Tubewire injection buckling mitigation
View Patent ↗A tubewire buckling mitigation assembly for use with injection of tubewire into coiled tubing. The mitigation assembly includes a passageway having a small diameter passage, an intermediate diameter section and first and second tapered transition sections.
1. A tubewire injection system for injecting tubewire into coiled tubing, the system comprising:
a tubewire injector having a drive mechanism to apply an axial pushing force to inject the tubewire;
coiled tubing having an inner diameter and presenting an open whip end into which the tubewire is injected; and
a tubewire buckling mitigation assembly located between the injector and the coiled tubing and comprising a passageway which receives the tubewire from the injector, the passageway providing:
a small diameter passage having an interior diameter that inhibits buckling of the tubewire;
an intermediate diameter section having an interior diameter that permits limited buckling of the tubewire; and
a first tapered transition section disposed between the small diameter passage and the intermediate diameter section; and
a second tapered transition section disposed between the intermediate diameter section and the open whip end, the second tapered transition section providing a tapered transition which opens from the intermediate diameter section to the open whip end.
2. The tubewire injection system of claim 1 wherein the intermediate diameter section presents an interior diameter that is sized to inhibit bucking of the tubewire.
3. The tubewire injection system of claim 1 wherein the intermediate diameter section has a length that generates axial resistance friction force with the tubewire to resist injection forces.
4. The tubewire injection system of claim 1 wherein the intermediate diameter section has a length that is from about 5 feet to about 20 feet.
5. The tubewire injection system of claim 4 wherein the intermediate diameter section has a length that is about 10 feet.
6. The tubewire injection system of claim 1 wherein the first tapered transition section has an angle of taper of about one degree.
7. The tubewire injection system of claim 1 wherein the second tapered transition section has an angle of taper of about one degree.
8. A tubewire injection system for use with a tubewire injector having a drive mechanism to apply an axial pushing force to inject tubewire into coiled tubing, the system comprising:
coiled tubing having an inner diameter and presenting an open whip end into which the tubewire is injected; and
a tubewire buckling mitigation assembly located between the injector and the coiled tubing and comprising a passageway which receives the tubewire from the injector, the passageway providing:
a small diameter passage having an interior diameter that inhibits buckling of the tubewire;
an intermediate diameter section having an interior diameter that permits limited buckling of the tubewire;
a first tapered transition section disposed between the small diameter passage and the intermediate diameter section; and
a second tapered transition section disposed between the intermediate diameter section and the open whip end, the second tapered transition section providing a tapered transition which opens from the intermediate diameter section to the open whip end.
9. The tubewire injection system of claim 8 wherein the intermediate diameter section presents an interior diameter that is sized to inhibit bucking of the tubewire.
10. The tubewire injection system of claim 8 wherein the intermediate diameter section has a length that generates axial resistance friction force with the tubewire to resist injection forces.
11. The tubewire injection system of claim 8 wherein the intermediate diameter section has a length that is from about 5 feet to about 20 feet.
12. The tubewire injection system of claim 11 wherein the intermediate diameter section has a length that is about 10 feet.
13. The tubewire injection system of claim 8 wherein the first and second tapered transition sections have an angle of taper from about one degree to about five degrees.