HYDRAULIC FRACTURING METHOD FOR OIL OR GAS DEPOSIT Russian patent published in 2014 - IPC E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: method includes injection of a breakdown fluid into the deposit at high speed and addition of a proppant to the breakdown fluid. At that the breakdown fluid is injected in several stages at different intensity, with the proppant and without it. Herewith at the first stage the breakdown fluid is injected without the proppant in a volume of at least 5 m³ at initial flow rate of 1.6-3 m³/min, at the second and subsequent even stages the breakdown fluid is injected with the proppant in a volume of at least 5 m³ with reduction of the flow rate per 10% from the initial value. At the third and subsequent odd stages the breakdown fluid is injected without the proppant in a volume of at least 5 m³ with increase in flow rate per 10% from the initial value. Addition of the proppant into the breakdown fluid is made by portions with increase in its concentration in the mixture with the breakdown fluid from 600 up to 800 kg/m³. Number of injection stages with addition of the proppant is defined by the minimum quantity of the proppant - 3500 kg per 1 m of the penetrated thickness, but in any case there should be at least two stages.

EFFECT: improving the efficiency of hydraulic fracturing.

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