FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.
SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.
EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.
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