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An enhanced coalbed methane recovery technique based on CO2 phase
详细信息 来源:Fuel 发布日期:2021年1月29日
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标题:An enhanced coalbed methane recovery technique based on CO2 phase
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关键词:Low-permeability coal seam,CO2 phase transition jet,Coal rock breaking,Enhanced coalbed methane recovery
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作者:Xin Bai,Dongming Zhang,Sheng Zeng,Shuwen Zhang,Dengke Wang,Fulin Wang
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内容简介
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AN style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">In recent years, COpt; mso-spacerun: 'yes'">2 pt; mso-spacerun: 'yes'">phase transition jet (CPTJ) coal-breaking technology has been reported to increase coal pt; mso-spacerun: 'yes'">seam permeability. However, the structural evolution ept; mso-spacerun: 'yes'">ffffpt; mso-spacerun: 'yes'">ect of coal subjected to CPTJ technology is unclear, pt; mso-spacerun: 'yes'">which restricts widespread CPTJ technology application. In this study, a laboratory experimental system and pt; mso-spacerun: 'yes'">fifipt; mso-spacerun: 'yes'">eld technical equipment were developed, and coal-breaking experiments under dipt; mso-spacerun: 'yes'">ffffpt; mso-spacerun: 'yes'">erent CPTJ pressure conpt; mso-spacerun: 'yes'">ditions were conducted. We investigated pore structure changes by combining scanning electron microscopy pt; mso-spacerun: 'yes'">(SEM) and mercury intrusion porosimetry (MIP) to better understand the coal pore structure evolution charpt; mso-spacerun: 'yes'">acteristics under dipt; mso-spacerun: 'yes'">ffffpt; mso-spacerun: 'yes'">erent CPTJ pressures. Furthermore, an enhanced coalbed methane (ECBM) recovery expt; mso-spacerun: 'yes'">periment using CPTJ coal-breaking technology was conducted with the self-developed technical equipment. The pt; mso-spacerun: 'yes'">results show that notable damage occurs in the coal body inpt; mso-spacerun: 'yes'">flflpt; mso-spacerun: 'yes'">uenced by CPTJ, and the damage area increases pt; mso-spacerun: 'yes'">with increasing jet pressure. The SEM results revealed that more pores and cracks are produced due to liquid COpt; mso-spacerun: 'yes'">2 pt; mso-spacerun: 'yes'">CPTJ, and the porosity and crack size increase with increasing jet pressure. MIP analysis indicates that the pore pt; mso-spacerun: 'yes'">structure of the breaking coal samples mainly includes macropores, and coal sample macroporosity increases pt; mso-spacerun: 'yes'">signipt; mso-spacerun: 'yes'">fifipt; mso-spacerun: 'yes'">cantly with increasing jet pressure. The pt; mso-spacerun: 'yes'">fifipt; mso-spacerun: 'yes'">eld ECBM experiment showed that CPTJ technology can reduce pt; mso-spacerun: 'yes'">the coalbed methane (CBM) drainage decay coept; mso-spacerun: 'yes'">ffiffiffipt; mso-spacerun: 'yes'">cient and increase the CBM extraction pure pt; mso-spacerun: 'yes'">flflpt; mso-spacerun: 'yes'">ow rate and pt; mso-spacerun: 'yes'">recovery ept; mso-spacerun: 'yes'">ffiffiffipt; mso-spacerun: 'yes'">ciency 8.3pt; mso-spacerun: 'yes'">–pt; mso-spacerun: 'yes'">10.4 and 20.4 times, respectively.
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