Downhole Techniques

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Exploration Technique: Downhole Techniques

Exploration Technique Information
Exploration Group: Downhole Techniques
Exploration Sub Group: None
Parent Exploration Technique: Exploration Techniques
Information Provided by Technique
Lithology: Determination of lithology, grain size
Stratigraphic/Structural: Thickness and geometry of rock strata, fracture identification
Hydrological: Porosity, permeability, water saturation
Thermal: Formation temperature with depth
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Downhole Techniques:
Downhole techniques are measurements collected from a borehole environment which provide information regarding the character of formations and fluids intersected by a well. These petrophysical data are fundamental to developing the understanding of a geothermal reservoir.
Other definitions:Wikipedia Reegle


 
Introduction
The first downhole measurements are generally attributed to the Schlumberger brothers who developed the first geophysical resistivity log in 1927, followed by the spontaneous potential log in 1931. However, the earliest recorded well log was obtained by Lord Kelvin in 1869 with the collection of downhole temperature measurements.[1]

Downhole measurements have become commonplace for any exploration or production well drilled because these data provide a relatively cost-effective means to evaluate a prospect.[2] Through borehole measurements, it is possible to obtain a vast amount of information which is not necessarily accessible from surface measurements, drill cuttings, and core sampling alone.[1]

Well logs provide information on physical properties versus depth while well testing enables an understanding of the behavior of the reservoir.
 
Use in Geothermal Exploration
Downhole measurements can be interpreted to allow the determination of rock type, formation thickness, porosity, permeability, resistivity, bulk density, fracture zones, fluid characteristics and fluid saturation.[1] Since the measurements are collected in-situ within the well, downhole techniques are capable of accurately constraining these reservoir parameters relative to depth.[2]

Gaining an understanding of these reservoir parameters greatly assists in the exploration, resource assessment and reservoir confirmation phases of geothermal energy development.[3]














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      Document # Analysis
      Type
      Applicant Geothermal
      Area
      Lead
      Agency
      District
      Office
      Field
      Office
      Mineral
      Manager
      Surface
      Manager
      Development
      Phase(s)
      Techniques
      BLM-NV-WN-ES-08-01-1310, NV-020-08-01 EA Nevada Geothermal Power Blue Mountain Geothermal Area BLM BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Power Plant Development Drilling
      Downhole Techniques
      Drilling Techniques
      Well Testing Techniques
      DOI-BLM-NV-C010-2010-0006-EA EA Ormat Technologies Inc Gabbs Valley Geothermal Area BLM BLM Carson City District Office BLM Stillwater Field Office BLM BLM Geothermal/Exploration Downhole Techniques
      Drilling Techniques
      Exploration Drilling
      Well Testing Techniques
      DOI-BLM-NV-C010-2010-0008-EA EA Magma Energy Soda Lake Geothermal Area BLM BLM Carson City District Office BLM Stillwater Field Office BLM BLM Geothermal/Exploration Downhole Techniques
      Drilling Techniques
      Exploration Drilling
      Well Testing Techniques
      DOI-BLM-NV-C010-2010-0010-EA EA Terra-Gen Power LLC Dixie Valley Geothermal Area BLM BLM Carson City District Office BLM Stillwater Field Office BLM BLM Geothermal/Exploration Downhole Techniques
      Drilling Techniques
      Exploration Drilling
      Well Testing Techniques
      DOI-BLM-NV-C010-2012-0029-EA EA Ormat Technologies Inc Tungsten Mountain Geothermal Area BLM BLM Carson City District Office BLM Stillwater Field Office BLM BLM Geothermal/Well Field Downhole Techniques
      Drilling Techniques
      Exploration Drilling
      Well Testing Techniques
      DOI-BLM-NV-W010-2012-0057-EA EA Brady Power Partners Brady Hot Springs Geothermal Area Bureau of Land Management BLM Winnemucca District Office BLM Humboldt River Field Office Bureau of Land Management Bureau of Land Management Geothermal/Well Field Downhole Techniques
      DOI-BLM-NV-W010–2012–0005–EA EA Terra-Gen Power LLC New York Canyon Geothermal Area BLM BLM Winnemucca District Office BLM Humboldt River Field Office BLM BLM Geothermal/Power Plant
      Geothermal/Grid Connection
      Geothermal/Well Field
      Development Drilling
      Downhole Techniques


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