Seamless Tubing with External Upset Ends and Couplings Hydrosulfite and Cold-Resistant
TU 1308-206-0147016-01
The tubing per this TU is meant for regular operation in corrosive hydrosulfide media with parameters specified in Table 5 "Safety Regulations for Petroleum and Gas Industries". Besides, the tubing has enhanced corrosion resistance at well treating with hydrochloric acid and is cold-resistant up to temperature -50°C.The general corrosion rate for tubing metal is not more than 0.5 mm/year.
The tubes are manufactured with strength group Es with range as per GOST 633-80.
The range of tubes, subs and couplings is specified by Table 1.
| Tube type | Outside Diameter mm | Tube wall thickness, mm | Strength group |
| With Externally Upset Ends (NKV) as per GOST 633-80 | 73,0 89,0 | 5,5 : 7,0 6,5 : 8,0 | Es |
In coordination with client the tubes can be manufactured with the length up to 11 meters.
The tubes are manufactured from tube shell made from steel 30 KhMBFA.
Mechanical properties of tubes and couplings are specified by Table 1.1.
Parameter description | Strength group |
Tensile strength, σt, | 657 (67) |
Yield strength, σy, | 549 (56) |
Ratio σy/σt, | 0,9 |
Rockwell hardness, | 98 HRB |
Elongation, δ5, %, | 16 |
Impact strength at Charpy specimens, | 98(10) |
Share of ductile component (V) at | 70 |
Table 5 from "Safety Regulations for Petroleum and Gas Industries"
Produced fluid type | Hydrogen sulfide concentration, | Pressure abs., Pa (atm) |
Humid gas or watery (with traces of water) oil with gas factor above 890 Nm3/m3 | up to 0.075 (up to 1.15) | PH2S > 345 (352х10^-5) |
Humid gas or watery (with traces of water) oil with gas factor less than 890 Nm3/m3 | up to 0.02 (up to 0.31) | PH2S > 345 (352х10^-5) Рsum> 1,83х10^6 (18,6) PH2S > 6,9х10^4 (0,7) |
