西南石油大学学报(自然科学版)

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Study and Application of Intelligent Integrated Acid System for#br# Sandstone Stimulation

Liu Pingli1*, Sun Geng2, Xing Xijin3, Pan Yiyong4, Zhao Liqiang1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. No.3 Oil Production Plant Northwest Oilfield Branch,SINOPEC,Kuqa,Xinjiang 841000,China
    3. CNOOC Research Institute,Chaoyang,Beijing 100028,China
    4. Tianjin Branch,CNOOC(China)Co. Ltd.,Tanggu,Tianjin 300450,China
  • Online:2015-12-01 Published:2015-12-01

Abstract:

By use of preflush,treating fluid,over-flush and diverter,conventional sandstone acidizing treatment could effectively
break down formation and prevent the secondary precipitation,which is very complicated. To overcome the shortage of
conventional sandstone acidizing,InteAcid is developed. Through the use of InteAcid,single-step acidizing can be realized,
instead of using conventional sandstone acidizing. Single-step acidizing could significantly simplify the acidizing stimulation
process,which can be widely used for offshore well acidizing. The experimental data shows that InteAcid could not only
dissolve sandstone mineral and remove well damage effectively,but also prevent secondary precipitation excellently,especially
for metal fluoride precipitation(the inhibition ratio is 71.81%),fluosilicate/aluminate precipitation(the inhibition ratio is
70.51%)and metal hydroxides(the inhibition ratio is 78.59%). After treated by single-step acidizing,the original permeability
of non-damage core,slight-damage core and severe-damage core have been improved to 1.35times,3.6 times and 15 times
respectively. The micro pore structure analysis result shows that InteAcid can stabilize clay and almost never damage the rock
structure while improving the core permeability. 11 in-situ injection well have been stimulated by single-step acidizing. The
success rate is 100% and 90 percent of these wells have been improved obviously,of which the injection index is increased
largely and the pressure declines notably.

Key words: intelligence aciding, single step, secondary precipitation, chelating

CLC Number: