The objective of this work is to generate a selection matrix that contributes to the decision making, contemplating all the necessary technical criteria to ensure that the information gathering is adequate and the Pressure Transient Analysis (PTA) could be advantageous for the reservoir characterization and the determination of well productivity parameters.

For this scrutiny we analyzed more than 500 well tests from 100 fields in Mexico and other parts of the world, onshore and offshore, carbonates and terrigenous, and different types of fluids (black oil – extra heavy, heavy, intermediate and light, volatile oil, retrograde gas and condensates, wet gas and dry gas), from which all the pressure responses obtained were compared in order to identify every associated problem and the causes that originated them from the design, execution and finally, during the interpretation of the PTA.

The importance of this work lies in improving the PTA through the allocation of different numerical values for each of the controlling factors involved at reservoir, well and at surface level, depending on its own impact on the results, so we classify them in Well Evaluation Conditions (WEC) and Reservoir Evaluation Conditions (REC).

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