WELL DEVELOPMENT METHOD Russian patent published in 2006 - IPC E21B43/18 E21B43/27 

FIELD: oil and gas industry, particularly to develop deep wells by differential pressure drawdown.

SUBSTANCE: method involves substituting liquid filling well for surfactant solution; saturating the surfactant solution by supplying gas-generation agent, for instance ammonium carbonate, in well. Before gas generation agent supplying well bottom zone is processed with acid by forcing acid into reservoir. Aqueous sodium nitrate NaNO₂ solution and aqueous hydrochloric acid HCl solution may be additionally used as the gas generation agent. Aqueous gas generation agents are injected in portions each having volume of 0.5-2.0 m³ in the following sequence: ammonium carbonate, hydrochloric acid and sodium nitrite. Each following solution has density exceeding that of previous one. The solution volume is 0.3-1.0 well volume, but is not less than 1.1 of inner pressure column volume and defined by useful well volume. Hollow glass microspheres are added to surfactant solution.

EFFECT: minimization of backpressure in pressure column to increase discharge from well and increased well output.

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