A distinctive feature of this equipment is a single nominal bore for the entire assembly of housings, equal to the nominal bore of the upper flange, due to which there is no reinstallation of the blow out preventer (BOP) when drilling for each string and running of the tubing strings, since the above operations are performed in one BOP installation.
The presence of casing hangers of the "daisy" type (with grooves for the exit of drilling mud) allows to install the sealing of the tubing hanger immediately after cementing the casing string, and immediately begin drilling for the next casing string without waiting for the cement to harden and reinstallation of the BOP. This feature of the equipment allows you to significantly speed up the drilling process and reduce the time for development of the well.
If necessary, classic wedge hangers are also supplied in the spare parts kit, and after disassembling the equipment body, you can use it as a regular casing head and as a regular tubing head.
| Mpa | 14 | 21 | 35 | 70 |
| Psi | 2000 | 3000 | 5000 | 15000 |
| mm | 60 | 73 | 89 | 102 | 114 | 127 | 140 |
| inches | 2⅜ | 2⅞ | 3½ | 4 | 4½ | 5 | 5½ |
API temperature classes: K, L, P, R, S, T, U
Available in material versions K1, K2, K3 according to GOST 13846-89 and AA, BB, СС, DD-NL, EE-NL, FF-NL, HH-NL according to API
Spec 6A.
Advantages relative to classic casing heads:
- Drilling and running of all strings (technical, production, tubing) is carried out from one BOP installation on the tubing head body.
- The well is always under control;
- Absence of intermediate reinstallations of BOP - time savings when drilling approximately 48 hours per well;
- No waiting on cement is required when cementing casing strings - time savings of approximately 96 hours per well.
