C CHEMISTRY; METALLURGY
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C09K MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
C09K8/00 Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
C09K8/60 Compositions for stimulating production by acting on the underground formation
C09K8/62 Compositions for forming crevices or fractures
C09K8/66 Compositions based on water or polar solvents
C09K8/68 containing organic compounds