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Title: Cavitation-based hydro-fracturing technique for geothermal reservoir stimulation

A rotary shutter valve 500 is used for geothermal reservoir stimulation. The valve 500 includes a pressure chamber 520 for holding a working fluid (F) under pressure. A rotatable shutter 532 is turned with a powering device 544 to periodically align one or more windows 534 with one or more apertures 526 in a bulkhead 524. When aligned, the pressurized working fluid (F) flows through the bulkhead 524 and enters a pulse cavity 522, where it is discharged from the pulse cavity 522 as pressure waves 200. The pressure wave propagation 200 and eventual collapse of the bubbles 202 can be transmitted to a target rock surface 204 either in the form of a shock wave 206, or by micro jets 208, depending on the bubble-surface distance. Once cavitation at the rock face begins, fractures are initiated in the rock to create a network of micro-fissures for enhanced heat transfer.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1344498
Assignee:
UT-Battelle, LLC ORNL
Patent Number(s):
9,574,431
Application Number:
14/224,367
Contract Number:
AC05-00OR22725
Resource Relation:
Patent File Date: 2014 Mar 25
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 42 ENGINEERING; 15 GEOTHERMAL ENERGY

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