The writers first used oil base muds for completing oil-bearing zones in Yabase and Okuchi oil fields in 1957 and 1958. One type oil base mud used, is composed of blown asphalt, A-2 diesel oil, tall sil, sodium silicate, caustic soda, graphite powder and sodium chloride; and another types are composed of Chokai crude oil instead of blown asphalt.
In this paper, the writers describe about the foundamental studies in laboratories and results of field uses.
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