Exploration Technique: Step-out Well
|Exploration Technique Information|
|Exploration Group:||Drilling Techniques|
|Exploration Sub Group:||Exploration Drilling|
|Parent Exploration Technique:||Exploration Drilling|
|Information Provided by Technique|
|Lithology:||Drill cuttings are analyzed to determine lithology and mineralogy|
|Stratigraphic/Structural:||Fractures, faults, and geologic formations that the well passes through are identified and mapped|
|Hydrological:||Identify aquifers, reservoir boundaries, flow rates, fluid pressure, and chemistry|
|Thermal:||Direct temperature measurements from within the reservoir|
A step-out well is a type of exploratory well drilled outside of the known reservoir to search for an extension of the reservoir or even a new nearby reservoir. These wells have a high degree of risk and are also known as a wildcat in the oil and gas industry. They are used to find another productive zone within an already producing field, or to extend the parameters of the known field.
In geothermal exploration a step-out well is used to help define the reservoir and improve the reservoir model.
A step-out well should be drilled where there is some evidence of a permeable formation linked with the main reservoir. The well should be drilled in a location to where if it is an unsuccessful production well it might still be useful as an injection well.
A step-out well may result in lost time and money.
- Liberty Pioneer educational materials. Industry Terms and Definitions [Internet]. 2007. [cited 2013/10/08]. Available from: http://www.libertypioneer.com/definitions.pdf
- Glenn Melosh, John Casteel, Kim Niggeman, Brian Fairbank. 2008. Step-Out Drilling Results at Blue Mountain, Nevada. In: GRC Transactions. GRC Annual Meeting; 2008/10/05; Reno, Nevada. Davis, California: Geothermal Resources Council; p. 49-52
- Blue Mountain Geothermal Area
- Blue Mountain Area
- Colado Geothermal Area
- Coso Geothermal Area
- Rye Patch Area
- San Emidio Desert Area