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首页> 外文期刊>Chinese science bulletin >Mechanism of production increasing of coalbed gas for the pinnate horizontal well and sensitivity effect of parameters on gas production
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Mechanism of production increasing of coalbed gas for the pinnate horizontal well and sensitivity effect of parameters on gas production

机译:羽状水平井煤层气增产机理及参数对天然气产量的敏感性影响

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摘要

The mechanism of production increasing for the pinnate horizontal well is analyzed with the simulation technique. It is pointed out that the whole horizontal well-bore spreading widely and evenly in coal layers makes the stratum pressure drop evenly and fast, which increases the chance of desorption and diffusion and area controlled. This is the basic reason that the pinnate horizontal well can increase production. How such stratum parameters as permeability, Langmuir constants and adsorption time constant affect the gas production for the pinnate horizontal well is also studied with numerical simulations. Either for the vertical well or the pinnate horizontal well, bigger stratum permeability, steeper relative permeability curve, smaller residual gas saturation, higher gas content and stratum pressure are more favorable for gas production increasing. Langmuir constants decide the change of desorption quantity and influence the gas production through changing the extent of steep of isothermal adsorption curves in the pressure dropping area. The adsorption time constant only influences the time that gas production arrives at the maximum value for the vertical well, but it almost has no influence on the gas production for the pinnate horizontal well because the equivalent adsorption time constant is reduced.
机译:利用模拟技术分析了羽状水平井增产机理。指出,整个水平井眼在煤层中广泛而均匀地分布,使地层压力均匀,快速下降,增加了解吸扩散的机会,控制了面积。这是羽状水平井可以提高产量的基本原因。还通过数值模拟研究了诸如渗透率,朗缪尔常数和吸附时间常数等地层参数如何影响羽状水平井的产气量。无论是垂直井还是羽状水平井,地层渗透率较大,相对渗透率曲线较陡,剩余气饱和度较小,瓦斯含量和地层压力较高更有利于天然气产量的增加。 Langmuir常数通过改变压降区等温吸附曲线的陡峭程度来决定解吸量的变化并影响产气量。吸附时间常数仅影响垂直井的产气量达到最大值的时间,但由于降低了等效吸附时间常数,因此对羽状水平井的产气量几乎没有影响。

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