# US 2016/0258231 A1 · Dual-Walled Coiled Tubing Deployed Pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2016/0258231 A1 - Document ID: US20160258231A1 - Status: Published application - Kind: A1 - Application number: 14/635,569 - Filed: 2015-03-02 - Published: 2016-09-08 - Earliest claimed: 2015-03-02 - Assignees: Baker Hughes Incorporated - Applicants: Baker Hughes Incorporated - Inventors: Andre J. Naumann; Silviu Livescu - Web page: https://patentgrep.com/patent/US20160258231A1 ## CPC - E21B 17/206: {with conductors, e.g. electrical, optical} - E21B 17/003: {with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence)} - E21B 43/128: {Adaptation of pump systems with down-hole electric drives} - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract Dual-walled coiled tubing assemblies are used to dispose an electric device, such as an electric submersible pump into a wellbore. Dual-walled coiled tubing assemblies include an inner coiled tubing string and an outer coiled tubing string as well as a power cable. ## Claims ### Claim 1 A dual-walled coiled tubing assembly to dispose an electric submersible pump into a wellbore, the dual-walled coiled tubing assembly comprising: an inner coiled tubing string defining an inner coiled tubing central axial pathway along its length; an outer coiled tubing string radially surrounding the inner coiled tubing string, the outer coiled tubing string defining an outer coiled tubing string central axial passage along its length; and a power cable to provide electric power to the electric device, the power cable being disposed within the outer coiled tubing string central axial passage. ### Claim 2 (depends on 1) The dual-walled coiled tubing assembly of claim 1 wherein the power cable is further disposed within the inner coiled tubing central axial passageway. ### Claim 3 (depends on 1) The dual-walled coiled tubing assembly of claim 1 wherein the power cable is disposed radially between the inner coiled tubing string and the outer coiled tubing string. ### Claim 4 (depends on 1) The dual-walled coiled tubing assembly of claim 1 further comprising one or more capillary lines disposed within the outer coiled tubing string. ### Claim 5 (depends on 4) The dual-walled coiled tubing assembly of claim 4 wherein the one or more capillary lines is/are located radially between the inner coiled tubing string and the outer coiled tubing string. ### Claim 6 (depends on 4) The dual-walled coiled tubing assembly of claim 4 wherein the one or more capillary lines is/are located radially within the inner coiled tubing string. ### Claim 7 (depends on 4) The dual-walled coiled tubing assembly of claim 4 wherein the one or more capillary lines is/are located within the power cable. ### Claim 8 (depends on 1) The dual-walled coiled tubing assembly of claim 1 further comprising separate first and second fluid flow paths defined within the outer coiled tubing string. ### Claim 9 (depends on 1) The dual-walled coiled tubing assembly of claim 1 further comprising at least one strap securing the power cable to the inner coiled tubing string. ### Claim 10 (depends on 1) The dual-walled coiled tubing assembly of claim 1 wherein the electric submersible pump assembly includes a pump section and a motor section. ### Claim 11 (depends on 1) The dual-walled coiled tubing assembly of claim 1 wherein the power cable presents an axial cross-section having: a first side surface that is concave and shaped to be generally complementary to an outer radial surface of the inner coiled tubing string; and a second side surface that is convex and shaped to be generally complementary to an inner radial surface of the outer coiled tubing string. ### Claim 12 A hydrocarbon production assembly to produce hydrocarbon fluid from a wellbore, the production assembly comprising: an electric submersible pump; a dual-walled coiled tubing assembly to dispose the electric submersible pump into the wellbore, the dual-walled coiled tubing assembly comprising: an inner coiled tubing string defining an inner coiled tubing central axial pathway along its length; an outer coiled tubing string radially surrounding the inner coiled tubing string, the outer coiled tubing string defining an outer coiled tubing string central axial passage along its length; and a power cable to provide electric power to the electric submersible pump, the power cable being disposed within the outer coiled tubing string central axial passage. ### Claim 13 (depends on 12) The hydrocarbon production assembly of claim 12 wherein the power cable is further disposed within the inner coiled tubing central axial passageway. ### Claim 14 (depends on 12) The hydrocarbon production assembly of claim 12 wherein the power cable is disposed radially between the inner coiled tubing string and the outer coiled tubing string. ### Claim 15 (depends on 12) The hydrocarbon production assembly of claim 12 further comprising one or more capillary lines disposed within the outer coiled tubing string. ### Claim 16 (depends on 15) The hydrocarbon production assembly of claim 15 wherein the one or more capillary lines is/are located radially between the inner coiled tubing string and the outer coiled tubing string. ### Claim 17 (depends on 15) The hydrocarbon production assembly of claim 15 wherein the one or more capillary lines is/are located within the power cable. ### Claim 18 (depends on 12) The hydrocarbon production assembly of claim 12 further comprising separate first and second fluid flowpaths defined within the outer coiled tubing string. ### Claim 19 (depends on 12) The hydrocarbon production assembly of claim 12 further comprising at least one strap securing the power cable to the inner coiled tubing string. ### Claim 20 (depends on 12) The hydrocarbon production assembly of claim 12 wherein the power cable presents an axial cross-section having: a first side surface that is concave and shaped to be generally complementary to an outer radial surface of the inner coiled tubing string; and a second side surface that is convex and shaped to be generally complementary to an inner radial surface of the outer coiled tubing string. ### Claim 21 (depends on 12) The hydrocarbon production assembly of claim 12 further comprising a packer forming a seal between the dual-walled coiled tubing assembly and the wellbore and wherein: an annulus is defined between the dual-walled coiled tubing assembly and the wellbore; and production fluid is flowed through the annulus. ### Claim 22 (depends on 12) The hydrocarbon production assembly of claim 12 further comprising a packer forming a seal between the dual-walled coiled tubing assembly and the wellbore and wherein: an annulus is defined between the dual-walled coiled tubing assembly and the wellbore; and production fluid is flowed through the dual-walled coiled tubing assembly. ### Claim 23 (depends on 12) The hydrocarbon production assembly of claim 12 further comprising a packer forming a seal between the dual-walled coiled tubing assembly and the wellbore and wherein: an annulus is defined between the dual-walled coiled tubing assembly and the wellbore; and production fluid is flowed through the annulus and the dual-walled coiled tubing assembly. ### Claim 24 (depends on 12) The dual-walled coiled tubing assembly of claim 12 further comprising separate first and second fluid injection paths defined within the outer coiled tubing string. ### Claim 25 (depends on 12) The dual-walled coiled tubing assembly of claim 12 wherein at least one of the inner and outer coiled tubing strings are formed of corrosion-resistant material and one of the inner and outer coiled tubing strings is composed of a grade of metal that is different from that of the other of the inner and outer coiled tubing strings. ### Claim 26 (depends on 12) The dual-walled coiled tubing assembly of claim 12 wherein a metal-to-metal lubricant is used during manufacture of the dual-walled coiled tubing assembly.