Down hole drilling motor with pressure balanced bearing seals
A down hole drilling motor, e.g., A turbodrill, which is connected to a string of drill pipe has a rotating shaft for driving a drill bit which may be a rotary bit or a high speed solid head diamond bit. The turbine section has rotor and stator blades which are crescent shaped in cross section with each blade having an exit angle of 14*-23* for maximum turbine efficiency. The bearing shaft is provided with chevron rotary seals positioned below the rotary bearings carrying both radial and vertical thrust. Fluid lubricant fills the space from the rotary seals to a predetermined level above the bearings. A piston seals the lubricant chamber and is pressurized by drilling fluid (I.E. Mud) flowing through the tool. A layer of lubricant fluid overlies the first piston and has a second piston covering said fluid and transmitting pressure from the drilling fluid to the lubricant fluid surrounding the bearings. The drilling mud that causes the turbodrill to rotate is pumped away from the bearing seals by pump means operated by the drilling motor to balance the pressure on the upper and lower bearing seals.
- Assignee:
- Maurer Engineering Inc
- Patent Number(s):
- US 4246976
- OSTI ID:
- 6340752
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420206* -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
BEARINGS
BOREHOLES
CAVITIES
DESIGN
DRILL PIPES
DRILLING
DRILLING EQUIPMENT
DRILLING FLUIDS
EQUIPMENT
FLUID FLOW
FLUIDS
MACHINE PARTS
MACHINERY
PIPES
SEALS
SHAFTS
TURBINES
TURBOMACHINERY
WELL DRILLING