Split stream oilfield pumping systems

1. A method of pumping an oilfield fluid from a well surface to a wellbore comprising:

operating at least one pump to pump a diluted stream to a common manifold positioned at the well surface;

operating at least one other pump to pump a concentrated stream to the common manifold, said concentrated stream comprising a proppant disposed in a fluid carrier having a proppant concentration of at least 2 pounds per gallon; and

combining the diluted stream and the concentrated stream in the common manifold to form the oilfield fluid, and

introducing the oilfield fluid to the wellbore.

2. The method of claim 1 , wherein the at least one pump is a same type of pump as the at least one other pump.

3. The method of claim 2 , wherein the at least one pump and the at least one other pump are each a plunger pump.

4. The method of claim 1 , wherein the at least one pump is a different type of pump from the at least one other pump.

5. The method of claim 4 , wherein the at least one pump is a multistage centrifugal pump and the at least one other pump is a plunger pump.

6. The method of claim 5 , wherein the at least one pump is a progressing cavity pump and the at least one other pump is a plunger pump.

7. The method of claim 1 , wherein more pumps are operated than other pumps.

8. The method of claim 1 , wherein the proppant concentration is about 10 pounds per gallon.

9. The method of claim 1 , wherein the oilfield fluid is a fracturing fluid.

10. The method of claim 1 , wherein the proppant is one of a particle, a fiber and a material having a manufactured shape.

11. A system for pumping an oilfield fluid from a well surface to a wellbore, said system comprising, at the well surface:

a water source;

a gel maker receiving water from the water source and adapted to mix the water and a gelling agent;

a first stream comprising at least one of Nitrogen and Carbon Dioxide;

a second stream comprising a proppant, the gelling agent, and water;

a common manifold that is connected to the first stream and the second stream, said common manifold combining the first stream and the second stream to form the oilfield fluid.

12. The system of claim 11 , wherein the water source is a water tank at the well surface for supplying water to at least one of the first stream and second stream.

13. The system of claim 12 , further comprising at least one pump at the well surface for pumping the first stream to the common manifold, wherein said at least one pump is connected to the water tank at one end and to the common manifold at another end.

14. The system of claim 13 , wherein the at least one pump is selected from a group comprising a multistage centrifugal pump, a progressing cavity pump, and a plunger pumps.

15. The system of claim 13 , further comprising a blender at the well surface that receives a mixture of the water and the gelling agent from the gel maker and further combines the mixture with the proppant to form the second stream.

16. The system of claim 15 , further comprising at least one other pump at the well surface for pumping the second stream to the common manifold, wherein said at least one other pump is connected to the blender at one end and to the common manifold at another end.

17. The system of claim 16 , wherein the at least one other pump is a plunger pump.

18. The system of claim 11 , wherein the common manifold is further connected to the wellbore for introducing the oilfield fluid into the wellbore.

19. The system of claim 11 , wherein a proppant concentration of the proppant in the second stream is at least 2 pounds per gallon.

20. The system of claim 11 , wherein the second stream further comprises at least one of a foam stabilizer, a pH changer, a corrosion preventer, a scale inhibitor, and a detergent.