Exploratory Boreholes

From Open Energy Information

GEOTHERMAL ENERGY

Exploration Technique: Exploratory Boreholes

[edit]
"{{{ExplorationCostPerMetric}}}" is not in the list (100 feet cut, 30 foot core, compound, day, element, foot, hour, mile, point, process, ...) of allowed values for the "ExplorationCostPerMetric" property."{{{ExplorationTimePerMetric}}}" is not in the list (job, 10 mile, 10 stn, 100 mile, sq. mile, foot) of allowed values for the "ExplorationTimePerMetric" property.
Exploration Technique Information
Exploration Group: Drilling Techniques
Exploration Sub Group: Exploration Drilling
Parent Exploration Technique: Exploration Drilling
Information Provided by Technique
Lithology: Can provide core or cuttings
Stratigraphic/Structural: Identify stratigraphy and structural features within a borehole
Hydrological: -Water samples can be used for geochemical analysis<br:/>-Fluid pressures can be used to estimate flow rates
Thermal: -Temperatures can be measured within the hole<br:/>-Information about the heat source
Exploratory Boreholes:
An exploratory borehole is drilled for the purpose of identifying the lithological, structural, hydrological, or thermal characteristics of a geothermal resource. Exploratory boreholes are used to locate and roughly define the potential power output of a resource.
Other definitions:Wikipedia Reegle


Introduction
Property "IntroText" (as page type) with input value "Exploratory boreholes are drilled to further define or constrain a particular hydrothermal resource. This could be done before any other drilling or to expand and learn more about the dimensions of an existing geothermal power facility.</br></br>Note: the terms exploratory wells and exploratory boreholes have been used interchangeably in the geothermal and oil and gas industries. Technically the difference is that a borehole does not produce fluid and a well does." contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. Exploratory boreholes are drilled to further define or constrain a particular hydrothermal resource. This could be done before any other drilling or to expand and learn more about the dimensions of an existing geothermal power facility.

Note: the terms exploratory wells and exploratory boreholes have been used interchangeably in the geothermal and oil and gas industries. Technically the difference is that a borehole does not produce fluid and a well does.

Use in Geothermal Exploration
Property "GeoUse" (as page type) with input value "Exploration boreholes can be used for many purposes in the geothermal industry. They can provide critical information about the resource at depth allowing developers to better understand the potential power output from a particular area. Exploratory boreholes are also useful for existing geothermal power facilities interested in expanding their resource. Drilling tends to be the most expensive phase of developing a geothermal resource; so many other exploration techniques are done prior to exploratory drilling (Jennejohn, 2009; FIGA, 2011). However, drilling is the only way to verify that the resource is capable of producing sufficient hydrothermal fluids for power generation." contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. Exploration boreholes can be used for many purposes in the geothermal industry. They can provide critical information about the resource at depth allowing developers to better understand the potential power output from a particular area. Exploratory boreholes are also useful for existing geothermal power facilities interested in expanding their resource. Drilling tends to be the most expensive phase of developing a geothermal resource; so many other exploration techniques are done prior to exploratory drilling (Jennejohn, 2009; FIGA, 2011). However, drilling is the only way to verify that the resource is capable of producing sufficient hydrothermal fluids for power generation.
Related Techniques
Property "Subcategories" (as page type) with input value "Thermal gradient holes (TGH) may be drilled prior to any other drilling techniques. TGH are typically narrow and shallow, but can still locate anomalous geothermal gradients, and depending on the drilling conditions, they are often cost effective (Jennejohn, 2009).</br></br>A pressure temperature log is generated from a tool sent down a hole, similar to TGH, but accounts for other properties. A pressure temperature log can be done in an exploratory borehole. See Pressure Temperature Log to learn more about this technique.</br></br></br></br></br>* Exploration Drilling</br>** Core Holes</br>** Exploratory Boreholes</br>** Exploratory Well</br>** Hydroprobe</br>** Microhole Array</br>** Slim Holes</br>** Step-out Well</br>** [[:Thermal Gradient Holes|Thermal Gradient Holes" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. Thermal gradient holes (TGH) may be drilled prior to any other drilling techniques. TGH are typically narrow and shallow, but can still locate anomalous geothermal gradients, and depending on the drilling conditions, they are often cost effective (Jennejohn, 2009).

<br:/>A pressure temperature log is generated from a tool sent down a hole, similar to TGH, but accounts for other properties. A pressure temperature log can be done in an exploratory borehole. See Pressure Temperature Log to learn more about this technique.








References
Federal Interagency Geothermal Activities, 2011, http://www1.eere.energy.gov/geothermal/pdfs/ngap.pdf<br:/>Jennejohn, 2009, http://www.novoco.com/energy/resource_files/reports/geo_rd_1209.pdf


[edit]



    {{}}

    Retrieved from "https://openei.org/w/index.php?title=Exploratory_Boreholes&oldid=687500"