Dual-Walled Coiled Tubing Deployed Pump
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.
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.
2 . The dual-walled coiled tubing assembly of claim 1 wherein the power cable is further disposed within the inner coiled tubing central axial passageway.
3 . 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.
4 . The dual-walled coiled tubing assembly of claim 1 further comprising one or more capillary lines disposed within the outer coiled tubing string.
5 . 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.
6 . 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.
7 . The dual-walled coiled tubing assembly of claim 4 wherein the one or more capillary lines is/are located within the power cable.
8 . 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.
9 . 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.
10 . The dual-walled coiled tubing assembly of claim 1 wherein the electric submersible pump assembly includes a pump section and a motor section.
11 . 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.
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.
13 . The hydrocarbon production assembly of claim 12 wherein the power cable is further disposed within the inner coiled tubing central axial passageway.
14 . 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.
15 . The hydrocarbon production assembly of claim 12 further comprising one or more capillary lines disposed within the outer coiled tubing string.
16 . 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.
17 . The hydrocarbon production assembly of claim 15 wherein the one or more capillary lines is/are located within the power cable.
18 . The hydrocarbon production assembly of claim 12 further comprising separate first and second fluid flowpaths defined within the outer coiled tubing string.
19 . The hydrocarbon production assembly of claim 12 further comprising at least one strap securing the power cable to the inner coiled tubing string.
20 . 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.
21 . 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.
22 . 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.
23 . 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.
24 . 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.
25 . 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.
26 . 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.