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φ２１５．９─１３８（Ｄ）和φ３１１．２─５１７（Ｎ）型三牙轮钻头通过局级验收由成都石油总机械厂和西南石油学院联合研制开发的φ２１５．９─１３８（Ｄ）和φ３１１．２─５１７（Ｎ）型三牙轮钻头，于１９９６年１月２４日在成都通过专家验收，并受到好评。专家...
φ215.9─138 (D) and φ311.2─517 (N) tricone bit pass through the Bureau level acceptance by the Chengdu Petroleum Machinery Plant and Southwest Petroleum Institute jointly developed φ215.9 ─ 138 (D) and φ311 .2 ─ 517 (N) -type tri-cone bit, on January 24, 1996 in Chengdu by experts, acceptance and was well received. expert...