USBM方法在页岩气含气量测试中的适应性

doi:10.7623/syxb201606011

石油学报 ›› 2016, Vol. 37 ›› Issue (6): 802-806,814.DOI: 10.7623/syxb201606011

USBM方法在页岩气含气量测试中的适应性

姚光华¹, 王晓泉¹, 杜宏宇¹, 宜伟¹, 郭梅², 向锐², 力志强³

1. 重庆矿产资源开发有限公司重庆 401123;
2. 北京宏德石油科技有限公司北京 100080;
3. 中国石油渤海钻探有限公司井下作业公司天津 300457

收稿日期:2015-12-09 修回日期:2016-02-26 出版日期:2016-06-25 发布日期:2016-06-30
通讯作者: 姚光华,男,1963年5月生,1986年获西安矿业学院煤田地质与勘探专业学士学位,现为重庆矿产资源开发有限公司总经理、高级工程师,主要从事页岩气、煤层气等非常规能源综合研究及勘探管理工作。Email:yiwei19831113@163.com
作者简介:姚光华,男,1963年5月生,1986年获西安矿业学院煤田地质与勘探专业学士学位,现为重庆矿产资源开发有限公司总经理、高级工程师,主要从事页岩气、煤层气等非常规能源综合研究及勘探管理工作。Email:yiwei19831113@163.com
基金资助:
国家重大科技专项(2011ZX05018-005)资助。

Applicability of USBM method in the test on shale gas content

Yao Guanghua¹, Wang Xiaoquan¹, Du Hongyu¹, Yi Wei¹, Guo Mei², Xiang Rui², Li Zhiqiang³

1. Chongqing Mineral Resources Development Company Limited, Chongqing 401123, China;
2. Beijing Hongde Petroleum Technology Company Limited, Beijing 100080, China;
3. Downhole Operation Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300457, China

Received:2015-12-09 Revised:2016-02-26 Online:2016-06-25 Published:2016-06-30

摘要/Abstract

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,√t(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√t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。

关键词: 页岩, 含气量, USBM方法, 损失气, 适应性

Abstract:

Shale gas content is a key parameter for shale evaluation and development index prediction. The current test method of shale gas content is almost the same to that of coalbed methane content. Mechanical analysis and theoretical calculation are performed to prove whether USBM method is applicable to test the shale gas content. This study shows that:(1) The gas force analysis in shale core indicates that under different pressure coefficients, the core is lifted with core barrel in the shaft; the resultant force of pore pressure, hydrostatic mud pressure and capillary pressure at different positions shows different sizes and directions; natural gas escaping rate is also different with nonlinearity. (2) If using USBM method for gas reservoirs with normal pressure coefficient, the calculation time of gas loss is earlier, resulting in the larger gas loss; while for gas reservoirs with abnormally high pressure, the calculation time of gas loss is later, which might lead to the smaller gas loss. (3) Theoretical calculation results show that the duration time under the radical sign has a linear relationship with the accumulated desorption volume in early period, but such linear segment is not beyond the origin point, and the use of USBM method leads to additional gas loss volume. In the meantime, the slope of linear segment increases as the gas loss time is added to the time under the radical sign, resulting in further increase of the fitted gas loss value. Both results indicate that USBM method cannot be used for calculating gas loss, because it is inadaptable to the characteristics of shale with great buried depth in China. Therefore, it is necessary to explore a new test method of gas content based on Chinese shale gas characteristics.

Key words: shale, gas content, USBM method, gas loss, applicability

中图分类号:

TE135

姚光华, 王晓泉, 杜宏宇, 宜伟, 郭梅, 向锐, 力志强. USBM方法在页岩气含气量测试中的适应性[J]. 石油学报, 2016, 37(6): 802-806,814.

Yao Guanghua, Wang Xiaoquan, Du Hongyu, Yi Wei, Guo Mei, Xiang Rui, Li Zhiqiang. Applicability of USBM method in the test on shale gas content[J]. Acta Petrolei Sinica, 2016, 37(6): 802-806,814.

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USBM方法在页岩气含气量测试中的适应性

Applicability of USBM method in the test on shale gas content

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