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1. (WO2017176268) PRESSURE-EXCHANGER TO ACHIEVE RAPID CHANGES IN PROPPANT CONCENTRATION

Pub. No.:    WO/2017/176268    International Application No.:    PCT/US2016/026380
Publication Date: Fri Oct 13 01:59:59 CEST 2017 International Filing Date: Fri Apr 08 01:59:59 CEST 2016
IPC: E21B 43/25
E21B 43/267
C09K 8/80
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: LEWIS, Bryan John
STEPHENSON, Stanley V.
NGUYEN, Philip D.
DUSTERHOFT, Ronald Glen
Title: PRESSURE-EXCHANGER TO ACHIEVE RAPID CHANGES IN PROPPANT CONCENTRATION
Abstract:
A method that includes introducing a first fluid at a first flow rate into a first end of a channel of a hydraulic energy transfer system, introducing a second fluid at a second flow rate into a second end of the channel opposite the first end, wherein the first flow rate is lower than the second flow rate, and operating the hydraulic energy transfer system to output a third fluid comprising the first fluid and a portion of the second fluid and exhibiting a step-change in concentration of the first fluid. The first fluid is proppant slurry introduced at a first pressure, the second fluid is a clean fluid introduced at a second pressure higher than the first pressure, and third fluid is a fracturing fluid exhibiting the step-change in proppant concentration. The hydraulic energy transfer system includes a rotary isobaric pressure exchanger.