EXPERIMENTAL STUDY ON MONTMORILLONITE REACTION IN ACIDIZATION SYSTEM
Received date: 2007-04-11
Revised date: 2007-06-05
Online published: 2007-08-10
Under 60℃ circumstance, with X'Pert PRO X Ray, Spectrometry Electron Microscope, Scanning Spectrometer and so on, the concentration changing law of main ions is systematically investigated in the residual acids after montmorillonite mineral, whose content is over 98%, reacts with HF, HF/HCl, HCl/HBF4. Solid phase transformation, characteristics of particle fabric, and factors of affecting the transformation etc have also been researched. The experiment results indicate: acids have capability to dissolve Al element of montmorillonite crystal initially. HF/mud acid reacts with montmorillonite at a very fast rate, showing fast and intensive dissolution characteristics. In the reaction less than 2 hours, 8% HBF4 system turns into weak acid and the main ions content is only 1/2 to 1/3 of that in HF or mud acid; after 2 hours, HBF4 system has identical dissolving endurance of montmorillonite; with Spectrometry Electron Microscope, complicated scale has been found, which is likely to damage reservoir bed.
Key words: Acidification; Montmorillonite; Dissolution; Scale; Damage.
YAN Rong-hui, TANG Hong-ming, LI Gao, LU Shu-xiu . EXPERIMENTAL STUDY ON MONTMORILLONITE REACTION IN ACIDIZATION SYSTEM[J]. Natural Gas Geoscience, 2007 , 18(4) : 626 -628 . DOI: 10.11764/j.issn.1672-1926.2007.04.626
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