The influence of the filtration coefficient on the formation of cracks in the bed

Annotation. As the practice of developing hydrocarbon deposits has shown, when extracting oil from multilayer deposits, as a result of numerous hydrodynamic and geological-geophysical studies, separate sections of formations with a more homogeneous structure are identified. In most cases, such formations, as the results of the analysis of the state of development of deposits show, turn out to have sufficiently low filtration and capacitance properties (porosity and permeability), while increasing the volume of hard-to-recover oil reserves. This circumstance of deposits worsens the state of the degree of efficiency of extraction of hydrocarbon reserves from multilayer deposits. In this regard, in order to increase the efficiency of the oil field development process, various measures aimed at intensifying the extraction process from unproductive intervals-formations are very often used in practice. One of the active methods that allow the most complete displacement of oil from the productive reservoir is hydraulic fracturing.Currently, in many oil fields, in order to increase the flow rate of the well, hydraulic fracturing (FRACKING) in various combinations has been actively carried out recently by using both filtered and unfiltered liquids. In this regard, the greatest practical interest is the solution of the problem associated with the establishment of the effect of liquid filtration on the size of the crack opening formed during hydraulic fracturing. The article discusses one of the most common methods of increasing the productivity of wells that open low–permeability reservoirs - hydraulic fracturing (FRACKING). The paper investigates the effect of the liquid filtration coefficient on the width of cracks that are formed during hydraulic fracturing. Formulas for determining the width of cracks in the filter fluid are obtained. The results obtained show that liquid filtration has a significant effect on the width of the horizontal crack opening. Keywords. Borehole, filtration, pressure gradient, permeability, crack, hydraulic fracturing, crack width, crack length, collector.