Volume 142, Issue 15 e56733
RESEARCH ARTICLE

Synthesis and Application of a Temperature Sensitive Poly(Acrylamide-Co-N-Isopropylacrylamide-Co-Sodium P-Styrene Sulfonate) as a New Water-Based Drilling Fluid Plugging Agent

Yancheng Yan

Yancheng Yan

Petroleum Engineering Technology Research Institute, Sinopec Southwest Oil & Gas Company, Deyang, China

Contribution: Conceptualization (lead), Funding acquisition (lead)

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Zeyu Xue

Zeyu Xue

School of New Energy and Materials, Southwest Petroleum University, Chengdu, China

Contribution: Data curation (lead), Formal analysis (lead)

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Lianci Wu

Lianci Wu

School of New Energy and Materials, Southwest Petroleum University, Chengdu, China

Contribution: Resources (lead), Writing - original draft (lead)

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Yumei Luo

Yumei Luo

School of New Energy and Materials, Southwest Petroleum University, Chengdu, China

Contribution: Visualization (lead)

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Xiaodong Bai

Corresponding Author

Xiaodong Bai

School of New Energy and Materials, Southwest Petroleum University, Chengdu, China

Correspondence:

Xiaodong Bai ([email protected])

Contribution: ​Investigation (equal)

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First published: 19 January 2025
Citations: 1

Funding: This work was supported by National Natural Science Foundation of China, 51104122.

ABSTRACT

In the process of oil and gas production, the failure of drilling fluid caused it to invade the formation, leading to wellbore instability. N-isopropylacrylamide (NIPAM), acrylamide (AM), and sodium p-styrene sulfonate (SSS) were used as raw materials, and the P(NIPAM/AM/SSS) (abbreviated as NAS) temperature-sensitive plugging agent was synthesized by inverse emulsion polymerization. The optimum synthesis conditions were obtained using a redox initiation system. Infrared measurements and UV–visible analysis showed that the target product was successfully prepared, and NAS exhibited a lower critical solution temperature (LCST) of 55°C, with sensitive temperature-responsive behavior. Rheological and filtration tests, along with high-temperature and high-pressure (HTHP) sand tray tests, demonstrated that the temperature-sensitive plugging agent effectively plugged the formation. Particle size analysis and Zeta potential analysis indicated that the addition of the temperature-sensitive plugging agent increased the electrostatic stability of bentonite-based slurry and polymer. Contact angle measurements and micro-morphology of the mud cake revealed that a hydrophilic-hydrophobic transition occurred at high temperatures in NAS, forming a dense hydrophobic film on the surface of the mud cake. This film effectively sealed cracks and micropores, reduced the invasion of free water, and improved wellbore stability.

Conflicts of Interest

The authors declare no conflicts of interest.

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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