IPC | Description | Record Count | % of 366 Patents |
C09K-008/02 | ・Well-drilling compositions | 97 | 26.503 |
C09K-007/02 | ・Aqueous fluids containing organic or inorganic compounds | 87 | 23.770 |
C09K-008/12 | ・・・・containing synthetic organic macromolecular compounds or their precursors | 55 | 15.027 |
C09K-008/08 | ・・・・containing natural organic compounds, e.g. polysaccharides, or derivatives there of | 51 | 13.934 |
C09K-008/035 | ・・・Organic additives | 43 | 11.749 |
C09K-008/60 | Compositions for stimulating production by acting on the underground formation | 39 | 10.656 |
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 | 39 | 10.656 |
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) | 35 | 9.563 |
C09K-007/00 | Compositions are classified according to their major constituent | 33 | 9.016 |
E21B-043/25 | Methods for stimulating production (dump bailers E21B 27/02; vibration generating arrangements E21B 28/00; chemical compositions therefor C09K 8/60) | 30 | 8.197 |