Top Drive Saver Sub

Top Drive Saver Sub is a kind of sub connected with Lower IBOP and drill pipe, mainly used in the top drive system. Not only acting as crossover sub, but also protecting lower IBOP. Top drive saver sub can be divided into general top drive saver sub and low temperature top drive saver sub.

Specification of Top Drive Saver Sub

Model
OD
mm(inch)
ID
mm(inch)
Conn.
DQA187B
187(7 23/64)
57.2(2 1/4)
6 5/8REG×NC46
DQA187A
187(7 23/64)
71.4(2 13/16)
6 5/8REG×NC50
DQA197B
197(7 3/4)
57.2(2 1/4)
6 5/8REG×NC46
DQA197A
197(7 3/4)
71.4(2 13/16)
6 5/8REG×NC50
DQA219A
219(8 5/8)
71.4(2 13/16)
7 5/8REG×NC50


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