Phase 2 Reese River Geothermal Project Slim Well 56-4 Drilling and Testing Page: 3 of 89
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In FY 2005, Western Geothermal Partners, LLC (WGP) was awarded GRED III Cooperative
Funding Agreement # DE-FC36-04GO14344, from USDOE to evaluate the Reese River
geothermal prospect. Cooperative funding for the project was 80% DOE - 20% WGP. In FY
2006, WGP's interest in the four federal geothermal leases which make up the prospect was
acquired by Sierra Geothermal Power, Inc. (SGP) of Olympia, WA. Concurrent with the
acquisition of the Reese River prospect, SGP took over WGP's position as operator of the
GRED III agreement.
In FY 2006, prior to the SGP acquisition, WGP completed and submitted a Phase 1 Final
Technical Report to DOE. The report discussed the Phase 1 activities conducted under the
cooperative funding agreement.
On Feb. 09, 2007, the GRED III funded Reese River 56-4 test well was spudded in Sec. 4, T
23N R 43E. The well reached TD of 1,198 m. on March 17, 2007 and was completed as a
temperature observation well on Jan. 07, 2008.
This report is the Phase 2 Final Technical Report for the GRED III project. Since the well did
not find commercial temperatures or permeability, the well will not be tested further and there
will be no Phase 3 report. In addition to data from well 56-4, stratigraphic data from well RR 13-
4, a non GRED III funded well is also used in this report in order to get a better understanding
on the geology of the prospect.
The following highlights from the full report are synopsized here for the reader's benefit:
o Drilling History - Stuck tools at 450 m, resulted in extended fishing operations
and an eventual side track around the stuck tools.
o 56-4 Hole Lithology - 0 to 18 m - Colluvium, 18 to 261 m - Tertiary Lake Beds,
261 to 344 m - Valmy Fm., 344 to 1198 m - Ordovician Carbonates
o Temperature Logging - 0 to 230 m - 300 C/km, 230 to 370 m - 90 C/km, 370
to 1198m - 50 C/km. A bottom hole temperature of 1241C was recorded.
o Geochemistry - Chemical geothermometers predict 110 C to 155 C for the
reservoir temperature. Temperatures of 150 C were found in RR 13-4.
o Injectivity Testing - Values of the injectivity index are in range of 10 I/s/MPa.
o Geologic Interpretation
Reese River GRED III - Phase 2 Report
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Henkle, William R. & Ronne, Joel. Phase 2 Reese River Geothermal Project Slim Well 56-4 Drilling and Testing, report, June 15, 2008; United States. (digital.library.unt.edu/ark:/67531/metadc902508/m1/3/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.