Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate
1998-11-03
2001-05-15
Pezzuto, Robert E. (Department: 3671)
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
C175S101000, C175S106000
Reexamination Certificate
active
06230823
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
Following U.S. patents may be relevant to this invention:
U.S. Pat. No. 2,990,894 by J. A. Mitchel et al, Jul. 4, 1961
U.S. Pat. No. 3,112,801 by W. Clark et al, Mar. 5, 1959
U.S. Pat. No. 3,840,080
U.S. Pat. No. 5,090,497
U.S. Pat. No. 4,567,867
U.S. Pat. No. 3,852,002
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable
BACKGROUND OF THE INVENTION
This invention relates to a positive displacement motor that can be used, among other applications, for drilling oil and gas exploration holes, oil wells and directional holes for different purposes.
In some cases of exploration holes it is necessary to produce drilling power right on the drilling bit that may be operating deep in a hole that may be curved (not straight). In such cases a positive displacement motor is required, usually powered by pressurized fluid/gas mixture pumped from the surface. The motor transforms mainly hydrostatic energy of the fluid/gas mixture into rotary motion being used to power the drilling bit in the hole.
Prior positive displacement motors for drilling exhibit a few disadvantages. Some of them require a universal joint that has to carry all drilling power since the motor itself performs a complex motion (two circular motions combined). Prior motors may contain polymer parts which would wear out thus reducing duration of drilling runs. Other disadvantage of the prior motors is substantial length of the motor required to generate a sufficient power for the drilling bit. Such lengthy motors may be sensitive to high bending moments that may occur under some drilling conditions.
BRIEF STATEMENT OF THE INVENTION
The invention is directed to a positive displacement motor for drilling oil and gas exploration wells where the drilling power should be generated in the close proximity of the drilling bit. The object of the present invention is to provide a motor that would not require universal joint and would be shorter in length than the present designs, maintaining the same displacement per revolution as well as be manufacturing friendly.
The new motor consists of the fixed external housing, which contains outer rim shaped (see
FIG. 1
) such that it has six or eight lobes on the toothed, inner surface, the rotor that rotates around a fixed axis and has four or six lobes on the toothed outer surface as well as ten or fourteen planetary gears being engaged with both the outer rim and the rotor, dividing space between the two into ten or fourteen working chambers changing their volume with the rotation of the rotor.
REFERENCES:
patent: 908365 (1908-12-01), Ward
patent: 3852002 (1974-12-01), Sieniawski
patent: 4415316 (1983-11-01), Jurgens
Petravick Meredith C.
Pezzuto Robert E.
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