# US 2020/0399981 A1 · Modular hydraulic intensification system for downhole equipment function and chemical injection services > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399981 A1 - Document ID: US20200399981A1 - Status: Published application - Kind: A1 - Application number: 16/910,117 - Filed: 2020-06-24 - Published: 2020-12-24 - Earliest claimed: 2019-06-24 - Assignees: OneSubsea IP UK Limited - Applicants: OneSubsea IP UK Limited - Inventors: Adam Tusing; Greg Manson - Web page: https://patentgrep.com/patent/US20200399981A1 ## CPC - E21B 34/045: {adapted to be lowered on a tubular string into position within a blow-out preventer stack, e.g. so-called test trees} - F15B 11/032: by means of fluid-pressure converters - E21B 33/0355: {Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads} - E21B 33/064: specially adapted for underwater well heads - F15B 3/00: Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids {(fluid-driven pumps F04B9/08)} - F15B 2211/21: Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge - F15B 2211/3052: Shuttle valves - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS - F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR ## Abstract A modular hydraulic intensification system includes a housing configured to be deployed within a subsea landing string. The modular hydraulic intensification system also includes multiple hydraulic intensifiers positioned within the housing, wherein each hydraulic intensifier includes a first chamber configured to fluidly couple to a hydraulic fluid supply and a second chamber configured to fluidly couple to one or more landing string valves within a lower portion of the subsea landing string. The modular hydraulic intensification system further includes a shuttle valve fluidly coupled to the respective second chambers of the multiple hydraulic intensifiers, wherein the shuttle valve is configured to enable flow of an output fluid across the shuttle valve from the respective second chambers of the multiple hydraulic intensifiers and to block backflow of the output fluid across the shuttle valve toward the respective second chambers of the multiple of hydraulic intensifiers. ## Claims ### Claim 1 A modular hydraulic intensification system for use in a subsea landing string, the modular hydraulic intensification system comprising: a housing configured to be deployed within the subsea landing string; a plurality of hydraulic intensifiers positioned within the housing, wherein each hydraulic intensifier of the plurality of hydraulic intensifiers comprises a first chamber configured to fluidly couple to a hydraulic fluid supply and a second chamber configured to fluidly couple to one or more landing string valves within a lower portion of the subsea landing string; and a shuttle valve fluidly coupled to the respective second chambers of the plurality of hydraulic intensifiers, wherein the shuttle valve is configured to enable flow of an output fluid across the shuttle valve from the respective second chambers of the plurality of hydraulic intensifiers toward the one or more landing string valves and to block backflow of the output fluid across the shuttle valve toward the respective second chambers of the plurality of hydraulic intensifiers. ### Claim 2 (depends on 1) The modular hydraulic intensification system of claim 1, comprising a pilot operated valve in fluid communication with the shuttle valve on a downstream side of the shuttle valve. ### Claim 3 (depends on 1) The modular hydraulic intensification system of claim 1, comprising a bleed off circuit in fluid communication with the shuttle valve on a downstream side of the shuttle valve. ### Claim 4 (depends on 1) The modular hydraulic intensification system of claim 1, comprising a filter positioned between the plurality of hydraulic intensifiers and the hydraulic fluid supply. ### Claim 5 (depends on 1) The modular hydraulic intensification system of claim 1, wherein the plurality of hydraulic intensifiers is positioned in a parallel arrangement. ### Claim 6 (depends on 1) The modular hydraulic intensification system of claim 1, comprising a pressure sensor positioned between the respective second chambers of the plurality of hydraulic intensifiers and the one or more landing string valves of the lower portion of the subsea landing string, and a controller configured to receive a signal indicative of a pressure at the pressure sensor and to adjust an input pressure of the hydraulic fluid supply until the pressure at the pressure sensor reaches a desired pressure. ### Claim 7 (depends on 1) The modular hydraulic intensification system of claim 1, comprising a controller and a pilot operated control valve, wherein the controller is configured to adjust a flow of control fluid to the pilot operated control valve to adjust the pilot operated control valve from a first position to a second position to block the flow of the output fluid to the one or more landing string valves of the lower portion of the subsea landing string. ### Claim 8 A landing string system, comprising: a lower portion configured to be landed within a stack assembly of a subsea system, wherein the lower portion comprises one or more valves that are configured to seal a bore to block a flow of well fluid from a wellbore toward a surface; and a modular hydraulic intensification system coupled to the lower portion, wherein the modular hydraulic intensification system comprises: a first hydraulic intensifier and a second hydraulic intensifier, wherein the first hydraulic intensifier and the second hydraulic intensifier each comprise a respective low-pressure chamber that is configured to fluidly couple to a hydraulic fluid supply at the surface and a high-pressure chamber configured to fluidly couple to the one or more valves within the lower portion of the landing string system; and a shuttle valve fluidly coupled to the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier, wherein the shuttle valve is configured to enable flow of an output fluid across the shuttle valve from the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier and to block backflow of the output fluid across the shuttle valve toward the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier. ### Claim 9 (depends on 8) The landing string system of claim 8, comprising one or more ports configured to enable chemical injection into the lower portion of the landing string system, wherein the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier are fluidly coupled to the one or more ports. ### Claim 10 (depends on 8) The landing string system of claim 8, wherein the modular hydraulic intensification system comprises a housing positioned between a tubular of the landing string system and the lower portion of the landing string system. ### Claim 11 (depends on 8) The landing string system of claim 8, wherein the modular hydraulic intensification system is positioned at least partially within a marine drilling riser that extends between the stack assembly having one or more blowout preventers and a platform at the surface. ### Claim 12 (depends on 8) The landing string system of claim 8, further comprising a pilot operated valve in fluid communication with the shuttle valve on a downstream side of the shuttle valve. ### Claim 13 (depends on 8) The landing string system of claim 8, comprising: a first line that extends from the shuttle valve to a first valve of the one or more valves of the lower portion of the landing string system to thereby fluidly couple the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier to the first valve of the one or more valves of the lower portion of the landing string system; and a second line that splits off from the first line at a tee to fluidly couple the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier to a second valve of the one or more valves of the lower portion of the landing string system. ### Claim 14 (depends on 13) The landing string system of claim 13, comprising a first pilot operated valve positioned along the first line between the tee and the first valve, and a second pilot operated valve positioned along the second line between the split and the second valve. ### Claim 15 (depends on 8) The landing string system of claim 8, comprising a bleed off circuit in fluid communication with the shuttle valve on a downstream side of the shuttle valve. ### Claim 16 (depends on 8) The landing string system of claim 8, wherein the first hydraulic intensifier and the second hydraulic intensifier are positioned in a parallel arrangement. ### Claim 17 (depends on 8) The landing string system of claim 8, comprising a pressure sensor positioned between the respective high-pressure chambers of the first hydraulic intensifier and the second hydraulic intensifier and the one or more valves of the lower portion of the landing string system, and a controller configured to receive a signal indicative of a pressure at the pressure sensor and to adjust an input pressure of the hydraulic fluid supply until the pressure at the pressure sensor reaches a desired pressure. ### Claim 18 (depends on 8) The landing string system of claim 8, comprising a controller and a pilot operated control valve, wherein the controller is configured to adjust a flow of control fluid to the pilot operated control valve to adjust the pilot operated control valve from a first position to a second position to block the flow of the output fluid to the one or more valves of the lower portion of the landing string system. ### Claim 19 A method of operating a modular hydraulic intensification system, the method comprising: receiving, at respective low-pressure chambers of a plurality of hydraulic intensifiers, an input fluid at a first pressure; outputting, at respective high-pressure chambers of the plurality of hydraulic intensifiers, an output fluid at a second pressure that is greater than the first pressure; and enabling the output fluid to flow from the respective high-pressure chambers of the plurality of hydraulic intensifiers toward one or more valves of a lower portion of a landing string and blocking the output fluid from returning to the respective high-pressure chambers of the plurality of hydraulic intensifiers via a shuttle valve. ### Claim 20 (depends on 19) The method of claim 19, comprising controlling a flow of fluid to adjust a pilot operated control valve between a first position in which the pilot operated control valve enables the output fluid to flow to the one or more valves of the lower portion of the landing string and a second position in which the pilot operated control valve blocks the output fluid from flowing to the one or more valves of the lower portion of the landing string.