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
- 标题：An enhanced coalbed methane recovery technique based on CO2 phase
- 关键词：Low-permeability coal seam,CO2 phase transition jet,Coal rock breaking,Enhanced coalbed methane recovery
- 作者：Xin Bai,Dongming Zhang,Sheng Zeng,Shuwen Zhang,Dengke Wang,Fulin Wang
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style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">In recent years, COstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 5.08pt; mso-spacerun: 'yes'">2 style="FONT-FAMILY: AdvOT596495f2; 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 style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">seam permeability. However, the structural evolution estyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffffstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ect of coal subjected to CPTJ technology is unclear, style="FONT-FAMILY: AdvOT596495f2; 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 style="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifistyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">eld technical equipment were developed, and coal-breaking experiments under distyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffffstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">erent CPTJ pressure constyle="FONT-FAMILY: AdvOT596495f2; 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 style="FONT-FAMILY: AdvOT596495f2; 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 charstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">acteristics under distyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffffstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">erent CPTJ pressures. Furthermore, an enhanced coalbed methane (ECBM) recovery exstyle="FONT-FAMILY: AdvOT596495f2; 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 style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">results show that notable damage occurs in the coal body instyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">flflstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">uenced by CPTJ, and the damage area increases style="FONT-FAMILY: AdvOT596495f2; 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 COstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 5.08pt; mso-spacerun: 'yes'">2 style="FONT-FAMILY: AdvOT596495f2; 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 style="FONT-FAMILY: AdvOT596495f2; 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 style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">signistyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifistyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">cantly with increasing jet pressure. The style="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifistyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">eld ECBM experiment showed that CPTJ technology can reduce style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">the coalbed methane (CBM) drainage decay coestyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffiffiffistyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">cient and increase the CBM extraction pure style="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">flflstyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ow rate and style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">recovery estyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffiffiffistyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ciency 8.3style="FONT-FAMILY: AdvOT596495f2+20; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">–style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">10.4 and 20.4 times, respectively.