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Reversing Spears

 

 

REVERSING SPEARS

There is another kind of spear which is called reversing spear, a counter clockwise thread for tool joint at the upper part of the spear body, while the expansion sleeve has clockwise thread. The guide cone at the lower part can make the expansion sleeve of the spear conveniently screw the fish connection. Raising the drilling tool, the expansion sleeve can hold the fish firmly, then reversing.

 

Technical Specifications and parameters

 

Type

OD (mm)

API Thread

Catch Size (mm)

DRS-48

95

NC26

39.7-41.9

DRS-60

105

NC31

49.7-51.9

DRS-73

105

NC31

61.5-78

DRS-89

121

NC38

75-91

DRS-102

121

NC38

88.2-102.8

DRS-114

121

NC38

99.8-103

DRS-127

127

NC38

107-116

DRS-140

140

NC38

118-128

DRS-178

178

NC50

153-166

 


The reversing spear in reversing operation owns two functions which can go fishing and transfer left-hand torque at the same time. It is a special internal fishing and reversing tool which can replace left-hand taper tap.