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Float subs are used to house a float valve, also known as a back pressure valve. it functions as a safety between the well bore and the inside of the drill string to prevent drilling fluids from back flowing up to surface.
Description: Float subs are used to house a float valve, also known as a back pressure valve. it functions as a safety between the well bore and the inside of the drill string to prevent drilling fluids from back flowing up to surface.
Float Valve Sub is usually connected on the top of the bit to control down hole liquid. While stopping pump and connecting with single, it can prevent waterhole from being plugged by reflowing drillings. When blowout occurs, it can serve as splash valve to prevent liquid flowing into drilling tools.It is divided into plate type float sub and arrow-type float valve sub.
Structure:Float valve sub consists of sub, float valve unit and accessory extractor. While using, float valve unit should be put into joint body. Float valve unit is composed of body, sealed ring, seal gland, valve bonnet, torsional spring and limit marker.
Principle:Working principle of float valve sub is rather simple.When normal drilling and pumping circulation,the bonnet of float valve unit will be opened completely.If well kick or pumping off occurred,the bonnet will close waterhole depends on elastic force of torsional spring.It can prevent blowout in the drilling tool.
Specification of Float Valve Sub
type | Joint O.D.mm | Connection | Float Valve O.D.mm | I.D.mm |
FFJT241 | 241.3 | 7 5/8 REG | ф121 | ф76 |
FFJT228 | 228.6 | 7 5/8 REG | ф121 | ф76 |
FFJT209 | 209.6 | 6 5/8 REG | ф121 | ф76 |
FFJT203 | 203.2 | 6 5/8 REG | ф121 | ф71 |
FFJT178 | 177.8 | 4 1/2 IF | ф98 | ф71 |
FFJT165 | 165.1 | 4 1/2 REG | ф88 | ф57 |
FFJT146 | 146 | 4 1/2 REG | ф88 | ф57 |
FFJT121 | 121 | 3 1/2 REG | ф61 | ф51 |
FFJT108 | 108 | 3 1/2 REG | ф61 | ф38 |