The objective of this study is to analyze the performance of non-conventional wells drilled in Hassi-Messaoud field, Algeria. A new technique "Direct Synthesis" developed by Dr. D. Tiab1, 2  is used for the pressure transient analysis. It permits the determination of permeability tensor as well as the effective length of the horizontal well. Hence, and for the first time, the permeability tensor (Kx, Ky, Kz), and the vertical permeability anisotropy (Kv/Kh) were obtained. The results of the interpretations lead to a verity of information and correlations. Sensitivity studies allow the optimization of future horizontal drilling plannings.

The comparison between the performances of slanted, horizontal, and multilateral wells shows that slanted wells, regarding the low risk, are the most appropriate for Hassi-Messaoud field. From the spatial distribution of permeabilities, Kx, Ky, Kz, important conclusions are illustrated regarding the geological model of the field.

Horizontal wells are not only beneficial for improving productivity but also for the tremendous amount of information they provide. Form this study several recommendations are issued regarding the well spacing taking into account different geological models.

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