Treatment fluids comprising viscosifying agents and methods of using the same
View Patent ↗Methods include introducing a treatment fluid into a wellbore penetrating a subterranean formation, the treatment fluid including a polymer gel comprising a water-soluble polymer, a biocidal agent in an amount sufficient to viscosify the treatment fluid, and an aqueous base fluid.
1. A method comprising
(i) introducing and mixing a dose of about 100 ppm to about 400 ppm tetrakis (hydroxymethyl) phosphonium sulfate (THPS) into an aqueous base fluid to make a THPS-containing aqueous base fluid,
(ii) mixing about 1,000 ppm to about 5,000 ppm of a water soluble polymer with the THPS-containing aqueous base fluid to form a viscosified composition, wherein, immediately following the mixing of the water soluble polymer with the THPS-containing aqueous base fluid, the viscosified composition has an increased viscosity compared with that of a corresponding baseline composition that is made without introducing THPS into the aqueous base fluid, and
(iii) introducing a treatment fluid comprising the viscosified composition into a wellbore penetrating a subterranean formation,
wherein the water soluble polymer is guar, a guar derivative, or a polyacrylamide.
2. The method of claim 1 , wherein the treatment fluid is a fracturing fluid.
3. The method of claim 1 , wherein the treatment fluid is a polymer flooding fluid.
4. The method of claim 1 , wherein the treatment fluid is a diverting fluid.
5. The method of claim 1 , wherein the treatment fluid is a gravel pack fluid.
6. The method of claim 1 , wherein the treatment fluid is a fluid loss control fluid.
7. The method of claim 1 , wherein the treatment fluid is a perforating fluid.
8. The method of claim 1 , wherein the viscosified composition is a gel.
9. The method of claim 1 , wherein, immediately following the mixing of the water soluble polymer with the THPS-containing aqueous base fluid, the viscosified composition has a viscosity that is at least twice that of a corresponding baseline composition that does not include THPS.
10. The method of claim 1 , wherein the water soluble polymer is hydroxypropyl guar (HPG).
11. The method of claim 10 , wherein, immediately following the mixing of the water soluble polymer with the THPS-containing aqueous base fluid, the viscosified composition has a viscosity that is at least twice that of a corresponding baseline composition that does not include THPS.
12. The method of claim 1 , wherein the mixing of the water soluble polymer with the THPS-containing aqueous base fluid is performed for at least 5 minutes.
13. The method of claim 1 , wherein the method does not comprise contacting the water soluble polymer with a cross linking agent.
14. The method of claim 1 , wherein the viscosified composition is made on the fly such that the treatment fluid is continuously introduced into the wellbore as the viscosified composition is being made.
15. A method comprising
(i) introducing about 100 ppm to about 400 ppm tetrakis (hydroxymethyl) phosphonium sulfate (THPS) and about 1,000 ppm to about 5,000 ppm of a water soluble polymer into an aqueous base fluid to form a combination that consists essentially of THPS, the water soluble polymer, and the aqueous base fluid, and mixing the combination to form a viscosified composition, wherein, immediately following the mixing the viscosified composition has an increased viscosity compared with that of a corresponding baseline composition that is made without introducing THPS, and
(ii) introducing the viscosified composition into a wellbore penetrating a subterranean formation,
wherein the water soluble polymer is guar, a guar derivative, or a polyacrylamide.
16. The method of claim 15 , wherein the viscosified composition is a gel.
17. The method of claim 15 , wherein the water soluble polymer is hydroxypropyl guar (HPG).
18. The method of claim 17 , wherein the viscosified composition is a gel.
19. The method of claim 15 , wherein, immediately following the mixing, the viscosified composition has a viscosity that is at least twice that of a corresponding baseline composition that does not include THPS.
20. The method of claim 17 , wherein, immediately following the mixing, the viscosified composition has a viscosity that is at least twice that of a corresponding baseline composition that does not include THPS.
21. The method of claim 15 , wherein the viscosified composition is made on the fly such that it is continuously introduced into the wellbore as the viscosified composition is being made.