首页|Excess pore pressure behavior and evolution in deep coalbed methane reservoirs
Excess pore pressure behavior and evolution in deep coalbed methane reservoirs
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
万方数据
Deep coalbed methane(DCBM),an unconventional gas reservoir,has undergone significant advance-ments in recent years,sparking a growing interest in assessing pore pressure dynamics within these reservoirs.While some production data analysis techniques have been adapted from conventional oil and gas wells,there remains a gap in the understanding of pore pressure generation and evolution,par-ticularly in wells subjected to large-scale hydraulic fracturing.To address this gap,a novel technique called excess pore pressure analysis(EPPA)has been introduced to the coal seam gas industry for the first time to our knowledge,which employs dual-phase flow principles based on consolidation theory.This technique focuses on the generation and dissipation for excess pore-water pressure(EPWP)and excess pore-gas pressure(EPGP)in stimulated deep coal reservoirs.Equations have been developed respectively and numerical solutions have been provided using the finite element method(FEM).Application of this model to a representative field example reveals that excess pore pressure arises from rapid loading,with overburden weight transferred under undrained condition due to intense hydraulic fracturing,which sig-nificantly redistributes the weight-bearing role from the solid coal structure to the injected fluid and lib-erated gas within artificial pores over a brief timespan.Furthermore,field application indicates that the dissipation of EPWP and EPGP can be actually considered as the process of well production,where methane and water are extracted from deep coalbed methane wells,leading to consolidation for the arti-ficial reservoirs.Moreover,history matching results demonstrate that the excess-pressure model estab-lished in this study provides a better explanation for the declining trends observed in both gas and water production curves,compared to conventional practices in coalbed methane reservoir engineering and petroleum engineering.This research not only enhances the understanding of DCBM reservoir behavior but also offers insights applicable to production analysis in other unconventional resources reliant on hydraulic fracturing.
Deep coalbed methaneConsolidationExcess pore-water pressureExcess pore-gas pressureProduction data analysis
Changqing Liu、Zhaobiao Yang、Yong Qin、Xia Yan、Yunhai Wang、Zhe Wang
展开 >
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry of Education,China University of Mining and Technology,Xuzhou 221008,China
School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China
National Engineering Research Center of Coalbed Methane Development & Utilization,Beijing 100095,China
PetroChina Coalbed Methane Company Limited,Beijing 102200,China
SINOPEC East China Oil and Gas Company,Nanjing 210000,China
展开 >
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Applied Science and Technology Project of PetroChinaMajor Science and Technology Project of Changqing Oilfield
NETL
NSTL
万方数据
