| 摘要 |
<p>A relatively low density, high strength round proppant material having (i) a round core made of a sintered mixture of fly ash and clay or, in some instances, fly ash, clay, and bauxite; and (ii) an outer shell made of sintered bauxite, and a method of making the same. The proppant materials which may be used in hydraulic fracturing operations in oil and gas wells.</p> |
