| 摘要 |
A gamma ray logging tool and a bailer containing a catalyst or curing agent are lowered in a bore hole to a zone therein having a permeability which is to be decreased. A liquid plastic is pumped into the bore hole to the zone, the plastic containing a radioactive tracer detected by the logging tool when the plastic arrives at the zone, whereupon the catalyst is discharged from the bailer and mixed with the liquid plastic, the mixture then being displaced into the zone where it hardens.
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