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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0172589 (1988-03-24) |
우선권정보 | DE-3709838 (1987-03-25) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 3 |
A drill bit direct drive for deep well drilling tools includes a tubular casing, a rotary machine provided inside the casing and driven by oil well fluid flowing through it, a radially mounted shaft connected to a rotary drill bit and at least one friction bearing exposed to the oil well fluid for a
A drill bit direct drive for deep well drilling tools, comprising: a rotary drill bit; a tubular casing; a rotary machine positioned within said tubular casing and being adapted to be driven by oil well fluid flowing therethrough; a shaft being axially mounted within said tubular casing and connecte
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