Back-off Sub

Back-off sub is also called back off spear. It can instead of taper tap to fish or back off when dealing with sticking. If the fish stuck or can’t be back off, we can release from the back off sub, and then trip the drilling tool.

Type	OD mm(inch)	Conn.	ID	OAL mm(inch)
ZDK105	105(4-1/8)	NC31B LH×NC31P	15(19/32)	580(22-13/16)
ZDK121	121(4-3/4)	NC38B LH×NC38P	22(57/64)	628(24-3/4)
ZDK159	159(6-1/4)	NC50B LH×NC50P	28(1-1/8)	690(27-3/16)
ZDK165	165(6-1/2)	NC50B LH×NC50P	28(1-1/8)	690(27-3/16)
ZDK168	168(6-5/8)	NC50B LH×NC50P	28(1-1/8)	690(27-3/16)
ZDK178	178(7)	6-5/8REGB LH×6-5/8REP	32(1-1/4)	700(27-9/16)
ZDK203	203(8)	6-5/8REGB LH×6-5/8REP	35(1-3/8)	723(28-1/2)

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