Dual-Walled Coiled Tubing Deployed Pump

Patent metadata

Field	Value
Publication number	US-2016258231-A1
Application number	US-201514635569-A
Country	US
Kind code	A1
Filing date	Mar 2, 2015
Priority date	Mar 2, 2015
Publication date	Sep 8, 2016
Grant date	—

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.

First claim

What is claimed is:

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.

Assignees

• Baker Hughes Inc

Inventors

• Naumann Andre J
• Livescu Silviu

Classifications

• E21B43/128 Primary

  Adaptation of pump systems with down-hole electric drives · CPC title

• E21B17/206 Primary

  with conductors, e.g. electrical, optical · CPC title

• E21B17/003 Primary

  with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence) · CPC title

• F04D13/10

  adapted for use in mining bore holes · CPC title

• E21B17/20

  Flexible or articulated drilling pipes {, e.g. flexible or articulated rods, pipes or cables} · CPC title