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
HYDRAULIC STAGE COLLAR
-Minimum volume and easy drilling parts design
-Special bypass design solving the liquid compression between opening dart and closing plug.
-Lock ring design ensures permanently closed after completion.
FREE DRILLING STAGE COLLAR
1.Down connector
2.Hollow plug(hardness better than flexibility plug, better isolation)
3.sealing canister
4.flexibility plug seat(Used with special flexibility plug ,driving hollow plug downwarding and scraping the wall)
5.down fixture block(Avoiding the hollow plug downwarding in advance)
6.noumenon
7.lock ring(avoiding circulation port reopen)
8.opening seat(coordinate to opening plug)
9.Sliding sleeve(closing circulation port)
10.snap ring(pushing sliding sleeve close)
11.up fixture block(pushing snap ring)
12.closing seat(coordinate to shut-off plug)
13.middle sliding sleeve
14.up connector
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