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Layer regrouping optimization for multilayer heterogeneous reservoirs at a high water cut stage

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Abstract

Due to the vertical heterogeneity of the multilayer reservoirs, which results in a great interlayer interference, the recovery of each layer is significantly different when all layers are perforated and produced simultaneously. The layer with poor reservoir properties has a smaller recovery than that with good reservoir properties. Layer regrouping is an effective method to reduce interlayer interference and improve the recovery of the layer with poor reservoir properties. However, not all layer regrouping programs are reasonable when considering the relationship of investment and income. We must find the optimal layer regrouping program. In this paper, we generate all possible layer regrouping programs by using the enumeration method with the second kind Stirling numbers. The optimal layer regrouping program is obtained with considering the effect of technique and economic factors. Based on the theory of Buckley-Leveret displacement, the cumulative oil production of each program is obtained. The more oil produced, the more favorable the program is. The feasibility of layer regrouping program is seriously depended on economic benefits, which can be calculated by net present value method. The feasibility of layer regrouping program under different drilling well number and crude oil price is analyzed. Finally, a case for layer regrouping optimization is introduced. From the case, we can conclude that when oil price is $70 per barrel and drilling well number is 2, the 237th program is the optimal layer regrouping program, whose net present value is 422.44 × 104 Chinese yuan.

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Funding

The work is supported by the China National Science and Technology Major Projects (Grant No: 2016ZX05011-002-003 and 2016ZX05010-002-007), China University of Petroleum Graduate Innovation Engineering Project (Grant No: YCX2018013), and the Fundamental Research Funds for the Central Universities (Grant No: 18CX06011A).

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Authors and Affiliations

  1. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, 266580, China

    Wu Zhongwei, Cui Chuanzhi, Li Rongtao, Wei Zijian & Gao Min

  2. School of Mining and Petroleum, Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2R3, Canada

    Wu Zhongwei & Japan Trivedi

  3. Hebei Scoilmic Petroleum Technology Co., Ltd, No.40 Shuiyue Temple Main Street, Chanzhou, 061001, Hebei, People’s Republic of China

    Tang Wenhao

Authors
  1. Wu Zhongwei
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  2. Cui Chuanzhi
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  3. Japan Trivedi
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  4. Li Rongtao
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  5. Tang Wenhao
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  6. Wei Zijian
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  7. Gao Min
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Corresponding author

Correspondence to Cui Chuanzhi.

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Editorial handling: Liang Xiao

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Zhongwei, W., Chuanzhi, C., Trivedi, J. et al. Layer regrouping optimization for multilayer heterogeneous reservoirs at a high water cut stage. Arab J Geosci 12, 458 (2019). https://doi.org/10.1007/s12517-019-4631-6

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  • DOI: https://doi.org/10.1007/s12517-019-4631-6

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