Casing connections (ОКК1, ОКК2, ОКК3) are designed for connections of protective and casing strings, capsulation and pressure control in space between them.
Protective string is supported with slip-type tubing catchers. Connections is equipped with wall packers that enables pressurizing flange coupling of body frames of casing head and casing connections.
Technical characteristics
| typical layout | ОКК1 | ОКК2 | ОКК3 |
| Operating pressure, MPa (psi) | 14 (2000) 21 (3000) 35 (5000) |
21 (3000) 35 (5000) |
70 (10000) |
| Nominal diameter of casing, mm | 140, 146, 168, 219, 245 | 140, 146, 168, 219, 245, 299, 324 | 140, 146, 168, 219, 245, 299, 324, 426 |
| Weight, kg | 350 500 550 |
1050 1500 |