim 11 (depends on 1) The shut off system of claim 1, where the inline valve assembly, the valve assembly and the actuating assembly each contact test plugs that are used to test for leakages. ### Claim 12 (depends on 1) The shut off system of claim 1, where the inline valve assembly, the valve assembly and the actuating assembly each have O-rings disposed on their outer surfaces to prevent leakages. ### Claim 13 (depends on 1) The shut off system of claim 1, where the shut off system is disposed on an outer surface of a mandrel ### Claim 14 (depends on 13) The shut off system of claim 13, where the shut off system is disposed in a housing in the mandrel; where the housing has a protective cover that protects the shut off system. ### Claim 15 (depends on 1) The shut off system of claim 1, where the shut off system is disposed in a manifold; where the manifold is disposed in a slot in the mandrel; and where the mandrel comprises two halves; each half having a channel to encompass the shut off system. ### Claim 16 (depends on 1) The shut off system of claim 1, where the manifold is fixedly attached to the mandrel by screws. ### Claim 17 (depends on 1) The shut off system of claim 1, further comprising a switch line that establishes fluid communication between the actuating assembly and the chemical flow line and where the switch line is used to change the direction of travel of the piston shaft. ### Claim 18 A method comprising: discharging a chemical fluid from outside a wellbore to a mandrel channel through a chemical flow line in a shut off system; where the shut off system comprises: 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; increasing the pressure of the fluid in the chemical flow line to exceed the pressure exerted by the actuating system on the piston shaft; displacing the sealing object from the chemical flow line; and facilitating the flow of fluid from the chemical flow line to the mandrel channel. ### Claim 19 (depends on 18) The method of claim 18, further comprising actuating the piston to contact the chemical flow line; and preventing the flow of fluid from the chemical flow line to the mandrel channel. ### Claim 20 (depends on 19) The method of claim 19, where a direction of displacement of the sealing object is effected by transporting fluid via either the chemical flow line or a switch line that is in fluid communication with the actuating assembly.