Squeeze cementing method for wells

Details Squeeze cementing method for wells Squeeze cementing method for wells

1992-11-16

1994-07-26

Neuder, William P.

Wells

Processes

Providing porous mass of adhered filter material in well

166295, E21B 3314

Patent

active

053320379

ABSTRACT:
Perforation tunnels and other voids or spaces in earth formations in communication with wells are sealed more effectively by injecting and pre-packing resin-coated particulates (sand) into such tunnels or voids and allowing the sand to consolidate to form a substantially rigid, permeable mass. A lead slurry of relatively fine grained cement is then injected to fill the interstices formed in the permeable material occupying the tunnels or voids. A larger or more coarse grain cement is then injected to form a substantially impermeable, rigid filter cake at the interface of the wellbore and the permeable mass to prevent loss of cement slurry out of the tunnels or voids before the cement is set. Vertical and deviated or generally horizontal wellbores having perforation tunnels or voids which suffer unwanted cement drainage prior to setting of conventional oil well cements are more effectively sealed by the sequential injection of the permeable material followed by injection of settable cement slurries.

REFERENCES:
patent: 2986538 (1961-05-01), Nesbitt et al.
patent: 4917188 (1990-04-01), Fitzpatrick, Jr.
patent: 5121795 (1992-06-01), Ewert et al.
patent: 5211234 (1993-05-01), Floyd

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