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Exploration Technique: Hydroprobe

Exploration Technique Information
Exploration Group: Drilling Techniques
Exploration Sub Group: Exploration Drilling
Parent Exploration Technique: Exploration Drilling
Information Provided by Technique
Hydrological: Collection of ground water samples for geochemistry and geothermometry
Thermal: Temperature measurements down to 50 m
An exploratory drilling technique focused on collecting geothermal fluid samples from shallow depths at relatively inexpensive costs and low environmental impact.
Other definitions:Wikipedia Reegle

A hydroprobe is a relitively inexpensive and easily portable truck mounted drill rig that can reach up to 50 m depth. The drill rig is direct push technology and drives a 1 ½ inch hollow tube into the ground. This technology allows for a relatively quick and easy method for collecting ground water samples and temperature measurements from up to 50 m depth.[1] This method is easy to permit and leaves very little environmental impact.
Use in Geothermal Exploration
The hydroprobe method is an intermediate step between a 2-M Probe Survey and drilling Thermal Gradient Holes. It is more expensive than a 2-m probe survey but reaches much greater depths and allows for ground water sampling. It is less expensive, time consuming, and has less environmental impact compared to drilling thermal gradient holes but does not reach as great of depths and has limitations because it cannot drill through bedrock. The main goals of a hydroprobe survey is to obtain temperature gradient measurements and groundwater samples for geochemical analysis.[1]
Field Procedures
Hydroprobe truck and equipment [1]

Best Practices
Due to the direct push technology a hydroprobe survey must be conducted over soil, loose sediment, or alluvium.
Potential Pitfalls
• Hydroprobe rig is confined to roads

• This technique cannot penetrate bedrock

  1. 1.0 1.1 1.2 Richard Zehner (U.S. Department of Energy). 2010. Effectiveness of Shallow Temperatures Surveys to Target a Geothermal Reservoir at Previously Explored Site at Mcgee Mountain Nevada. Reno, NV: U.S. Department of Energy.

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