USE OF TRANSIENT TESTING IN RESERVOIR MANAGEMENT

Transient tests can be used throughout the life of the reservoir to ma nage and to optimize recovery of hydrocarbon fluids. This paper shows applications of various well-testing methods during the exploration, a ppraisal, and primary and secondary recovery phases of field projects. Single-well tests [e.g., drillstem tests (DST's) and buildup tests] a re primarily used during the various stages of field development and p rimary recovery, whereas multiple-well tests (e.g., interference tests ) are most often used during secondary recovery A clear understanding of the type of information obtained from well tests is essential if th is information is to be used properly in managing the reservoir. Examp les are the different values of permeabilities calculated from single- vertical-well, horizontal-well, and multiple-well tests; the values of average reservoir pressures; and the double-porosity parameters calcu lated from tests in naturally fractured reservoirs. The state of the a rt of testing and measurement tools, acquisition systems, and interpre tation methods affects the type of information obtained from well test s and should be considered by the petroleum engineer before results ar e used. The paper presents information to help the engineer use transi ent tests properly and to their fullest extent. Field examples are use d when appropriate.