Experimental study of cryogenic treatment of Karaganda coal samples

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外文摘要：Karaganda Coal Basin bears the largest undeveloped reserve of coalbed methane(CBM)in Kazakhstan,which lacks water resources for implementing large-volume hydraulic fracturing.Cryogenic fracturing utilizing liquid nitrogen(LN2)has been trialled in fields and is a waterless fracturing technique under intensive research these days.This study aimed to evaluate the cryogenic treatment efficacy of Karaganda coal samples as well as to understand the coal permeability evolution during the thawing period.X-ray fluorescent spectrometry(XRF)and microscope imaging identified the compositional and structural heterogeneities of coal specimens mined from different interlayers.Acoustic emission test,permeability measurement,and microscope imaging comparatively characterized the dry coal structure alteration before and after immersion into LN2.Cryogenic treatment slowed down the S-wave velocity through coal specimens,enhanced permeability by over 65％after temperature recovery as well as created new fractures,enlarged existing ones,and spalled coal particles.Dynamic permeability evolution against temperature rise during the thawing process has been successfully captured for the first time.Overall,the experimental measurements support that the LN2 cryogenic fracturing technique would be effective in stimulating coalbeds for CBM production in Karaganda Coal Basin.

外文关键词：

Cryogenic treatmentKaraganda coalDynamic permeabilityAcoustic emissionMicroscopic imageXRF composition

作者：

Lei Wang、Nurzhan Yessenbayev、Xinchuang Yan、Iliyas Sarmalayev、Minsu Cha、Dichuan Zhang、Randy D.Hazlett

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作者单位：

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,College of Energy,Chengdu University of Technology,610059,China

Engineering Research Center of Development and Management for Low to Ultra-Low Permeability Oil & Gas Reservoirs in West China,Ministry of Education,Xi'an Shiyou University,Xi'an 710065,China

Petroleum Engineering Department,Nazarbayev University,010000,Kazakhstan

Department of Civil Engineering,Jeju National University,62343,South Korea

Department of Civil and Environmental Engineering,Nazarbayev University,010000,Kazakhstan

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出版年：

2024

DOI：

10.1016/j.ptlrs.2024.01.009

石油研究(英文)

ISSN：

年,卷(期)：2024.9(3)