FIELD: oil- and gas-extracting industry.
SUBSTANCE: invention relates to blocking critical zone of seam with high permeability and cracks formed in the process of hydraulic break of seam and fixed with proppant in carrying out major repairs of holes. The composition for blocking critical zone seam of gaseous holes comprises the following components, wt.-%: carboxymethylcellulose, 1.5-2.0; magnesium chloride, 12.0-18.0; sodium hydroxide, 10.0-16.0, and water, the balance, and, additionally, above 100%: microspheres, 25.0-40.0, and chalk, 3.0-5.0. Invention provides enhancing effectiveness in blocking seam with high permeability or cracks formed in the process of hydraulic seam break and fixed with proppant, and in retaining filtration-capacity properties of rock-collectors, and reducing cost in carrying out works in major repairs of holes.
EFFECT: improved and valuable properties of composition.
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