Impact of borehole design on methane recovery efficiency in hydraulic fracturing

Coal seam gas drainage is an important tool to ensure labor safety of miners. The growing depth of coal mining reduces efficiency of this tool because of lower permeability of cracks in deeper level coal, which leads to weakened gas emission. It is possible to enhance gas recovery by way of various treatment of coal seams in order to stimulate the coal–borehole interface, to change the permeability of rocks using natural jointing and to create new systems of joints. As a gas drainage method, proppant-free hydraulic fracturing was tested in boreholes drilled in temporary roadways in Kirov Mine of SUEK-Kuzbass [1]. Completion of boreholes in coal seams is the same as in conventional gas reservoirs but needs an adjustment in view of the unique properties of coal. Some coal properties and problems connected with coal seam methane production are: crushability of coal; sensibility of joint systems to cementing or grouting, which results in formation of unwanted coal slack during injection and production; frequently increased pressure in jointed coal. One of the major point in risk assessment in hydrodynamic treatment is justification of borehole design (delineation of sealing zone and open face). At the present time, one of the main parameters of a borehole is the sealing length of 35 m, while hydraulic treatment is carried out in the uncased borehole interval 2 to 7 m long [2]. This study aimed to justify the borehole design based on the comparison of hydrodynamic models of coal seam areas with and without treatment. It was necessary to adapt gas recovery volumes from the reference model and the model with hydraulic fracturing, and to compare the gas recovery volumes in different injection schemes. The modeling used software TNavigator.

Keywords: hydraulic fracturing (HF), coal seam methane (CSM), well log survey (WLS), pressure, modeling, gas drainage, parameters, design, efficiency.
For citation:

Kolikov K. S., Phan Tuan Anh, Khusainov R. A., Matniazova G. I. Impact of borehole design on methane recovery efficiency in hydraulic fracturing. MIAB. Mining Inf. Anal. Bull. 2022;(12):152-165. [In Russ]. DOI: 10.25018/0236_1493_2022_12_0_152.

Acknowledgements:
Issue number: 12
Year: 2022
Page number: 152-165
ISBN: 0236-1493
UDK: 622.817.47
DOI: 10.25018/0236_1493_2022_12_0_152
Article receipt date: 01.07.2022
Date of review receipt: 15.09.2022
Date of the editorial board′s decision on the article′s publishing: 10.11.2022
About authors:

K.S. Kolikov1, Dr. Sci. (Eng.), Assistant Professor, Head of Chair, е-mail: kolikovks@mail.ru,
Phan Tuan Anh1, Graduate Student, е-mail: tuananhr1369@gmail.com,
R.A. Khusainov2, Graduate Student, е-mail: khusainov.p@gmail.com,
G.I. Matniazova3, Graduate Student, е-mail: gala.13@bk.ru,
1 National University of Science and Technology «MISiS», 119049, Moscow, Russia,
2 Gubkin Russian State University of Oil and Gas (National Research University), 119991, Moscow, Russia.

 

For contacts:

K.S. Kolikov, e-mail: kolikovks@mail.ru.

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