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Citation: ZHAO Ren-Bao, YUE Xiang-An, HOU Ji-Rui, ZHAO Gen, XU Run-Xuan. The Corrosion inhibition Behavior of Microemulsified Acid and Its Acidizing Effect in Core[J]. Chinese Journal of Applied Chemistry, ;2006, 23(2): 149-152. shu

The Corrosion inhibition Behavior of Microemulsified Acid and Its Acidizing Effect in Core

1.
Enhanced Oil Recovery Research Center, University of Petroleum, Beijing 102249

Corresponding author: YUE Xiang-An,
Received Date: 20 April 2005
Available Online: 8 August 2005
Fund Project: 国家十五科技攻关项目(2003BA613A-07-05) (2003BA613A-07-05)

Experiments were conducted in an O/W microemulsified acid system with a wide salinity tolerance range(0~120 g/L).For comparison,the chemical reactions of the N80 steel and the sand particles in two acid systems,including mud acid and microemulsified acid,were studied.The different characteristics of the chemical reactions in unconsolidated sand packs of the two acid systems were observed as well as their acidizing effects in cores.After microemulsification of the mud acid,its corrosion rates to the N80 steel and the sand particles were found to decrease by 45% and 40% respectively compared with that of mud acid,and lower loss rates in unconsolidated sand packs were observed.In an unconsolidated sand pack with a length of 50 cm,when injected at a rate of 0.5 mL/min for 60 min,the mud acid reacted at the distance of 0~20 cm,and the microemulsified acid at the 13~50 cm.In core flooding,the end face near the outlet became loose with microemulsified acid;however,the inlet end face became loose with mud acid.Because of the excellent corrosion inhibition performance after emulsification,the microemulsified mud acid system can flow to reservoir' deep parts and be reliably applied to indepth reservoir acidizing.
- mud acid,
- microemulsified acid,
- reservoir,
- corrosion inhibition,
- unconsolidated sand pack,
- core
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