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Experimental Evaluation of Permeability Damage to No.15 Coal Seam in the Qinshui Basin
Author(s) -
FENG Qihui,
KANG Yili,
HUANG Fansheng
Publication year - 2015
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.12306_10
Subject(s) - structural basin , permeability (electromagnetism) , coal , coal mining , geology , petroleum engineering , mining engineering , environmental science , geochemistry , engineering , chemistry , waste management , geomorphology , biochemistry , membrane
Effective evaluation of coal bed methane (CBM) reservoir damage is the precondition of efficient development of CBM program. The coal rock differs from a conventional oil and gas reservoir rock in genesis, chemical composition, physical properties, pore structure and crack morphology (Li et al., 2002; Zou, 2011). Moreover, there is a big difference between CBM and conventional gas in terms of output mechanism and occurrence state. Therefore, it is necessary to distinguish evaluation of permeability damage to coal reservoir from conventional oil and gas reservoirs. In this paper, permeability damage experiment was conducted with coal samples from No.15 Coal Seam in Qinshui basin. Pore structure and surface characteristics before and after the effect of fracturing fluids on coal were also compared and analyzed by Fourier transform infrared emission spectroscopy (FTIRES) and scanning electron microscopy (SEM) respectively. As a result, we reveals the mechanism of fracturing fluid on permeability of CBM reservoirs from micro perspective. Permeability is often used to characterize flow capability of CBM (Chen et al., 2006; Lucas, et al., 2011). Permeability test includes steady state method and unsteady method. Steady state method is commonly used for conventional oil and gas reservoir permeability test. However, we often use unsteady method instead of steady state method for unconventional oil and gas (including tight gas, coal bed methane and shale gas) reservoir permeability, owing to smaller pore size. In this paper, pressure pulse method (one of unsteady method) was used for permeability damage evaluation, which has advantages of repeatability, time saving, high test efficiency and can FENG Qihui, KANG Yili and HUANG Fansheng, 2015. Experimental Evaluation of Permeability Damage to No.15 Coal Seam in the Qinshui Basin . Acta Geologica Sinica (English Edition), 89(supp.): 383-385.