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Related to seal off: sealable
seal off[′sēl ′ȯf]
To close off, as a tube or borehole, by using a cement or other sealant to eliminate ingress or egress.
Penetration of a drilling fluid into a formation so that the formation is prevented from producing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.