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Journal of Porous Media
インパクトファクター: 1.49 5年インパクトファクター: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 印刷: 1091-028X
ISSN オンライン: 1934-0508

巻:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019028982
pages 343-361

TRANSIENT PRODUCTION DECLINE BEHAVIOR ANALYSIS FOR A MULTI-FRACTURED HORIZONTAL WELL WITH DISCRETE FRACTURE NETWORKS IN SHALE GAS RESERVOIRS

Mingqiang Wei
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan, China
Yonggang Duan
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan, China
Mingzhe Dong
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, People's Republic of China; Department of Chemical and Petroleum Engineering, Schulich School of Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
Quantang Fang
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, Sichuan, China
Morteza Dejam
Department of Petroleum Engineering, College of Engineering and Applied Science, University of Wyoming, 1000 E. University Avenue, Laramie, Wyoming 82071-2000, USA

要約

Multi-fractured horizontal well (MFHW) is extensively applied to develop the shale gas reservoirs. After massive fracturing, the complex fracture network will exist around the horizontal wellbore. To model the flow behavior more rigorously, the fractures within the network should be represented explicitly rather than idealized as dual-porosity media around the wellbore. Thus, a conceptual model of discrete fracture network for MFHW is first constructed by using the unstructured perpendicular bisection (PEBI) grid. Then, a mathematical model considering the stress sensitivity of the reservoir permeability, Darcy flow, diffusion, and adsorption and desorption in shale gas reservoirs is developed and the numerical nonlinear production decline equations are derived and obtained. Subsequently, the model is verified by a simplified model and production decline curves for a MFHW with discrete fracture networks in shale gas reservoirs are plotted. Five flow regions including early formation linear flow, interference flow among discrete fracture networks, compound pseudo-linear flow, pseudo radial flow, and pseudo-steady-state flow are identified. Finally, the sensitivity studies for the eight related parameters are conducted on the production decline type curves, and the production decline type curves of the MFHW are verified by a field case study. This study can provide very meaningful references for reservoir engineers to stimulate effectiveness and reservoir properties evaluation as well as production performance estimation of MFHW in shale gas reservoirs by matching the type curves with actual field data.


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