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发明名称
摘要
申请公布号
DE3145922(C2)
申请公布日期
1988.09.01
申请号
DE19813145922
申请日期
1981.11.20
申请人
HALLIBURTON CO., DUNCAN, OKLA., US
发明人
SZARKA, DAVID DURWARD, DUNCAN, OKLA., US
分类号
E21B23/00;E21B23/02;(IPC1-7):E21B23/02
主分类号
E21B23/00
代理机构
代理人
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