Insulated Pipes
Insulated oil tubes are double-layered concentric columns, with the annular space between the two layers of tubes filled with adiabatic material, inert gas or vacuum.
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Comprehensively applying the three major heat-insulating technologies of vacuum extraction, heat reflection and heat convection blocking, the super heat-insulating performance of the heat-insulating oil pipe is created. It reduces the heat loss of steam injection, improves the injectable depth and steam dryness of the injected reservoir; reduces the thermal stress of casing and cement ring to prevent high temperature damage of casing; and reduces the heat loss in the process of crude oil lifting. Mainly used in thick oil thermal recovery (steam throughput), SAGD expansion to brine extraction, surface transportation, geothermal extraction and so on.
Grades: J55, K55, L80, N80, 80SS, P110
Length Range: R2 or R3
Threading: Inner tube and outer tube threading
Connections: Semi-premium and premium available
Normal operating temperature: 350 Celsius
Conductivity (k) of inner pipe: 0.002 ~ 0.08 W/m·℃
| API 5CT Insulated Tubing (VIT) | |||||
| Model
Outer tube OD x Inner Tube OD (in x in) |
Outer Pipe
ODxWT (mm) |
Inner Pipe
ODxWT (mm) |
Coupling OD
(mm) |
Cementing Center
(in) |
Thread |
| 3 1/2 x 2 3/8 | 88.9 x 6.45 | 60.3 x 4.83 | 108 | 5 | 3 1/2 USS |
| 4 1/2 x 2 7/8 | 114.3 x 6.88 | 73.02 x 5.51 | 132 | 7 | 4 1/2 BC |
| 4 1/2 x 3 1/2 | 114.3 x 6.88 | 88.9 x 6.45 | 132 | 7 | 4 1/2 BC |
| 5 x 3 1/2 | 127.0 x 9.19 | 88.9 x 6.45 | 141.3 | 9 5/8 | 5BC |
| 5 1/2 x 4 1/2 | 139.7 x 7.72 | 114.3 x 6.35 | 154 | 5 1/2 BC | |
| 7 x 5 1/2 | 177.8 x 9.19 | 139.7 x 7.72 | 154 | 7 BC | |
| Insulation Grades Available | |||||
| Grade/Conductivity | A | B | C | D | E |
| Heat conductivity coefficient
K=Watt/Meter x Celsius |
0.06 ~ 0.08 | 0.04 ~ 0.06 | 0.02 ~ 0.04 | 0.006 ~ 0.02 | 0.002 ~ 0.006 |
Insulated Pipe Detail
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