Patent ID: 7540328

Claim:
A method of creating a fracture in a subterranean formation penetrated by a wellbore comprising: a. preparing a fluid comprising a solid acid precursor and a solid that releases hydrogen fluoride in the presence of aqueous acid, said fluid further comprising inert particles in sufficient amount to form a masking material over portions of one or more fracture faces, creating a balance between masked areas and un-masked areas along the fracture face, b. injecting said fluid into said formation above fracture pressure, and c. allowing at least a portion of said solid acid-precursor to hydrolyze, and release hydrogen fluoride creating a dissolving system, said dissolving system removing rock from portions of one or both fracture faces that is not protected by the masking material, wherein said portions of fracture faces protected from dissolution create pillars between the fracture faces which hold open the fracture and create a highly conductive pathway.