Wells – Processes – Cleaning or unloading well
Patent
1996-09-04
1998-07-21
Schoeppel, Roger J.
Wells
Processes
Cleaning or unloading well
166154, 1663343, 166373, E21B 2100
Patent
active
057823030
ABSTRACT:
An apparatus which includes an external housing (10) and a slotted internal sleeve (26) machined from cylindrical lengths of hollow metal pipe stock, and one or more partially-hollowed-out plug screws (16). This apparatus uses no seals or O-rings. The apparatus is attached between a tubing string of a well and a big bore pump. When activated, the apparatus permits fluids to drain from well tubing. The apparatus has only one moving part and is activated by pulling upward on sucker rods of a well, an action which causes the top of a big bore pump plunger to make contact with the sleeve and move the sleeve upward within the housing. The sleeve is secured inside the housing by one or more partially-hollowed-out plug screws which are sheared when the contact is made, exposing at least one opening. The opening in the sleeve aligns with the hole in the partially-hollowed-out plug screw caused by the shearing. The alignment of the opening allows fluid to drain from inside a tubing string into the casing of a well when the tubing string is pulled from a well. The apparatus remains attached between the tubing string and the big bore pump and is retrieved when the tubing string and pump are pulled to the surface.
REFERENCES:
patent: 3752230 (1973-08-01), Bernat et al.
patent: 4103739 (1978-08-01), Hall
patent: 4519457 (1985-05-01), Holland et al.
patent: 4624307 (1986-11-01), Kinley et al.
patent: 5018581 (1991-05-01), Hall
patent: 5372197 (1994-12-01), Wacker
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