STUDY ON CHEMICAL EQUILIBRIUM IN SANDSTONE MATRIX ACIDIZING

doi:10.3863/j.issn.1000-2634.2000.02.19

西南石油大学学报(自然科学版) ›› 2000, Vol. 22 ›› Issue (2): 57-61.DOI: 10.3863/j.issn.1000-2634.2000.02.19

• 油气化学工程与化工 • Previous Articles Next Articles

STUDY ON CHEMICAL EQUILIBRIUM IN SANDSTONE MATRIX ACIDIZING

WANG Bao-feng¹ZHAO Zhong-yang¹ XUE Fang-yu²

Fracturing and Acidizing Technical Ser-vice Center Langfang Branch Institute of Petroleum E.& D.CNPC

Received:1999-10-12 Revised:1900-01-01 Online:2000-04-20 Published:2000-04-20

Abstract

Abstract:

It is identified that hydrochloric acid can increase the secondary reaction of H2SiF6 with alumino-silicates by testing Kaolinite powder and oilfield sandstone core displacement test.There is a chemical equilibrium among H₂SiF₆-AlF_x^(3-x)+ -HCl which can be used to control the stoichiometric of primary and secondary reaction of HF with alumino-silicates during sandstone matrix acidizing. Results have revealed that HCl can not only dissolve carbonate minerals in the reservoir but also control the equilibrium between aluminum and silicon fluoride in mud acid treatments. The higher the concentration of HCl, the lower F/Al ratio, and the less the secondary damage by acidizing.

Key words: nuclear magnetic resonance, spectrometer, matrix acidizing, chemical equilibrium, sandstone

CLC Number:

TE357.2

WANG Bao-feng ZHAO Zhong-yang XUE Fang-yu . STUDY ON CHEMICAL EQUILIBRIUM IN SANDSTONE MATRIX ACIDIZING[J]. 西南石油大学学报(自然科学版), 2000, 22(2): 57-61.

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STUDY ON CHEMICAL EQUILIBRIUM IN SANDSTONE MATRIX ACIDIZING

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