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首页> 外文期刊>Journal of Petroleum Science & Engineering >Gas permeability model considering rock deformation and slippage in low permeability water-bearing gas reservoirs
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Gas permeability model considering rock deformation and slippage in low permeability water-bearing gas reservoirs

机译：低渗透含水气藏中考虑岩石变形和滑移的透气度模型

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摘要

Permeability measurement is necessary in oil and gas fields. During the measurement, slippage, rock deformation, and water saturation affect apparent permeability of low permeability sandstones measured by different fluids. It is well known that gas slippage effect is very obvious and crucial in apparent permeability of low permeability sandstones measured for gas. Klinkenberg correlation was proposed to calculate gas permeability and absolute permeability for low permeability sandstones without considering rock deformation and water saturation. Most previous researchers modified the slippage factor b as a function of absolute permeability, porosity, and water saturation. However, few models were proposed for gas permeability calculation, simultaneously considering effects of rock deformation, gas slippage, and water saturation. In this work, Klinkenberg correlation was extended for permeability calculations measured by liquid and gases. The difference between apparent liquid permeability and apparent gas permeability was that gas slippage, which was much more evident from liquid slippage. An apparent gas permeability model was proposed for gas permeability and absolute permeability calculation simultaneously considering rock deformation, gas slippage, and water saturation in low permeability sandstones. The apparent gas permeability is proportional to the term T/p. Both the interception and the slope of the straight line in the T/p-k_g plot with Cartesian coordinate were power law functions of net stress and gas saturation. Some experimental data from literature were applied to validate the proposed model. Good agreements between experimental data and those evaluated by the proposed model were obtained. The apparent gas permeability model proposed in this work will be useful to professionals involved in laboratory measurement of low permeability waterbearing rocks, modeling well performance, and gas production forecasting.
机译：在石油和天然气领域，必须进行渗透率测量。在测量过程中，滑移，岩石变形和水饱和度会影响通过不同流体测量的低渗透性砂岩的表观渗透率。众所周知，瓦斯滑移作用非常明显，并且对于低渗透性砂岩的表观渗透率至关重要。提出了Klinkenberg相关性，以在不考虑岩石变形和水饱和度的情况下计算低渗透率砂岩的透气率和绝对渗透率。先前的大多数研究人员将滑移系数b修改为绝对渗透率，孔隙率和水饱和度的函数。但是，很少有人提出模型来计算透气度，同时考虑了岩石变形，瓦斯滑移和水饱和度的影响。在这项工作中，克林根贝格相关性扩展到了通过液体和气体测量的渗透率计算。表观液体渗透率和表观气体渗透率之间的差异在于气体滑移，这从液体滑移更加明显。在考虑岩石变形，瓦斯滑移和低渗透性砂岩中水饱和度的同时，提出了视在气体渗透率模型，用于同时计算气体渗透率和绝对渗透率。表观气体渗透率与术语T / p成比例。具有直角坐标的T / p-k_g图中直线的截距和斜率都是净应力和气体饱和度的幂律函数。一些来自文献的实验数据被用于验证所提出的模型。实验数据与所提出的模型评估的数据之间取得了良好的一致性。在这项工作中提出的表观气体渗透率模型将对从事低渗透性含水岩的实验室测量，对油井性能进行建模以及天然气产量预测的专业人员有用。

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