Float valve is one of necessary tool for oil drilling, it consists of float valve sub and float valve, the main function is to prevent mud brings drill cuttings,sediment backfilling which will cause bit bore blocked when connecting each joint. When the well blowout or kick, the valve cover of float valve turn off the bore automatically, it will prevent well blowout accident.
| Модель | FV OD мм (мч) | FV OAL mm(inch | BFF OD mm(inch | Tool Joint Box Connections and BBF Depth | |||||||||
| Connection API | BBF Depth mm (mch) | Connection API | BBF | Depth mm (mch) | |||||||||
| 1R 42.07(1-21/32) 149.2(5-7/8) 42.86(1-11/16) 2-3/8REG 231.8(9-1/8) NC23 231.8(9-1/8) | |||||||||||||
| 1F-2R 48.42(1-29/32) 158.8(6-1/4) 49.21(1-15/16) 2-7/8REG 254(10) 2-3/8 IF 241.3(9-1/2 | |||||||||||||
| 2F-3R 61.12(2-13/32) 165.1 (6-1/2) 61.91(2-7/16) 3-1/2REG 266.7(10-1/2) 2-7/8 IF 260.4(10-1/4 | |||||||||||||
| 3F 71.44(2-13/16) 254(10) 72.23(2-27/32) 3-1/2 FH 355.6(14) | |||||||||||||
| 3-1/2IF 79.38(3-1/8) 254(10) 80.17(3-5/32) 3-1/2 IF 362(14-1/4) | |||||||||||||
| 4R 88.11(3-15/32 211.1(8-5/16 88.9(3-1/2) 4-1/2REG 325.4(12-13/16) NC44 331.8(13-1/16) | |||||||||||||
| 4F 92.87(3-21/32) | 304.8(12) | 93.66(3-11/16) —- 4 IF 425.4(16-3/4) | |||||||||||
| 5R 98.43(3-7/8) 247.6(9-3/4) 99.22 (3-29/32) 5-1/2REG 374.7(14-3/4) 4-1/2 IF 368.3(14-1/2 | |||||||||||||
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5F-6R | 121.44(4-25/32) 298.4(11-3/4) 122.24(4-13/16) 6-5/8REG 431.8(17) 5-1/2 IF 431.8(17)
—- 8-5/8REG 441.3(17-3/8) NC61 444.5(17-1/2) | ||||||||||||
| 6F 144.46(5-11/16) 371.5(14-5/8) 145.26(5-23/32) 8-5/8REG 514.4(20-1/4) 6-5/8 IF 504.8(19-7/8) | |||||||||||||