石油钻采工艺2012，Vol.34Issue(4)：96-99,4.
热处理提高煤岩渗透率的机理
Mechanism exploration on improving coal rock permeability by heat treating
摘要
Abstract
This paper investigated the relationship between coal rock permeability and heating temperature in less than 200 X. Through laboratory experiments. And by means of X-ray diffraction analysis and Scanning Electron Microscope, the influence of heat on coal rock permeability was analyzed from perspective of coal chemistry and coal geology. The results shows that coal rock permeability could be significantly increased from less than 0.5 mD to 15 mD by heat treating. Analyzing results indicate that mechanisms may be explained as follows: Firstly, dehydration of coal rock and partly volatile components releasing of coal rock will form new pores. Secondly, desorption of methane molecules and dehydration of gelatinous micro-component in the matrix lead to the shrinkage of coal matrix. Thirdly, coal rock generates hydrocarbon gases after oxidizing reaction of carbon and Hydrogen atoms, and the gas releasing forms tiny cracks and reduces the degree of coal rock compaction. Fourth, coal rock encounters inhomogeneous deformation under thermal stress, and produces uneven small cracks. Finally, the paper proposes a new mode of coal bed methane (CBM) exploitation to enhance CBM recovery by injecting thermal CO2. Above researches may be of great help to the exploitation of CBM reservoirs with low permeability in China.关键词
煤岩/热处理/渗透率/微裂隙/机理Key words
coal rock/ heating treatment/ permeability/ micro-cracks, mechanism分类
能源科技引用本文复制引用
刘浩,蔡记华,肖长波,王济君,陈宇..热处理提高煤岩渗透率的机理[J].石油钻采工艺,2012,34(4):96-99,4.基金项目
国家自然科学基金"纳米架桥材料在低孔低渗煤层气藏钻完井过程中的暂堵机理研究"(编号:41072111) （编号:41072111）
"可降解钻井液在松软煤层瓦斯抽采孔钻进中的护孔和储层保护机理研究"(编号:40802031). （编号:40802031）
