Wells – Processes – With indicating – testing – measuring or locating
Patent
1982-12-08
1984-04-03
Novosad, Stephen J.
Wells
Processes
With indicating, testing, measuring or locating
166285, 166187, E21B 3313, E21B 33127
Patent
active
044402260
ABSTRACT:
Disclosed is a method for reducing or preventing migration of a formation fluid from a first earthen formation to a second earthen formation each of which is intersected by a drilled borehole. The method includes running into the borehole, the packer includes a mandrel with an plastic sleeve there about and valve for permitting the flow from the interior of the mandrel into the interior of the sleeve to expand the sleeve against the formation. The method further includes the steps of determining each of the pressures of the formation, the radial shrinkage of the cement within the sleeve, and the maximum pressure which can be exerted by the sleeve on the formation without fracturing same. The method further includes the step of pamping cement down through the casing and mandrel and into the sleeve at a pressure less than the maximum pressure that can be exerted on the formation without fracturing same, but sufficient to resiliently strain the mandrel, sleeve, and formation in an amount sufficiently greater than the shrinkage of the cement during setting to provide a pressure of the sleeve against the form, after the cement has set, greater than the pore press of the formation.
REFERENCES:
patent: 3666011 (1972-05-01), Owens
patent: 3918522 (1975-11-01), Suman, Jr.
patent: 3948322 (1976-04-01), Baker
patent: 4155404 (1979-05-01), Hollingsworth
Neuder William P.
Novosad Stephen J.
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