Prematurely Terminated Slug Tests—A Field Applicationby Kenzi Karasaki, Lawrence Berkeley Lab, Berkeley, United States,
Abstract: Slug tests suffer problems of non-uniqueness to a greater extent than other well tests. Alternatively, a prematurely terminated slug test (PTST) or a systematized drillstem test is proposed, where a slug test is terminated in the midpoint of the flow period, and the subsequent shut-in data are recorded and analyzed. This method requires a downhole shut-in device and a pressure transducer, which is no more than the conventional deep-well slug testing. As opposed to slug tests, which are ineffective when a skin is present, more accurate estimation of formation permeability can be made using a PTST. Premature termination also shortens the test duration considerably. Because in most cases no more information is gained by completing a slug test to the end, the author recommends that conventional slug tests be replaced by the premature termination technique. An example application of the PTST analysis technique is presented using the field data. The analysis indicated that the formation permeability may be as much as one order of magnitude larger than the value based on a no-skin analysis.
Subject Headings: Drilling | Data analysis | Field tests | Information management | Geology | Hydraulic fracturing | Reservoirs | Wells (water)
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