The bottom connection of the casing head is either an API round box thread or API buttress box thread; it can also be a type connection.
It can be provided with a weld-supporting base plate.
Side outlets could be pipeline thread or studded, studded side outlet is machined with female thread for connecting the R 1.1/2" reversing valve.
| Rated WP | 21MPa、35MPa、70MPa 、105MPa |
| PSL | PSL1、PSL2、PSL3、PSL3G、PSL4 |
| PR | PR1 |
| TC | P、U、L |
| MC | AA、BB、CC、DD、EE、FF |
Single-stage thread type:
It can process all kinds of casing thread and connect with the surface casing through the pin*pin nipple, which is quick and convenient to install. The production casing can be suspended by mandrel or slip.
Split double stage type:
It can hang three layers of casing, the surface casing can be threaded or sliding into welding type, and the technical casing and production casing can be of slip type or mandrel type.
Slip-type bottom connection casing head:
The upper locking screw is used to make the slip tooth clamp the surface casing. And BT-type casing sealing ring is provided, which is firmly connected, convenient and reliable.
Wearing bush
Wearing bush is mainly used to prevent the casing head and the inner cavity sealing surface of the cross from being damaged by drilling tools during drilling operations.
On-going tools
Used to take out the Wearing bush.
Pressure test plug
The pressure test plug is located on the inner shoulder of the casing head spool and tests the tightness of the BOP, drilling spool and casing head through the drill pipe.