摘要
用实验方法揭示了高温高压下CO_2注入煤层后发生物理和化学反应对储层特征的影响。CO_2与煤的物理作用会改变煤岩应变和渗透率,随着CO_2注入压力的增大,体积应变增大,围压对煤体应变起抑制作用,围压12 MPa时,煤岩渗透率先降低后增加,围压12 MPa和16 MPa时,渗透率降低增加再降低。CO_2与煤中方解石、钾长石产生化学反应导致煤中矿物组成、水质和渗透率发生变化。
The influence of physical and chemical reactions on reservoir characteristics after CO2 injection into coal seams under high temperature and high pressure is revealed experimentally. With the increase of CO2 injection pressure, the volumetric strain increases, and the volume strain of unit injection gas pressure increases. When the confining pressure is 12 MPa and 16 MPa, the permeability decreases and then increases and decreases again. The chemical reaction between CO2 and calcite and potassium feldspar in coal leads to the change of mineral composition, water quality and coal permeability.
作者
刘成龙
王延斌
LIU Cheng-long WANG Yan-bin(Earth Science and Surveying Engineer/ng, China University of Mining and Technology （Beijing）, Beijing 100083, China)
出处
《煤炭技术》
北大核心
2017年第5期47-49,共3页
Coal Technology
基金
国家科技重大专项(2011ZX05042-003)
关键词
CO2
应变
矿物组成
水质
渗透率
CO2
strain
mineral composition
water quality
permeability
