Authors: V.A. Khyamyalyaynen, M.A. Baev
Title of the article: Hydrodynamic calculation of the process of propping of hydraulic fractures
Year: 2019, Issue: 4, Pages: 90-98
Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)s
Index UDK: 622.324.5
DOI: 10.26730/1999-4125-2019-4-90-98
Abstract: The article is devoted to the issues of hydraulic coal seam fracturing technology. General information about the development of this technology and the used propping agents is given. The expediency of using local naturally occurring sands for propping fractures, when extracting methane from coal seams, is noted. The most suitable model of the proppant-laden slurry flow in hydraulic fracture is proved. The critical (minimum non-settling) velocity of the slurry flow in fracture is taken as one of the parameters of the process of propping fractures. The method of determining the critical velocity based on concepts of the theory of similarity and the dimensional analysis is considered in detail. Another important parameter affecting hydraulic fracture propping is the filtration of the liquid phase of slurry into the permeable coal seam. The phenomenon of fracturing fluid filtration leads to a decrease in the rate of slurry flow in fracture that increases the intensity of proppant settling. It may cause the impossibility of further full high-quality propping (filling with proppant) of hydraulic fracture. Therefore, the model of the slurry flow in horizontal and vertical fracture is developed to estimate the fracturing fluid flow rate. As a result, expressions for determining the intensity of the fracturing fluid filtration into the permeable coal seam are obtained. The results allow determining reasonably the slurry feed rate and the proppant concentration in its composition.
Key words: coalbed methane hydraulic fracturing proppant sand permeability static settling velocity critical velocity filtration
Receiving date: 02.04.2019
Approval date: 01.01.1970
Publication date: 19.12.2019
This work is licensed under a Creative Commons Attribution 4.0 License.
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