Laboratory characterisation of coal reservoir permeability for primary and enhanced coalbed methane recovery
Laboratory characterisation of coal reservoir permeability for primary and enhanced coalbed methane recovery
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DOI：
10.1016/j.coal.2009.10.019
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发表时间：
2010-06-01
影响因子：
5.6
通讯作者：
Camilleri, Michael
中科院分区：
文献类型：
--
作者：
Pan, Zhejun;Connell, Luke D.;Camilleri, Michael
煤渗透率对应力高度敏感同时，煤随着气体吸附而膨胀，并且随着气体解吸而收缩。在储层条件下，这些应变变化影响割理孔隙度，从而影响渗透率。煤渗透率模型，例如Palmer和Mansoori以及Shi和Durucan模型，使用近似地质力学方法将应力和膨胀/收缩效应与渗透率联系起来。因此，为了应用这些模型，必须估计煤的应力-渗透率行为、膨胀/收缩行为和地质力学性质。本文提出了一种用于油藏模拟ECBM和煤中CO2封存的Palmer和Mansoori以及Slit和Durucan渗透率模型的实验室表征方法。在这项工作中，一个三轴电池被用来测量气体渗透率，吸附，膨胀和地质力学性质的煤芯在一系列的孔隙压力和甲烷，二氧化碳和氦气的孔隙压力高达13 MPa和围压高达20 MPa。渗透率模型的属性，如割理压缩性，杨氏模量，根据实验测量结果计算了泊松比和吸附诱导膨胀。给出了澳大利亚煤的测量结果。结果表明，渗透率随围压和孔隙压力显著降低，渗透率随孔隙压力的降低是吸附的直接结果。煤岩地质力学性质随瓦斯压力和瓦斯种类的变化而变化，实验结果还表明，煤割理压缩系数随气体种类和压力的变化而变化然后将测量的性质应用于Shi和Durucan模型中，以研究煤中CO2封存过程中的渗透性行为（C）2009 Elsevier B V All rights reserved
Coal permeability is highly sensitive to the stress Meanwhile, coal swells with gas adsorption, and shrinks with gas desorption Under reservoir conditions these strain changes affect the cleat porosity and thus permeability Coal permeability models, such as the Palmer and Mansoori and Shi and Durucan models, relate the stress and swelling/shrinkage effect to permeability using an approximate geomechanical approach Thus in order to apply these models, stress-permeability behaviour, swelling/shrinkage behaviour and the geomechanical properties of the coal must be estimated This paper presents a methodology for the laboratory characterization of the Palmer and Mansoori and Slit and Durucan permeability models for reservoir simulation of ECBM and CO2 sequestration in coal. In this work a triaxial cell was used to measure gas permeability, adsorption, swelling and geomechanical properties of coal cores at a series of pore pressures and for CH4, CO2 and helium with pore pressures up to 13 MPa and confining pressures up to 20 MPa. Properties for the permeability models such as cleat compressibility, Young's modulus, Poisson's ratio and adsorption-induced swelling are calculated from the experimental measurements Measurements on an Australian coal are presented The results show that permeability decreases significantly with confining pressure and pore pressure The permeability decline with pore pressure is a direct result of adsorption-induced coal swelling Coal geomechanical properties show some variation with gas pressure and gas species, but there is no direct evidence of coal softening at high CO2 pressures for the coal sample studied The experimental results also show that cleat compressibility changes with gas species and pressure Then the measured properties were applied in the Shi and Durucan model to investigate the permeability behaviour during CO2 sequestration in coal (C) 2009 Elsevier B V All rights reserved