The encapsulation of downhole components such as Hydraulic Control Lines, Single Line Encapsulation, Dual-Line Encapsulation (FLATPACK), Triple-Line Encapsulation (FLATPACK) has become prevalent in downhole applications. The overlaying of plastic provides several benefits that help to ensure a successful completion.
Encapsulation provides a protective layer to keep the lines from being scratched, dented, and possibly crushed while running in hole.
Encapsulation of several components (Flat Pack) provides a consolidation that will help reduce equipment and personnel that is needed to deploy multiple single components. In many cases, a flat pack is mandatory as rig space can be limited.
Encapsulation keeps from metal to metal contact.
Encapsulation can provide protection to underlying components while in hole such as a lines that can be across a sand face or possibly in contact with a high rate of gas.
Incoloy 825 |
||||||||||
Nickel |
Chromium |
Iron |
Molybdenum |
Carbon |
Manganese |
Silicon |
Sulfur |
Aluminum |
Titanium |
Copper |
% |
% |
% |
% |
% |
% |
% |
% |
% |
% |
% |
|
|
min. |
|
max. |
max. |
max. |
max. |
max. |
|
|
38.0-46.0 |
19.5-23.5 |
22.0 |
2.5-3.5 |
0.05 |
1.0 |
0.5 |
0.03 |
0.2 |
0.6-1.2 |
1.5-3.0 |
Norm Equivalence |
|||
Grade |
UNS No |
Euro norm |
|
No |
Name |
||
Alloy |
ASTM/ASME |
EN10216-5 |
EN10216-5 |
825 |
N08825 |
2.4858 |
NiCr21Mo |
ASTM B704 / ASME SB704, Incoloy 825, UNS N08825, Inconel 625, UNS N06625 | ||
ASTM B751 / ASME SB751 | ||
Size OD | Tolerance OD | Tolerance WT |
1/8’’≤OD<5/8’’ (3.18≤OD<15.88 mm) | ±0.004’’ (±0.10 mm) | ±12.5% |
5/8≤OD≤1’’ (15.88≤OD≤25.4 mm) | ±0.0075’’ (±0.19 mm) | ±12.5% |
Meilong Standard | ||
Size OD | Tolerance OD | Tolerance WT |
1/8’’≤OD<5/8’’ (3.18≤OD<15.88 mm) | ±0.004’’ (±0.10 mm) | ±10% |
5/8≤OD≤1’’ (15.88≤OD≤25.4 mm) | ±0.004’’ (±0.10 mm) | ±8% |
ASTM B423 / ASME SB423, Incoloy 825, UNS N08825 | ||
Size OD | Tolerance OD | Tolerance WT |
1/8’’≤OD<3/16’’ (3.18≤OD<4.76 mm) | +0.003’’ (+0.08 mm) / -0 | ±10% |
3/16≤OD<1/2’’ (4.76≤OD<12.7 mm) | +0.004’’ (+0.10 mm) / -0 | ±10% |
1/2’’≤OD≤1’’ (12.7≤OD≤25.4 mm) | +0.005’’ (+0.13 mm) / -0 | ±10% |
Meilong Standard | ||
Size OD | Tolerance OD | Tolerance WT |
1/8’’ ≤OD<3/16’’ (3.18≤OD<4.76 mm) | +0.003’’ (+0.08 mm) / -0 | ±10% |
3/16≤OD<1/2’’ (4.76≤OD<12.7 mm) | +0.004’’ (+0.10 mm) / -0 | ±10% |
1/2’’≤OD≤1’’ (12.7≤OD≤25.4 mm) | +0.004’’ (+0.10 mm) / -0 | ±8% |
Alloy |
O.D. |
W.T. |
Yield Strength |
Tensile Strength |
Elongation |
Hardness |
Working Pressure |
Burst Pressure |
Collapse Pressure |
inch |
inch |
MPa |
MPa |
% |
HV |
psi |
psi |
psi |
|
|
|
min. |
min. |
min. |
max. |
min. |
min. |
min. |
|
Incoloy 825 |
0.250 |
0.035 |
241 |
586 |
30 |
209 |
7,627 |
29,691 |
9,270 |
Incoloy 825 |
0.250 |
0.049 |
241 |
586 |
30 |
209 |
11,019 |
42,853 |
12,077 |
Incoloy 825 |
0.250 |
0.065 |
241 |
586 |
30 |
209 |
15,017 |
58,440 |
14,790 |