DETERMINATION OF PLUG PARAMETERS FOR ROCK ROOF HYDRAULIC FRACTURING IN THE COAL SEAM

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Parent Category: Geo-Technical Mechanics, 2014

Category: Geo-Technical Mechanics, 2014, Issue 118

UDC 622.834.2

Authors:

Vasiliev L.M., D.Sc., Professor (IGTM NAS of Ukraine)

Demchenko V.S., Ph.D. (Tech.) (IGTM NAS of Ukraine)

Demchenko S.V., M. S. (Tech.) (IGTM NAS of Ukraine)

Maltseva V.Ye., M. S. (Tech.) (IGTM NAS of Ukraine)

Ukolova T.M., M. S. (Tech.) (IGTM NAS of Ukraine)

Chygunkov I.F., M. S. (Tech.) (PJSC «Krasnodoncoal»)

Abstract.

Design of a sealing plug proposed by the authors and its advantages in comparison with existing ones are considered in the article. A value of flexible plug compression is determined at which a borehole is securely sealed. A rate of flexible plug compression needed for proper sealing of the borehole is specified. Dependence is set between hydraulic fracturing pressure in the rock roof and depth of the roof occurrence.

Diameter of the sealing plug was calculated by the Poisson’s ratio. An example is given of how to calculate fluid pressure needed for the rocks hydraulic fracturing, and fluid pressure needed for resisting against rock pressure. Results of the calculations are summarized in the table.

Analysis of the immediate roof in the coal seams of Donets Basin shows that the roof consists of various siltstones and sandstones. It is concluded that for the roof rocks hydraulic fracturing at great depths (1000 m or more) it is necessary to use a pump station with head pressure up to 45 MPa.

Keywords:

 borehole, sealing plug, effort, pressure, hydraulic fracturing, roof.

References:

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About the authors:

Vasilyev Leonid Mikhajlovich, Doctor of Technical Science (Ph.D), Professor, Head of Department of Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Demchenko Vyacheslav Sergeevich, Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in Department of Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Demchenko Sergey Vyacheslavjvich, Master of Science, Junior Researcher in Department of Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Maltseva Vera Yevgenevna, Master of Science, Lead Engineer in Department of Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Ukolova Tatyana Michaylovna, Master of Science, Lead Engineer in Department of Rock Breaking Problems, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Sciences of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Chugunkov Igor Fedorovich, Engineer, Director of Public Joint Stock Company «Krasnodoncoal» (PJSC «Krasnodoncoal»), This email address is being protected from spambots. You need JavaScript enabled to view it. .

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