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An Integrated Experimental Method for Investigating Sequential Injection Acidizing in Carbonate Formation.

Da Wang1,2,3, Puyong Feng2,3, Bo Zhang2,3

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Sequential injection acidizing enhances deep acid penetration in high-temperature reservoirs by creating unique wormhole structures. This method uses less acid and lower pressure for improved efficiency compared to conventional techniques.

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Area of Science:

  • Petroleum Engineering
  • Reservoir Stimulation
  • Acidizing Techniques

Background:

  • Sequential injection acidizing is used for acid diversion and deep penetration in high-temperature reservoirs.
  • Limited research exists on its impact on wormhole development.

Purpose of the Study:

  • Investigate the mechanisms of sequential injection acidizing, focusing on wormhole development.
  • Evaluate its effectiveness in high-temperature carbonate formations.

Main Methods:

  • Integrated experimental approach: fluid performance evaluation, core flooding, and computerized tomography (CT) imaging.
  • Selection of acid combinations and performance investigation in carbonate reservoirs.

Main Results:

  • Sequential injection acidizing requires less acid and lower pressure drop for deeper core penetration than single-stage stimulation.
  • CT imaging revealed enhanced wormhole randomness and formation of dispersed, interconnected large dissolution pores.
  • This technique improves acidizing efficiency, especially in high-temperature reservoirs.

Conclusions:

  • Sequential injection acidizing offers synergistic benefits for carbonate reservoirs, particularly at high temperatures.
  • Provides insights for designing and selecting acid stages for improved wormhole penetration.
  • Suggests further experiments with more acid stages using the integrated method.