Volume 43 Issue 5
Oct.  2026
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Li Mingxuan, Yao Yiming, Chen Chen, et al.Synthesis and performance evaluation of a high-temperature resistant long-acting self-generated acid fluid system[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：702-710 doi: 10.12358/j.issn.1001-5620.2026.05.015
Citation: Li Mingxuan, Yao Yiming, Chen Chen, et al.Synthesis and performance evaluation of a high-temperature resistant long-acting self-generated acid fluid system[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：702-710 doi: 10.12358/j.issn.1001-5620.2026.05.015
shu

Synthesis and Performance Evaluation of a High-Temperature Resistant Long-Acting Self-Generated Acid Fluid System

doi: 10.12358/j.issn.1001-5620.2026.05.015
  • 1.

    Sinopec Petroleum Engineering Technology Research Institute Co., Ltd., Beijing ‌102206‌

  • 2.

    Sinopec Key Laboratory of Shale Oil & Gas Drilling and Completion, Beijing ‌102206‌

  • Received Date: 2026-02-09
  • Accepted Date: 2026-03-22
  • Rev Recd Date: 2026-03-11
  • Publish Date: 2026-10-01
    Abstract
  • In response to the challenges in acidizing deep high-temperature carbonate reservoirs, where conventional acids react too rapidly and existing self-generated acids suffer from insufficient acid-generated capacity and poor temperature resistance, this study developed a novel high-temperature resistant acid-generated agent, SFACA, and constructed a high-temperature long-lasting self-generated acid system based on it. Experimental results demonstrate that SFACA operates via an efficient "activation-hydrolysis-dissociation-cyclic catalysis" acid generation mechanism, capable of continuously releasing hydrogen ions within the temperature range of 60～180 ℃. Its acid generation activity is effectively activated above 140 ℃, achieving an effective hydrogen ion concentration of up to 7.8 mol·kg−1. Furthermore, the acid concentration can be flexibly regulated by optimizing the agent-to-water mass ratio. The self-generated acid system constructed based on SFACA exhibits good compatibility and demonstrates efficient dissolution capability toward the primary mineral of carbonate rocks, CaCO3. The effective acid-rock reaction durations at 160 ℃ and 180 ℃ are 7 h and 4 h, respectively, with corresponding acid-rock reaction rates of 1.45×10−7 mol·cm−2·s−1 and 2.46×10−7 mol·cm−2·s−1, highlighting its long-lasting performance characteristics. Additionally, the system exhibits good corrosion inhibition, with dynamic corrosion rates on N80 steel coupons measured at 56.3 g·m−2·h−1 and 67.8 g·m−2·h−1 at 160 ℃ and 180 ℃, respectively. The high-temperature long-lasting self-generated acid system achieves high acidity, sustained release, and efficient etching under high-temperature conditions, providing reliable technical support for the efficient stimulation of deep high-temperature carbonate reservoirs at 160～180 ℃ range.

     

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