西南石油大学学报(自然科学版) ›› 2017, Vol. 39 ›› Issue (6): 140-146.DOI: 10.11885/j.issn.1674-5086.2016.03.25.04

• 石油与天然气工程 • 上一篇    下一篇

压降及储层压力与煤变形的相关性研究

石迎爽1, 梁冰1, 孙维吉1, 石兆彬2, 薛璐3   

  1. 1. 辽宁工程技术大学力学与工程学院, 辽宁 阜新 123000;
    2. 东北煤田地质局107勘探队, 辽宁 阜新 123000;
    3. 中建一局集团建设发展有限公司, 北京 朝阳 100102
  • 收稿日期:2016-03-25 出版日期:2017-12-01 发布日期:2017-12-01
  • 通讯作者: 孙维吉,E-mail:sunweiji-1231@163.com
  • 作者简介:石迎爽,1989年生,女,汉族,河北衡水人,博士研究生,主要从事非常规天然气流动理论及应用的研究。E-mail:shileilei.hi@163.com;梁冰,1962年生,女,汉族,辽宁盘锦人,教授,博士,主要从事非常规天然气赋存运移机理及开发评价。E-mail:lbwqx@163.com;孙维吉,1980年生,男,汉族,辽宁铁岭人,讲师,博士,主要从事煤层气等非常规天然气开采理论研究。E-mail:sunweiji-1231@163.com;石兆彬,1982年生,男,汉族,山东肥城人,工程师,主要从事煤层气勘探开发方面的工作。E-mail:82754658@qq.com;薛璐,1989年生,男,汉族,辽宁海城人,工程师,主要从事地下岩土工程方面的工作。E-mail:xx656349578@163.com
  • 基金资助:
    国家自然科学基金(51304111);国家重点研发计划(2016YFC0600704,2016YFC0801404)

A Study on the Correlation between the Pressure Drawdown Gradient and Reservoir Pressure and the Coal Deformation

SHI Yingshuang1, LIANG Bing1, SUN Weiji1, SHI Zhaobin2, XUE Lu3   

  1. 1. Institute of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China;
    2. Institute of Geology, No. 107 Exploration Team, Northeast Coalfield Geological Bureau, Fuxin, Liaoning 123000, China;
    3. China Construction First Group Construction & Development Co. Ltd., Chaoyang, Beijing 100102, China
  • Received:2016-03-25 Online:2017-12-01 Published:2017-12-01

摘要: 为了进一步完善解吸瓦斯煤体变形机理,探讨压降和储层压力对煤解吸瓦斯的影响,采用原煤试件,进行了不同储层压力和压降的煤解吸瓦斯变形实验。实验结果表明,解吸达到平衡所需时间与储层压力及压降呈正相关关系;降压0.3 MPa时,收缩应变随储层压力的增加而减小;降压至大气压时,收缩应变随储层压力的增大而增大,储层压力0.9 MPa的大于储层压力0.6 MPa的大于储层压力0.3 MPa的;当储层压力相同时,收缩应变随压降的增大而增加;当储层压力较小时,大压降储层瓦斯解吸量大于小压降储层瓦斯解吸量。

关键词: 压降, 储层压力, 解吸, 收缩变形, 相关性

Abstract: In order to further understand the deformation mechanism of desorbed gas (coalbed methane) coal and to investigate the effects of pressure drawdown gradient and original reservoir pressure on the desorbed gas from coal (coalbed methane), desorbed gas (coalbed methane) coal deformation tests were performed using raw coal samples under different original reservoir pressures and pressure drawdown gradients. The results showed that the time required for desorption to reach equilibrium has a positive correlation with the original reservoir pressure and the pressure drawdown gradient. When the pressure is reduced to 0.3 MPa, the shrinkage strain decreases with an increase in the original reservoir pressure. When the pressure is reduced to atmospheric pressure, the variation in the shrinkage strain with the original reservoir pressure follows the trend that under 0.9 MPa it is higher than that under the 0.6 MPa, which is higher than that under 0.3 MPa. When the original reservoir pressure is the same, the shrinkage strain increases with an increase in the pressure drawdown gradient. When the original reservoir pressure is relatively small, the desorption capacity of the high pressure gradient reservoir is larger than that of the low pressure gradient reservoir.

Key words: reservoir pressure, pressure drawdown gradient, reservoir pressure, desorption, shrinkage deformation

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