Experimental Study on Acidization Alteration ofCoal Reservoir in the Southern Yanchuan,Ordos Basin
Received date: 2013-08-27
Revised date: 2013-10-29
Online published: 2014-05-10
Synthetically application of CBM geology,higher coal chemistry,coal petrology and petroleum engineering,new principle of coal reservoir stimulation was discussed.From the perspective of conventional reservoir acidification reconstruction,an experiment of acidization alteration of CO2 and mud acid was designed and made.Based on the results of conventional permeability,mercury injection,X-ray diffraction and SEM,the effect of acid treatment for the alteration of reservoirs was positive and productive.The minerals that coal reservoir contained were dissolved.The pore structures,seepage channels and the permeability of the coal samples after acidification were improved obviously.The main factors influencing the acidification of coal samples were the basic characteristics of porosity and permeability of coal samples before treated such as the minerals component and content,and the control of drainage after acidization alteration.
Key words： Coalbed; Reservoir; Porosity; Permeability; Acidization alteration; Control factors
YANG Song,CHI Sheng-ping,QIN Yong,ZHOU Cheng-xiang . Experimental Study on Acidization Alteration ofCoal Reservoir in the Southern Yanchuan,Ordos Basin[J]. Natural Gas Geoscience, 2014 , 25(5) : 761 -766 . DOI: 10.11764/j.issn.1672-1926.2014.05.761
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