Stage Collar is stage cementing distributor,Mainly used to multistage well cementing process. From multistage cementing to get the good results, sloving the difficulties of cement upward going in deep well,poor cementing quality problems.
1.Excessive cementing in one time.
2.Stratum can not bear too much pressure liquid column.
3.Packer special layers;
4.Preventing annular channeling after cementing.
5.large temperature difference between isolation section, the performance of the grout is not easy to adjust.
Type:
-Mechanical Stage Collar
-Hydraulic Stage Collar
-Free-drilling stage collar

MECHANICAL STAGE COLLAR

- Short body, Complete stress is small.
- Special bypass design solving the liquid compression between opening dart and closing plug.
- Lock ring design ensures permanently closed after completion.