西南石油大学学报(自然科学版) ›› 2000, Vol. 22 ›› Issue (2): 67-69.DOI: 10.3863/j.issn.1000-2634.2000.02.21

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

DESIGN OF ACIDIZING FLUID FORMULA ON RE-TARDING ACIDIZING TREATMENT IN SANDSTONE

HUANG Zhi-yu1 HE Yan1 JI Shu-mei1   

  1. Southwest Petroleum Inst
  • Received:1999-10-15 Revised:1900-01-01 Online:2000-04-20 Published:2000-04-20

Abstract:

A retarded acid system has been presented which can be used in sandstone formation. It consists of an organic acid and its ammonium salt, a phosphoric acid and an ammonium fluoride. Results have showed that this acidizing fluid has low reaction rate when reacting with quartz sand, carbonates and clay minerals compared with mud acid. It has good retarding effects especially in sandstone formation where high clay content exists. In addition, the framework of sandstone has not been destroyed after treatment and some metallic ion such as Fe3+ and Al3+ can be tied up so that the secondary precipitation will not occur.

Key words: acidizing, retarded acid, sandstone, stimulation, formation damage

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