Drill stem Test18 Oct 2020 14:10
GP.
A drill stem test may be carried out during the drilling operation to determine whether petroleum is present in the target formations.
A DST is a short duration test to provide an initial analysis of the petroleum composition and it's flow characteristics within the formation. The initial information obtained during the DST will be used to inform a decision whether to run casing across the formation and, if so, to establish a more detailed and specific longer term testing programme, often referred to as an extended well test.
In order to perform a DST, a packer will be run on drill pipe and set immediately above the formation being tested to provide isolation from the well bore. The formation will then be flowed, with fluids being flowed to surface through the drill pipe.
Once at surface, fluids will be diverted by temporary pipework to a 3 phase separator, which will separate out oil, gas and produced liquids. Oil and produced liquids will be diverted via temporary pipework to dedicated storage tanks onsite for subsequent offsite removal for sale or disposal respectively. Oil will be transported by a licenced haulier to a permitted refinery for sale. Any natural gas separated during the 3 phase separation will be diverted by temporary pipework to a ground flare located onsite for incineration.
Taken from the Rathlin West Newton B Site Condition Report.