Wells – Processes – Cleaning or unloading well
Patent
1989-08-21
1990-05-08
Novosad, Stephen J.
Wells
Processes
Cleaning or unloading well
166177, 166170, E21B 1206, E21B 3308, E21B 3700
Patent
active
049230115
ABSTRACT:
A wiping tool for free fall in a drill stem is disclosed. The wiping tool is adapted to be dropped in the drill stem to wipe the inner wall. It is constructed with an elongate mandrel terminating at upper and lower subs. The upper sub supports a fishing neck and the lower stub encloses a check valve assembly. Adjustable weight means are affixed to the lower sub. Wiping is accomplished by an elongate sleeve having narrow upper and lower ends slideably mounted on the central mandrel, and said sleeve is enlarged at central portions to a diameter sufficient to wipe the wall of internal upset pipe, and wherein said sleeve is resilient, and is therefore able to reduce in diameter on passing through an internal upset and resiliently restores to the initial diameter after passing through the upset.
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Safe Trip Mud-Slugger, brochure, Houston, Tex., p. 2.
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