Nonstationary well production process in multilayered reservoir is considered. Fluid and rock matrix is deformable, bulk in a reservoir strata is not available. Wellbore fluid crossflow between layers during production shuttingin and start is leakage studied numerically. Predicted volume and time of such crossflow are comparable with parameters of well chemical treatment. The main conclusion of the research is the availability of wellbore crossflow usage for selective well treatment. Methods of variation of inflow volume in particular layer during nonstationary wellbore crossflow are considered.

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