低渗煤层气注热开采渗透规律研究
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摘要
为分析低渗高储煤层注热开采时的渗透规律,通过实验室试验分析得出了山西许村煤矿3号煤在温度作用下渗透率发生巨变的渗透率临界阈值温度为350℃;通过理论分析得出了低渗储层注热开采的热-流-固数学模型,并基于该模型对热-流-固耦合作用下低渗储层注热开采的渗透规律进行了数值模拟研究,研究结果表明:随着注热时间的增加,储层渗透率也在不断的增大,当注热时间达到5 h时,储层渗透率较原始渗透率增加14倍左右,注热效果明显,5 h之后,注热对于储层渗透率的变化影响不大。
In order to research seepage laws in low permeability and high storage coal seam through injecting heat, through laboratory tests, it was concluded that critical threshold temperature was 350 ℃ when the permeability of 3~# coal seam of Shanxi Xucun Coal Mine happened great changes under temperature effect; thermal-fluid-solid mathematical model of injecting heat in low permeability coal seam is concluded through the theoretical analysis; based on this model, numerical simulation is used to study seepage regulation of low permeability and high storage coal seam through injecting heat under the action of heat-fluid-solid coupling.The results show that with the increase of injection time, coal seam permeability is increasing, when the injection time is 5 h, the coal seam permeability increases about 14 times than the original permeability, thermal effect is obvious, and thermal injection has little effect on change of coal seam permeability after 5 h.
In order to research seepage laws in low permeability and high storage coal seam through injecting heat, through laboratory tests, it was concluded that critical threshold temperature was 350 ℃ when the permeability of 3~# coal seam of Shanxi Xucun Coal Mine happened great changes under temperature effect; thermal-fluid-solid mathematical model of injecting heat in low permeability coal seam is concluded through the theoretical analysis; based on this model, numerical simulation is used to study seepage regulation of low permeability and high storage coal seam through injecting heat under the action of heat-fluid-solid coupling.The results show that with the increase of injection time, coal seam permeability is increasing, when the injection time is 5 h, the coal seam permeability increases about 14 times than the original permeability, thermal effect is obvious, and thermal injection has little effect on change of coal seam permeability after 5 h.
引文
[1]李志伟.低渗透煤层气注热开采及其渗透规律研究[D].太原:太原理工大学,2015.
[2]姜永东,阳兴洋,熊令,等.多场耦合作用下煤层气的渗流特性与数值模拟[J].重庆大学学报,2011,34(4):30-35.
[3]郝敏钗.低渗透煤层气注热开采过程效率分析[J].煤炭技术,2016,35(1):19-21.
[4]Saghafi A,Faiz M,Roberts D.Storage and gas diffusivity properties of coals from Sydney Basin[J].Australia:International Journal of Coal Geology,2007,70(1-3):240-254.
[5]杨新乐,任常在,张永利,等.低渗透煤层气注热开采热-流-固耦合数学模型及数值模拟[J].煤炭学报,2013,38(6):1044-1049.
[6]马玉林,张永利,程瑶,等.低渗透煤层瓦斯解吸渗流规律的试验研究[J].煤矿安全,2009,40(4):1-4.
[7]张凤婕,吴宇,茅献彪,等.煤层气注热开采的热-流-固耦合作用分析[J].采矿与安全工程学报,2012,29(4):505-510.
[8]许满贵,董康乾,董养存,等.煤岩与瓦斯微元体破坏突出机理[J].西安科技大学学报,2014,34(3):249.
[9]雷毅,申宝宏,刘见中.煤矿区煤层气与煤炭协调开发模式初探[J].煤矿开采,2012,17(3):1-4.
[10]李志凯,秦张峰,吴志伟,等.煤层气治理与利用技术研究开发进展[J].燃料化学学报,2013,41(7):787.
[2]姜永东,阳兴洋,熊令,等.多场耦合作用下煤层气的渗流特性与数值模拟[J].重庆大学学报,2011,34(4):30-35.
[3]郝敏钗.低渗透煤层气注热开采过程效率分析[J].煤炭技术,2016,35(1):19-21.
[4]Saghafi A,Faiz M,Roberts D.Storage and gas diffusivity properties of coals from Sydney Basin[J].Australia:International Journal of Coal Geology,2007,70(1-3):240-254.
[5]杨新乐,任常在,张永利,等.低渗透煤层气注热开采热-流-固耦合数学模型及数值模拟[J].煤炭学报,2013,38(6):1044-1049.
[6]马玉林,张永利,程瑶,等.低渗透煤层瓦斯解吸渗流规律的试验研究[J].煤矿安全,2009,40(4):1-4.
[7]张凤婕,吴宇,茅献彪,等.煤层气注热开采的热-流-固耦合作用分析[J].采矿与安全工程学报,2012,29(4):505-510.
[8]许满贵,董康乾,董养存,等.煤岩与瓦斯微元体破坏突出机理[J].西安科技大学学报,2014,34(3):249.
[9]雷毅,申宝宏,刘见中.煤矿区煤层气与煤炭协调开发模式初探[J].煤矿开采,2012,17(3):1-4.
[10]李志凯,秦张峰,吴志伟,等.煤层气治理与利用技术研究开发进展[J].燃料化学学报,2013,41(7):787.