火烧煤层提高强水敏储层煤层气采收率初探
Exploration on Enhancing Extraction of CBM in Water-sensitive Reservoir by Combustion of Coal Seams
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摘要: 常规开采煤层气的方法是排水降压开采，即通过排采地层水降低压力促使煤层气解吸。而针对水敏性储层，在常规开采方式采出效率较低的情况下，提出采用火烧煤层的方式进行煤层气增产，并分别从温度、压力、表面积、竞争吸附等方面阐述其在理论上的可行性，温度提高分子活性，压力提供扩散动力，表面积提供扩散路径，竞争吸附促进解吸等，并通过强水敏储层实例验证，在储层经过火烧煤层改造后，煤层气的采收率有了较大的提高。Abstract: The conventional way to exploit coalbed methane is pressure lowering through drainage, which means that reducing pressure through water drainage for coalbed methane desorption. While, for water-sensitive reservoir, the recovery by conventional way is low; in order to exploit water-sensitive reservoir, combustion of coal seam is proposed to increase recovery ratio, and then theoretical feasibility is elaborated through four aspects: improving activity of molecules by temperature, diffusion by pressure, migration path by superficial area, promoting adsorption and desorption by competition; then given an example of water-sensitive reservoir, the obtained results show that the recovery is effectively improved through combustion of coal seam.
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[1] 赵庆波，张建博.中国煤层气研究与勘探进展（一）[M].徐州：中国矿业大学出版社，2001：5-9. [2] 倪小明，苏现波，张小东.煤层气开发地质学[M].北京：化学工业出版社，2010. [3] 秦勇，傅雪海，韦重韬，等.煤层气成藏动力条件及其控藏效应[M].北京：科学出版社，2012. [4] 张小东，刘炎昊，桑树勋，等.高煤级煤储层条件下的气体扩散机制[J].中国矿业大学学报，2011,40（1）：43-48. [5] 刘爱华，付雪梅，梁文庆，等.不同煤阶煤孔隙分布特征及其对煤层气开发的影响[J].煤炭科学技术，2013,41（4）：104-108. [6] 宋晓夏，唐跃刚，李伟，等.基于显微CT的煤渗流孔精细表征[J].煤炭学报，2013,38（3）：435-440. [7] 吴财芳，秦勇.煤储层弹性能及其控藏效应：以沁水盆地为例[J].地学前缘,2012,19（2）：248-256. [8] 杨兆彪，秦勇，陈世悦，等.多煤层储层能量垂向分布特征及控制机理[J].地质学报，2013,87（1）：139. [9] 赵金，张遂安.煤层气井底流压生产动态研究[J].煤田地质与勘探，2013,41（2）：21-25. [10] 杜严飞，吴财芳，邹明俊，等.煤层气排采过程中煤储层压力传播规律研究[J].煤炭工程，2011（7）：87. [11] Airey E M. Gas emission from broken coal:an experimental and theoretical investigation[J]. International Journal of Rock Mechanics and Mining Sciences,1968,5(6):475-494. [12] Joubert J L,Grein C T,Bienstock D.Sorption of methane in moist coal[J].Fuel,1973,52(3):181-185. [13] McKee C R,Bumb A C,Koenig R A.Stress-dependent permeability and porosity of coal and other geologic formations[J].SPE Formation Evaluation, 1988,3(1):81-91. [14] Levine J R. Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs[J].Geological Society ,1996, 109(1):197-212.
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