Patent ID: 9719340
Date: 2017-08-01
CPC Classifications: B01F,E21B

Claim:
1. A method of controlling a proppant concentration in a fracturing fluid that is utilized in stimulation of an underground formation, comprising: supplying a motive fluid flow of liquefied gas at pressure between about 150 to 400 psig to at least one eductor, wherein the liquefied gas is mixed with proppant or proppant slurry in the eductor to form a fracturing fluid, wherein a pressurized proppant reservoir is disposed in a position to supply the proppant slurry to the at least one eductor; varying a pad pressure in the pressurized proppant reservoir from about −30 to 40 psi; and further varying a proppant control valve disposed between the eductor and the pressurized proppant reservoir to control the proppant concentration in a range from about 0.1 to 10 lbs/gal of proppant in the fracturing fluid.