Exploration Drilling

From Open Energy Information

Exploration Technique: Exploration Drilling

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"{{{ExplorationCostPerMetric}}}" is not in the list of possible values (100 feet cut, 30 foot core, compound, day, element, foot, hour, mile, point, process, sample, sq. mile, station, Subject, well) for this property.



"{{{ExplorationTimePerMetric}}}" is not in the list of possible values (job, 10 mile, 10 stn, 100 mile, sq. mile, foot) for this property.



Exploration Technique Information
Exploration Group: Drilling Techniques
Exploration Sub Group: Exploration Drilling‎
Parent Exploration Technique: Drilling Techniques
Information Provided by Technique
Lithology: Identify lithology and mineralization, provide core samples and rock cuttings
Stratigraphic/Structural: Retrieved samples can be used to identify stratigraphy and structural features such as fracture networks or faults
Hydrological: -Water samples can be used for geochemical analysis

-Fluid pressures can be used to estimate flow rates

Thermal: -Temperatures can be measured within the hole

-Thermal conductivity measurements can be done on retrieved samples.

Dictionary.png
Exploration Drilling:
Exploratory drilling is the Initial phase of drilling for the purpose of determining the physical properties and boundaries of a reservoir.
Other definitions:Wikipedia Reegle


 
Introduction
"Exploration drilling is an important step before development drilling should take place. Exploration drilling is essential for obtaining actual temperature measurements, rock samples, and retrieving fluid samples for chemical analysis. Geophysical methods can give valuable and useful information about the subsurface, which is very important when determining the best locations for drilling; however, in order to obtain actual temperature and fluid measurements, samples need to be obtained via exploratory drilling.

There are several different exploratory drilling techniques: core holes, exploratory wells, slim holes, and thermal gradient holes. These exploratory drilling methods are used because they are far less expensive than drilling a full sized production well. Exploratory drilling utilizes drill holes which are normally not as deep, smaller, and quicker to drill compared to production and injection wells. This allows for important subsurface data to be gathered at less cost so better informed decisions can be made about how to proceed in development.

Exploration drilling provides the most accurate information during the exploration phase, but it is also the most expensive method, in many cases it is the final phase of exploration." cannot be used as a page name in this wiki.
Exploration drilling is an important step before development drilling should take place. Exploration drilling is essential for obtaining actual temperature measurements, rock samples, and retrieving fluid samples for chemical analysis. Geophysical methods can give valuable and useful information about the subsurface, which is very important when determining the best locations for drilling; however, in order to obtain actual temperature and fluid measurements, samples need to be obtained via exploratory drilling.

There are several different exploratory drilling techniques: core holes, exploratory wells, slim holes, and thermal gradient holes. These exploratory drilling methods are used because they are far less expensive than drilling a full sized production well. Exploratory drilling utilizes drill holes which are normally not as deep, smaller, and quicker to drill compared to production and injection wells. This allows for important subsurface data to be gathered at less cost so better informed decisions can be made about how to proceed in development. Exploration drilling provides the most accurate information during the exploration phase, but it is also the most expensive method, in many cases it is the final phase of exploration.

 
Use in Geothermal Exploration
"Exploratory drilling is essential for determining if a geothermal reservoir is capable of producing sufficient hydrothermal fluids for power generation. Exploratory drilling is used for building accurate reservoir models based on hard evidence from what is observed down hole. Exploratory drilling can define reservoir boundaries, estimate production potentials, characterize the subsurface geology, and provide essential fluid geochemical data." cannot be used as a page name in this wiki.
Exploratory drilling is essential for determining if a geothermal reservoir is capable of producing sufficient hydrothermal fluids for power generation. Exploratory drilling is used for building accurate reservoir models based on hard evidence from what is observed down hole. Exploratory drilling can define reservoir boundaries, estimate production potentials, characterize the subsurface geology, and provide essential fluid geochemical data.
 
Related Techniques
"<br>

  • Exploration Drilling
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    Field Procedures
    The given value was not understood.
    Field procedures vary depending on which type of exploratory drilling is being done. Typically a drill rig for exploratory drilling is much smaller and portable compared to production well drill rigs. The figure below is an example of a drill rig for drilling core holes
    Drilling for core samples in New Zealand [1]
     
    Environmental Mitigation Measures
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    Exploratory drilling requires a small amount of land for the drilling area. Roads are usually required in order to transport the drill rig and other equipment to the site. In environmentally sensitive areas such as rain forest or endangered species habitats precautions need to be taken before exploratory drilling can commence because small amounts of deforestation may be required and noise may disturb native species. Exploration drilling may make aquifers more vulnerable to degradation and contamination by connecting aquifers at different elevations and by potentially allowing surface water to enter the aquifers. Suitable precautions will differ from site to site.[2] Wetlands and waterways are also susceptible to exploratory drilling. Unless preventative measures are taken there is potential for contamination from drilling fluids draining into nearby water supplies and entering the environment. An understanding of the hydrogeology of the area is necessary before exploratory drilling should take place.


     
    Best Practices
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    For all drilling operations careful planning is a critical step before drilling begins. Many factors need to be taken into consideration, such as geographic location, drilling equipment, cost, schedule, well parameters, etc. Drilling near a source of water is often very beneficial otherwise water for the drilling mud has to be transported to the site which can be very expensive.[3] Site accessibility is also very important to take into consideration. Large trucks carrying heavy equipment need to have reasonable access to the site and there needs to be enough space at the site for all the equipment and supplies. Drilling during calm times of the year is very important; climate extremes of hot and cold and high precipitation can affect the mud system, the equipment, and make work condition miserable, ultimately resulting in slower drilling progress and higher expenses.[3]
     
    Potential Pitfalls
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    Exploratory drilling is the most expensive part of exploration and often times it can be difficult to predict the costs due to unexpected problems associated with drilling. Loss of drilling fluid is the most common and expensive problem during exploratory drilling and accounts for over 20% of the costs in exploratory wells.[3] Another pitfall of exploratory drilling is the unpredictability of a well. Some wells can be unstable and collapse or have cementing problems or blowouts which can result in lost effort, time, and money.



     
    References
    1. SonicSampDrill. Geotechnical Drilling in New-Zealand [Internet]. 2013. [cited 2013/10/01]. Available from: http://www.sonicsampdrill.com/news/geotechnical-drilling-in-new-zealand.htm
    2. Government of Western Australia (Department of Mines and Petroleum). 2002. Guidelines for the Protection of Surface and Groundwater Resources During Exploration Drilling. N\A: N/A.
    3. 3.0 3.1 3.2 John Finger,Doug Blankenship (Sandia National Laboratories). 2010. Handbook of Best Practices for Geothermal Drilling. Albuquerque, New Mexico: Sandia National Laboratories. Report No.: SAND2010-6048.


    No exploration activities found.



        Document #Analysis
        Type
        ApplicantGeothermal
        Area
        Lead
        Agency
        District
        Office
        Field
        Office
        Mineral
        Manager
        Surface
        Manager
        Development
        Phase(s)
        Techniques
        DOI-BLM-CA-170-02-15EAMammoth PacificLong Valley Caldera Geothermal AreaBLMBLM Central California District OfficeBLM Bishop Field OfficeBLMGeothermal/ExplorationDrilling Methods
        Exploration Drilling
        Exploratory Well
        Slim Holes
        DOI-BLM-CA-EA-2002-???EACalpine Corporation (Calpine) and CPN Telephone Flat Inc. (CPN)Glass Mountain Geothermal AreaBLMBLMBLMGeothermal/Well FieldExploration Drilling
        Thermal Gradient Holes
        DOI-BLM-ID-220-2009-EA-3709EAAgua Caliente, LLCRaft River Geothermal AreaBLMBLM Twin Falls District OfficeBurley Field OfficeBLMBLMGeothermal/ExplorationExploration Drilling
        DOI-BLM-NV-B020-2011-0026-EAEARam PowerSilver Peak Geothermal AreaBLMBLM Battle Mountain District OfficeBLMBLMGeothermal/ExplorationWell Testing Techniques
        Drilling Techniques
        Exploration Drilling
        DOI-BLM-NV-C010-2010-0006-EAEAOrmat Technologies IncGabbs Valley Geothermal AreaBLMBLM Carson City District OfficeBLM Stillwater Field OfficeBLMBLMGeothermal/ExplorationDownhole Techniques
        Well Testing Techniques
        Drilling Techniques
        Exploration Drilling
        DOI-BLM-NV-C010-2010-0008-EAEAMagma EnergySoda Lake Geothermal AreaBLMBLM Carson City District OfficeBLM Stillwater Field OfficeBLMBLMGeothermal/ExplorationDownhole Techniques
        Well Testing Techniques
        Drilling Techniques
        Exploration Drilling
        DOI-BLM-NV-C010-2010-0010-EAEATerra-Gen Power LLCDixie Valley Geothermal AreaBLMBLM Carson City District OfficeBLM Stillwater Field OfficeBLMBLMGeothermal/ExplorationDownhole Techniques
        Well Testing Techniques
        Drilling Techniques
        Exploration Drilling
        DOI-BLM-NV-C010-2011-0001-EAEATerra-Gen Power LLCCoyote Canyon Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBureau of Land ManagementGeothermal/Power PlantWell Testing Techniques
        Observation Wells
        Exploration Drilling
        DOI-BLM-NV-C010-2011-0501-EAEAGradient ResourcesPatua Geothermal AreaBLMBLM Carson City District OfficeBLM Sierra Front Field Office
        BLM Stillwater Field Office
        BLMBLM
        Bureau of Reclamation
        Geothermal/Well FieldWell Testing Techniques
        Development Drilling
        Exploration Drilling
        DOI-BLM-NV-C010-2012-0029-EAEAOrmat Technologies IncTungsten Mountain Geothermal AreaBLMBLM Carson City District OfficeBLM Stillwater Field OfficeBLMBLMGeothermal/Well FieldDownhole Techniques
        Well Testing Techniques
        Drilling Techniques
        Exploration Drilling
        DOI-BLM-NV-W010-2010-0004-EAEATerra-Gen Power LLCNew York Canyon Geothermal AreaBLMBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBLMBLMGeothermal/ExplorationWell Testing Techniques
        Exploration Drilling
        DOI-BLM-NV-W010-2011-0001-EAEAOrmat Technologies IncGrass Valley Geothermal AreaBLMBLM Winnemucca District OfficeBLM Humboldt River Field OfficeBLMBLMGeothermal/Exploration
        Geothermal/Well Field
        Well Testing Techniques
        Development Drilling
        Exploration Drilling
        DOI-BLM-OR-P000-2010-0003-EAEADavenport Power LLCNewberry Caldera Geothermal AreaBLMBLM Prineville District OfficeBLMUnited States Forest ServiceGeothermal/ExplorationWell Testing Techniques
        Drilling Techniques
        Exploration Drilling
        Seismic Techniques
        Passive Seismic Techniques
        DOI-BLM-UT-W020-2010-042-EAEAOrmat Technologies IncDrum Mountain Geothermal AreaBLMBLM West Desert District OfficeBLMBLMGeothermal/ExplorationDevelopment Drilling
        Exploration Drilling
        EA-NV-030-07-006EAOrmat Technologies IncCarson Lake Corral Geothermal AreaBureau of Land ManagementBLM Carson City District OfficeBLM Stillwater Field OfficeBureau of Land ManagementBLM
        Bureau of Reclamation
        Geothermal/Well FieldExploration Drilling
        Slim Holes
        Thermal Gradient Holes
        NEPA Process for Geothermal Power Plants in the Deschutes National ForestEISCal EnergyNewberry Caldera Geothermal AreaUSFS
        BLM
        Geothermal/Exploration
        Geothermal/Well Field
        Geothermal/Power Plant
        Exploration Drilling
        Exploratory Boreholes
        Production Wells
        Thermal Gradient Holes


        <metadesc> About Exploration Drilling, a geothermal exploration technique, including areas of use. </metadesc>