Vacuum Insulated Tubing

  • Vacuum insulated tubing & casing are reusable;
  • Reduces heat loss ensuring optimal steam quality being injected into the oil formation;
  • Minimizes heat stress on well casing and cement mantle, decreases unwanted annulus pressure;
  • Improves well life cycle cost and avoids failure due to well integrity issues;
  • Optimized cyclic steam stimulation cycles for better overall project economics;
  • Important technology for the economic production of deeper heavy oil formations.

Description

Vacuum Insulated Tubing

 

Vacuum Insulated Tubing (VIT) is designed to develop oil and gas fields located in the most challenging oil and gas production conditions.

For example, Pre-stressed Vacuum Insulated Tubing (VIT) replaces oil tubing for heavy oil recovery by steam injection to improve project economics.

Vacuum insulated tubing & casing uses water-based fiber cloth material with a three grade vacuum pump equipment, automatic welding machine and MT. These guarantees a high degree of vacuum level that meets the insulation grades D and E.

These vacuum insulated tubing & casing use an effective getter to ensure the tubing insulation grade do not decrease after a long time of outdoor storage.

Techanical Specification

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 Vacuum Insulated Tubing  (VIT)
ModelOuter tube OD x Inner Tube OD

(in x in)

Outer PipeODxWT (mm) Inner PipeODxWT (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 coefficientK=Watt/Meter x Celsius 0.06 ~ 0.08 0.04 ~ 0.06 0.02 ~ 0.04 0.006 ~ 0.02 0.002 ~ 0.006

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