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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  <DIV>dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">In recent years, COdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 5.08pt; mso-spacerun: 'yes'">2 dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">phase transition jet (CPTJ) coal-breaking technology has been reported to increase coal dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">seam permeability. However, the structural evolution edvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffffdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ect of coal subjected to CPTJ technology is unclear, dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">which restricts widespread CPTJ technology application. In this study, a laboratory experimental system and dvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifidvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">eld technical equipment were developed, and coal-breaking experiments under didvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffffdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">erent CPTJ pressure condvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ditions were conducted. We investigated pore structure changes by combining scanning electron microscopy dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">(SEM) and mercury intrusion porosimetry (MIP) to better understand the coal pore structure evolution chardvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">acteristics under didvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffffdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">erent CPTJ pressures. Furthermore, an enhanced coalbed methane (ECBM) recovery exdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">periment using CPTJ coal-breaking technology was conducted with the self-developed technical equipment. The dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">results show that notable damage occurs in the coal body indvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">flfldvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">uenced by CPTJ, and the damage area increases dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">with increasing jet pressure. The SEM results revealed that more pores and cracks are produced due to liquid COdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 5.08pt; mso-spacerun: 'yes'">2 dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">CPTJ, and the porosity and crack size increase with increasing jet pressure. MIP analysis indicates that the pore dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">structure of the breaking coal samples mainly includes macropores, and coal sample macroporosity increases dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">signidvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifidvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">cantly with increasing jet pressure. The dvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifidvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">eld ECBM experiment showed that CPTJ technology can reduce dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">the coalbed methane (CBM) drainage decay coedvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffiffiffidvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">cient and increase the CBM extraction pure dvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">flfldvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ow rate and dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">recovery edvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffiffiffidvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ciency 8.3dvOT596495f2+20; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">–dvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">10.4 and 20.4 times, respectively.

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