Immobile proppants
The present invention relates to a plurality of proppants, wherein at least a portion of the proppants are immobile proppants and are immobile in a proppant pack. The proppants, pre-aggregated proppants, immobile proppants, or any combination thereof can be used for fracking of a well for hydrocarbon recovery. A method of producing, immobilizing, localizing, or any combination thereof a plurality of proppants is provided by the present invention. The present invention also provides a method of immobilizing proppants including flowing a plurality of proppants into a subterranean location, and fusing the plurality of proppants to each other, to a subterranean surface, or a combination thereof to immobilize the plurality of proppants. The fusing can be accomplished using a chemical reaction, physical interaction, cross-linking, polymerization, microwave sintering, surface diffusion, magnetism, colloid destabilization, mechanical entanglement, interlocking, in-situ dimpling, or any combination thereof.
1. A method of placing a proppant pack comprising:
introducing a salt solution into a wellbore to establish a salt environment in the wellbore;
thereafter, introducing into the wellbore a colloid solution comprising a plurality of suspended proppants, wherein the proppants comprise a glass-ceramic and a shell, wherein the glass-ceramic has a coefficient of thermal expansion within 10% of a coefficient of thermal expansion of the shell, wherein the glass-ceramic portion of the plurality of proppants comprises crystallites having a random orientation and a degree of crystallinity from about 5.0% to about 100%; and
contacting the colloid solution with the salt solution in the wellbore and allowing the salt solution to destabilize the colloid solution such that at least a portion of the plurality of proppants flocculate and form the proppant pack.
2. The method of claim 1 , wherein the immobile proppants are further immobilized by a chemical reaction between adjacent proppants, wherein about 5.0 wt % to about 95 wt % of the immobile proppants are attached.
3. The method of claim 2 , wherein the chemical reaction is cross-linking.
4. The method of claim 1 , wherein the immobile proppants are further immobilized by microwave sintering.
5. The method of claim 1 , wherein the immobile proppants are further immobilized by surface diffusion.
6. The method of claim 4 , wherein the microwave sintering comprises shaping proppants into twins, triplets, quartets, quintets, sextets, septets, octets, higher-order linked proppants, or any combination thereof.
7. The method of claim 1 , wherein the immobile proppants are further immobilized by ferromagnetism, paramagnetism, superparamagnetism, or any combination thereof.
8. The method of claim 1 , wherein the immobile proppants are further immobilized by colloid destabilization near or at the site of a well bore to aggregate the proppants.
9. The method of claim 1 , wherein the immobile proppants are further immobilized by mechanical entangling, interlocking of the proppants, or both.
10. The method of claim 1 , wherein the immobile proppants are further immobilized by in situ dimpling of the proppants.
11. The method of claim 1 , wherein the immobile proppants are further immobilized by passing through a conduit adapted to cause immobilizing of proppants.
12. The method of claim 11 , wherein the conduit is functionalized with at least one chemical group.
13. The method of claim 12 , wherein the at least one chemical group is capable of initiating a reaction with proppants that flow through said conduit, such that the proppants become immobilized after exiting the conduit.
14. The method of claim 13 , wherein the immobile proppants are chemically cross-linked to each other as a result of passing through the conduit.
15. The method of claim 11 , wherein the immobile proppants are formed by passing through the conduit, and microwave sintering occurs, at least partially, in said conduit, wherein the conduit is constructed such that the conduit is capable of providing microwaves to the proppant flowing through.
16. The method of claim 11 , wherein the conduit comprises a ceramic coating that is capable of initiating a physical or chemical reaction with proppants that flow through said conduit, such that the proppants become immobilized after exiting the conduit.
17. The method of claim 11 , wherein the conduit comprises an organic coating that is capable of initiating a physical or chemical reaction with proppants that flow through said conduit, such that the proppants become immobilized after exiting the conduit.
18. The method of claim 11 , wherein the conduit comprises a polymer coating that is capable of initiating a physical or chemical reaction with proppants that flow through said conduit, such that the proppants become immobilized after exiting the conduit.
19. The method of claim 11 , wherein the conduit comprises a conversion coating that is capable of initiating a physical or chemical reaction with proppants that flow through said conduit, such that the proppants become immobilized after exiting the conduit.
20. The method of claim 19 , wherein the conversion coating comprises at least one ceramic, at least one polymer, at least one zinc compound, at least one zincate, at least one phosphate, at least one chromate, or any combination thereof.
21. The method of claim 11 , wherein at least one of the conduit and the immobile proppants comprises a magnetic material.