Drag spring unit

Details Drag spring unit Drag spring unit

E - Fixed Constructions

21

B

166/27

E21B 23/04 (2006.01) E21B 33/127 (2006.01)

Patent

CA 1167371

ABSTRACT OF THE DISCLOSURE An improved drag string unit is shown for use with well bore drill stem test tools of the type which have an inflatable packer and an integral pump. The drag spring unit has an outer drag spring housing and an inner man- drel slidably received within the drag spring housing. Ratchet surfaces associated with the outer housing and inner mandrel are positionable between an engaged posi- tion which allows the pump to be activated to pump up the packers and a disengaged position which prevents activation of the pump. Vent means are alignable be tween the inner mandrel and outer housing when the rat- chet surfaces are disengaged allowing the packers to vent to the well bore.

399815

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