Research on the microscopic distribution characteristics and storage capacity of CO2 with different displacement methods
Received date: 2016-12-03
Revised date: 2017-05-09
Online published: 2017-06-10
The form and distribution of CO2 under different displacement methods has been studied by visualization experimental equipment with the condition of high pressure and high temperature,and the storage capacity of CO2 has also been investigated by image analysis technology.Experimental results show that,free state CO2 mainly distributed on the top of the model under the immiscible displacement,and the storage mechanism is structure and stratigraphic trapping.While under the miscible displacement it mainly distributed on the middle and upper parts of the model,and the oil and CO2 miscible zone will locate in the lower part of the model,and the storage mechanism is structure and stratigraphic trapping and dissolution trapping in the remaining oil.During the experiment of water alternating gas(WAG) displacement,the sweep area of free state CO2 spreads from the mainstream line to both sides,the diffusion degree gradually decreases from the inject end to the output end,and the CO2 is dissolved in the injected water,and the storage mechanism is structure and stratigraphic trapping,dissolution trapping in the injected water and the remaining oil.The distribution of CO2 under the WAG miscible displacement and CO2 miscible displacement after water displacement is consistent,in which the free state CO2 and miscible CO2 discretely distributed in the model,and the CO2 was dissolved in the injected water,and the storage mechanism is structure and stratigraphic trapping,dissolution trapping in the injected water and the remaining oil.The calculation of storage capacity shows that,the storage capacity under the miscible condition is higher than that under the immiscible condition,and structure trapping is the main form of CO2 storage.The storage capacity of CO2 miscible displacement after water flooding is excellent,which means the reservoir after water flooding is anideal place for CO2 storage.
Hao Yong-mao，Wei Xin-lin，Dong Cheng-shun . Research on the microscopic distribution characteristics and storage capacity of CO2 with different displacement methods[J]. Natural Gas Geoscience, 2017 , 28(6) : 846 -851 . DOI: 10.11764/j.issn.1672-1926.2017.06.008
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