A Well Placement Optimization Constrained to Regional Pressure Balance
| Autor: | Menhal Al-Ismael, H. S. Al-Hashim, Abeeb A. Awotunde, Hasan Y. Al-Yousef |
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| Rok vydání: | 2018 |
| Předmět: |
Well placement
geography Mathematical optimization geography.geographical_feature_category Computer science 010103 numerical & computational mathematics 010502 geochemistry & geophysics 01 natural sciences Reservoir simulation Differential evolution Pressure balance 0101 mathematics 0105 earth and related environmental sciences Water well |
| Zdroj: | Day 3 Wed, June 13, 2018. |
| DOI: | 10.2118/190788-ms |
| Popis: | Reservoir characterstics and profitability are two important constraints in any field development. Net present value (NPV) is usually used to measure the cash flow profitability profile and determine associated financial risks. On the other hand, voidage replacement ratio (VRR) is used to measure the rate of change in reservoir energy. In recent studies, VRR was used as an additional objective in well placement optimization. Such studies proposed minimizing single value of VRR that represents the entire reservoir. However, such single VRR value may not detect unbalanced distribution of reservoir pressure. Severe alteration of voidage replacement distribution could occur in the reservoir that could not be represented accurately by a single value of VRR. Therefore, we propose a more efficient method to overcome disparate regional pressure changes in well placement optimization. This new method is based on optimization of NPV constrained to regional average pressure of the reservoir. Differential evolution algorithm was applied to find the optimum well locations that yield the maximum NPV constrained to regional pressure balance. The regional pressure balance was achieved by specifying a maximum allowable difference between any two regional pressures. We evaluated four scenarios of reservoir development. The first two scenarios involve the use of predefined well patterns. In these scenarios, the well locations were selected without any optimization. The third scenario involves the optimization of well placement without constraining it to any pressure balance. The fourth scenario involves optimization of well placement constrained to regional pressure balance. The results obtained indicate that we can minimize the difference of average pressure between regions while achieving high values of NPV. This helps to have a uniformly distributed reservoir pressure throughout the production life of the reservoir. |
| Databáze: | OpenAIRE |
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