WELL OPERATION METHOD Russian patent published in 2008 - IPC E21B43/00 E21B33/13 E21B43/27 

FIELD: oil production, particularly to operate well drilling in stacked pool including reservoirs with different injectivities.

SUBSTANCE: method involves injecting cement-and-chalk mix in well; casing well and performing acid well treatment. Cement-and-chalk mix has volume and is injected in hole annuity under pressure, which provide cement-and-chalk ring creation in hole annuity for partial perforation orifice of productive interval mudding. For well casing cement bridge of plugging cement is arranged in well opposite to lower reservoir having high injectivity. Acid treatment is performed in productive reservoir intervals not covered with cement. The cement-and-chalk mix includes cement and chalk with ratio of 1:(0.1-0.4).

EFFECT: possibility to create isolation screen, which may be easily removed during well development with the use of acid solution along with well deliverability keeping.

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