Steam injection is the development of heavy oil resource economic effective method. In order to reduce heat loss of steam injection process and protect casing, usually by Vacuum Insulated Tubing(VIT).
VIT generally uses double concentric tube, in the two layers of annulus inside pack insulation materials, and the pipe ends sealed to ensure good insulating properties.
Function of Pre-Stressed Vacuum Insulated Tubing
1. Reduces the heat loss, certainly the steam quality and the depth of steam injection can be increased.
2. Minimizes heat stress on casing and cement mantle, protect the casing from damage by high temperature.
3. During oil production it will provide superior insulation and greatly reduce the loss of heat energy.
Character of Pre-Stressed Vacuum Insulated Tubing
1. The pre-stress will compensate the tubing expansion caused by temperature difference between the inner and the outer tubes so as to ensure reliable operation under high temp.
2. Gas absorbing materials are packed inside the annulus to clean up harmful gas and
maintain good insulating property whilst in service.
3.Integrated application of heat insulation technology, contains vacuum, heat reflection, heat convection block , ensure super heat insulation performance ofthe insulated tubing
A. VIT Performance Level
| Heat-insulating property level | Heat conductivity coefficient,W/(m·℃) |
| A | 0.06≤λ<0.08 |
| B | 0.04≤λ<0.06 |
| C | 0.02≤λ<0.04 |
| D | 0.006≤λ<0.02 |
| E | 0.002≤λ<0.006 |
B. VIT Specification
Specification | Basic parameter | ||
Outer tube OD x Inner Tube ID(in x in) | Steel grade | Connection | Thread |
3 1/2 x 2 3/8 |
N80 L80 P110
| Inner connection Outer connection Extreme line connection
| 3 1/2 USS |
4 1/2 x 2 7/8 | 4 1/2 BC | ||
4 1/2 x 3 1/2 | 4 1/2 BC | ||
5 x 3 1/2 | 5BC | ||
5 1/2 x 4 1/2 | 5 1/2 BC | ||
7 x 5 1/2 | 7 BC | ||
C. Main Performance Parameters
| Heat conductivity coefficient (Inner tube inside wall 350℃) ,W/(m·℃) | Normal temperature tensile load, kN | Normal temperature tensile load, kN | Normal temperature tensile load, kN | Flatness % | |||
| Normal Temp. | Gas injection | Normal Temp. | Gas injection | ||||
| YG88X40 | 0.002~0.02 | ≥402 | 32 | 20 | 30 | 28 | ≤0.2 |
| YG88X50 | 0.002~0.02 | ≥432 | 32 | 20 | 30 | 28 | ≤0.2 |
| YG114X62 | 0.002~0.02 | ≥506 | 32 | 20 | 26 | 24 | ≤0.2 |
| YG114X76 | 0.002~0.02 | ≥537 | 32 | 20 | 26 | 24 | ≤0.2 |
| YG127X62 | 0.002~0.02 | ≥615 | 32 | 20 | 23 | 21 | ≤0.2 |
| YG127X76 | 0.002~0.02 | ≥615 | 32 | 20 | 23 | 21 | ≤0.2 |
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Vacuum Insulated Tubing（VIT）
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