状态方程对页岩吸附甲烷等温线的影响  

Impact of Equations of State on Methane Adsorption Isotherms of Shales

作　　者：何斌[1,2] 宁正福[1,2] 杨峰[1,2] 孔德涛[1,2] 彭攀[1,2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学石油工程教育部重点实验室,北京102249

出　　处：《新疆石油地质》2014年第4期442-446,共5页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(51274214);教育部科技研究项目(311008);油气资源与探测国家重点实验项目(PRP/indep-3-1108)

摘　　要：通过比较3种通用状态方程和1种经验方程计算的甲烷压缩因子,分别计算了4种状态方程的页岩吸附甲烷等温线,并与美国国家标准与技术研究院(NIST)的标准参考数据库计算的结果进行了对比。结果表明,不同状态方程计算的吸附等温线存在显著差异,状态方程对吸附量的影响在平衡压力低于4 MPa时较小,在中-高压力之后影响迅速增大,特别是压力高于13 MPa后,等温线形状发生了根本变化,这主要是由于不同状态方程计算的吸附增量在中-高压力之后差距越来越大所致,而在低压力条件下这种影响较小。This paper presents the comparisons of methane compressibility factors from universal three equations of state （EOS） and one empirical EOS. By the four EOSs the shale＇ s adsorption methane isotherms are calculated, respectively, and then the comparative analysis with the result given by the NIST standard reference database is conducted. The results show that adsorption isotherms calculated by different EOSs have significant differences and the EOS has less effect on the adsorption at equilibrium pressure less than 4 MPa, and the effect will quickly increase after mid-high pressure. Especially when the pressure is higher than 13 MPa, the shape of the isotherms will greatly change. It is mainly caused by gradually larger adsorption from different EOSs after the mid-high pressure, while at low pressure this effect is not big.

关 键 词：页岩 状态方程 甲烷 压缩因子 吸附等温线 

分 类 号：TE122.2[石油与天然气工程—油气勘探] TE124.1