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11.发明授权Use of alkali vanadates in reducing viscosity and gelation of drilling muds 失效使用碱金属钒酸盐降低钻井泥浆的粘度和凝胶化
公开(公告)号：US2160949A
公开(公告)日：1939-06-06
申请号：US16946037
申请日：1937-10-16
Applicant: STANDARD OIL DEV CO
Inventor： MILTON WILLIAMS
IPC: C09K8/05
CPC classification number: C09K8/05
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