API Standard Cementing Tools Hydraulic/Mechanical Stage Cementing Collar, Multi Stage Cementing Collar

This page is going to clarify one of them : Hydraulic stage collar  

Hydraulic  collar  advantage and features 

1-It can only manufactured by SWS in domestic china as one unique tech.  

2- It can be used in horizontal and highly deviated well bores and applications where opening of the stage collar after displacement of the first

stage cementing is required. 

3-The opening pressure can be changed to allow opening of the tool through a wide range of pressures. 

4-The opening free fall trip device is optionally available for use if the stage collar is opened mechanically 

5- When premium thread are using DRK , we recommend to use a landing collar to receive the 1st stage latch down wiper plug.