Downhole annular flow diverter

1. A device for directing a fluid flow in an annulus around a pipe string in a horizontal or deviated well having a borehole defining a well path, the device comprising:

an orientation sensing member adapted to distinguish between a high-side and a low-side of the borehole along the well path;

a fluid direction member adapted to impede the fluid flow in one portion of the annulus so as to at the same time increase the fluid flow in another portion of the annulus; and

said one portion being one of the low side and high side of the borehole and said another portion being a different one of the low side and high side;

wherein the orientation sensing member is a buoyancy member adapted to self-orient the fluid direction member via buoyancy.

2. The device according to claim 1 , wherein the device further comprises an orientation member for orienting the fluid direction member in the borehole.

3. The device according to claim 1 , wherein the fluid direction member is adapted to impede the fluid flow on the high-side of the borehole so as to increase the fluid flow on the low-side of the borehole.

4. The device according to claim 1 , wherein the fluid direction member is adapted to impede the fluid flow on the low-side of the borehole so as to increase the fluid flow on the high-side of the borehole.

5. The device according to claim 1 , wherein the orientation sensing member is a weight member adapted to self-orient the fluid direction member via gravity.

6. The device according to claim 1 , wherein the fluid direction member is an expandable packer or sleeve having a non-uniform radius.

7. The device according to claim 1 , further comprising an activation member for activating the fluid direction member in the well.

8. The device according to claim 7 , wherein the activation member is operateable via one of the following sources:

hydraulic pressure in the pipe string;

hydraulic pressure in the annulus;

chemical reaction;

a downhole electric motor;

a biasing member;

hydrostatic force;

a container of compressed fluid; or

shape memory metals.

9. A pipe string comprising:

a device for directing a fluid flow in an annulus around a pipe string in a horizontal or deviated well having a borehole defining a well path, the device comprising:

an orientation sensing member adapted to distinguish between a high-side and a low-side of the borehole along the well path;

a fluid direction member adapted to impede the fluid flow in a first one of the high-side and low-side of the borehole so as to at the same time increase the fluid flow in a second one of the high-side and low-side of the borehole; and

said one portion being one of the low side and high side of the borehole and said another portion being a different one of the low side and high side;

wherein the orientation sensing member is a buoyancy member adapted to self-orient the fluid direction member via buoyancy.

10. The pipe string according to claim 9 , wherein the pipe string is a drill string or work string.

11. The pipe string according to claim 9 , wherein the pipe string is a casing string or liner.

12. The pipe string according to claim 9 , further comprising an activation member for activating the fluid direction member in the well.

13. A method for directing a fluid flow in a horizontal or deviated well via a device for directing a fluid flow in an annulus around a pipe string in a horizontal or deviated well having a borehole defining a well path, the device comprising:

an orientation sensing member adapted to distinguish between a high-side and a low-side of the borehole along the well path;

a fluid direction member adapted to impede the fluid flow in one portion of the annulus so as to at the same time increase the fluid flow in another portion of the annulus;

said one portion being one of the low side and the high side of the borehole and said another portion being a different one of the low side and high side; and

wherein the orientation sensing member is a buoyancy member adapted to self-orient the fluid direction member via buoyancy;

wherein the method comprises:

running the device into the well on a pipe string.

14. The method according to claim 13 , wherein the device further comprises an activation member for activating the fluid direction member in the well, and wherein the method further comprises activating the fluid direction member via the activation member when the device has reached a desired depth in the well.

15. The method according to claim 14 , wherein the device is run into the well on a drill string or on a work string, and wherein the method further comprises the step of:

cleaning at least a portion of the annulus by flowing a cleaning fluid past the activated fluid direction member.

16. The method according to claim 14 , wherein the device is run into the well on a casing string, and wherein the method further comprises:

cementing at least of portion of the annulus by flowing cement past the activated fluid direction member.

17. The method according to claim 14 , wherein the device is run into the well as part of a bottom hole assembly, and wherein the method further comprises:

gravel packing at least a portion of the annulus by flowing a slurry past the activated flow direction member.