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<p>Clay stabilizers are essential for inhibiting clay mineral swelling and migration. Given the shortage that polycationic clay stabilizers may block pores in tight reservoirs, a degradable polycationic clay stabilizer (ACS) was developed in this work. It can gradually hydrolyze at formation temperature, and produce hydrogen ions, showing the characteristics of acid. The ACS was synthesized by N, N, N’, N’- Tetramethyl ethylenediamine and Chloroacetic anhydride. Experiments of anti-swelling, swelling-restoration, hydrolysis, and dissolution at temperatures from 30 to 100°C were carried out. A maximum anti-swelling rate of 87.04% was achieved at 3% concentration. The swelling-restoration rate at ambient temperature was 20.69% under the experimental conditions. The ACS slowly hydrolyzes into a low-molecular-weight stabilizer and release hydrogen ions as temperature increases. Moreover, hydrolysis is intensified with the increase in temperature. At 95°C, the dissolution rate of limestone can reach 27.23% when the concentration of ACS is 3%. These performances make ACS play the role of polycationic clay stabilizer in hydraulic fracturing construction, and automatically degrade after hydraulic fracturing. And it has a certain dissolution performance. This not only avoided the problem that the adsorption of polycationic clay stabilizer occupies pore space, but also can improve pore space to some extent.</p>

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Preparation and Performance Evaluation of Acidic Clay Stabilizer

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Xiaojiang Yang,
  • Junxian Yang,
  • Qiang Gao,
  • Yao Zheng,
  • Fei Wang,
  • Yonghao Chen,
  • Dong Wang,
  • Hao Zeng,
  • Jian Li

摘要

Clay stabilizers are essential for inhibiting clay mineral swelling and migration. Given the shortage that polycationic clay stabilizers may block pores in tight reservoirs, a degradable polycationic clay stabilizer (ACS) was developed in this work. It can gradually hydrolyze at formation temperature, and produce hydrogen ions, showing the characteristics of acid. The ACS was synthesized by N, N, N’, N’- Tetramethyl ethylenediamine and Chloroacetic anhydride. Experiments of anti-swelling, swelling-restoration, hydrolysis, and dissolution at temperatures from 30 to 100°C were carried out. A maximum anti-swelling rate of 87.04% was achieved at 3% concentration. The swelling-restoration rate at ambient temperature was 20.69% under the experimental conditions. The ACS slowly hydrolyzes into a low-molecular-weight stabilizer and release hydrogen ions as temperature increases. Moreover, hydrolysis is intensified with the increase in temperature. At 95°C, the dissolution rate of limestone can reach 27.23% when the concentration of ACS is 3%. These performances make ACS play the role of polycationic clay stabilizer in hydraulic fracturing construction, and automatically degrade after hydraulic fracturing. And it has a certain dissolution performance. This not only avoided the problem that the adsorption of polycationic clay stabilizer occupies pore space, but also can improve pore space to some extent.