Method of treating produced or flowback water with nucleophilic agent to deactivate breaker

1. A method comprising:

(a) mixing produced water or flowback water from an underground reservoir with a sulfur or phosphorus containing nucleophilic agent, wherein the produced water or flowback water comprises a viscosifying polymer or a remnant thereof and a vitamin B 1 breaker, an ylide breaker or both a vitamin B 1 breaker and an ylide breaker;

(b) deactivating the vitamin B 1 breaker, ylide breaker or both vitamin B 1 breaker and glide breaker with the sulfur or phosphorus containing nucleophilic agent to render recyclable water; and

(c) pumping the recyclable water into the underground reservoir.

2. The method of claim 1 , wherein the underground reservoir is a gas well, an oil well, or a geothermal well.

3. The method of claim 1 , wherein the sulfur or phosphorus containing nucleophilic agent has at least one set of lone pair electrons.

4. The method of claim 1 , wherein the sulfur or phosphorus containing nucleophilic agent is an inorganic compound.

5. The method of claim 4 , wherein the sulfur or phosphorus containing nucleophilic agent contains sulfur.

6. The method of claim 5 , wherein the sulfur containing nucleophilic agent is a sulfite or a bisulfate.

7. The method of claim 6 , wherein the sulfur or phosphorus containing nucleophilic agent is a solution of sodium sulfite.

8. The method of claim 1 , wherein the viscosifying polymer is (i) a synthetic polymer selected from the group consisting of polyvinyl alcohols, polyacrylates, polypyrrolidones and polyacrylamides; or (ii) a polysaccharide selected from the group consisting of cellulosic derivatives, galactomannan or a galactomannan derivative, xanthan, succinoglycan and scleroglucan; and mixtures thereof.

9. The method of claim 8 , wherein the polysaccharide is selected from the group consisting of guar gum, hydroxypropylguar, carboxymethylguar, carboxymethylhydroxypropylguar, xanthan gum and scleroglucan.

10. The method of claim 1 , wherein the viscosifying polymer is at least partially crosslinked.

11. A method of treating a fluid of reduced viscosity after a subterranean formation penetrated by a well has been fractured by a hydraulic fracturing operation using a fracturing fluid, the fracturing fluid comprising a viscosifying polymer and a vitamin B 1 breaker, an ylide breaker or both a vitamin B 1 breaker and an ylide breaker, the method comprising:

(a) reducing the viscosity of the fracturing fluid by at least partially degrading the viscosifying polymer with the vitamin B 1 , ylide or both vitamin B 1 and ylide to provide the fluid with reduced viscosity;

(b) deactivating vitamin B 1 , ylide or both vitamin B 1 and ylide within the fluid of reduced viscosity by adding to the fluid of reduced viscosity a sulfur or phosphorus containing nucleophilic agent

wherein the fluid of reduced viscosity is produced water or flowback water.

12. The method of claim 11 , wherein the produced water or flowback water is removed from the well prior to deactivation of vitamin B 1 , ylide or both vitamin B 1 and ylide with the sulfur or phosphorus containing nucleophilic agent.

13. The method of claim 11 , wherein the sulfur or phosphorus containing nucleophilic agent has a lone pair of electrons.

14. The method of claim 11 , wherein the sulfur containing nucleophilic agent is a sulfite or bisulfate.

15. A method of treating produced or flowback water comprising residual viscosifying polymer, the method comprising

(a) adding vitamin B 1 , an ylide or both vitamin B 1 and an ylide to the produced or flowback water and reducing the viscosity of the produced or flowback water; and

(b) adding a sulfur or phosphorus containing nucleophilic agent to the produced or flowback water to deactivate the vitamin B 1 , ylide or both vitamin B 1 and ylide.

16. A method of stimulating a subterranean formation penetrated by a well comprising:

(a) pumping into the well a well treatment fluid comprising a first viscosifying polymer and vitamin B 1 , an ylide or both vitamin B 1 and an ylide at a pressure sufficient to create or initiate a fracture;

(b) reducing the viscosity of the well treatment fluid with the vitamin B 1 , ylide or both vitamin B 1 and ylide;

(c) flowing produced water or flowback water from the well;

(d) deactivating the vitamin B 1 , ylide or both vitamin B 1 and ylide within the produced water or flowback water by adding to the produced water or flowback water a sulfur or phosphorus containing nucleophilic agent;

(e) adding a second viscosifying polymer to the produced water or flowback water to render a second treatment fluid and pumping the second treatment fluid into the well at a pressure sufficient to create or initiate a fracture within the formation.

17. The method of claim 16 , wherein the second treatment fluid further comprises a breaker.

18. The method of claim 17 , wherein the sulfur or phosphorus containing nucleophilic agent has a lone pair of electrons.

19. The method of claim 16 , wherein the sulfur containing nucleophilic agent is a sulfite.