I. Mazouzi¹, A. Deghmoum¹, Atmane Azzouguen¹, A. Oudjida²

(1) Sonatrach Inc, Hydra Alger, Algeria
(2) Anadarko Algeria Corp, N/A, Algeria

ABSTRACT: How Can Horizontal Wells Help in Natural Fractures Reservoir Characterization?

The information obtained from the testing horizontal wells are very important, in this paper the experience of horizontal wells in the gas reservoir of TIN FOUYE, Algeria is presented, as well as the contribution in characterizing natural fractures.

The transient response (Build Up) of two horizontal wells were simulated, the two short radii TFTz329 (400m), and TFTz333 (200m) were drilled in the same azimuth the numerical match yields to the following permeability tensors: well TFTz329 (Kx=2 md, Ky=90 md, and Kz=110 md), and well TFTz333(Kx=5 md, Ky=100 md, and Kz=115 md).

The permeability tensors obtained correspond to a configuration indicating a plan of oriented fractures. The wells have been drilled perpendicular to the fractures. The matrix permeability is K matrix=5 md and the fractures permeability K fissures=100 md . these results were confirmed by the imagery (FMI, UBI) run in both wells. Laboratory tests on cores of vertical wells confirmed these results and gave K fissures=70 md.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado