Rotary expansible chamber devices – With supply or exhaust passage in working member – Supply or exhaust passage through working member center of...
Patent
1995-09-25
1998-03-31
Vrablik, John J.
Rotary expansible chamber devices
With supply or exhaust passage in working member
Supply or exhaust passage through working member center of...
418225, 417405, 175107, F03C 222, F04C 2344, F04C 1100
Patent
active
057331138
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hydraulically or pneumatically driven roller vane motor for directional including horizontal and straight hole drilling and cleaning/repairing and to a roller vane pump for pumping oil and/or water from a subterranean reservoir to the ground surface or for pumping up water from a surface water reservoir. To drive drill bits, it is known to use a roller vane motor located on the drill string above the bit, which motor is driven by the drilling mud that is pumped through the drill string to lubricate and cool the bit and carry drill cuttings back to the ground surface through the annular space between the drill string and the borehole wall. Roller vane motors are described in U.S. Pat. No. 2,725,013, GB A 2,201,734, WO-A-9214037 and WO-A-9308374. The known roller vane motors for use in drilling have both an outer and an inner h6using, the annulus between these housings being closed off halfway down the motor by a barrier. Part of the drilling mud is pumped down through this annulus, enters chambers between the motor and the inner housing through inlet ports in the inner housing above the barrier and leaves these chambers again through outlet ports in the inner housing below the barrier. Rollers, located in the extended position in recesses in the rotor, are pushed by the drilling mud in the chambers between rotor and inner housing from the inlet ports towards the outlet ports in a clockwise direction. Rollers that are located between outlet ports and inlet ports are not subjected to any rotational and pressure since they have been forced into a retracted position by longitudinally extending wing deflector cams along the interior wall surface of the inner housing. The rollers are forced into contact with the interior wall surface of the inner housing by the pressure of the drilling mud acting on the rear ends of the rollers. In WO-A-9214037 part of the pressure of the drilling mud acts through ports in the rotor that connect the recesses with a central conduit in the rotor, through which the remainder of the drilling mud flows from the drill string to the drill bit.
The present invention provides an improved roller vane motor and roller vane pump resulting in a simpler construction, a larger diameter of the rotor for a given outside diameter of the motor, reduced friction losses and more torque. In addition, these motors and pumps are easier to repair and maintain.
To this end, the roller vane motor according to the present invention may comprise a roller vane motor for downhole drilling having a housing and a rotor. The housing contains outlet ports and wing deflector cams that divide the space between housing and rotor into chambers. The rotor is equipped with cylindrical rollers in recesses which rollers can move between an extended and retracted position. Part of the drilling mud that flows through a central conduit in the rotor passes through inlet ports and the recesses into chamber portions and pushes the rollers into their extended position and in a clockwise direction, making the rotor turn, while drilling mud at a lower pressure is pushed from the corresponding chamber portion through the outlet port into the annulus between the motor and the borehole wall. When the rollers each the wing deflector cams, they are forced into retracted positions and their tasks then being taken over by the successive rollers. In addition, the present invention provides a special roller vane motor for use as a production motor to drive a downhole rotating pump, and a special roller vane pump. Finally, the present invention provides methods and systems for the use of the pumps and motors of the present invention.
The present invention will be elucidated below in more detail with reference to a drawing, showing in:
FIG. 1, FIG. 2 and FIG. 3 transverse sectional views from above of roller vane motors according to the present invention;
FIG. 4, FIG. 5 and FIG. 6 transverse sectional views from above of roller vane pumps according to the present invention;
FIG. 7 and FIG. 8 schematic side-views of
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Jaskiewicz Edmund M.
Vrablik John J.
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