| 二氧化氯对煤储层物性改变的机理研究 |
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| 引用本文： | 郭红玉,拜阳,夏大平,王惠风,陈俊辉,马俊强.二氧化氯对煤储层物性改变的机理研究[J].煤田地质与勘探,2015,43(1):26-29. |
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| 作者姓名： | 郭红玉 拜阳 夏大平 王惠风 陈俊辉 马俊强 |
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| 作者单位： | 1. 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地，河南 焦作 454000; 河南理工大学能源科学与工程学院，河南 焦作 454000; 中原经济区煤层 页岩 气河南省协同创新中心，河南 焦作 454000
2. 河南理工大学能源科学与工程学院,河南 焦作,454000 |
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| 基金项目： | 国家自然科学基金项目(41002047；41472127；41472129)；山西省煤层气联合研究基金项目(2013012004)；河南省科技攻关项目(132102210253)；河南省教育厅科学技术研究重点项目(12A440005；13A440335；14A170005)；河南理工大学博士基金项目 |
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| 摘 要： | 二氧化氯在作为煤储层压裂破胶剂的同时,兼具降低煤的亲甲烷能力和化学增透作用。查明二氧化氯对煤储层物性改变的内在机理,对深部煤储层改造摒弃传统活性水改用高粘压裂液有重要意义。通过对二氧化氯改性前后的不同变质程度煤样的压汞和Raman光谱测试,对比分析了煤样改性前后的孔隙结构和化学结构的变化特征。测试结果表明:煤样改性后孔隙度和孔容不同程度增加,比表面积降低;改性后煤的脂肪链的支链化程度和芳香环的缩合程度均降低,煤结构单元缺陷增加,芳碳总量相对减少。可见,煤储层物性改变的机理在于煤孔隙结构及其大分子结构发生了相应变化。
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| 关 键 词： | 煤层气 二氧化氯 压汞 拉曼光谱 大分子结构 |
| 收稿时间： | 2013-07-17 |
Transformation mechanism of coal reservoir physical properties by chlorine dioxide |
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| GUO Hongyu,BAI Yang,XIA Daping,WANG Huifeng,CHEN Junhui,MA Junqiang.Transformation mechanism of coal reservoir physical properties by chlorine dioxide[J].Coal Geology & Exploration,2015,43(1):26-29. |
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| Authors: | GUO Hongyu BAI Yang XIA Daping WANG Huifeng CHEN Junhui MA Junqiang |
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| Abstract: | Chlorine dioxide (ClO2) is effective on gel-breaking of reservoir fracturing for coalbed methane wells, as well as on weakening the affinity for methane and increasing the permeability of coal reservoir. To investigate the mechanism of ClO2 modifying the physical properties of coal reservoirs is of great significance in the recognition of using high-viscosity fracturing fluid instead of commonly-used active water for deep coal reservoir modification. Coal samples with different metamorphic grades were selected and further examined by Raman spectra and mercury injection, aiming to compare the modification characteristics of porous and chemical structures of coal before and after the treatment of ClO2. The analytical results show that:(1) The porosity and pore volume of coal samples were enhanced to varying degrees, while the specific surface area decreased. (2) The branching degree of aliphatic chains and condensational degree of aromatic rings of the post-modified coals both saw a decrease. Additionally, the defect of structural units increased, while the total amount of aromatic carbon reduced. Thus, the mechanism of ClO2 modifying the physical properties of coal reservoir lie in the corresponding changes of porous and molecular structures of post-treated coals. |
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| Keywords: | coalbed methane chlorine dioxide mercury injection Raman spectrum macro-molucular structure |
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