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
- 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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内容简介
tyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">In recent years, COtyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 5.08pt; mso-spacerun: 'yes'">2 tyle="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 tyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">seam permeability. However, the structural evolution etyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fffftyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ect of coal subjected to CPTJ technology is unclear, tyle="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 tyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifityle="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 dityle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fffftyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">erent CPTJ pressure contyle="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 tyle="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 chartyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">acteristics under dityle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fffftyle="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 extyle="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 tyle="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 intyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">flfltyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">uenced by CPTJ, and the damage area increases tyle="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 COtyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 5.08pt; mso-spacerun: 'yes'">2 tyle="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 tyle="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 tyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">signityle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifityle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">cantly with increasing jet pressure. The tyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">fifityle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">eld ECBM experiment showed that CPTJ technology can reduce tyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">the coalbed methane (CBM) drainage decay coetyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffiffiffityle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">cient and increase the CBM extraction pure tyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">flfltyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ow rate and tyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">recovery etyle="FONT-FAMILY: AdvOT596495f2+fb; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ffiffiffityle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">ciency 8.3tyle="FONT-FAMILY: AdvOT596495f2+20; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">–tyle="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">10.4 and 20.4 times, respectively.
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