GAS RELEASING FOAMING COMPOSITION FOR INITIAL EXPOSING OF PRODUCTIVE FORMATION AND WELL DEVELOPMENT Russian patent published in 2008 - IPC E21B21/14 C09K8/38 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the mining industry and to the compositions of the drilling solutions for initial exposing of the productive formations with the abnormal low bed pressure and to the compositions of liquids for evoking influx in development of the oil and gas wells. The composition contains the foaming agent, foam stabiliser, gas-forming components and water; biopolymer and carboxymethyl cellulose are used as stabiliser, sodium carbonate or hydrocarbonate and sulfamic acid are used as the gas-forming components at the following ratio, in mass percent: 0.2-0.5 of foaming agent; 0.3-0.5 of biopolymer; 0.7-0.9 of carboxymethyl cellulose; 0.38-1.60 of sodium carbonate or hydrocarbonate; 0.68-3.00 of sulfamic acid; remaining - water.

EFFECT: increased stability of foam for initial exposing of the productive formations at low density, filtration, high rheologic characteristics of the structure and lack of solid.

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