Challenges in well test analysis in naturally fractured carbonate reservoirs case histories. | [Proceedings SPE-PAPG Annual Technical Conference • 2008]

Author(s):

1. M. Saeed Khan Jadoon: Oil and Gas Development Company Limited, Islamabad, Pakistan

2. Shoukat E. Qazi: Oil and Gas Development Company Limited, Islamabad, Pakistan

3. Mian Muhammad Akram: Oil and Gas Development Company Limited, Islamabad, Pakistan

4. Mirza Rizwan Saud: Oil and Gas Development Company Limited, Islamabad, Pakistan

5. S. Khawar Hussain: Oil and Gas Development Company Limited, Islamabad, Pakistan

6. Adnan Akhtar Cheema: Oil and Gas Development Company Limited, Islamabad, Pakistan

Abstract:

Naturally fractured carbonate reservoirs represent a significant area in exploration and effective contribution in production of oil and gas in Pakistan. These carbonate reservoirs pose different challenges in drilling, production and reservoir Management. Well test analysis is always considered a key element in describing the reservoir properties and that has lead to better reservoir management. Historically these analyses are being used for reservoir characterization that dictates appraisal and development strategy of the field. In fractured carbonate reservoir, well test data acquisition and its analysis is very critical in defining reservoir properties. In this work well test analysis of various carbonate reservoirs were conducted and it was found that reservoir properties like permeability, dual porosity and skin derived from well test analyses do not reflect the fracture behavior. During this work, image data (FMI, UBI) were used for fracture characterization and understanding their application in validating well test analysis. It was also found that due to lack of adequate knowledge of the field, erroneous conclusions are usually drawn regarding the reservoir description. In this paper, case history of several well test analyses in fractured carbonate reservoirs are discussed and evaluated with the understanding of fracture properties. Effect of fracture and matrix on the well test analysis, problems relating to acquisition of data and its evaluation have also been fully explained in the paper.

Page(s): 251-273

DOI: DOI not available

Published: Journal: Proceedings SPE-PAPG Annual Technical Conference, Volume: 0, Issue: , Year: 2008

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