首页|A semi-analytical model for coupled flow in stress-sensitive multi-scale shale reservoirs with fractal characteristics

A semi-analytical model for coupled flow in stress-sensitive multi-scale shale reservoirs with fractal characteristics

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A large number of nanopores and complex fracture structures in shale reservoirs results in multi-scale flow of oil.With the development of shale oil reservoirs,the permeability of multi-scale media un-dergoes changes due to stress sensitivity,which plays a crucial role in controlling pressure propagation and oil flow.This paper proposes a multi-scale coupled flow mathematical model of matrix nanopores,induced fractures,and hydraulic fractures.In this model,the micro-scale effects of shale oil flow in fractal nanopores,fractal induced fracture network,and stress sensitivity of multi-scale media are considered.We solved the model iteratively using Pedrosa transform,semi-analytic Segmented Bessel function,Laplace transform.The results of this model exhibit good agreement with the numerical solution and field production data,confirming the high accuracy of the model.As well,the influence of stress sensitivity on permeability,pressure and production is analyzed.It is shown that the permeability and production decrease significantly when induced fractures are weakly supported.Closed induced frac-tures can inhibit interporosity flow in the stimulated reservoir volume(SRV).It has been shown in sensitivity analysis that hydraulic fractures are beneficial to early production,and induced fractures in SRV are beneficial to middle production.The model can characterize multi-scale flow characteristics of shale oil,providing theoretical guidance for rapid productivity evaluation.

Multi-scale coupled flowStress sensitivityShale oilMicro-scale effectFractal theory

Qian Zhang、Wen-Dong Wang、Yu-Liang Su、Wei Chen、Zheng-Dong Lei、Lei Li、Yong-Mao Hao

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Key Laboratory of Unconventional Oil & Gas Development(China University of Petroleum(East China)),Ministry of Education,Qingdao,266580,Shandong,China

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

Shale Oil Development Branch,Chongqing Oilfield Company,PetroChina,Qingyang,745708,Gansu,China

PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China

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国家自然科学基金国家自然科学基金国家自然科学基金

U22B20755227405651974356

2024

10.1016/j.petsci.2023.10.003

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(1)
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