Use of micro-electro-mechanical systems MEMS in well treatments

1. A method comprising:

placing a Micro-Electro-Mechanical System (MEMS) sensor in a subterranean formation;

placing a wellbore composition in the subterranean formation, wherein the wellbore composition comprises a drilling fluid, a spacer fluid, or a sealant; and

using the MEMS sensor to detect a location of the wellbore composition.

2. The method of claim 1 wherein the MEMS sensor is used to detect the location of the wellbore composition while the wellbore composition is being placed in the subterranean formation.

3. The method of claim 1 wherein the MEMS sensor is used to detect the location of the wellbore composition after the wellbore composition is placed in the subterranean formation.

4. The method of claim 1 wherein the MEMS sensor determines one or more parameters.

5. The method of claim 4 wherein the one or more parameters comprises a physical parameter.

6. The method of claim 4 wherein the one or more parameters comprises a chemical parameter.

7. The method of claim 1 further comprising the step of using an interrogator to communicate with the MEMS sensor.

8. The method of claim 7 further comprising the step of communicating data from the interrogator to a processor.

9. The method of claim 8 further comprising the step of using the processor to analyze the data.

10. A method comprising:

placing a Micro-Electro-Mechanical System (MEMS) sensor in a subterranean formation;

placing a wellbore composition in the subterranean formation; and

using the MEMS sensor to detect a location of the wellbore composition, wherein the MEMS sensor is placed in a CO 2 injection, storage, or disposal well in the subterranean formation.

11. A method comprising:

placing a Micro-Electro-Mechanical System (MEMS) sensor in a subterranean formation;

placing a wellbore composition in the subterranean formation, wherein the wellbore composition comprises a drilling fluid, a spacer fluid, or a sealant; and

using the MEMS sensor to monitor a condition of the wellbore composition.

12. The method of claim 11 wherein the MEMS sensor is used to monitor the condition of the wellbore composition while the wellbore composition is being placed in the subterranean formation.

13. The method of claim 11 wherein the MEMS sensor is used to monitor the condition of the wellbore composition after the wellbore composition is placed in the subterranean formation.

14. The method of claim 11 wherein the MEMS sensor determines one or more parameters.

15. The method of claim 14 wherein the one or more parameters comprises a physical parameter.

16. The method of claim 14 wherein the one or more parameters comprises a chemical parameter.

17. The method of claim 11 further comprising the step of using an interrogator to communicate with the MEMS sensor.

18. A method comprising:

placing a Micro-Electro-Mechanical System (MEMS) sensor in a subterranean formation;

placing a wellbore composition in the subterranean formation; and

using the MEMS sensor to monitor a condition of the wellbore composition, wherein the MEMS sensor is placed in a CO 2 injection, storage, or disposal well in the subterranean formation.

19. The method of claim 18 further comprising the step of communicating data from the interrogator to a processor.

20. The method of claim 19 further comprising the step of using the processor to analyze the data.

21. A method comprising:

placing one or more Micro-Electro-Mechanical System (MEMS) sensors in a subterranean formation;

placing a wellbore composition in the subterranean formation, wherein the wellbore composition comprises a drilling fluid, a spacer fluid, or a sealant;

using the one or more MEMS sensors to detect a location of at least a portion of the wellbore composition; and

using the one or more MEMS sensors to monitor at least a portion of the wellbore composition.

22. The method of claim 21 further comprising the step of using an interrogator to communicate with at least one of the MEMS sensors.

23. The method of claim 22 further comprising the step of communicating data from the interrogator to a processor.

24. The method of claim 23 further comprising the step of using the processor to analyze the data.

25. A method comprising:

placing one or more Micro-Electro-Mechanical System (MEMS) sensors in a subterranean formation;

placing a wellbore composition in the subterranean formation;

using the one or more MEMS sensors to detect a location of at least a portion of the wellbore composition; and

using the one or more MEMS sensors to monitor at least a portion of the wellbore composition, wherein the MEMS sensor is placed in a CO 2 injection, storage, or disposal well in the subterranean formation.

26. A method comprising:

placing one or more Micro-Electro-Mechanical System (MEMS) sensors in a subterranean formation using a wellbore composition, wherein the one or more MEMS sensors comprise an amount from about 0.001 to about 10 weight percent of the wellbore composition, wherein the wellbore composition comprises a drilling fluid, a spacer fluid, or a sealant.

27. A method comprising:

placing one or more Micro-Electro-Mechanical System (MEMS) sensors in CO 2 injection, storage or disposal well in a subterranean formation; and

monitoring a condition using the one or more MEMS sensors.