Tubing Encased (TEC) High-Temperature Cable
Prysmian Downhole Technology's Tubing Encased High-Temperature Cable (TEC) is designed and manufactured to withstand the harsh environments of the oil and gas industry at temperatures above 150 °C. The cable can be used for data transmission, such as downhole gauge applications, as well as for larger cores that require power, or a combination of both.
Construction
- Temperature ranges up to 260°C
- Outer tube is tig-welded and drawn through a die to the final size
- Centralized conductor
- Application Specific
- Double Extruded Filler
- Optional Bumper Bars
- Custom Line Marking
- Safety-Strip® Encapsulation
- Continuous Length up to 100,000 ft
Outer Tube Materials
- 316L Stainless Steel (UNS 31603)
- A825 Alloy (UNS N08825)
Outer Tube Sizes: 1/8" to 3/8"
Double Extruded Centralized Core
- Size: 4 AWG - 28 AWG
- Type: Solid or Stranded Copper Conductor
- Plating (if required): Tin, Nickel, or Silver plating
Encapsulation
- ETFE (Tefzel) /ECTFE (Halar) / FEP / PFA / ECA 3000
- Round or Square profile
Pressure Rating
- 1/8" up to 25Kpsi
- 1/4" up to 25Kpsi
- 3/8" up to 20Kpsi
Application
The selection of materials for the insulation and secondary extrusion, as well as the outer tube material and wall thickness, enables the high-temperature TEC to operate at higher pressures than the standard TEC.
Standards and Approvals
Advanced Well Equipment Standard Group AWES Recommended Practice for Qualification of Tubing Encapsulated Conductor AWESTEC_01
Quality and Testing
Manufactured in accordance with standard Inspection and Quality Plans. Downhole cables are manufactured according to applicable ASTM standards for each specific material:
- Alloy 825: ASTM B704 and B751
- Stainless Steel 316L: ASTM A450 and A632
The pressure ratings of TEC are based on the collapse pressure of the ¼” tube, not burst pressures normally associated with capillary tubes. The collapse (yield) pressure is calculated using API Bulletin 5C3 Formula # 1 - Yield Strength Collapse Pressure Formula.