1994-03-03
1995-10-31
Tsay, Frank S.
Wells
Wiper
166319, 1663331, 417 60, E21B 4325, F04B 4712
Patent
active
054621151
ABSTRACT:
A swab is movably mounted within a well casing and automatically removes fluid from the well upon accumulated pressure at the bottom of the casing reaching a predetermined amount to raise the swab within the casing. The swab has a hollow body with an inner cylindrical bore. A control rod is slidably mounted within the bore and has a cross-sectional configuration whereby only a plurality of sliding contact lines occur between the rod and bore wall to reduce rod hangup and provide increased flow area between the rod and bore wall. A fluid inlet port is formed by an open bottom end of the swab body and is open and closed by a valve member located external of the swab body. The valve member has a generally pointed nose to reduce drag when the swab is descending into the casing, and upon contact of the nose with a stop at the bottom of the well casing, will automatically move to a closed position with the fluid inlet port. A pressure relief valve is mounted in the swab body and automatically opens upon the internal fluid lift pressure in the well casing reaching a predetermined amount to permit the pressure to equalize through the bore to prevent damage to elastomeric seals which surround the swab body.
REFERENCES:
patent: 2714855 (1955-08-01), Brown
patent: 2762310 (1956-09-01), Eklund
patent: 2850339 (1958-09-01), Vincent
patent: 2970547 (1961-02-01), McMurry
patent: 3249056 (1966-05-01), Lyles
patent: 4986727 (1991-01-01), Blanton
patent: 5253713 (1993-10-01), Gregg et al.
Belden Steven V.
Belden, Jr. Dennis D.
Corp John G.
Belden & Blake Corporation
Tsay Frank S.
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