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