• Freddy Humberto Escobar Universidad Surcolombiana, Av. Pastrana – Cra. 1, Neiva, Huila, Colombia
  • Yuly Andrea Hernández Columbus Energy Sucursal Colombia, Bogotá
  • Djebbar Tiab The University of Oklahoma, 100 E. Boyd St., Norman, OK, 73019, USA
Keywords: reservoir, pressure, well testing, reservoir drainage area, pseudosteady state, TDS Technique.


In this work, the conventional cartesian straight-line pseudosteady-state solution and the Total Dissolved Solids (TDS) solution to estimate reservoir drainage area is applied to constant-pressure reservoirs to observe its accuracy. It was found that it performs very poorly in such systems, especially in those having
rectangular shape. On the other hand, the pseudosteady-state solution of the TDS technique performs better in constant-pressure systems and may be applied only to regular square- or circular-shaped reservoirs with a resulting small deviation error. Therefore, new solutions for steady-state systems in circular, square and rectangular reservoir geometries having one or two constant-pressure boundaries are developed, compared and successfully verified with synthetic and real field cases. Automatic matching performed by commercial software sometimes are so time consuming and tedious which leads to another reason to use the proposed equations.


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Escobar, F. H., Hernández, Y. A., & Hernández, C. M. (2007). Pressure Transient Analysis for Long Homogeneous Reservoirs using TDS Technique. J. Petrol. Sci. Eng., 58, Issue 1 (2): 68-82.

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Tiab, D. (1993). Analysis of Pressure and Pressure Deriva tive without Type-Curve Matching: 1- Skin Factor and Wellbore Storage. Paper SPE 25423 presented at the Production Operations Symposium held in Oklahoma City, OK, Mar. 21-23, 1993. P. 203-216. Also, J. Petrol. Sci. Eng., 12 (1995): 171-181.

Tiab, D. (1994). Analysis of Pressure Derivative without Type-Curve Matching: Vertically Fractured Wells in Closed Systems. J. Petrol. Sci. Eng., 11 (1994): 323-333.

How to Cite
Escobar, F. H., Hernández, Y. A., & Tiab, D. (2010). DETERMINATION OF RESERVOIR DRAINAGE AREA FOR CONSTANTPRESSURE SYSTEMS USING WELL TEST DATA. CT&F - Ciencia, Tecnología Y Futuro, 4(1), 51-62.


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