GS0091: Tracers for tracing subterranean formations; and materials capable of indicating changes of proppant placements dynamically over time
GS0211: Ceramic materials for use in the oil well and gas well industry, namely, ceramic pellets, shots, and spheres for use in oil well and gas well hydraulic fracturing and as a gravel pack material for sand control operation, and for use as strengthening agents for subterranean formations