Rotary kinetic fluid motors or pumps – Runner has spirally arranged blade or fluid passage – Extending along runner axis
Reexamination Certificate
2000-07-24
2002-08-27
Denion, Thomas (Department: 3748)
Rotary kinetic fluid motors or pumps
Runner has spirally arranged blade or fluid passage
Extending along runner axis
C415S072000, C416S176000, C416S177000, C175S107000
Reexamination Certificate
active
06439834
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an oil field tool which has been improved for a particular application in the oil field environment, where it is commonly referred to as a “downhole” motor. More specifically, a hydraulic motor of the tool incorporates a novel stator sleeve and guide bearings which eliminate distortion of the material thereof due to effects of the working environment when the tool is used within the shaft of a well, eliminating seizure of the motor during such use.
2. Prior Art
Heretofore the motor of the oil field tool has included a stator having a rubber sleeve therein within which a rotatable shaft called a rotor rotates, and guide bearings incorporating a rubber material insert therein for guiding a rotating drive shaft of a mill which is driven by the rotor. When such tool is used within a well shaft, because temperatures therein may reach almost 400° F., the rubber of the sleeve and bearings inherently deforms, swelling against and around the rotating structures therewithin, causing the motor to seize.
Also, at times, the sleeve and bearings are simultaneously subjected to extremely low temperatures and chemical reactants, such as, for example, when liquid nitrogen is pumped through the tool for use in causing ejection of material blocking a well, such as a paraffin buildup which is broken apart by the tool, via the well shaft, with the rubber swelling further under these conditions by impregnation of the nitrogen thereinto.
Further, during repair of such seized motor, such a degree of pressure is needed to release a shaft from its entrapment within the rubber, that the shaft is often bent, requiring the purchase of a new shaft, each such shaft having a replacement price of $1500.00 or more.
Thus, there exists a need for bearings and a stator sleeve for the motor which will not be affected by ambient conditions of the working environment.
SUMMARY OF THE INVENTION
Accordingly, it is a primary object of the invention to provide an improved oil field tool which will not seize when subjected to ambient conditions of use within the shaft of a well.
This object, as well as others, is met by the oil field tool of the present invention wherein an inner sleeve of a stator and an insert of guide bearings for a mill drive shaft of the tool motor are made of a material such as a polymer which is not compromised in its chemical or physical characteristics over a temperature range of approximately 800° F., or by contact thereof with liquid nitrogen.
REFERENCES:
patent: 3023059 (1962-02-01), Kirk
patent: 3131979 (1964-05-01), Shobert
patent: 3582166 (1971-06-01), Reising
patent: 3637273 (1972-01-01), Orndorff, Jr.
patent: 3693842 (1972-09-01), Cozzarin et al.
patent: 3728049 (1973-04-01), Miller, Jr.
patent: 3822972 (1974-07-01), Ogly et al.
patent: 3857654 (1974-12-01), Streicher
patent: 3864197 (1975-02-01), Shobert
patent: 3912426 (1975-10-01), Tschirky
patent: 3932004 (1976-01-01), Orndorff, Jr.
patent: 3976453 (1976-08-01), Brown
patent: 3982858 (1976-09-01), Tschirky
patent: 3982859 (1976-09-01), Tschirky et al.
patent: 4669555 (1987-06-01), Petree
patent: 4676725 (1987-06-01), Eppink
patent: 4725151 (1988-02-01), Orndorff, Jr.
patent: 5662180 (1997-09-01), Coffman et al.
patent: 5816700 (1998-10-01), Starke, Sr. et al.
patent: 5832604 (1998-11-01), Johnson et al.
patent: 2258135 (1973-06-01), None
patent: 2713468 (1978-09-01), None
patent: 400508 (1933-10-01), None
patent: 622583 (1949-05-01), None
Denion Thomas
McManus Kajane
Trieu Theresa
LandOfFree
Oil field tool does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Oil field tool, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oil field tool will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2961313