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发明名称
PROCESSO PARA PREVENCAO DO APARECIMENTO DE AGUA NOS POCOS JA PERFURADOS OU EM CURSO DE PERFURACAO
摘要
申请公布号
BR7708737(A)
申请公布日期
1978.11.21
申请号
BR19770008737
申请日期
1977.12.29
申请人
ELF AQUITAINE
发明人
VIO L
分类号
C09K8/512;C09K8/88;E21B21/00;(IPC1-7):E21B41/00
主分类号
C09K8/512
代理机构
代理人
主权项
地址
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