Drag spring unit

Details Drag spring unit Drag spring unit

1981-06-29

1983-10-25

Purser, Ernest R.

Wells

Packers or plugs

Expanded by confined fluid from central chamber, pump or...

166237, 166241, 166334, E21B 2304, E21B 2306

Patent

active

044113153

ABSTRACT:
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 mandrel slidably received within the drag spring housing. Ratchet surfaces associated with the outer housing and inner mandrel are positionable between an engaged position 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 between the inner mandrel and outer housing when the ratchet surfaces are disengaged allowing the packers to vent to the well bore.

REFERENCES:
patent: 2549198 (1951-04-01), Hayward
patent: 3439740 (1969-04-01), Conover
patent: 3572450 (1971-03-01), Thompson
patent: 3876000 (1975-04-01), Nutter
patent: 4246964 (1981-01-01), Brandell

Affiliated with

Also associated with

Rating

Drag spring unit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Drag spring unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Drag spring unit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-707589