USBM方法在页岩气含气量测试中的适应性

发布时间：2018-05-27 19:53

本文选题：页岩 + 含气量　；参考：《石油学报》2016年06期

【摘要】：页岩气含气量是页岩评价和开发指标预测的关键参数,目前的测试方法与煤层气含气量的测试方法几乎相同。为论证USBM(United States Bureau of Mine)方法是否适用于页岩的含气量测试,开展了力学分析和理论计算。研究表明:1井筒中岩心内的气体受力分析表明,不同压力系数下,岩心在井筒中随取心筒向上提升,不同位置的孔隙压力、泥浆静水压力和毛管压力的合力大小、方向不同,天然气的逸散速度不同,表现出非线性特征。2使用USBM方法,对于正常压力系数的气藏,损失气计算时间偏早,导致损失气计算结果偏大;而对于异常高压气藏,损失气计算时间偏晚,可能导致损失气计算结果偏小。3理论计算结果表明,i醫(t为实验解吸时间)与累积解吸量在初期呈线性关系,但是该线性段不过原点,用USBM方法会产生附加的损失气量。同时在i醫中加上了损失气量时间,增大了线性段的斜率,使得拟合的损失气量进一步增大。这2个结果证明,USBM方法不能用来计算损失气量,其不适应中国页岩埋藏较深的特点,因此有必要研究适合中国页岩气特点的含气量测试方法。
[Abstract]:The gas content of shale gas is the key parameter of shale evaluation and development index prediction. The present testing method is almost the same as that of coal bed methane. In order to prove whether USBM(United States Bureau of Mine) method is suitable for shale gas content measurement, mechanical analysis and theoretical calculation are carried out. The study shows that under different pressure coefficients, the pore pressure, slurry hydrostatic pressure and capillary pressure in different positions of pore pressure, mud hydrostatic pressure and capillary pressure are different in different pressure coefficients. For gas reservoirs with normal pressure coefficient, the calculation time of loss gas is early, which leads to the large calculation results of loss gas, while for abnormal high pressure gas reservoirs, The calculation time of the lost gas is late, which may result in the smaller calculation result of the lost gas. The result of theoretical calculation shows that there is a linear relationship between the experimental desorption time and the cumulative desorption amount, but the linear section is not the origin. Additional lost gas is generated by using the USBM method. At the same time, the slope of the linear segment is increased by adding the lost gas time to the I doctor, which makes the fitted gas loss increase further. These two results prove that the USBM method can not be used to calculate the gas loss, and it is not suitable for the deep burial of shale in China. Therefore, it is necessary to study the gas content measurement method suitable for the characteristics of shale gas in China.
【作者单位】：重庆矿产资源开发有限公司;北京宏德石油科技有限公司;中国石油渤海钻探有限公司井下作业公司;
【基金】：国家重大科技专项(2011ZX05018-005)资助
【分类号】：P618.13

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