METHOD FOR REGULATING INTAKE CAPACITY PROFILE OF PRESSURE WELL (VERSIONS) Russian patent published in 2017 - IPC E21B43/22 C09K8/512 C09K8/514 C09K8/584 

FIELD: oil and gas industry.

SUBSTANCE: method for regulating intake capacity profile of a pressure well, including the preparation and injection of gel-forming composition into formation, comprising xanthan, chromium acetate, surfactant - SAS and water, and a process exposure for formation of gel, the intake capacity of the pressure well is predetermined. According to the first one version, with intake capacity of 150-300 m³/day before injecting the gel-forming agent, perform injection of aqueous solution rim of alkaline reagent with a concentration of 0.05-5.0 wt % of 5-10 m³ in volume, then the gel-forming composition is added, additionally comprising a bactericide-formalin or glutaraldehyde, with a content of components, wt %: xanthan - 0.2-0.4, chromium acetate - 0.02-0.04, surfactant - 0.1-0.2, bactericide - 0.05-2.0, the rest is fresh water. After that inject aqueous solution rim of alkaline reagent and a surfactant containing, wt %: alkaline reagent - 0.1-2.0, surfactant - 0.005-3.0, the rest is water with mineralization 0.15-300 g/l, at volume ratio of gel-forming composition to aqueous solution rim of alkaline reagent and surfactant, chosen depending on the intake capaity of the pressure well and equal to 1: (0.5÷3), force said rim into the formation with water with mineralization of 0.15-300 g/l in a volume of 10-15 m³ and stop the well for a technological exposure for 2 to 5 days. According to the second version, with intake capacity of 300-500 m³/day before injecting the gel-forming agent, an aqueous solution rim of an alkaline reagent with a concentration of 0.05-5.0 wt % of 10-20 m³ in volume, inject a gel-forming composition, additionally comprising a bactericide-formalin or glutaraldehyde, with a content of components, wt %: xanthan - 0.3-1.0, chromate acetate - 0.03-0.1, surfactant - 0.15-2.0, bactericide - 0.05-2.0, the rest is fresh water. After that inject aqueous solution rim of alkaline reagent and surfactant at their content, wt %: alkaline reagent - 0.1-2.0, surfactant - 0.005-3.0, the rest is water with mineralization 0.15-300 g/l, at the volume ratio of gel-forming composition to said rim, chosen depending on the intake capacity of the pressure well and equal to 1:(2÷4), force said rim into the formation with water with mineralization of 0.15-300 g/l in a volume of 10-15 m³ and stop the well for a technological exposure for 2 to 5 days. According to the third version, with intake capacity of 500-600 m³/day preliminary inject 50-100m of a dispersion composition rim into the formation, then an aqueous solution rim of alkaline reagent with concentration of 0.05-5.0 wt % of 20-30 m³ in volume, after that inject gel-forming composition, additionally comprising a bactericide-formalin or glutaraldehyde and a polymer, with a content of components, wt %: xanthan - 0.5-2.0, chromate acetate - 0.05-0.2, surfactant - 0.5-4.0, bactericide - 0.05-2.0, polymer - 0.1-1.0, the rest is fresh water. After injecting the gel-forming agent, perform injection of aqueous solution rim of alkaline reagent and surfactant at their content, wt %: alkaline reagent - 0.1-2.0, surfactant - 0.005-3.0, the rest is water with mineralization of 0.15-300 g/l, at the volume ratio of gel-forming composition to said rim, chosen depending on the on the intake capacity of the pressure well and equal to 1:3, force said rim into the formation with water with mineralization of 0.15-300 g/l in volume of 10-15 m³ and stop the well for a technological exposure for 4 to 12 days. Use sodium hydroxide or trisodium phosphate, or sodium liquid glass as alkaline reagent, a dispersed composition rim as aqueous dispersion of the filler with a concentration of 0.01-10.0 wt % or an aqueous dispersion of the filler and polymer with a component ratio, wt %: filler - 0.01-10, polymer - 0.005-1.0, the rest is water with mineralization 0.15-300 g/l, dolomite or wood flour, or bentonite clay powder used as a filler, as polymer - polyacrylamide or sodium carboxymethylcellulose, or hydroxyethylcellulose, said oxyethylated alkylphenols used as surfactant.

EFFECT: increased formation recovery, increased efficiency of formation coverage with impact and expansion of technological capabilities of the method.

3 cl, 4 tbl