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Flow field characters near fracture entrance in supercritical carbon dioxide sand fracturing

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doi: 10.1002/ghg.1915
Authors:Song Weiqiang; Zhang Junming; Wang Chunguang; Chen Shaojie; Chen Zhongwei
Author Affiliations:Primary:
Shandong University of Science and Technology, State Key Laboratory of Mining Disaster Prevention and Control, Qingdao, China
Volume Title:Greenhouse Gases
Source:Greenhouse Gases, 9(5), p.999-1009. Publisher: John Wiley & Sons, Sussex, United Kingdom. ISSN: 2152-3878
Publication Date:2019
Note:In English. 31 refs.; illus., incl. 1 table
Summary:To investigate the flow field near fracture entrance and promote the development of sand fracturing with carbon dioxide as the working fluid, numerical simulation of multiphase flow was conducted with a 3D geological model considering the compressibility of carbon dioxide. The flow field of carbon dioxide alone was firstly investigated to lay the foundation for the analysis of multiphase flow, and then comparative analysis was conducted on the flow field of both the injecting sand from the pipe and the annulus. The results show that jet fracture with carbon dioxide can achieve a 4.46 MPa pressure boost at the fracture tip compared to the annulus pressure, which theoretically validates the feasibility of the mentioned technology. Sand fracturing can achieve a higher pressure boost in the cavity, while it needs greater pump pressure at the surface. Injecting sand from the annulus could decrease the need for pump pressure by 6.62 MPa at the condition of injecting 25% carbon dioxide from the annulus simultaneously, while the pressure difference between the cavity tip and the annulus decreases as a result. Copyright 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.
Subjects:Boundary conditions; Carbon dioxide; Equations; Fluid dynamics; Fluid flow; Fluid injection; Greenhouse gases; Hydraulic fracturing; Liquid phase; Mathematical models; Multiphase flow; Numerical models; Pollution; Pumping; Reynolds number; Simulation; Slurries; Three-dimensional models; Turbulence; Underground disposal; Viscosity; Wellhead protection
Record ID:869791-12
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom
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