Wells – Processes – With indicating – testing – measuring or locating
Patent
1985-03-06
1987-04-07
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166179, 166304, 166387, E21B 3312, E21B 3313
Patent
active
046552855
ABSTRACT:
A plug for use in reducing paraffin deposits inside a production tubing string within a casing is slidably received on one of the production string tubing joints and supported on a tubing string collar. The outside diameter of the plug is smaller in diameter than the drift diameter of the casing to provide an annular space therebetween. When hot oil is pumped down the annulus between the tubing and the casing during a hot oil treatment, this plug restricts flow of the hot oil by allowing the oil to pass through the annular space between the plug and the casing and through a series of circumferentially spaced apertures through the body. The reduced flow rate increases contact time to produce the maximum heat transfer between the hot oil and the tubing, rods, and fluid inside the tubing. The paraffin melts and is produced along with the well fluids. The apertures allow passage of pressurized gases from the annulus below the hot oil plug to the annulus above the hot oil plug to prevent gas locking and reduced production through the production tubing. The plug may also have a plurality of circumferentially spaced check valves in place of, or in combination with the apertures to allow passage of the pressurized gases.
REFERENCES:
patent: 2057966 (1936-10-01), Parrish
patent: 2300348 (1942-10-01), Dana
patent: 2999540 (1961-09-01), Bodine, Jr.
patent: 3361205 (1968-01-01), Waldron
patent: 3424249 (1969-01-01), Hamby, Jr. et al.
patent: 3456734 (1969-07-01), Dean et al.
patent: 3957108 (1976-05-01), Van Huisen
Goodwin Michael A.
Mosely Neal J.
Novosad Stephen J.
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