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