Method for assembly of well heaters
A method for assembly of a well heater including injecting a length of coiled tubing into a well, supporting the coiled tubing in the well and cutting the coiled tubing above the well head; injecting one or more resistive heating cables into the into the coiled tubing; constructing a cable support structure at the cut end of the coiled tubing for supporting the weight of the cables against the inner sidewall of the coiled tubing; cutting the cables and configuring the cut ends of the cables for connection to an electrical source, thereby defining the structure of the well heater; and withdrawing the well heater from the well.
1. A method for assembly of a well heater, the method comprising:
a) injecting a length of coiled tubing into a well, supporting the coiled tubing in a well head and cutting the coiled tubing above the well head;
b) injecting one or more resistive heating cables into the coiled tubing;
c) constructing a cable support structure at the cut end of the coiled tubing for supporting the weight of the cables against the inner sidewall of the coiled tubing;
d) cutting the cables and configuring the cut ends of the cables for connection to an electrical source, thereby defining the structure of the well heater; and
e) withdrawing the well heater from the well.
2. The method of claim 1 wherein the well is a vertical well or a deviated well.
3. The method of claim 2 wherein the deviated well is deviated from vertical by between about 30 degrees to about 50 degrees.
4. The method of claim 3 wherein the deviated well is deviated from vertical by between about 35 to about 45 degrees.
5. The method of claim 1 wherein step b) includes injection of three resistive heating cables which are connected at their injected ends by a wye splice.
6. The method of claim 5 wherein the three resistive heating cables are configured for transmission of three-phase electrical power.
7. The method of claim 1 wherein step a) includes attaching a cover to the injected end of the coiled tubing.
8. The method of claim 1 further comprising attaching one or more temperature measurement lines to one or more of the cables and injecting the temperature measurement lines into the coiled tubing together with the cables.
9. The method of claim 8 wherein the temperature measurement lines include a thermocouple line or a fiber optic line configured for distributed temperature sensing.
10. The method of claim 8 wherein the temperature measurement lines include at least one thermocouple line and at least one fiber optic line configured for distributed temperature sensing.
11. The method of claim 1 wherein step f) includes a process of reeling the well heater onto a coiled tubing reel.
12. A method for assembly of a well heater, the method comprising:
a) injecting a length of coiled tubing into a well, supporting the coiled tubing in a well head and cutting the coiled tubing above the well head;
b) injecting three resistive heating cables into the coiled tubing, wherein the three resistive heating cables are connected at their injected ends by a wye splice;
c) constructing a cable support structure at the cut end of the coiled tubing for supporting the weight of the cables against the inner sidewall of the coiled tubing;
d) cutting the cables and configuring the cut ends of the cables for connection to an electrical source, thereby defining the structure of the well heater; and
e) withdrawing the well heater from the well.
13. The method of claim 12 wherein the three resistive heating cables are configured for transmission of three-phase electrical power.
14. The method of claim 12 wherein the well is a vertical well or a deviated well.
15. The method of claim 14 wherein the deviated well is deviated from vertical by between about 30 degrees to about 50 degrees.
16. The method of claim 15 wherein the deviated well is deviated from vertical by between about 35 to about 45 degrees.
17. The method of claim 14 wherein the three resistive heating cables are configured for transmission of three-phase electrical power.
18. The method of claim 12 wherein step a) includes attaching a cover to the injected end of the coiled tubing.
19. The method of claim 12 further comprising attaching one or more temperature measurement lines to one or more of the cables and injecting the temperature measurement lines into the coiled tubing together with the cables.
20. The method of claim 19 wherein the temperature measurement lines include a thermocouple line or a fiber optic line configured for distributed temperature sensing.
21. The method of claim 19 wherein the temperature measurement lines include at least one thermocouple line and at least one fiber optic line configured for distributed temperature sensing.
22. The method of claim 1 wherein step f) includes a process of reeling the well heater onto a coiled tubing reel.