A nano‐Fe₃O₄ material coated with AM/AMPS copolymer for viscosity enhancement at harsh reservoir conditions

Abstract

A Fe 3 O 4 nonaparticles coated with acrylamide/2-acrylamido-2-methyl-1-propanesulfonic acid copolymer(Fe 3 O 4-Polymer NPs) was synthesized by emulsion polymerization. The structure of Fe 3 O 4-Polymer NPs was then characterized by infrared spectroscopy, thermo-gravimetric analysis, and scanning electron microscopy. Meanwhile, the rheological properties of Fe 3 O 4-Polymer NPs solution were systematically studied. The results showed that when dosage of hydrophobic Fe 3 O 4-Oleic NPs is 10%, the synthesized Fe 3 O 4-Polymer NPs was with the best viscosity enhancement performance, and the maximum saturation magnetization could reach to 20.0 emu/g. The apparent viscosity value of 5000 mg/L magnetic nano-composite solution was 154.6 mPaÁs at 30 C. It shows strong viscosity enhancement ability and good temperature performance. Hence, it has great application potential in well stimulation of medium and high temperature oil and gas reservoirs.

Synthesis and evaluation of magnetite nanoparticles coated with (acrylamide-vinylpyrrolidone) polymers on the thermostability for application in harsh offshore reservoirs

“…In contrast, the absorption peak at 1650-1600 cm -1 , corresponding to olefinic stretching in acrylamide and N-vinylpyrrolidone units, disappeared in the PCM spectrum. These disappearances prove that the monomers have been completely consumed following the reaction [21]. Thus, the FTIR spectrum exhibited all the component signals in the structure of the Fe 3 O 4 -core/(AM-NVP) copolymer-shell NPs.…”

“…The process of polymerisation of oleic-acid-surface modified nano-oxide cores with acrylamide (AM) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) monomers has been described in detail [20,21], where the polymers were grafted onto the particle surface by polymerising vinyl monomers with the vinyl linkage of oleic acid. The obtained results showed that (AM-AMPS) copolymer coated NP-based nanofluids affected the EOR capacity, such as a viscosity enhancement, increase in the displacement efficiency, thermal stability, and salt resistance at 90 °C.…”

“…After 1, 3, 7, 14, 21, and 31 days, the appearance of dispersions was observed, and their viscosity was measured. 4(Ab)), the characteristic absorption peaks of MNPs at 600-500 cm -1 can be attributed to Fe-O bonds [21]. In the curve of OA (figure 4(Aa)) and ONM (figure 4(Ab)), the absorption peaks at 1700-1500 cm -1 are related to C=C stretching, while those at 2900-2800 cm -1 correspond to the Csp 3 -H (-CH 2 ) stretching vibration [21].…”

“…4(Ab)), the characteristic absorption peaks of MNPs at 600-500 cm -1 can be attributed to Fe-O bonds [21]. In the curve of OA (figure 4(Aa)) and ONM (figure 4(Ab)), the absorption peaks at 1700-1500 cm -1 are related to C=C stretching, while those at 2900-2800 cm -1 correspond to the Csp 3 -H (-CH 2 ) stretching vibration [21]. Furthermore, the signal of C=O of OA overlapped with C=C stretching at 1700-1550 cm -1 .…”

Review on High-Temperature-Resistant Viscoelastic Surfactant Fracturing Fluids: State-of-the-Art and Perspectives

“…Nanotechnology, as a cutting-edge technology, has great potential in drilling and completion, ,− reservoir stimulation, ,− enhanced oil recovery, ,− and other oilfield operations. Nanoparticles are ultrafine (1–100 nm), − usually larger than atomic clusters, but smaller than ordinary particles.…”