This results in more effective heat mining of hot rocks, lowering development risk and increasing the productive life of a project. Multiple micro-holes allows a larger volume of rock to be accessed by working fluids via more flow paths, increases the probability of intersecting open fractures, and reduces ‘short circuiting’ of working fluids within the Enhanced Geothermal System reservoir. A directional array is drilled from the primary wellbore in order to intersect natural or induced fractures in the reservoir, allowing fluids to access more surface area for more efficient heat mining of the geothermal resource.
#Core drill series
Micro-hole array are a series of hundreds of small-diameter directional boreholes that can be drilled with diameters of less than 4”. This technology allows for a relatively quick and easy method for collecting samples and temperature measurements from up to 50 m depth. The drill rig pushes a 1 ½ inch hollow tube into the ground.
#Core drill portable
Exploratory boreholes are also useful for existing geothermal power facilities interested in expanding their resource.Ī hydro-probe is a relatively inexpensive and easily portable truck mounted drill rig that can reach up to 50 m depth.
They can provide critical information about the resource at depth allowing developers to better understand the potential power output from a particular area. Coring is slower and more expensive.Įxploration boreholes can be used for many purposes in the geothermal industry. A special drill bit is used for coring that excavates and preserves a tubular section of rock. The core samples are brought up to surface and need to be preserved properly since it undergoes tremendous changes in pressure and temperature, which can result in volatiles escaping from the rock mass or some minerals to rapidly undergo alteration. The most widely used exploration techniques are listed below:Ĭore holes are drilled to document the sub-surface lithology, mineralisation, fault networks, porosity, permeability etc at different depth intervals. Trenching provides accurate near-surface data and the possibility of collecting samples of large volume for testing. When the top of a deposit intersects the surface, or outcrops, shallow trenches may be excavated with a bulldozer or backhoe. There are several exploratory drilling techniques and methods in use, depending on the type of deposit and its proximity to the surface.
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