Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1977-11-09
1978-09-19
Purser, Ernest R.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
175 39, 175 40, 175228, 175237, 184 1C, 308 1A, E21B 106
Patent
active
041147049
ABSTRACT:
A turbo drill which is connected to a string of drill pipe as 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 cresent shaped in cross section with each blade having an exit angle of 14.degree. - 23.degree. 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. A plug member in the bearing shaft is positioned to be dislodged at the low lubricant position of the first piston to provide a temporary obstruction to the flow of drilling fluid to give an indication, at the well surface, of loss of lubricant in the tubro drill. An optional feature provides for increasing the pressure drop of drilling fluid in the turbo drill to cause the vertical thrust to be carried on the bottom vertical thrust bearings, after the top vertical thrust bearings are worn, and thus extend the drilling life substantially. A further optional feature is a locking ring arrangement which prevents separation of threaded connections in the drill housing during use.
REFERENCES:
patent: 3014542 (1961-12-01), Hildebrandt et al.
patent: 3720271 (1973-03-01), Kern
patent: 3840080 (1974-10-01), Berryman
patent: 3989409 (1976-11-01), Ioannesian
patent: 4015882 (1977-04-01), Stennert
Maurer William Casper
McDonald, Jr. William Jesse
Sinclair Albert Richard
Favreau Richard E.
Maurer Engineering Inc.
Mosely Neal J.
Purser Ernest R.
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