RECOVERY METHOD FOR OIL-SOURCE RESERVOIRS BY CONTROLLED HYDRAULIC FRACTURE Russian patent published in 2017 - IPC E21B43/16 E21B43/26 

FIELD: petroleum industry.

SUBSTANCE: invention refers to the petroleum industry. The method of recovery of oil-source reservoirs by the controlled hydraulic fracturing includes selection of tight reservoir with the average absolute permeability of lea than 2 mD, where drilled wells are used or the new wells are drilled, either vertical or obliquely-directed. In each of such wells, the first hydraulic fracturing is performed (HF), during which the area of fracture propagation are recorded by means of low-frequency seismic survey. To the wells with the HF conducted, the insulation compound is pumped with the following ratio of components, mass.%: SAS - 0.2-5.0; SAA - 0.005-2.5; chromium acetate - 0.01-1.0; filler - 0.5-15.0; water with mineralization of no more 1.5 g/l - the rest. After the soak period during 1-10 days and colmatation of fractures after the first HF, the second HF is conducted in the same well by the pumped insulation compound, during which fracture propagation is also recorded by means of the low-frequency seismic survey. According to the received data on fracture propagation after the first and the second HF, a decision on conduction in these wells of the following stages of the pumping of the insulation compound and conduction of the following HF is made, moreover, the number of the following HF is determined according to the coverage of a reservoir by fractures areas in 360° in the plan in the area of each well. After all HF, the processing of the reservoir is held by the pumping of the insulation compound solvent in the volume of 0.8-2.0 from the sum of volumes of insulation compounds pumped earlier in the same well.

EFFECT: technical result lies in the increasing of the coverage factor and oil production of the oil-source reservoirs.

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