The hydraulic stage cementer(included drilling free type) which is mainly used for horizontal well features inner closing structure, opened through pressure difference.  Finally the closing plug drives the closing sleeve down and then shuts the circulation ports.   
    Features：1.Opening pressure can be adjusted
              2.Special structure can minimize the damages to the closing-sleeve
              3.The cementer is designed with anti-rotating structure for easy drillout

 
         Property Parameters
 

Specifications（mm）	Φ139.7（4"）～Φ244.5（9"）
Max O.D.（mm）	170～283
Drill-out I.D.（mm）	124～220.5
Overall length（mm）	1038～1222
Rated load（t）	120～210
Sealing capacity（MPa）	25
Opening pressure（MPa）	17～18
Closing pressure (MPa)	5
Lower sliding sleeve I.D.(mm)	85～176
Upper sliding sleeve I.D.(mm)	95～197