Wells – Processes – Cementing – plugging or consolidating
Patent
1986-02-19
1987-03-31
Novosad, Stephen J.
Wells
Processes
Cementing, plugging or consolidating
166290, 166177, F21B 3314
Patent
active
046535870
ABSTRACT:
A method and apparatus for forming an annulus around the outer wall of a well casing to provide a good impervious seal around such casing which is particularly useful where the casing is installed in a porous earthen formation. A first batch of cement is fed down to the bottom of an oil well casing and out the bottom thereof so that it rises up along the wall of the casing to form an annulus between the casing and the earthen formation in which it is installed. While the cement is being fed and thereafter, the casing is continually vibrated with sonic energy preferably at a frequency which sets up resonant standing wave vibration of the casing. When a layer of the cement has risen to a predetermined level, the feeding of the cement is interrupted but the sonic energization of the well casing continued. After a sufficient time has been allowed for initial hardening of the cement in the surrounding formation a second batch of cement is poured, the second batch of cement flowing further up along the pipe through the fluidized immediately adjacent to the casing and being prevented from entering the porous formation by virtue of the portion of the previously poured cement which has sealed off the lower portions of the formation. Pouring of cement is thus continued in successive interrupted steps or relatively slowly until a sealing annulus of cement reaches the surface.
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Bagnell David J.
Novosad Stephen J.
Sokolski Edward A.
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