A Design and Optimization Method of Performing Layer Combinations in Separate-Layer CO 2 Flooding to Improve Oil Recovery

Zheng Li (), Tiyao Zhou, Hengfei Yin and Yingying Sun
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Zheng Li: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Tiyao Zhou: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Hengfei Yin: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Yingying Sun: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Energies, 2023, vol. 16, issue 19, 1-14

Abstract: Separate-layer CO 2 flooding has increasingly been used to improve the overall development of multi-layer heterogeneous reservoirs. Due to their field technical limitations, layer combinations have to be carried out to reduce the number of layer-groups required for the separate injection of CO 2 . Currently there are few studies of the method of designing layer combinations. In field practice, the layer combinations are often made based on the permeability ratio of the layers to be developed, but it is not possible to accurately obtain the optimal scheme in many cases. Therefore, in this paper, a new design and optimization method based on the weighted standard deviation of permeability is proposed, which comprehensively considers the effects of multiple geological and fluid properties in different layers. The new method is applied to study the layer combination schemes in separate-layer CO 2 flooding in H block, Daqingzijing Oilfield, Jilin, China. The prioritization of all of the schemes is obtained via the method, and a related numerical model is also established to perform verification and quantitative analysis. The results show that designing layer combinations using the new proposed method can achieve better development effect than using the conventional permeability ratio based method. It can achieve a more uniform interlayer CO 2 displacement with an obvious improvement in the CO 2 swept volume in low permeability layers and a higher overall oil recovery. According to the numerical simulation results, using the optimal layer combination scheme designed via the new proposed method, the ten-year swept volume of CO 2 in the low permeability layer can be increased by 16.2%, and the ten-year overall oil recovery efficiency can be increased by 3.3%, with both measures showing a remarkable improvement. The work can provide a significant reference point for the field design of layer combinations in separate-layer CO 2 flooding.

Keywords: CO 2 -EOR; separate-layer gas injection; layer combination optimization; expanding swept volume; interlayer uniform displacement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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