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Open hole DSTs are conducted with the use of a drilling rig while the well is being drilled. At any time in the drilling process, when a zone of interest requires evaluation a string of DST tools can be attached to the bottom of the drill string and set in place to isolate and evaluate the zone. Similarly in the case of cased hole DSTs the zones of interest can be perforated, and then isolated with the use of a DST string. This temporary completion can be used for production testing to obtain optimum flow rates, stabilized formation pressures and the in situ characteristics of the reservoir.
There are many benefits for an operator in conducting DSTs. The benefits are financial and can be critical to the evaluation and processes for maximum production and return from the given well or field. The information gathered from DSTs allows the operator to evaluate the well before outlaying the cost of running expensive production equipment. These savings can result in staying under budget and completing the full drilling program. For maximum production and returns from a field, the production wells must be drilled with minimum impact or damage to the reservoir. Conducting DSTs gives the operator the data needed to analyse and compare the results pre and post production. This information can be critical in adjusting drilling practices to minimise the impact and damage to the reservoir, ensuring maximum production and life of the field.