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首页> 外文期刊>Journal of natural gas science and engineering >Modeling and application of coalbed methane recovery performance based on a triple porosity/dual permeability model
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Modeling and application of coalbed methane recovery performance based on a triple porosity/dual permeability model

机译：基于三重孔隙/双重渗透率模型的煤层气采收率建模与应用

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The triple porosity/dual permeability (TPDP) model is an advanced coalbed methane (CBM) model for recovery simulation, which processes CBM flows via desorption and diffusion into permeation pores and moves sequentially via Darcy flow through permeation pores and cleats, and, finally, into the wellbore. Based on this theory, this paper describes the mathematical models of desorption, diffusion and permeation during CBM drainage; conducts the measurements of routine core analyses to obtain fluid characteristics, rock mechanics, coal seam domain, diffusion pore property and fracturing property, and nuclear magnetic resonance to acquire porosity and permeability of permeation pores and cleats; and, finally, takes a typical CBM well named QSDU01, located in the Qinshui basin in China, as an example to simulate its recovery performance. The following conclusions are reached. Compared with a dual porosity/single permeability (DPSP) model, the TPDP model is more advanced and can effectively eliminate the slight nonconformities caused by the DPSP model. Reservoir pressure, gas content, porosity and permeability initially decrease rapidly and subsequently slow during the CBM drainage process. The decreased amplitudes of parameters become larger as the distance to the wellbore decreases. Variations of parameters can be divided into two stages, corresponding with the stages of free gas drainage and desorbed gas drainage. The decreased amplitudes of parameters are quite small in the first stage and relatively larger in the second stage. Gas peaks lead to the turning points of the variation curves and cause the variation curves to exhibit a type of multisection. (C) 2015 Elsevier B.V. All rights reserved.
机译：三重孔隙度/双重渗透率（TPDP）模型是用于恢复模拟的高级煤层气（CBM）模型，该模型通过解吸和扩散处理CBM流量并渗透到渗透孔中，然后通过Darcy流量依次移动穿过渗透孔和割理，最后，进入井眼。基于这一理论，本文描述了煤层气排空过程中解吸，扩散和渗透的数学模型。进行常规岩心分析的测量，以获得流体特征，岩石力学，煤层区域，扩散孔隙特性和压裂特性以及核磁共振，以获取渗透孔隙和夹层的孔隙度和渗透率;最后，以位于中国沁水盆地的典型煤层气井QSDU01为例，模拟其采收率。得出以下结论。与双孔隙/单渗透率（DPSP）模型相比，TPDP模型更为先进，可以有效消除由DPSP模型引起的轻微不整合。在煤层气抽采过程中，储层压力，气体含量，孔隙度和渗透率最初迅速下降，随后缓慢下降。随着到井眼距离的减小，参数减小的幅度变得更大。参数的变化可以分为两个阶段，分别对应于自由气体排放和解吸气体排放的阶段。参数减小的幅度在第一阶段很小，而在第二阶段则相对较大。气体峰值导致变化曲线的转折点，并导致变化曲线表现出一种多截面的类型。 （C）2015 Elsevier B.V.保留所有权利。

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