Methods of reducing lost circulation in a wellbore

1. A method of reducing lost circulation comprising:

introducing a lost circulation solution comprising Saudi Arabian volcanic ash, a curing agent, and a resin into a subsurface formation through a wellbore, wherein the Saudi Arabian volcanic ash comprises SO 3 , CaO, SiO 2 , Al 2 O 3 , Fe 2 O 3 , MgO, and K 2 O and has a particle size of from 300 to 800 μm; and

allowing the lost circulation solution to thicken within the subsurface formation, thereby forming a geopolymer barrier between the subsurface formation and the wellbore to reduce lost circulation.

2. The method of claim 1 , wherein the lost circulation solution comprises from 50 to 90 wt. % resin.

3. The method of claim 1 , wherein the resin comprises phenol, furan, epoxy, urethane, phenol-formaldehyde, polyester, vinyl ester, urea aldehyde, novolac, resole, bisphenol-A-epichlorohydrin epoxy resin or combinations thereof.

4. The method of claim 1 , wherein the lost circulation solution comprises from 1 to 5 wt. % curing agent.

5. The method of claim 1 , wherein the curing agent comprises a crosslinker.

6. The method of claim 5 , wherein the crosslinker comprises diethylenetriamine, hexamethylenetetramine, paraformaldehyde, oxazolidines, melamine resins, aldehyde donors, resole polymers, or combinations thereof.

7. The method of claim 1 , wherein the lost circulation solution comprises from 9 to 45 wt. % Saudi Arabian volcanic ash.

8. The method of claim 1 , wherein the Saudi Arabian volcanic ash is free of TiO 2 .

9. The method of claim 1 , wherein the Saudi Arabian volcanic ash comprises from 40 wt. % to 50 wt. % SiO 2 and from 10 wt. % to 20 wt. % Al 2 O 3 .

10. The method of claim 1 , wherein the Saudi Arabian volcanic ash comprises:

from 0.05 wt. % to 0.2 wt. % SO 3 ;

from 5 wt. % to 10 wt. % CaO;

from 40 wt. % to 50 wt. % SiO 2 ;

from 10 wt. % to 20 wt. % Al 2 O 3 ;

from 10 wt. % to 15 wt. % Fe 2 O 3 ;

from 5 wt. % to 10 wt. % MgO; and

from 0.5 wt. % to 5 wt. % K 2 O.

11. The method of claim 1 , wherein the lost circulation solution further comprises an aqueous solution.

12. The method of claim 11 , wherein the aqueous solution comprises deionized water, tap water, fresh water, salt water, natural or synthetic brine, municipal water, formation water, produced water, well water, filtered water, distilled water, sea water, or combinations thereof.

13. The method of claim 11 , wherein the lost circulation solution further comprises a cement precursor material comprising one or more components selected from the group consisting of calcium hydroxide, silicates, belite (Ca 2 SiO 5 ), alite (Ca 3 SiO 4 ), tricalcium aluminate (Ca 3 Al 2 O 6 ), tetracalcium aluminoferrite (Ca 4 Al 2 Fe 2 O 10 ), brownmillerite (4CaO.Al 2 O 3 .Fe 2 O 3 ), gypsum (CaSO 4 .2H 2 O), sodium oxide, potassium oxide, lime (calcium oxide), hexavalent chromium, trivalent chromium, calcium aluminate, and combinations thereof.

14. The method of claim 1 , wherein the lost circulation solution further comprises one or more additives selected from the group consisting of dispersants, fluid loss control agents, retarders, expansion additives, antifoaming agents, stabilisers, accelerators, extenders, weighting agents, lost circulation control agents, surfactants, gypsum, hematite, manganese tetroxide, silica flour, and silica sand.

15. The method of claim 1 , wherein the lost circulation solution has a thickening time of less than 12 hours.

16. The method of claim 1 , wherein the lost circulation solution has a thickening time of less than 5 hours.