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
173pt; mso-spacerun: 'yes'">In recent years, CO2 173pt; mso-spacerun: 'yes'">phase transition jet (CPTJ) coal-breaking technology has been reported to increase coal 173pt; mso-spacerun: 'yes'">seam permeability. However, the structural evolution e173pt; mso-spacerun: 'yes'">ffff173pt; mso-spacerun: 'yes'">ect of coal subjected to CPTJ technology is unclear, 173pt; mso-spacerun: 'yes'">which restricts widespread CPTJ technology application. In this study, a laboratory experimental system and 173pt; mso-spacerun: 'yes'">fifi173pt; mso-spacerun: 'yes'">eld technical equipment were developed, and coal-breaking experiments under di173pt; mso-spacerun: 'yes'">ffff173pt; mso-spacerun: 'yes'">erent CPTJ pressure con173pt; mso-spacerun: 'yes'">ditions were conducted. We investigated pore structure changes by combining scanning electron microscopy 173pt; mso-spacerun: 'yes'">(SEM) and mercury intrusion porosimetry (MIP) to better understand the coal pore structure evolution char173pt; mso-spacerun: 'yes'">acteristics under di173pt; mso-spacerun: 'yes'">ffff173pt; mso-spacerun: 'yes'">erent CPTJ pressures. Furthermore, an enhanced coalbed methane (ECBM) recovery ex173pt; mso-spacerun: 'yes'">periment using CPTJ coal-breaking technology was conducted with the self-developed technical equipment. The 173pt; mso-spacerun: 'yes'">results show that notable damage occurs in the coal body in173pt; mso-spacerun: 'yes'">flfl173pt; mso-spacerun: 'yes'">uenced by CPTJ, and the damage area increases 173pt; mso-spacerun: 'yes'">with increasing jet pressure. The SEM results revealed that more pores and cracks are produced due to liquid CO2 173pt; mso-spacerun: 'yes'">CPTJ, and the porosity and crack size increase with increasing jet pressure. MIP analysis indicates that the pore 173pt; mso-spacerun: 'yes'">structure of the breaking coal samples mainly includes macropores, and coal sample macroporosity increases 173pt; mso-spacerun: 'yes'">signi173pt; mso-spacerun: 'yes'">fifi173pt; mso-spacerun: 'yes'">cantly with increasing jet pressure. The 173pt; mso-spacerun: 'yes'">fifi173pt; mso-spacerun: 'yes'">eld ECBM experiment showed that CPTJ technology can reduce 173pt; mso-spacerun: 'yes'">the coalbed methane (CBM) drainage decay coe173pt; mso-spacerun: 'yes'">ffiffiffi173pt; mso-spacerun: 'yes'">cient and increase the CBM extraction pure 173pt; mso-spacerun: 'yes'">flfl173pt; mso-spacerun: 'yes'">ow rate and 173pt; mso-spacerun: 'yes'">recovery e173pt; mso-spacerun: 'yes'">ffiffiffi173pt; mso-spacerun: 'yes'">ciency 8.3173pt; mso-spacerun: 'yes'">–173pt; mso-spacerun: 'yes'">10.4 and 20.4 times, respectively.