Method for laboratory assessment of the permeability recovery coefficient of porous media after hydraulic fracturing fluid exposure

UDK: 622.276.66

DOI: 10.24887/0028-2448-2026-4-84-87

Key words: methods analysis, permeability recovery coefficient, porous medium, reservoir properties, hydraulic fracturing, hydraulic fracturing fluid, core sample

Authors: M.A. Silin (Gubkin University, RF, Moscow); L.A. Magadova (Gubkin University, RF, Moscow); V.B. Gubanov (Gubkin University, RF, Moscow); S.A. Borodin (Gubkin University, RF, Moscow); D. Shirokov (Gubkin University, RF, Moscow); N.D. Smirnov (Gubkin University, RF, Moscow)

The permeability recovery coefficient of the porous medium of a productive reservoir at the interface with a fracture formed after hydraulic fracturing is one of the most important parameters determining its effectiveness. Therefore, in the process of laboratory research, a special role is assigned to the methodology of conducting the test experiment for the experimental evaluation of this parameter's magnitude under specific reservoir conditions when using a particular fracturing fluid. An analysis of various experimental methods shows that standard laboratory studies using a flow cell do not enable the direct determination of this parameter's value. The use of reservoir models with mixture of sand and сlay with given permeability and the imitation of a hydraulic fracture enables comparative experiments to investigate the effectiveness of different fracturing fluids with good reproducibility of results due to the specific structure of the porous medium. However, the use of models made of several core samples or a single core sample from the specific section of the productive reservoir where hydraulic fracturing is intended, as the porous medium, significantly refines the obtained result. It should be noted that each experimental methodology has its inherent limitations and advantages. The article proposes a methodology for conducting experiments using a single core sample, justifying the parameters for fracturing fluid injection, as well as the conditions for modeling the well completion process after the impact of fracturing fluid on the porous medium during laboratory research.

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