OCTG - Drill Stem SubBack to Products
A sub is a special short length of threaded pipe used to connect drill pipes to drill collars, with a drill pipe connection on one end and a drill collar connection on the other.
reversing sub is also called back off sub or reversing spear , which is a special tool for revering stuck drill stem above stuck point in drilling and work over operation. In treatment of stuck drill stem, reversing sub-back off sub can work as a fishing pin tap in reversing operation.When fish is stuck or can not be reversed in fishing or reversing operation,the fish can be reversed from reversing sub and the fishing drill tool can be tripped out.
When a bit sub is used to convert connectors of different types or sizes, it is called a crossover sub. The sub that connects the drill bit to the last drill collar is the bit sub.
Products are manufactured in accordance with API Spec 7 RP7G as applicable.
There is a wide range of subs available, including:
Straight Crossover Sub (Box/Pin, Box/Box, Pin/Pin)
Bottleneck (reduced section) Sub (Box/Pin, Box/Box, Pin/Box, Pin/Pin)
Crossover Sub with Float Bore (Box/Pin, Box/Box, Pin/Box)
Bit Sub with Float Bore (Box/Box)
Bit Sub without Float Bore (Box/Box)
Top Drive Saver Sub (Pin/Pin)
Kelly Saver Sub without rubber protector (Box/Pin)
Kelly Saver Sub with a stretched on rubber protector (Box/Pin)
Lift Sub (18 deg taper or square shoulder) (None/Pin, Box/Pin)
Lift Plug (None/Pin)
Options:
API Pin Stress Relief Groove and Box Boreback
Cold Rolling
Phosphate Coating
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