FRACTURED RESERVOIR CHARACTERIZATION USING DECLINE CURVE ANALYSIS TECHNIQUE

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SHAHVERDI H.R.; HAGHIGHI M.; FOLADI K.

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Journal: Year:2007 | Volume:41 | Issue:2 (104) Page(s): 185-192

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Title

FRACTURED RESERVOIR CHARACTERIZATION USING DECLINE CURVE ANALYSIS TECHNIQUE

Author(s)

SHAHVERDI H.R. | HAGHIGHI M. | FOLADI K. | Issue Writer Certificate

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Abstract

The history of the well production rate is a useful source of data not only for the well production potential in the future but also for the reservoir characterization. The reservoir average permeability, reserve, drainage area and well skin factor can be estimated using decline curve analysis technique which is based on the Fetkowich method. The decline curve can be generated by analytical solution of flow equations in porous media. In order to use the Fetkowich method, several assumptions should be made such as constant bottom- hole well pressure, no acidization, no aquifer effect in the reservoir and the reservoir should be homogeneous. Since fluid flow equations in the fractured reservoirs are different than homogeneous reservoir, we need to know if the Fetkowich method can be applied in the fractured reservoirs as well.First, a hypothetical reservoir with real data was constructed having several production wells with constant bottom- hole well pressure and the decline curves were generated for the reservoir. Then, this decline curve was compared with the Fetkowich decline curve. In the present work, it was shown that a good estimation for the fracture permeability could be obtained by using the Fetkowich method. Finally, using a real heterogeneous reservoir data (Cheshmeh Khosh oil field), the reservoir permeability was determined with the Fetkowich method. Cheshmeh Khosh oil field is one of the Iranian carbonate fractured reservoirs in south-west Iran. Although this reservoir does not have the same conditions for using decline curve analysis, using some periods that the production rate is declining, a good estimation for some reservoir properties University College of Engineering, University of Tehran 3 can be made. Therefore, we need to determine the time decline period for each well and the data should be smooth. Since there was a good agreement between the calculated permeability and the permeability from well test data, it was concluded that the Fetkowich method can be applied in the fractured reservoir as well. However, these results are not trustable for skin factor determination.

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APA: Copy

SHAHVERDI, H.R., HAGHIGHI, M., & FOLADI, K.. (2007). FRACTURED RESERVOIR CHARACTERIZATION USING DECLINE CURVE ANALYSIS TECHNIQUE. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 41(2 (104)), 185-192. SID. https://sid.ir/paper/14216/en

Vancouver: Copy

SHAHVERDI H.R., HAGHIGHI M., FOLADI K.. FRACTURED RESERVOIR CHARACTERIZATION USING DECLINE CURVE ANALYSIS TECHNIQUE. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;41(2 (104)):185-192. Available from: https://sid.ir/paper/14216/en

IEEE: Copy

H.R. SHAHVERDI, M. HAGHIGHI, and K. FOLADI, “FRACTURED RESERVOIR CHARACTERIZATION USING DECLINE CURVE ANALYSIS TECHNIQUE,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 41, no. 2 (104), pp. 185–192, 2007, [Online]. Available: https://sid.ir/paper/14216/en

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