| Autor: |
I. Baca Espinoza, Salem Al-Jaberi, A. A. Jalalh, Mohamed Mostafa Amer, Christophe Bassem Maalouf, S. S. Smith, F. Elarouci |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Day 3 Wed, November 09, 2016. |
| Popis: |
Heterogeneous carbonates formations have unique challenge to obtain representative permeability values. During the exploration phase and due to the limited number of wells and technologies, the initial formation evaluation might be misleading. The permeability results from conventional core analysis (CCA) might be significantly under evaluated because vertical interference tests from a wireline formation tester and production tests show different results. This paper describes a case study in offshore Abu Dhabi and solutions that should be assessed to overcome this challenge. An integrated approach was performed to determine the possible causes of permeability mismatch between cores, logs, wireline formation testers and production tests in this field. Based on logs and core data, the reservoir was subdivided into different layers and further refined using permeability indices from NMR logs. Formation testers with advance measurements were used to evaluate effective vertical and horizontal permeability of a single layer. The production testing covering several layers was used to fine-tune subzone permeability and subsequent flow units. The results from this study show that permeability given by CCA was somewhat misleading due to physical limitations from core plugging. The detailed core description and well-test data indicate that a significant portion of flow passes through high-permeability (vuggy) sections of the formation that cannot be measured by plugs. A formation tester was applied to check vertical and horizontal permeability in one productive zone. Various methods were integrated in the study to reconcile the unexpected high productivity of the sub-layer and explain permeability distribution from different tools. This case study provides a useful example in identifying and explaining data from reservoirs where the dynamic well productivity data differs from static data prediction. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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