Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1984-04-30
1986-09-23
Leppink, James A.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
175228, 384 93, E21B 402
Patent
active
046130020
ABSTRACT:
A downhole drilling tool having a tubular stem connected to the drill string, and a tubular housing mounted concentrically and rotatably on the stem, forming an annular space between the housing and the stem. A plurality of bearings within the annular space support the housing against radial and longitudinal thrust loads. A plurality of seals within the annular space above and below the bearings form a lubricant chamber. The housing has a cylindrical lubricant passage extending between the lubricant chamber and the annular space outside of the lubricant chamber. A cylindrical piston is sealably slidable within the lubricant passage and responds to pressure of the drilling fluid entering the passage from the exterior of the housing to force lubricant out of the passage and into the lubricant chamber in order to replace lubricant which is lost therefrom. A downhole drilling motor is attached to the lower end of the housing. The drilling motor has a stator and a rotor which is rotated with respect to the stator in response to the flow drilling fluid through the drilling motor.
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Hamilton William R.
Pittman Paul R.
Scott, Jr. Floyd L.
Felsman Robert A.
Hughes Tool Company
Kelly H. Dennis
Leppink James A.
Neuder William P.
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