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首页> 外文会议>SPE Canadian Unconventional Resources Conference >Use of Gas Adsorption Data to Extract Diffusivity/Permeability from Shale Reservoir Drill Cuttings: Implications for Reservoir Characterization of Horizontal Laterals in Western Canadian Shale Plays
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Use of Gas Adsorption Data to Extract Diffusivity/Permeability from Shale Reservoir Drill Cuttings: Implications for Reservoir Characterization of Horizontal Laterals in Western Canadian Shale Plays

机译：使用气体吸附数据从页岩储层钻头提取扩散率/渗透性：在加拿大西部的水平侧面的储层表征中的影响

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There is considerable research interest in the sorption/transport properties of shales to assist in the evaluation of shales as reservoirs for natural gas and oil. These properties can also be used to evaluate the potential of shales for storage of greenhouse gases (e.g. CO2) or enhanced recovery. However, shales have proven difficult to characterize, in part because of the challenges of obtaining viable reservoir samples from multi-fractured horizontal wells used to produce from them. Often the only reservoir samples available from horizontal wells are drill cuttings - the sample sizes obtained from cuttings are typically too small for quantitative analysis using conventional techniques. Therefore, new, high-precision methods are required to analyze the smaller cuttings sets. Further, the physics of gas storage and transport through the multi-model pore structure of shale is complex, requiring rigorous modeling approaches to extract parameters of interest such as permeability/diffusivity. In this work, the use of a high-precision, low-pressure adsorption device is explored for extracting permeability/diffusivity parameters from small amounts (2 g) of synthetic (crushed core sample) drill cuttings of Duvernay shale. In order to extract the transport parameters, gas flow through the complex, heterogeneous matrix pore structure of the shale has been approximated using a general dual porosity numerical model which assumes that (1) gas flows through macropores by continuum viscous flow (2) gas flows through meso and micropores by Knudsen diffusion and molecular slippage on pore walls and (3) adsorption occurs in meso and micropores. The model can be simplified into two sub-models; macro/ micropore system and meso/micropore system, depending on the measured pore size distribution of the samples of interest. The new multi-pore (bidisperse) numerical model is applied to carbon dioxide low-pressure adsorption rate data obtained from the crushed Duvernay shale core samples, and apparent permeability for each gas/sample group is calculated at different pressure steps. The low-pressure adsorption device yields pressure-time data that is of much better quality than a commercial crushed rock permeability device that requires larger sample sizes. The new bidisperse pore structure numerical model, which allows permeability to vary (at each pressure step) due to gas slippage effects, properly describes the entire adsorption rate history of the samples studied. Mesopore apparent permeabilities range from 1E~(-2)-1E~(-3) mD and micropore apparent diffusivities are in the IE~(-7) mD range. The calculated apparent diffusivities obtained from modeling adsorption rate data change with pressure. The results of this study have important implications for shale matrix transport characterization. The resulting data can be used for making completions decisions and in reservoir models which capture reservoir property changes along a horizontal lateral.
机译：Shales的吸附/运输特性有相当大的研究兴趣，协助评估Shales作为天然气和油的水库。这些性能也可用于评估Haales用于储存温室气体（例如CO2）或增强的恢复。然而，Shales已经证明难以表征，部分原因是获得来自用于生产的多骨折水平孔的可行储层样本的挑战。通常，水平孔可获得的唯一储存器样品是钻杆 - 从切屑中获得的样本尺寸通常太小，无法使用常规技术进行定量分析。因此，需要新的高精度方法来分析较小的切屑组。此外，通过页岩的多模型孔结构气体存储和运输物理学是复杂的，需要严格的建模方法来提取诸如渗透性/扩散性的感兴趣的参数。在这项工作中，使用高精度低压吸附装置的使用，用于从杜弗杜瓦莱的少量（2g）的少量（2g）的少量（2g）钻头的渗透性/扩散参数的渗透性/扩散参数。为了提取传送参数，使用一般的双孔隙率数模型近似的气体流过复合物，异质基质孔结构，该数值模型假定（1）气体通过连续粘性流动（2）气流流过大麦克风通过Chodsen扩散和孔隙壁的扩散和分子滑动的Meso和Micropage以及在Meso和微孔中发生吸附。该模型可以简化为两个子模型;宏/微孔系统和MESO /微孔系统，取决于测量的孔径分布的感兴趣的样本。新的多孔（BIDISPERSE）数值模型应用于从碎杜弗氏岩石核心样品获得的二氧化碳低压吸附速率数据，并且在不同的压力步骤下计算每个气体/样品组的表观渗透率。低压吸附装置产生的压力 - 时间数据与需要更大样本尺寸的商业碎岩渗透装置具有更好的质量。新的Bodeperse孔结构数值模型，其允许渗透率（在每个压力步骤中）由于气体滑动效应而妥善描述所研究的样本的整个吸附速率历史。中孔表观渗透率范围从1E〜（-2）-1e〜（-3）MD和微孔表观扩散性在IE〜（-7）MD范围内。从建模吸附速率数据随压力改变而获得的计算出表观扩散性。该研究的结果对页岩矩阵传输表征具有重要意义。得到的数据可用于制定完成决策和储层模型，该模型沿水平横向捕获储层性能变化。

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