Wells – Processes – Cleaning or unloading well
Patent
1993-05-27
1994-12-13
Britts, Ramon S.
Wells
Processes
Cleaning or unloading well
166373, 166331, E21B 3700
Patent
active
053721977
ABSTRACT:
A tubing unloader for draining liquid from production tubing in an oil well. The tubing unloader has a hollow throughbore so as to form a part of the production tubing until it is necessary to drain the production tubing. The tubing unloader has two basic parts which telescopically cooperate to close or open drain holes in the tubing unloader. The bottom portion of the tubing unloader is a hollow cylinder configured as an outer mandrel body having a pair of J-slots formed on an internal surface. The top portion of the tubing unloader is a hollow cylinder configured as an inner mandrel having a pair of J-lugs protruding from its external surface. The inner mandrel includes a sliding valve and is telescopically received in the outer mandrel body in slide fit relationship with the J-lugs slidingly engaged in the J-slots. Selective manipulation of the tubing unloader allows the operator to drain the production tubing as well as to impart sharp, downwardly or upwardly directed forces on the tubing unloader as a mechanism for releasing a tubing anchor.
REFERENCES:
patent: 3385371 (1968-05-01), Berryman
patent: 3610337 (1971-10-01), Lewis
patent: 4333530 (1982-06-01), Armstrong
patent: 4391326 (1983-07-01), Greenlee
patent: 4590998 (1986-05-01), Hopper
patent: 4637471 (1987-01-01), Soderberg
patent: 4640363 (1987-02-01), Taylor
patent: 4909326 (1990-03-01), Owen
patent: 4944349 (1990-07-01), Van Gonten, Jr.
Britts Ramon S.
GCW Development
Tsay Frank S.
Young J. Winslow
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