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
Petroleum Engineering Technology Research Institute, Sinopec Southwest Oil & Gas Company, Deyang, China
Contribution: Conceptualization (lead), Funding acquisition (lead)
Search for more papers by this authorZeyu Xue
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Contribution: Data curation (lead), Formal analysis (lead)
Search for more papers by this authorLianci Wu
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Contribution: Resources (lead), Writing - original draft (lead)
Search for more papers by this authorYumei Luo
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Contribution: Visualization (lead)
Search for more papers by this authorCorresponding Author
Xiaodong Bai
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Correspondence:
Xiaodong Bai ([email protected])
Contribution: Investigation (equal)
Search for more papers by this authorYancheng Yan
Petroleum Engineering Technology Research Institute, Sinopec Southwest Oil & Gas Company, Deyang, China
Contribution: Conceptualization (lead), Funding acquisition (lead)
Search for more papers by this authorZeyu Xue
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Contribution: Data curation (lead), Formal analysis (lead)
Search for more papers by this authorLianci Wu
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Contribution: Resources (lead), Writing - original draft (lead)
Search for more papers by this authorYumei Luo
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Contribution: Visualization (lead)
Search for more papers by this authorCorresponding Author
Xiaodong Bai
School of New Energy and Materials, Southwest Petroleum University, Chengdu, China
Correspondence:
Xiaodong Bai ([email protected])
Contribution: Investigation (equal)
Search for more papers by this authorFunding: 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.
Open Research
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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