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Well Stimulation: Steps of Acidizing Treatment

lecture 24

    Here’s a summary of acid stimulation in oil wells based on various sources:
  1. Initial Tubing Cleaning (Pickling) - 00:00
    • The process begins by cleaning the wellbore tubing using pickling. This removes solid materials that have accumulated, preventing them from entering and potentially damaging the formation.
  2. Preflush Acid Injection - 00:47
    • A preflush acid treatment is performed to remove minor organic materials and small impurities. This prepares the well, allowing the main acid treatment to focus on the primary issues.
  3. Main Acid Injection - 01:41
    • The main acid, usually hydrochloric acid, is injected to address major formation damage, particularly in carbonate formations, by dissolving materials blocking flow pathways.
  4. Postflush Injection - 02:30
    • Following the main acid, a postflush injection, often water or nitrogen, is used to clear away any by-products or precipitates from the reaction, ensuring the formation remains clear.
  5. Final Cleaning and Precaution - 03:29 to 05:09
    • Overflush is applied to displace remaining by-products from the acidizing process to prevent further formation damage. This final step ensures a clean wellbore, completing the acidizing treatment and minimizing precipitation risks.

transcript

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