Abstract
Recently shale gas plays have dominated the onshore U.S. natural gas drilling activity with this boom occurring during a time of economic uncertainty. However, skepticism has recently been placed on shale gas production decline trends from consultants and investment firms, where assessing reservoir properties and well productivity of shale plays have been brought into an important place. This paper seeks to find a more accurate methodology on assessing reservoir properties and well productivity of dry shale gas in Marcellus. Based on reservoir properties, an assumption is presented that shale’s thickness and pleasant point’s thickness may be key factors which effect well productivity. A data-enable method which collects hundreds of thousands well’s production data is presented in this article. By dividing Susquehanna into six regions and dividing all wells into three types well group, it was founded that well productivity is mainly affected by shale’s thickness rather than the thickness of point pleasant. Finally, production decline curve has been divided into two periods: rapid decline period with conquered by linear flow in fracture network, and persistent producing period with affected by controlling radius and half-length of fracture. The effects of major parameters on production decline curves are analyzed by using the proposed model and it was found that different parameters have their own influence period and sensitivity intensity. The results of this methodology help engineer easily find which area could be productive in Susquehanna shale plays, or if a better methodology may exist.
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Acknowledgements
This article is supported by National Science and Technology Major Project, China (Grant NO. 2016ZX05061) and the Study on Formation Characteristics and Stable Production Technology of Shale Gas and Oil (Grant NO. KL19037) which are gratefully acknowledged.
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Lu, T. et al. (2022). A Data-Enable Method for Marcellus Shale Gas Production Data Analysis. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2021. IFEDC 2021. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-19-2149-0_448
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