Drill Stem Testing is a basic oilfield evaluation tool. DSTís are essential in determining the disposition of current wells and providing reservoir data which can aid in predicting productivity and appropriate well completion techniques.
The primary objective of Drill Stem Testing is to determine the type and rate of production, formation characteristics and conditions. Detailed interpretative analyses of drill stem tests provides vital information such as reservoir characteristics, permeability, virgin reservoir pressures and temperatures, reservoir drawdown and hydrocarbon recoveries. The incorporation of such data into an exploration program proves to be invaluable and essential for an overall perception of fluid migration.
To the explorationist, evaluation of individual DSTís is important to determine if potential zones were fully evaluated or if by-passed hydrocarbons are present. Virgin reservoir pressures as determined by DSTís can be compared to post- simulation results to determine stimulation effectiveness. The application of DSTís in petroleum hydrodynamics is invaluable in delineating reservoir continuity, fluid gradient analysis, fluid migration pathways and pressure regime interpretation.
Applications of DSTís encompasses direct involvement in exploration, exploitation, reservoir engineering, hydrodynamics and drilling analysis.
The best type of data available is HIGH-GRADE data. Drill Stem Testing companies which run the tests provide a brief description of what the test yielded and how it was run. Too often, this information is unreliable at best. This limited information must then be processed by highly skilled analysts to be of any technical use. This process is lengthy and arduous and most importantly it is sensitive in that any error in interpretation leads to very serious errors in production decisions.
AIFE, The American Institute of Formation Evaluation LLC., is a
firm which provides the petroleum industry with over 170,000 DST reports
in the United States, and has analyzed over 430,000 DSTs worldwide. Our team of professional analysts
transform the raw data into high-grade form by calling upon their experience
analyzing tens of thousands of tests. To do this, pressure curves often need
to be digitized so that incremental detail is available for performing
various reservoir calculations which are a part of the high-grade data set.
In addition, the DSTís are categorized according to time tested quality
criteria unique to AIFE, making it possible to conclude facts about test
reliability, reservoir permeability and damage etc., simply by glancing at