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ISSN 打印: 2151-4798
ISSN 在线: 2151-562X

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DOI: 10.1615/SpecialTopicsRevPorousMedia.v5.i2.50
pages 145-155

TYPE CURVES FOR PRODUCTION ANALYSIS OF NATURALLY FRACTURED SHALE GAS RESERVOIRS WITH STRESS-SENSITIVE EFFECT

Shuang Ai
Sinopec Research Institute of Petroleum Engineering
Linsong Cheng
Department of Petroleum Engineering, China University of Petroleum–Beijing, 102249 Beijing, PR China
Shijun Huang
MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Hongjun Liu
MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Zheng Jia
MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Bailu Teng
MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

ABSTRACT

Shale permeability is generally very low, from 10−6 to 10−3 mD, making it extremely difficult for intra-formational gas to flow on a large scale. To address this problem, horizontal wells and multi-stage fracturing are employed to develop low-permeability shale gas reservoirs. During multi-stage hydraulic fracturing, natural fractures reopen and form pathways for gas to flow, the process of which is called stimulated reservoir volume (SRV). Transient linear flow is identified as the dominant flow regime in SRV, which has been verified by theoretical studies and production performance. As production progresses, the natural fracture permeability stimulated during multi-stage fracturing declines along with the reservoir pressure. Previous research and production flow models have not considered the permeability-decreasing effect of stimulated natural fractures. For this study, a transient linear dual-porosity model was designed to investigate the performance of multi-fractured horizontal shale gas wells relative to the stress-sensitive permeability of natural fractures. Type curves were analyzed using Laplace transformation and numeric inverse transformation. Our results show that significant error occurs if the stress sensitivity of natural fractures is neglected when using traditional type curve analysis for production parameters of fractured horizontal wells in shale reservoirs.


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