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      Gas production from a silty hydrate reservoir in the South China Sea using hydraulic fracturing: A numerical simulation

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          Abstract

          The low permeability of silty hydrate reservoirs in the South China Sea is a critical issue that threatens safe, efficient, and long‐term gas production from these reservoirs. Hydraulic fracturing is a potentially promising stimulation technology for such low‐permeability reservoirs. Here, we assess the gas production potential of a depressurization horizontal well that is assisted by the hydraulic fracturing using numerical simulation according to field data at site SH2 in this area. In addition, the number of horizontal wells drilled is discussed if commercial production is to be performed at this site. The results show that the production potential can be significantly stimulated at the early production stage by adopting hydraulic fracturing in this reservoir due to a better depressurization effect. However, the increase in gas recovery gradually decreases with the continuous dissociation of gas hydrates, and the evolution trend is similar to that in a reservoir without stimulation during later periods of gas production because the dissociation front gradually moves away from the fractures. From the perspective of production potential, using a horizontal well scheme assisted by the hydraulic fracturing technology for gas recovery from a hydrate deposit can sharply reduce the number of operation wells, shorten the drilling operation time, and boost the economic efficiency. The horizontal well scheme may be an effective way to increase the gas yield if the application of quickly deployed horizontal wells and hydraulic fracturing techniques in such hydrate reservoirs greatly increases in the near future.

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          Most cited references80

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          A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils1

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            Clathrate Hydrates of Natural Gases

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              Review of natural gas hydrates as an energy resource: Prospects and challenges

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                Author and article information

                Contributors
                Journal
                Energy Science & Engineering
                Energy Science & Engineering
                Wiley
                2050-0505
                2050-0505
                August 2019
                May 16 2019
                August 2019
                : 7
                : 4
                : 1106-1122
                Affiliations
                [1 ] National Center for International Research on Deep Earth Drilling and Resource Development Faculty of Engineering China University of Geosciences Wuhan China
                [2 ] Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University) Ministry of Education Changsha China
                [3 ] Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Qingdao China
                [4 ] Qingdao Institute of Marine Geology Ministry of Land and Resources Qingdao China
                Article
                10.1002/ese3.353
                644fac64-8be5-4008-a2e3-1901b16b0681
                © 2019

                http://creativecommons.org/licenses/by/4.0/

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