Frac fluids for far field diversion
Aqueous well treatment fluids especially suited for use in far field diversion in low viscosity carrier fluids comprise water, a friction reducer, and a diverter. The diverter comprises dissolvable particulates and proppants. The dissolvable particulates have a specific gravity of from about 0.9 to about 1.6 and a particle size of about 50 mesh or less. The proppants have a specific gravity of from about 0.9 to about 1.4 and a particle size of from about 20 to about 100 mesh. The dissolvable particulates have a higher specific gravity and a smaller particle size than the proppant.
1. A method of enhancing production from a subterranean formation in a well, the method comprising:
(a) providing an aqueous carrier fluid, the aqueous carrier fluid comprising water and a friction reducer, the friction reducer selected from the group consisting of polyacrylamides and derivatives, copolymers, and mixtures thereof;
(b) adding a diverter to the aqueous carrier fluid, the diverter comprising:
(1) dissolvable particulates having a specific gravity of from about 0.9 to about 1.6, the dissolvable particulates consisting essentially of dissolvable particulates having a particle size of about 100 mesh or less; and
(2) proppants having a specific gravity of from about 0.9 to about 1.4 within a selected range, the proppants consisting essentially of proppants having a particle size of about 20 mesh to about 100 mesh; and
(3) the dissolvable particulates also having a specific gravity greater than or equal to the specific gravity of the proppants and a smaller particle size than the proppants; and
(c) pumping the aqueous carrier fluid with the diverter into the formation.
2. The method of claim 1 , wherein pumping of the aqueous carrier fluid with the diverter into the formation includes pumping the fluid during a hydraulic fracturing operation.
3. The method of claim 1 , wherein the aqueous carrier fluid comprises a surfactant.
4. The method of claim 1 , wherein the ratio of the specific gravity of the dissolvable particulates to the specific gravity of the proppant is from about 1 to about 1.6.
5. The method of claim 1 , wherein the ratio of the specific gravity of the dissolvable particulates to the specific gravity of the proppant is from about 1 to about 1.3.
6. The method of claim 1 , wherein the aqueous carrier fluid has a viscosity of about 12 cps or less.
7. The method of claim 1 , wherein the aqueous carrier fluid has a viscosity of about 8 cps or less.
8. The method of claim 1 , wherein the ratio of the maximum particle size of the proppant to that of the dissolvable particulates is from about 1.5 to about 8.
9. The method of claim 1 , wherein the ratio of the maximum particle size of the proppant to that of the dissolvable particulates is from about 2 to about 6.
10. The method of claim 1 , wherein the dissolvable particulates have a specific gravity of from about 1 to about 1.4.
11. The method of claim 1 , wherein the dissolvable particulates are composed of polylactic acid.
12. The method of claim 1 , wherein the proppants are thermoset polymer beads having nanofillers.
13. The method of claim 1 , wherein the adding the diverter includes loading of the diverter in a range from about 0.1 to about 10 ppa.
14. The method of claim 13 , wherein the loading of the diverter is in a range from about 0.2 to about 5 ppa.
15. The method of claim 13 , wherein the loading of the diverter is in a range from about 0.5 to about 2 ppa.
16. The method of claim 1 , wherein the ratio of the dissolvable particulates to the proppants by weight is from about 80:20 to about 20:80.
17. The method of claim 1 , wherein the ratio of the dissolvable particulates to the proppants by weight is from about 60:40 to about 40:60.
18. A method of enhancing production from a subterranean formation in a well, the method comprising:
(a) providing an aqueous carrier fluid, the aqueous carrier fluid comprising water and a friction reducer, the friction reducer is selected from the group consisting of polyacrylamides and derivatives, copolymers, and mixtures thereof;
(b) adding a diverter to the aqueous carrier fluid, the diverter comprising:
(1) dissolvable particulates having a specific gravity of from about 1 to about 1.6, the dissolvable particulates consisting essentially of dissolvable particulates having a particle size of about 100 mesh or less; and
(2) proppants having a specific gravity of from about 1 to about 1.1, the proppants consisting essentially of proppants having a particle size of from about 30 mesh to about 80 mesh; and
(3) the dissolvable particulates also having a specific gravity greater than or equal to the specific gravity of the proppants and a smaller particle size than the proppants; and
(c) pumping the aqueous carrier fluid with the diverter into the formation.
19. The method of claim 18 , wherein the aqueous carrier fluid comprises a surfactant, and wherein the adding the diverter includes loading of the diverter in a range from about 0.1 to about 10 ppa, and wherein the ratio of the dissolvable particulates to the proppants by weight is from about 80:20 to about 20:80.
20. The method of claim 18 , wherein the ratio of the specific gravity of the dissolvable particulates to the specific gravity of the proppant is from about 1 to about 1.6, and wherein the aqueous carrier fluid has a viscosity of about 12 cps or less.
21. The method of claim 18 , wherein the ratio of the maximum particle size of the proppant to that of the dissolvable particulates is from about 1.5 to about 8.
22. The method of claim 18 , wherein the dissolvable particulates have a specific gravity of from about 1 to about 1.4.
23. The method of claim 22 , wherein the dissolvable particulates comprise polylactic acid.
24. The method of claim 18 , wherein the proppants are thermoset polymer beads having nanofillers.
25. A method of enhancing production from a subterranean formation in a well, the method comprising:
(a) providing an aqueous carrier fluid, the aqueous carrier fluid comprising water and a friction reducer, the friction reducer selected from the group consisting of polyacrylamides and derivatives, copolymers, and mixtures thereof;
(b) adding a diverter to the aqueous carrier fluid in a range from about 0.1 to about 10 ppa, the diverter comprising:
(1) dissolvable particulates having a specific gravity of from about 1 to about 1.6, the dissolvable particulates consisting essentially of dissolvable particulates having a particle size of about 100 mesh or less; and
(2) proppants having a specific gravity of from about 1 to about 1.1, the proppants consisting essentially of proppants having a particle size of from about 30 mesh to about 80 mesh; and
(3) the dissolvable particulates also having a specific gravity greater than or equal to the specific gravity of the proppants and a smaller particle size than the proppants, the ratio of the dissolvable particulates to the proppants by weight is from about 80:20 to about 20:80; and
(c) pumping the aqueous carrier fluid with the diverter into the formation.
26. The method of claim 25 , wherein the ratio of the specific gravity of the dissolvable particulates to the specific gravity of the proppant is from about 1 to about 1.6, and wherein the aqueous carrier fluid has a viscosity of about 12 cps or less.
27. The method of claim 25 , wherein the ratio of the maximum particle size of the proppant to that of the dissolvable particulates is from about 1.5 to about 8.
28. The method of claim 25 , wherein the dissolvable particulates have a specific gravity of from about 1 to about 1.4, and wherein the dissolvable particulates comprise polylactic acid.