Stage Collar


Stage collar is a mechanical tool used to complete the cementing operation into two times. Stage collar mainly consists of two-stage coupling (body), first-stage plug, baffle plate, free fall opening plug (it is used when you use the non-continuous process) or pump-down opening plug (it is used when you use the continuous process), closing plug
1. It uses out-closing structure and locking device on the closing sleeve. The lock is reliable after the closing.
2. The liquid would not occur in the loculum when opening or closing.
3. The I.D. of upper/lower sub should be the same as that of casing, it can protect the body of stage collar from damaging when the bits going down and doing drill-out operation.
4. All the accessories are made of drillable rubber or aluminum material. They have the function of anti-rotation, and can make the drill out easy.
5. You can use the pumping-down plug to carry out continuous process.
Technical Parameters:
Specifications, (in) 5 1/2″ 7″ 9 5/8″ 13 3/8″
Max O.D., mm Φ170 Φ208 Φ283 Φ381
Drill-out I.D., mm Φ122 Φ155 Φ220 Φ315
Overall Length, mm 1082 1182 1222 1280
Rated Load, t 140 170 210 300
Sealing capacity, MPa 25 25 25 25
Opening Pressure, MPa 13 13 13 14
Closing Pressure, MPa 5 5 5 5
Lower Sliding Sleeve I.D., mm Φ85 Φ115 Φ176 Φ203
Upper Sliding Sleeve I.D., mm Φ95 Φ125 Φ197 Φ285