Sealing wells

Details Sealing wells Sealing wells

1975-03-03

1978-08-29

Padgett, Benjamin R.

Compositions

Leather or fur treating

166292, 175 72, C09K 700

Patent

active

041102258

ABSTRACT:
Zones of lost circulation and other undesired fluid communication channels into a wellbore are sealed by isolating a volume in the well including such a zone and applying greater than formation pressure to a novel slurry spotted in the zone until it hardens into a solid, drillable seal. Redrilling the bore can be accomplished even in soft, geologically young formations, without damaging the seal. The slurry contains per barrel from 5-50 pounds diatomaceous mix (see below), from about 35 to about 350 pounds of oil well cement, and at a minimum about 5 to 6 pounds of a flake type lost-circulation agent. Preferably, the weight per barrel of lost circulation agents is in the range of about 15 to 30 pounds of a mixture containing flakes, fibers, and hard granules.
Diatomaceous mix is powdered diatomaceous earth containing about 2% of ground lime and 8% of ground asbestos fibers.

REFERENCES:
patent: 2585366 (1952-02-01), Bollaert et al.
patent: 2683690 (1954-07-01), Armentrout
patent: 2943680 (1960-07-01), Scott
patent: 3375888 (1968-04-01), Lummus et al.
patent: 3380542 (1968-04-01), Clear
patent: 3411581 (1968-11-01), Alpha
patent: 3467193 (1969-09-01), Messenger
patent: 3496902 (1970-02-01), Cleary
patent: 3692102 (1971-12-01), Lummus
patent: 4014394 (1977-03-01), Bailey

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