Methods,treatment fluids and systems utilizing a particulate pack for acidizing a siliceous material

A method comprising:

• introducing a first treatment fluid into a wellbore penetrating a subterranean formation comprising a siliceous material, the first treatment fluid comprising:
• an aqueous carrier fluid;
• a mineral acid, wherein the mineral acid is present in an amount of about 1% to about 20% by weight of the treatment fluid;
• a solid particulate;
• and
• a latent hydrofluoric acid composition, wherein the latent hydrofluoric acid composition is present in a solid form in the first treatment fluid, wherein the latent hydrofluoric acid composition comprises an acid-degradable matrix, and a hydrofluoric acid precursor dispersed in the acid-degradable matrix, wherein the hydrofluoric acid precursor is selected from the group consisting of fluoroboric acid, fluorosulfuric acid, hexafluorophosphoric acid, hexafluoroantimonic acid, difluorophosphoric acid, hexafluorosilicic acid, potassium hydrogen difluoride, sodium hydrogen difluoride, polyvinylammonium fluoride, polyvinylpyridinium fluoride, pyridinium fluoride, imidazolium fluoride, ammonium fluoride, tetrafluoroborate salts, hexafluoroantimonate salts, hexafluorophosphate salts, bifluoride salts, perfluorinated organic compounds, titanium fluoride, cesium fluoride, boron trifluoride, boron trifluoride complexes, or combinations thereof, and wherein the hydrofluoric acid precursor is present in an amount of about 1% to about 8% by weight of the latent hydrofluoric acid composition;
• setting a proppant pack within a fracture network defined in the siliceous material, the proppant pack comprising at least a portion of the plurality of particulates and the solid form of the latent hydrofluoric acid composition;
• contacting the proppant pack with the mineral acid, thereby degrading at least a portion of the acid-degradable matrix, exposing at least a portion of the hydrofluoric acid precursor, and converting the exposed hydrofluoric acid precursor into hydrofluoric acid;
• and
• reacting the hydrofluoric acid with the siliceous material adjacent to a location in the proppant pack where the latent hydrofluoric acid composition was present.