Earth metal peroxide fluidized compositions
Disclosed is an alkaline earth metal peroxide concentrate, or fluidized suspension, for addition to aqueous hydraulic fracturing fluids to efficiently decrease the viscosity of the hydrated, hydrophilic polysaccharide polymer in the system. The concentrate comprises a hydrophobic, water insoluble liquid, an organophilic clay suspension agent, a polar activator, a sparingly-soluble alkaline earth metal peroxide, and an anionic surfactant. Advantageously, these concentrations, or suspensions, exhibit high flash points, making them easier to transport using commercial transportation means.
1. A composition consisting of:
a hydrophobic liquid selected from one or more chemically manufactured Group IV and Group V category base oils, as classified by the American Petroleum Institute, and combinations thereof,
an organophilic clay suspension agent,
a polar activator,
a sparingly-soluble alkaline earth metal peroxide, and
an anionic surfactant.
2. The composition of claim 1 , wherein the hydrophobic liquid is water insoluble.
3. The composition of claim 1 , wherein the suspension agent is an organophilic clay.
4. The composition of claim 1 , wherein the polar activator is propylene carbonate.
5. The composition of claim 1 , wherein the earth metal peroxide is calcium peroxide, magnesium peroxide, or a mixture thereof.
6. The composition of claim 1 , wherein the hydrophobic liquid is present in an amount which is:
a) at least from about 20 vol. % to about 90 vol. % of the total composition volume, and
b) is sufficient to obtain a flash point greater than 200° F. for the peroxide/synthetic fluid composition when tested in accordance with ASTM D-93.
7. The composition of claim 1 , wherein the composition exhibits a flash point greater than 200° F. when tested in accordance with ASTM D-93.
8. A thermally stable composition for use in hydrocarbon recovery operations, the composition consisting of:
a hydrophobic fluid selected from a Group IV (API), Group V (API), or both a Group IV and a Group V category oil;
a sparingly-soluble metal peroxide; and
a surfactant;
wherein the hydrophobic fluid has a kinematic viscosity at 40° C. ranging from about 2 cSt and about 10 cSt.
9. The thermally stable composition of claim 8 , wherein the hydrophobic fluid has a kinematic viscosity at 40° C. ranging from about 6 cSt to about 8 cSt.
10. The thermally stable composition of claim 8 , wherein the composition exhibits a flash point greater than about 200° F. when tested in accordance with ASTM D-93.
11. The thermally stable composition of claim 8 , wherein the sparingly-soluble metal peroxide is calcium peroxide, magnesium peroxide, or a mixture thereof.
12. The thermally stable composition of claim 8 , wherein the surfactant is an anionic surfactant.
13. The thermally stable composition of claim 8 , wherein the composition exhibits a heat output of 60 μW/g or less as determined by Thermal Activity Monitoring at 40° C. over 20 hours.
14. A well treatment fluid consisting of:
a Group IV (API) or Group V (API) fluid;
at least one sparingly-soluble metal peroxide; and
an effective amount of a surfactant,
wherein the fluid exhibits a flash point of 200° F. or more when tested in accordance with ASTM D-93.
15. The well treatment fluid of claim 14 , wherein the metal peroxide is calcium peroxide, magnesium peroxide, or a mixture thereof.
16. The well treatment fluid of claim 14 , wherein the surfactant is an anionic surfactant.