- 责任者：Guo Hongyu (State Key Laboratory Cultivation Base for Gas Geology and Gas Control ; Henan Polytechnic University ; Jiaozuo 454000 ; China) ; Wang Huifeng
- 刊名：Natural Gas Industry
- 出版年：2013
- 卷期：33(11)
- 关键词：煤储层 ; coal reservoirs
- 页码：p.40-44
- 图表：2 illus., 4 tables, 20 refs.
- 分类号：1003
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
With chlorine dioxide （C102） adopted under low temperatures of coal reservoirs, not only can rapid gel breaking and flowback of high viscosity fracturing fluids be achieved, but a coal＇s affinity can be lowered for methane. However, the impact of the strong oxidation of C102 on pore structure is still not fully understood. Three coal samples with different ranks were collected from different coal mines. After being crushed into grains with a diameter of about 2 mm, the samples were soaked in C102 solutions with a concentration of 4000/,g/g for 72 hours. Then the mercury injection method was used to analyze the coal samples to reveal the vari- ations of porosity, pore size distribution, pore volume and specific surface area before and after being treated with the C102 solution. The following results were obtained, a. The porosity and pore volume of coal samples both get enhanced to varying degrees, and the pore volume ratios of macropores and mesopores increase after treatment, b. The hysteresis on the mercury intrusion and extrusion curves disappears, the joint opening decreases and the pore connectivity is improved, c. The specific surface areas of pores decrease, so does the ratio of specific surface area between micro- and nano-pores. In conclusion, chlorine dioxide can improve pore structure and enhance permeability of coal reservoirs, thus is favorable for migration and recovery of CBM.