Frac plug and method for fracturing a formation

1. A downhole barrier having a component thereof comprising a spalling material, wherein the spalling material comprises a cementitious material, an aggregate, and a ductility modifying agent; and the downhole barrier spalls upon phase transitioning free water in the spalling material or upon unbinding water in the spalling material, wherein downhole barrier further comprises a device capable of generating a temperature change therein or a material capable of undergoing an exothermic reaction, to initiate phase transitioning free water in the spalling material.

2. A downhole barrier as claimed in claim 1 wherein both

a mandrel; and

a cone, comprise the spalling material.

3. The downhole barrier as claimed in claim 2 further including a slip, and an element.

4. The downhole barrier as claimed in claim 3 wherein the slip comprises a spalling material.

5. The downhole barrier as claimed in claim 3 further including a pusher.

6. The downhole barrier as claimed in claim 3 wherein the pusher comprises a spalling material.

7. A method for destabilizing a barrier in a borehole comprising;

initiating a threshold temperature of a barrier as claimed in claim 1 whereat the barrier spalls.

8. The method as claimed in claim 7 wherein the initiating includes phase transitioning free water in the spalling material.

9. The method as claimed in claim 7 wherein the initiating includes unbinding water in the material.

10. The method as claimed in claim 7 wherein the initiating includes creating a thermal gradient in the spalling material.

11. The method as claimed in claim 7 wherein the initiating is allowing ambient downhole temperature to raise the barrier to the threshold temperature.

12. The method as claimed in claim 7 wherein the initiating is by pumping a fluid having a different temperature to the barrier.

13. The method as claimed in claim 7 wherein the initiating is by applying a selected temperature to the barrier using a device capable of generating a temperature change therein.

14. The method as claimed in claim 13 wherein the device is electrically activated.

15. The method as claimed in claim 13 wherein the device is a heater.

16. The method as claimed in claim 7 wherein the initiating is by causing an exothermic chemical reaction at the barrier.

17. A borehole system comprising:

a borehole in a subsurface formation;

a barrier as claimed in claim 1 disposed in the borehole.

18. The borehole system as claimed in claim 17 further including a string in the borehole, the barrier being disposed in the string.

19. The downhole barrier as claimed in claim 1 , wherein the downhole barrier undergoes explosive spalling upon phase transitioning free water in the spalling material or upon unbinding water in the spalling material.