基于竞争吸附的页岩气藏提高采收率机理

doi:10.7657/XJPG20210215

摘要/Abstract

摘要：

为研究注CO₂提高页岩气藏采收率的机理以及确定合理的注入参数,以页岩吸附解吸实验为基础,对比了页岩自然降压开采和在不同注入压力、注入速率下注CO₂开采页岩气藏的实验结果,研究了降压开采和注CO₂开采2种方式下CH₄的采气速率和采收率的变化。结果表明,在相同实验条件下,CO₂吸附能力最强,CH₄次之,N₂最弱,N₂解吸能力最强,CH₄次之,CO₂最弱;3种气体的等温解吸曲线相对于等温吸附曲线均存在一定的滞后,CO₂的滞后现象最为明显;降压开采的采收率较低,注CO₂可以有效提高CH₄的采气速率,延长稳产时间,使累计产气量快速增长;在一定注入压力和注入速率范围内,CH₄采收率随着CO₂注入压力和注入速率的增加而增加,但其增加幅度因岩心孔隙度和渗透率的不同而有所不同。

关键词: 页岩气藏, 竞争吸附, CO₂驱, 吸附能力, 解吸能力, 参数优化, 提高采收率

Abstract:

In order to study the mechanism of injecting CO₂ to increase the recovery of shale gas reservoirs and determine reasonable injection parameters, the experimental results of the production of shale gas reservoir developed by natural pressure drop and by injecting CO₂ at different pressure and rates were compared based on shale adsorption and desorption experiments, and the changes in CH₄ production rate and recovery factor under the two methods were studied. The results show that under the same experimental conditions, as to adsorption capacity, CO₂ is the strongest, followed by CH₄, and then N₂, while as to desorption capacity, N₂ is the strongest, followed by CH₄, and then CO₂. Compared with the isothermal adsorption curves, the isothermal desorption curves of the three kinds of gas are hysteretic to a certain extent, and the hysteresis of CO₂ is the most obvious. The recovery factor of shale reservoirs developed by natural pressure drop is low, while CO₂ injection can effectively increase the production rate of CH₄, greatly prolong stable production and increase cumulative gas production. Within certain ranges of injection pressure and injection rate, the CH₄ recovery increases with the increase of CO₂ injection pressure and injection rate, but the increment varies with core porosity and permeability.

Key words: shale gas reservoir, competitive adsorption, CO₂ flooding, adsorption capacity, desorption capacity, parameter optimization, enhanced gas recovery

中图分类号:

TE311

孙莹, 孙仁远, 刘晓强, 李淑霞. 基于竞争吸附的页岩气藏提高采收率机理[J]. 新疆石油地质, 2021, 42(2): 224-231.

SUN Ying, SUN Renyuan, LIU Xiaoqiang, LI Shuxia. Mechanism of Enhanced Gas Recovery in Shale Gas Reservoirs Based on Competitive Adsorption[J]. Xinjiang Petroleum Geology, 2021, 42(2): 224-231.

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