Use of degradable ball sealers to seal casing perforations in we

Details Use of degradable ball sealers to seal casing perforations in we Use of degradable ball sealers to seal casing perforations in we

1986-12-10

1988-01-05

Novosad, Stephen J.

Wells

Processes

Fluid flow causes pellet to block opening in wall of conduit

166278, 166307, 166308, 528354, E21B 3310, E21B 4325, E21B 4326

Patent

active

047169648

ABSTRACT:
Plugging perforations in casing in a wellbore penetrating a subterranean formation using degradale ball sealers. The ball sealer used is composed of a polyester polymer which is substantially insoluble in the wellbore fluid. The polymer degrades in the presence of water at an elevated temperature to form small molecules which are soluble in a fluid in the subterranean formation. After the polymer degrades, the flow through the perforation returns to substantially its initial value.

REFERENCES:
patent: 2362511 (1944-11-01), Teeters
patent: 2758987 (1956-08-01), Salzberg
patent: 3457280 (1969-07-01), Schmitt et al.
patent: 3636956 (1972-01-01), Schneider
patent: 3839297 (1974-10-01), Wasserman et al.
patent: 4102401 (1978-07-01), Erbstoesser
patent: 4195690 (1980-04-01), Erbstoesser
patent: 4273920 (1981-06-01), Nevin
patent: 4387769 (1983-06-01), Erbstoesser et al.

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