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. An aqueous well treatment fluid, said well treatment fluid comprising:
(a) water;
(b) a friction reducer;
(c) a diverter, said diverter comprising:
i) 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
ii) proppants having a specific gravity of from about 0.9 to about 1.4, the proppants consisting essentially of proppants having a particle size of from about 20 to about 100 mesh; and
iii) wherein said dissolvable particulates have a higher specific gravity and a smaller particle size than said proppants.
2. The fluid of claim 1 , where the ratio of said specific gravity of said dissolvable particulates to said specific gravity of said proppant is from greater than 1 to about 1.6.
3. The fluid of claim 1 , where the ratio of said specific gravity of said dissolvable particulates to said specific gravity of said proppant is from about greater than 1 to about 1.3.
4. The fluid of claim 1 , wherein said fluid has a viscosity of about 12 cps or less.
5. The fluid of claim 1 , wherein said fluid has a viscosity of about 8 cps or less.
6. The fluid of claim 1 , wherein the ratio of the maximum particle size of said proppant to that of said dissolvable particulates is from about 1.5 to about 8.
7. The fluid of claim 1 , wherein the ratio of the maximum particle size of said proppant to that of said dissolvable particulates is from about 2 to about 6.
8. The fluid of claim 1 , wherein said dissolvable particulates have a specific gravity of from about 1 to about 1.4.
9. The fluid of claim 1 , wherein said dissolvable particulates have a specific gravity of from about 1.2 to about 1.3.
10. The fluid of claim 1 , wherein said dissolvable particulates are composed of polylactic acid.
11. The fluid of claim 1 , wherein said proppant particulates have a specific gravity of from about 1 to about 1.1 and a particle size of from about 30 mesh to about 80 mesh.
12. The fluid of claim 1 , wherein said proppants are thermoset polymer beads having nanofillers.
13. The fluid of claim 1 , wherein the loading of said diverter is from about 0.1 to about 10 ppa.
14. The fluid of claim 1 , wherein the loading of said diverter is from about 0.2 to about 5 ppa.
15. The fluid of claim 1 , wherein the loading of said diverter is from about 0.5 to about 2 ppa.
16. The fluid of claim 1 , wherein the ratio of said dissolvable particulates to said proppants by weight is from about 80:20 to about 20:80.
17. The fluid of claim 1 , wherein the ratio of said dissolvable particulates to said proppants by weight is from about 60:40 to about 40:60.
18. The fluid of claim 1 , wherein said friction reducer is selected from the group consisting of polyacrylamides and derivatives, copolymers, and mixtures thereof.
19. The fluid of claim 1 , wherein said fluid comprises a surfactant.
20. A method of enhancing production from a subterranean formation in a well, said method comprising:
(a) providing the fluid of claim 1 ; and
(b) pumping said fluid into said formation.
21. The method of claim 20 , wherein said method is a method of fracturing said formation.
22. A method of enhancing production from a subterranean formation in a well, said method comprising:
(a) providing an aqueous carrier fluid;
(b) adding a diverter to said carrier fluid, said diverter comprising:
i) 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
ii) proppants having) a specific gravity of from about 0.9 to about 1.4, the proppants consisting essentially of proppants having a particle size of from about 20 mesh to about 100 mesh; and
iii) wherein said dissolvable particulates have a higher specific gravity and a smaller particle size than said proppants proppant; and
(c) pumping said carrier fluid with said diverter into said formation.