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发明名称
Method for controlling pressure differential resulting from fluid friction forces in well-drilling operations
摘要
申请公布号
US3374341(A)
申请公布日期
1968.03.19
申请号
US19630325850
申请日期
1963.11.26
申请人
UNION OIL COMPANY OF CALIFORNIA
发明人
KLOTZ JAMES A.
分类号
E21B47/06
主分类号
E21B47/06
代理机构
代理人
主权项
地址
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