Free drill-out stage collar

  • The operating process is the same as regular stage collar
  • When the closing plug runs onto the closing seat, pump to the recommended pressure to shear the pins. The assembly of the closing plug and seat would free-fall to the bottom of the borehole under the gravity effect to get rid of the drill-out
  • It is suitable for vertical wells


Mainly specification
Size(in) 5-1/2" 7”
Length,mm 1225 1320
MAX.O.D,mm 168 210
Opening pressure,MPa 6-8 6-8
Closing pressure,MPa 8-10 8-10
Open sleeve I.D,mm 87.31 114.3
Drill-out I.D,mm 123.03 157.48
Length of closing plug,mm 267 273
MAX. O.D of closing plug,mm 130 160
Length of opening plug,mm 312.74 381
Length of first stage plug,mm 391.32 422.26
MAX.O.D of first stage plug,mm 139.7 173.83
Shut-off baffle I.D,mm 71.12 77.44
Shut-off baffle O.D,mm 153.67 200.03
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