Downhole valve for paraffin control

Details Downhole valve for paraffin control Downhole valve for paraffin control

1975-10-31

1977-03-15

Novosad, Stephen J.

Wells

With eduction pump or plunger

Having sediment trap or deflector

166303, 166304, 166321, E21B 3700, E21B 4300, E21B 4324

Patent

active

040119068

ABSTRACT:
Method and apparatus for removing paraffin deposits from the production tubing of an oil well. A sub is series connected into the production string at a location below the area where deposition of paraffin occurs, and treatment fluid, such as hot water, is pumped downhole towards the inlet end of the string. A spring loaded valve means is located in a lateral flow passageway of the sub and opens when a pre-set tubing pressure is exceeded, thereby enabling the treatment fluid to be forced down the upper production tubing, past the paraffinic deposition, into the sub, through the lateral flow passageway, and into the casing annulus, thereby dissolving the crystalline paraffin so that the production tubing is no longer obstructed with paraffinic deposits.

REFERENCES:
patent: 2300348 (1942-10-01), Dana
patent: 2704979 (1955-03-01), Van Willigen
patent: 3014531 (1961-12-01), Weaver
patent: 3085629 (1963-04-01), Henderson
patent: 3086593 (1963-04-01), Chitwood
patent: 3102590 (1963-09-01), Grounds
patent: 3361205 (1968-01-01), Waldron
patent: 3695365 (1972-10-01), Shadlich
patent: 3712388 (1973-01-01), Curington
patent: 3713490 (1973-01-01), Watson

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