Systems and methods for positioning an isolation device in a borehole

1. A borehole isolation device conveyable into a borehole, the borehole isolation device comprising:

a body having an outer diameter; and

an expandable ring is expandable from a first outer diameter that is approximately equal to or smaller than the outer diameter of the body to a second outer diameter that is greater than the outer diameter of the body due to a pressure differential of a fluid outside the body across the expandable ring being greater on the uphole end to create at least a partial seal between the borehole isolation device and an inner surface of the borehole or a casing in the borehole during conveyance to a location in the borehole.

2. The borehole isolation device of claim 1 , wherein the expandable ring is further configured to contract from the second outer diameter towards the first outer diameter when the pressure differential decreases below the level required to create the at least partial seal.

3. The borehole isolation device of claim 1 , wherein the borehole isolation device comprises a dissolvable material.

4. The borehole isolation device of claim 1 , the body comprises a mule shoe and the expandable ring is coupled to the mule shoe.

5. The borehole isolation device of claim 1 , wherein the expandable ring comprises a reduced thickness section at the uphole end portion of the expandable ring.

6. The borehole isolation device of claim 1 , wherein the expandable ring comprises flutes formed on an outer surface of the expandable ring.

7. The borehole isolation devices of claim 6 , wherein the combined cross-sectional area of the flutes is between 0.01 square inches and 3 square inches.

8. The borehole isolation device of claim 1 , further comprising a sealing element and wherein the expandable ring is coupled to the sealing element.

9. The borehole isolation device of claim 1 , wherein the borehole isolation device is conveyable in the borehole using a setting tool comprising an internal bypass fluid flowpath extending from the uphole end to a downhole end of the expandable ring and a seat, wherein the bypass fluid flowpath comprises a pressure control device configured to control the pressure differential across the expandable ring by controlling an amount of the fluid passing through the bypass fluid flowpath during the conveyance into the borehole and wherein the seat is movable relative to the expandable ring to expand the expandable ring to create a seal between the borehole isolation device and the inner surface of the borehole or the casing at the location.

10. A well system for a borehole, comprising:

a tool string configured to travel through the borehole;

a setting tool coupled to the tool string, the setting tool comprising an internal bypass fluid flowpath;

a borehole isolation device coupled to the setting tool, the borehole isolation device comprising:

a body having an outer diameter,

an expandable ring configured such that an outermost portion of an uphole end portion is expandable from a first outer diameter to a second outer diameter that is greater than the first outer diameter due to a pressure differential of a fluid outside the body across the expandable ring being greater on the uphole end to create at least a partial seal between the borehole isolation device and an inner surface of the borehole or a casing in the borehole during conveyance to a location in the borehole;

a pressure control device positioned within the internal bypass fluid flowpath and configured to control the pressure differential across the expandable ring by controlling an amount of the fluid passing through the bypass fluid flowpath during the conveyance into the borehole;

a seat movable relative to the expandable ring to expand the expandable ring to create a seal between the borehole isolation device and an inner surface of the borehole or the casing at the location; and

wherein the bypass fluid flowpath extends across the at least partial seal.

11. The well system of claim 10 , wherein the cross-sectional area of the internal bypass fluid flowpath is between 0.01 square inches and 3 square inches.

12. The well system of claim 10 , wherein the pressure control device comprises a valve, a nozzle, a tube, or a rupture disc.

13. The well system of claim 10 , wherein the expandable ring is further configured to contract from the second outer diameter towards the first outer diameter when when the pressure differential decreases below the level required to create the at least partial seal.

14. The well system of claim 10 , wherein the body of the borehole isolation device comprises a mule shoe and the expandable ring is operatively coupled to the mule shoe.

15. The well system of claim 10 , wherein the borehole isolation device comprises a dissolvable material.

16. The well system of claim 10 , wherein the expandable ring comprises a reduced thickness section at the uphole end portion of the expandable ring.

17. The well system of claim 10 , wherein the expandable ring comprises flutes formed on an outer surface of the expandable ring.

18. The well system of claim 17 , wherein the combined cross-sectional area of the flutes is between 0.01 square inches and 3 square inches.

19. The well system of claim 10 , wherein the borehole isolation device further comprises a sealing element and the expandable ring is operatively coupled to the sealing element.

20. A method comprising:

pumping a borehole isolation device coupled to a setting tool through a borehole by pumping a fluid in the borehole;

controlling a fluid pressure across the expandable ring with a pressure control device of the borehole isolation device located in a bypass fluid flowpath through the setting tool to control the velocity of the borehole isolation device while being pumped through the borehole by controlling an amount of the fluid passing through the bypass fluid flowpath during conveyance of the borehole isolation device to a location in the borehole;

expanding an outermost portion of an expandable ring of the borehole isolation device from a first outer diameter to a second outer diameter that is greater than the first outer diameter of the body due to a pressure differential of the pumped fluid outside the borehole isolation device across the expandable ring being greater on the uphole end to create at least a partial seal between the borehole isolation device and an inner surface of the borehole or a casing in the borehole during conveyance of the borehole isolation device to the location in the borehole; and

expanding the expandable ring by moving a seat relative to the expandable ring to create a seal between the borehole isolation device and the inner surface of the borehole or the casing at the location.

21. The method of claim 20 , wherein the pressure control device comprises a valve, a nozzle, a tube, or a rupture disc.

22. The method of claim 20 , further comprising contracting the expandable ring from the second outer diameter towards the first outer diameter.

23. The method of claim 20 , wherein the expandable ring comprises a reduced thickness section at the uphole end portion of the expandable ring.

24. The method of claim 20 , wherein the expandable ring comprises flutes formed on an outer surface of the expandable ring.