Abstract

At first, four misconceptions found in the current state-of-art of the oil well testing are revised in detail in this paper. A mathematical demonstration, a historical review and a field example are presented to support these four technical observations: (1) The wrong use of the volumetric factor B in the actual pseudosteady-state flow equations. (2) The use of semi-empirical correlations, like those of Vogel, Fetkovich or Wiggins, to analyze IPR curves. (3) The calculation of the maximum oil flow rate potential of a well at a wellbore pressure of zero. (4) The historically rooted paradigm of underestimating the Deliverability Tests capacity to determine reservoir properties.

Then, the revision of these four wrong paradigms conveys to the introduction of a new approach for obtaining reservoir information: the “Productivity State Analysis”. The most promissory feature of this new Well Testing approach is the opportunity that it opens to obtain the information through tubinghead pressures measurements.

Finally, two ambitious applications of these surface tests for the industry are proposed: (a) the pre- and post- evaluation of every workover/stimulation job, and (b) the periodic Productivity-State-Analysis of reservoirs. This last kind of reservoir evaluation could both improve dramatically our actual understanding of their complex dynamic reality and give us an index value for our efficiency in producing from them.

Introduction

To improve the efficiency in both the production of the wells and the exploitation of the reservoirs, it is indispensable to obtain opportune key-information about them. In this paper, after the discussion of four technical observations to the current Well Testing state-of-art, a new Well Testing approach is presented to determine key well-reservoir information from tubinghead measurements, which means low-cost tests and the opportunity to evaluate greater amounts of wells.

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