IPC | Description | Record Count | % of 253 Patents |
C09K-008/02 | Well-drilling compositions | 81 | 32.016 |
C09K-008/12 | ・・・・containing synthetic organic macromolecular compounds or their precursors | 54 | 21.344 |
C09K-008/035 | ・・・Organic additives | 42 | 16.601 |
C09K-008/08 | ・・・・containing natural organic compounds, e.g. polysaccharides, or derivatives thereof | 41 | 16.206 |
C09K-008/60 | Compositions for stimulating production by acting on the underground formation | 31 | 12.253 |
E21B-043/00 | Methods or apparatus for obtaining oil, gas, water, soluble or melt able materials so a slurry of minerals from wells (applicable only to water E03B; obtaining oil-bearing deposits or soluble or melt able materials by mining techniques E21C 41/00 | 30 | 11.858 |
C09K-007/02 | Aqueous fluids containing organic or inorganic compounds | 29 | 11.462 |
C09K-008/10 | ・・・・・Cellulose or derivatives thereof | 28 | 11.067 |
E21B-021/00 | Methods or apparatus for flushing boreholes, e.g by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03; well drilling compositions C09K8/02) | 28 | 11.067 |
C09K-008/24 | ・・・・・・Polymers | 26 | 10.277 |