梁冰, 秦冰, 陈天宇, 孙维吉, 代媛媛. 侵入型火成岩对煤层气水平井产能影响的研究[J]. 工程力学, 2014, 31(9): 245-251. DOI: 10.6052/j.issn.1000-4750.2013.04.0304
引用本文: 梁冰, 秦冰, 陈天宇, 孙维吉, 代媛媛. 侵入型火成岩对煤层气水平井产能影响的研究[J]. 工程力学, 2014, 31(9): 245-251. DOI: 10.6052/j.issn.1000-4750.2013.04.0304
LING Bing, QIN Bing, CHEN Tian-yu, SUN Wei-ji, DAI Yuan-yuan. EFFECTS OF INTRUSIVE IGNEOUS ROCK ON COAL-BED METHANE HORIZONTAL WELL PRODUCTIVITY[J]. Engineering Mechanics, 2014, 31(9): 245-251. DOI: 10.6052/j.issn.1000-4750.2013.04.0304
Citation: LING Bing, QIN Bing, CHEN Tian-yu, SUN Wei-ji, DAI Yuan-yuan. EFFECTS OF INTRUSIVE IGNEOUS ROCK ON COAL-BED METHANE HORIZONTAL WELL PRODUCTIVITY[J]. Engineering Mechanics, 2014, 31(9): 245-251. DOI: 10.6052/j.issn.1000-4750.2013.04.0304

侵入型火成岩对煤层气水平井产能影响的研究

EFFECTS OF INTRUSIVE IGNEOUS ROCK ON COAL-BED METHANE HORIZONTAL WELL PRODUCTIVITY

  • 摘要: 选取具有复杂地质条件的阜新刘家煤层气区块为研究对象,建立气体解吸、扩散、排采过程中压力改变引起孔隙度、渗透率动态变化的双重系统渗流模型,并建立包含复杂地质构造的非均质煤层气藏地质模型,分析火成岩侵入对水平井产能影响。分析结果表明:煤层气藏储层压力扩展受复杂地质构造影响明显;在两条火成岩之间设置水平井SPJ1,中间位置煤层气解吸面积和储层压降漏斗影响范围最大,压力下降更充分;在火成岩以及断层之间设置水平井SPJ2,既要考虑削弱断层影响,又要与北侧火成岩距离适中,模拟得出距离火成岩140m最合理,压降漏斗下降幅度大,漏斗范围内煤层气采出量最充分。对比分析SPJ1与SPJ2发现,在刘家区所选区块应在SPJ2位置建水平井。

     

    Abstract: Choosing the Fuxin LiuJia Coal-bed Methane block as the study subject, a dual system seepage model is established in this study to simulate the dynamics of porosity and permeability resulted from pressure variation during gas desorption, diffusion and drainage. A geological model of heterogeneous coal-bed methane reservoir is also established involving complex geological tectonics. The influence on the productivity of horizontal wells from igneous rock intrusion is analyzed. Results show that the pressure expansion of Coal-bed Methane reservoir is remarkably affected by complicated geological tectonics. Locating a horizontal well SPJ1 in between two igneous rock zones leads to a substantial pressure drop and large methane desorption area in the middle of the two zones. On the other hand, when a horizontal well SPJ2 is located between the igneous rock zone and a fault zone, the effect of weaken fault and an appropriate distance from the northern igneous rock zone need to be taken into consideration. Modelling results show that 140m is the optimal distance from the igneous rock zone, where the maximum pressure drop and coal-bed methane production are detected. The comparison between SPJ2 and SPJ1 suggests that horizontal wells in LiuJia block be placed at SPJ2.

     

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