气候变化领域集成服务门户(CCPortal): Investigation of permeability change in ultradeep coal seams using time-lapse pressure transient analysis: A pilot project in the Cooper Basin, Australia

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DOI	10.1306/05111817277
	Investigation of permeability change in ultradeep coal seams using time-lapse pressure transient analysis: A pilot project in the Cooper Basin, Australia
	Salmachi A.; Dunlop E.; Rajabi M.; Yarmohammadtooski Z.; Begg S.
发表日期	2019
ISSN	0149-1423
卷号	103 期号:1
英文摘要	Very limited literature is available relating to gas production from ultradeep (>9000 ft [>2700 m]) coal seams. This paper investigates permeability enhancement in ultradeep coal seams of the late Carboniferous and early Permian to Late Triassic Cooper Basin in central Australia, using a time-lapse pressure transient analysis (PTA) approach for a pilot well. The gas production history and three extended shut-in periods are used to construct the time-lapse PTA for the study well. A new approach is introduced to construct a permeability ratio function. This function allows the calculation of permeability change resulting from competition between the compaction and coal-matrix shrinkage effects. Pressure transient analysis indicates that gas flow is dominated by a bilinear flow regime in all extended pressure buildup tests. Hence, reservoir depletion is restricted to the stimulated area near the hydraulic fracture. This implies that well-completion practices that create a large contact area with reservoirs, such as multistage hydraulically fractured horizontal wells, may be required for achieving economic success in these extremely low-permeability reservoirs. The permeability ratio is constructed using the slope of the straight lines in bilinear flow analysis. Because of uncertainty in average reservoir pressure, probabilistic analysis is used and aMonte Carlo simulation is performed to generate a set of possible permeability ratio values. The permeability ratio values indicatethat coal permeability has increased during the production life of the wellbore because of the coal-matrix shrinkage effect. Permeability enhancement in this ultradeep coal reservoir has offset the effect of permeability reduction caused by compaction, which is beneficial to gas production. © 2019. The American Association of Petroleum Geologists.
语种	英语
scopus关键词	Coal; Coal deposits; Compaction; Flow of gases; Horizontal wells; Low permeability reservoirs; Mechanical permeability; Shrinkage; Transient analysis; Uncertainty analysis; Well completion; Average-reservoir pressures; Coal matrix shrinkage; Cooper Basin , Australia; Fractured horizontal wells; Permeability enhancement; Permeability reduction; Pressure transient analysis; Probabilistic analysis; Petroleum reservoir engineering; Carboniferous; coal seam; gas flow; gas production; hydrocarbon reservoir; permeability; Permian; Triassic; Australia; Cooper Basin
来源期刊	AAPG Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/125092
作者单位	Australian School of Petroleum, University of Adelaide, Adelaide, SA, Australia
推荐引用方式 GB/T 7714	Salmachi A.,Dunlop E.,Rajabi M.,et al. Investigation of permeability change in ultradeep coal seams using time-lapse pressure transient analysis: A pilot project in the Cooper Basin, Australia[J],2019,103(1).
APA	Salmachi A.,Dunlop E.,Rajabi M.,Yarmohammadtooski Z.,&Begg S..(2019).Investigation of permeability change in ultradeep coal seams using time-lapse pressure transient analysis: A pilot project in the Cooper Basin, Australia.AAPG Bulletin,103(1).
MLA	Salmachi A.,et al."Investigation of permeability change in ultradeep coal seams using time-lapse pressure transient analysis: A pilot project in the Cooper Basin, Australia".AAPG Bulletin 103.1(2019).