Downhole Techniques

From Open Energy Information

GEOTHERMAL ENERGY

Exploration Technique: Downhole Techniques

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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
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
Property "IntroText" (as page type) with input value "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.'"`UNIQ--ref-00000000-QINU`"'</br>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.'"`UNIQ--ref-00000001-QINU`"' 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.'"`UNIQ--ref-00000002-QINU`"' </br>Well logs provide information on physical properties versus depth while well testing enables an understanding of the behavior of the reservoir." contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. 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
Property "GeoUse" (as page type) with input value "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.'"`UNIQ--ref-00000003-QINU`"' Since the measurements are collected in-situ within the well, downhole techniques are capable of accurately constraining these reservoir parameters relative to depth.'"`UNIQ--ref-00000004-QINU`"'</br>Gaining an understanding of these reservoir parameters greatly assists in the exploration, resource assessment and reservoir confirmation phases of geothermal energy development.'"`UNIQ--ref-00000005-QINU`"'" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. 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]
Related Techniques
Property "Subcategories" (as page type) with input value "* Downhole Techniques</br>** Borehole Seismic Techniques</br>*** Single-Well And Cross-Well Seismic Imaging</br>*** Vertical Seismic Profiling</br>** Formation Testing Techniques</br>** Well Log Techniques</br>*** Acoustic Logs</br>**** Cement Bond Log</br>**** Cross-Dipole Acoustic Log</br>*** Caliper Log</br>*** Chemical Logging</br>*** Density Log</br>*** Gamma Log</br>*** Image Logs</br>*** Mud Logging</br>*** Neutron Log</br>*** Pressure Temperature Log</br>*** Single-Well and Cross-Well Resistivity</br>*** Spontaneous Potential Well Log</br>** Well Testing Techniques</br>*** Downhole Fluid Sampling</br>*** Earth Tidal Analysis</br>*** Flow Test</br>*** Injectivity Test</br>*** Static Temperature Survey</br>*** Stress Test</br>*** Tracer Testing</br>*** [[:Vertical Flowmeter Test|Vertical Flowmeter Test" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. * Downhole Techniques






References
  1. ↑ 1.0 1.1 1.2 (Keys, 1990) "Borehole Geophysics Applied to Ground-Water Investigations"
  2. ↑ 2.0 2.1 (Sanyal et al., 1980) "Geothermal Well Log Interpretation: State of the Art"
  3. ↑ (Glenn et al., 1982) "Review of Well Logging in the Basin and Range Known Geothermal Resource Areas"


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      Document #Analysis
      Type      		ApplicantGeothermal
      Area      		Lead
      Agency      		District
      Office      		Field
      Office      		Mineral
      Manager      		Surface
      Manager      		Development
      Phase(s)      		Techniques
      BLM-NV-WN-ES-08-01-1310, NV-020-08-01EANevada Geothermal PowerBlue Mountain Geothermal AreaBureau of Land ManagementBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/Power PlantDownhole Techniques
      Well Testing Techniques
      Drilling Techniques
      Development Drilling
      DOI-BLM-NV-C010-2010-0006-EAEAOrmat Technologies IncGabbs Valley Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationDownhole Techniques
      Well Testing Techniques
      Drilling Techniques
      Exploration Drilling
      DOI-BLM-NV-C010-2010-0008-EAEAMagma EnergySoda Lake Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationDownhole Techniques
      Well Testing Techniques
      Drilling Techniques
      Exploration Drilling
      DOI-BLM-NV-C010-2010-0010-EAEATerra-Gen Power LLCDixie Valley Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/ExplorationDownhole Techniques
      Well Testing Techniques
      Drilling Techniques
      Exploration Drilling
      DOI-BLM-NV-C010-2012-0029-EAEAOrmat Technologies IncTungsten Mountain Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/Well FieldDownhole Techniques
      Well Testing Techniques
      Drilling Techniques
      Exploration Drilling
      DOI-BLM-NV-W010-2012-0057-EAEABrady Power PartnersBrady Hot Springs Geothermal AreaBureau of Land ManagementBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/Well FieldDownhole Techniques
      DOI-BLM-NV-W010–2012–0005–EAEATerra-Gen Power LLCNew York Canyon Geothermal AreaBureau of Land ManagementBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/Well Field
      Geothermal/Power Plant
      Geothermal/Grid Connection      		Downhole Techniques
      Development Drilling


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