Proppingagent based on zirconia and silica for deep geological fractures

摘要

The invention relates to a granular propping for use in petroleum extraction which has a high mechanical resistance and a density of between 3150 and 3250 kg/m.sup.3, the propping agent consisting of balls formed by melting, granulating and solidifying an initial composition comprising by weight, on the basis of the oxides, 47.1 to 48. 7 parts of ZrO.sub.2, 52.9 to 51.3 parts of SiO.sub.2, the total of ZrO. sub.2 +SiO. sub.2 amounting to 100 parts, 8.2 to 16.9 parts of Al.sub.2 O. sub.3 and 4. 1 to 8.5 parts of at least one oxide selected from the group formed by MgO, CaO, FeO and TiO.sub.2.