Model YFZ-A Mechanical Stage Collar 
Model YFZ-A Mechanical Stage Collar
Features /
1.The circulation ports are opened by dropping a free-fall opening plug.
2.High strength retaining blocks prevent pre-mature closing and offer reliable performance even in deep wells.
3.Anti-rotation mechanism improves drill-out efficiency.
Technical Parameters /

Size

Sealing capacity

Casing weight

Opening pressure

Closing pressure

in

mm

MPa

lb/ft

mm

MPa

MPa

5 1/2

139.7

35/50

17.00

7.72

7

5

20.00

9.17

7

177.8

35/50

26.00

9.19

29.00

10.36

32.00

11.51

35.00

12.65

7 5/8

193.7

35/50

29.70

9.52

33.70

10.92

39.00

12.70

9 5/8

244.5

35/50

40.00

10.03

43.5

11.05

47.00

11.99

53.50

13.84

10 3/4

273

35

55.50

12.57

60.70

13.84

13 3/8

339.7

35

68.00

12.19

5

5