Integrated Experimental and Modeling Study of Geochemical Reactions of Simple Fracturing Fluids with Caney Shale

Interactions between rock minerals and hydraulic fracturing fluids directly impact the geochemical geomechanical properties of shale formations. However, mechanisms reactions in unconventional reservoirs remain poorly understood. To investigate fluids, a series batch reactor experiments were undertaken. Three samples with different mineralogical compositions three fluid [deionized water, deionized water + 2% potassium chloride (KCl), 0.5% choline (C5H14ClNO)] used. Experiments undertaken at reservoir temperature atmospheric pressure. Elemental effluents after 1, 3, 7, 14, 28 days analyzed using inductively coupled plasma mass spectrometry. Medical computed tomography scanning X-ray fluorescence spectroscopy conducted on entire core to help upscale results obtained from rock–fluid interaction experiments. Geochemical modeling reactive simulator, TOUGHREACT, was corroborate experimental results. Results show that lower pH triggered high dissolution rates samples, especially carbonate components. As increased, rate declined significantly, though for most cases still continued. The observed dissolved silica concentrations much higher than quartz solubility, suggesting originated more soluble polymorphs possibly desorption clay mineral exchange sites. concentration elemental species solution but aluminum (Al) magnesium (Mg) rapidly following initial entry into solution. corroborated conclusions regarding precipitation experiments, notably calcite pyrite reacted likely presence such as opal, chalcedony, or amorphous these reduction Al Mg by secondary aluminosilicate phases. de-flocculation during reaction implies fines migration fracturing. This is detrimental productivity are displaced lodged within micro- nanofractures created immediate consumption also has implications blockage hydrocarbon pathways due new locations.