{"id":2431,"date":"2019-10-02T19:52:38","date_gmt":"2019-10-02T19:52:38","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/the-desert-peak-east-egs-project-a-progress-report\/"},"modified":"2020-02-24T18:17:34","modified_gmt":"2020-02-24T18:17:34","slug":"the-desert-peak-east-egs-project-a-progress-report","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/the-desert-peak-east-egs-project-a-progress-report\/","title":{"rendered":"The Desert Peak East EGS Project: A progress report"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Enhanced Geothermal System\u201d (EGS) power generation project on the eastern side<br \/>\nof the Desert Peak geothermal field. An existing well (23-1) is the focus of much of<br \/>\nthe investigation, including re-interpretation of lithology, acquisition and analysis of<br \/>\na wellbore image log, injection testing, performing a \u201cmini-frac\u201d to determine the<br \/>\nmagnitude of the least principal stress, and re-completing the well in preparation for<br \/>\nlater hydraulic stimulation. Numerical modeling has been undertaken to estimate<br \/>\nheat recovery and make generation forecasts for various stimulated volumes and<br \/>\nwell configurations.<br \/>\nThe target formations for hydraulic stimulation in well 23-1 lie below an unstable<br \/>\nphyllite which bottoms at about 1,740 m (5,700 feet). The formations beneath this<br \/>\nunit include a section of Jurassic\/Triassic metamorphic rocks (of which the phyllite is<br \/>\na part) and an underlying, younger (Cretaceous?), massive granodiorite that<br \/>\nintrudes the older rocks above. This granodiorite unit extends from 2,140 m (7,020<br \/>\nfeet) to total depth of 23-1 (2,939 m or 9,641 feet), and is likely to have considerable<br \/>\nlateral extent. Analysis of the distribution and orientation of natural fractures and<br \/>\nborehole failure features (tensile fractures and breakouts) from an image log in well<br \/>\n23-1 indicate that the direction of the maximum horizontal stress is between N28\u00b0E<br \/>\nand N38\u00b0E and a predominance of NNE-striking fractures. Both observations reflect<br \/>\nthe current stress field as indicated by regional and local geologic data. A stress<br \/>\nmodel was developed to permit an evaluation of the pore pressure increase required<br \/>\nto initiate shear failure on optimally oriented pre-existing fractures. The stress field<br \/>\nanalysis, in conjunction with lithology, mineralogy, drilling rate and geophysical log<br \/>\ndata, have been used to identify the deeper section of the granodiorite as the most<br \/>\nprospective interval for stimulation.<br \/>\nWork remaining to be completed in Phase I includes the \u201cmini-frac\u201d and re-completion<br \/>\nof well 23-1 in preparation for hydraulic stimulation. Future plans for the<br \/>\nproject in Phase II focus on planning, conducting, monitoring and evaluating a massive<br \/>\nhydraulic stimulation of well 23-1. Should the stimulation result in the creation of<br \/>\na large enough reservoir, additional drilling, stimulation and testing would be conducted.<br \/>\nA recent additional focus of the project involves evaluating the feasibility of<br \/>\nstimulating a non-commercial well drilled in the hydrothermal portion of the field.<\/p>\n","protected":false},"featured_media":4717,"comment_status":"closed","ping_status":"closed","template":"","meta":{"pmpro_default_level":""},"product_cat":[154],"product_tag":[],"_links":{"self":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product\/2431"}],"collection":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/comments?post=2431"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4717"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2431"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2431"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}