PROCESS FOR PRODUCING A HIGH STRENGTH ARTIFICIAL (CAST) STONE WITH HIGH PERMEABILITY AND FILTER EFFECT

The invention relates to a process for producing a highstrength artificial stone with high permeability and filtering effect mainly for protecting deep-drilled wells yielding mineral oil, natural gas and water against getting choked by sand. A mixture comprising an artificial resin as a binding material containing a catalyzer for controlling duration of binding and pumpability and an assorted granular material of high-strength forming the skeleton and salt filling and increasing pore spaces is homogenized and pumped into the corresponding producing section of teh well into the area to be protected. After hardening of the mixture salt is dissolved from the obtained artificial stone and a filtering effect is achieved without binding the grains of the reservoir rock. Due to the mechanic characteristics and controlled porosity of the obtained artificial stone rock-parts, mainly sand delivered by the yielded fluidum into the well will be retained. An artificial stone with filtering effect can be prepared and hardened on the surface which can be inserted into the well and may be used as a sand-filter or with a desired shape and size it can be used for ecological purposes or in the industry to filter liquids or gaseous media, resp.