PVDF Encapsulated Control Line Duplex Stainless Steel Capillary
Tubing
Meilong Tube manufactures either welded or seamless hydraulic
control lines for subsurface applications. Hydraulic control line
is available in mainly five materials, varying wall thicknesses,
and a wide range of working pressure ratings. The line is supplied
on spools to exact length requirements. Upon request, it is
pressure tested hydraulically, purged with nitrogen gas, or clean
oil liquid, and sealed on both ends prior to shipping.
Welded hydraulic control line is floating plug drawn to ASTM
specifications and is available in any length. Material types for
hydraulic control lines include stainless steel TP316L which is
suitable for sweet to moderately corrosive environments, Duplex
stainless steel 2205, Super Duplex stainless steel 2507, nickel
alloy Incoloy 825 and Inconel 625 are suitable for severely
corrosive environments and high working pressures and temperatures.
Control system fluids must be compatible with the environments and
operating temperatures of the control line.
Control line encapsulation also is available, where requested, to
provide additional crush and abrasion resistance during
installation. The encapsulation material should be matched for
compatibility with well fluids and temperature requirements.
Encapsulated Control Line
MEILONG offers the encapsulation of control lines to provide
increased durability, as well as chemical and corrosion resistance
to meet each project’s specialized requirements, we offer different
encapsulation types, such as: HDPE (High Density Polyethylene),
Santoprene, PVC (Polyvinyl Chloride), Haylar and PVDF
(Polyvinylidene Fluoride).
Flatpacks are commonly used when several different lines are
terminated at approximately the same depth in the well.
Common applications include intelligent well systems, deep-set
chemical injection lines with downhole gauge cable and safety valve
lines with shallow set chemical injection lines. For some
applications bumper bars are also encapsulated into the flatpack to
provide additional crush resistance.
Standard & Approvals
Control Lines are manufactured according to applicable ASTM
standards for each specific material.
Tubes can be supplied flushed, filled, and filtered per client
requirements and to the appropriate NAS/SAE standards.
Quality & Testing
- Manufactured in accordance with Standard Inspection and Quality
Plans
Design & Construction
- Encapsulation for single line
- Encapsulation profiles to suit customer application
- Custom Line Marking
- Full range of application materials
Encapsulation Materials
- PP (Polypropylene) /TPR (Santoprene) / PA
(Nylon) / PVDF / ETFE (Tefzel) / ECTFE (Halar)
FEP / PFA / ECA 3000
Features of Encapsulated Control Line
Maximize protection of downhole line
Increase crush resistance during installation
Protect control line against abrasion and pinching
Eliminate long term stress corrosion failure of control line
Improve clamping profile
Single or multiple encapsulation for ease of running and added
protection
Available Alloy Grades for Control Line Tubing Inside Encapsulation
| Austenitic: | 316L |
| Duplex: | S31803/S32205 S32750 |
| Nickel alloy: | N08825 N06625 |
Standard Encapsulation Profiles
| Round, Single Line | Item | Standard Dimensions |
 | 1/8’’ OD Line | 0.250’’ (6.35 mm) Dia. |
| 1/4’’ OD Line | 0.433’’ (11.0 mm) Dia. |
| 3/8’’ OD Line | 0.535’’ (13.6 mm) Dia. |
| 1/2’’ OD Line | 0.660’’ (16.8 mm) Dia. |
| Square, Single Line | Item | Standard Dimensions |
 | 1/8’’ OD Line | 0.250’’ x 0.250’’ (6.35 mm x 6.35 mm) |
| 1/4’’ OD Line | 0.433’’ x 0.433’’ (11.0 mm x 11.0 mm) |
| 3/8’’ OD Line | 0.535’’ x 0.535’’ (13.6 mm x 13.6 mm) |
| 1/2’’ OD Line | 0.660’’ x 0.660’’ (16.8 mm x 16.8 mm) |
| Rectangular, 2 Lines | Item | Standard Dimensions |
 | 1/4’’ OD Line | Width: 0.710’’ (18.0 mm) Height: 0.410’’ (10.4 mm) |
| Rectangular, 3 Lines | Item | Standard Dimensions |
 | 1/4’’ OD Line | Width: 0.990’’ (25.1 mm) Height: 0.410’’ (10.4 mm) |
