JET MOTOR

Abstract

The invention comprises a downhole jet motor, and a method of using same, that can be utilized to drill or to clean a well bore or tubing. The jet motor comprises a power shaft partially surrounded by a control sleeve defining a blind annular space, closed at the upper end and open at the lower end to allow fluid discharge. At least one opening is provided in the drive shaft wall extending radially within the annulus region. Drilling or cleaning fluid pressure is directed to the at least one opening in the power shaft. The control sleeve provides a reaction structure in relation to fluid discharged from the at least one opening producing rotation of the drive shaft in relation to the control sleeve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of the jet motor of the present invention fully assembled.

FIG. 2 is a partial exploded view of the present invention.

FIG. 3A is a side view of the drill bit.

FIG. 3B is a side view of an alternative embodiment of the drill bit.

FIG. 3C is a cross-sectional view of the drill bit.

FIG. 4 is a cross-sectional view of the jet motor.

FIG. 4A is a cross-sectional view of the power shaft.

FIG. 5 is a cross-sectional view of an alternative embodiment of the jet motor.

Claims

1. A motor for a downhole tool comprising: a cylindrical control sleeve;a power shaft;said power shaft at least partially surrounded by said control sleeve;said power shaft rotatable in relation to said control sleeve;said power shaft having a shaft wall;said power shaft having an interior power shaft channel;at least one opening provided in said shaft wall;said at least one opening in fluid communication with said shaft channel;said control sleeve having an interior sleeve surface;said at least one opening having an opening axis;said opening axis oriented toward said control sleeve surface.

2. The motor of claim 1 further comprising: said control sleeve and said power shaft defining an annulus;said at least one opening having an opening outlet; andsaid opening outlet proximate said annulus.

3. The motor of claim 2 further comprising: said annulus having an annulus closed end and an annulus open end; andsaid opening outlet intermediate said annulus closed end and said annulus open end.

4. The motor of claim 1 further comprising: said power shaft having a shaft axis; andsaid opening axis acutely oriented in relation to a plane through said shaft axis.

5. The motor of claim 1 further comprising: said control sleeve connected to an upper subassembly;said upper subassembly connectable to a drill string;said upper subassembly having an interior upper channel;an injection tube providing fluid communication from said upper channel to said shaft channel.

6. The motor of claim 5 further comprising: said injection tube comprising a tube head and a tube;said tube head in said upper subassembly; andsaid tube extending into said shaft channel.

7. The motor of claim 6 further comprising: said shaft channel having an interior shaft surface;said tube having an exterior tube surface; andsaid tube slidably received in said shaft surface.

8. The motor of claim 7 further comprising: said tube constructed to expand at a predetermined pressure;wherein said tube surface forming a seal against said shaft surface upon application of a predetermined pressure.

9. The motor of claim 8 further comprising: said tube having a flared opening proximate a lower tube end; andsaid lower tube end received in said shaft channel proximate said shaft surface.

10. The motor of claim 1 wherein said at least one opening provided in said shaft wall comprising a nozzle.

11. A motor for a downhole tool comprising: a cylindrical control sleeve;a power shaft;said power shaft at least partially surrounded by said control sleeve;said power shaft rotatable in relation to said control sleeve;said power shaft having a shaft wall;said power shaft having an interior power shaft channel;at least one nozzle provided in said shaft wall;said at least one nozzle in fluid communication with said shaft channel;said control sleeve having an interior sleeve surface;said at least one nozzle having a nozzle axis;said nozzle axis oriented toward said control sleeve surface.

12. The motor of claim 11 further comprising: said control sleeve and said power shaft defining an annulus;said at least one nozzle having a nozzle outlet;said nozzle outlet proximate said annulus;said annulus having an annulus closed end and an annulus open end; andsaid nozzle outlet intermediate said annulus closed end and said annulus open end.

13. The motor of claim 12 further comprising: said power shaft having a shaft axis; andsaid nozzle axis acutely oriented in relation to a plane through said shaft axis.

14. The motor of claim 11 further comprising: said control sleeve connected to an upper subassembly;said upper subassembly connectable to a drill string;said upper subassembly having an interior upper channel;an injection tube providing fluid communication from said upper channel to said shaft channel.

15. The motor of claim 14 further comprising: said injection tube comprising a tube head and a tube;said tube head in said upper subassembly;said tube extending into said shaft channel;said shaft channel having an interior shaft surface;said tube having an exterior tube surface;said tube slidably received in said shaft surface;

16. The motor of claim 15 further comprising: said injection tube rotatable in relation to said upper subassembly; andsaid injection tube rotatable in relation to said power shaft.

17. The motor of claim 16 further comprising: said tube constructed to expand at a predetermined pressure;wherein said tube surface forming a seal against said shaft surface upon application of a predetermined pressure.

18. The motor of claim 16 further comprising: said tube having a flared opening proximate a lower tube end; andsaid lower tube end received in said shaft channel proximate said shaft surface.

19. A method for providing rotation in a downhole tool comprising: attaching a control sleeve attached to a drill string,attaching a rotatable power shaft having at least one opening to the drill string such that the power shaft is at least partially within the control sleeve to define an annulus intermediate the power shaft and the control sleeve; andproviding a fluid under pressure to the rotatable power shaft such that the fluid is forced through said at least one opening into said annulus to impact said control sleeve.

20. The method of claim 19 wherein: said fluid comprising nitrogen.

21. The method of claim 19 wherein: said fluid comprising a conventional drilling fluid.