Zr-Induced Thermostable Polymeric Nanospheres with Double-Cross-Linked Architectures for Oil Recovery

Abstract

For the purpose of ameliorating the temperature resistance of nanopolymer particles, a kind of hyper-crosslinked polymer, named Zr-AM/NVP/AMPS [main monomer acrylamide (AM), functional monomers N-vinylpyrrolidone (NVP), and 2-acrylamide-2-methylpropanesulfonic acid (AMPS)] with size varying from 100 to 170 nm and special doublecross-linked architectures, were prepared through inverse emulsion copolymerization of organic cross-linking agent N, Nmethylene bis acrylamide (MBA), and metal cross-linking agent zirconium acetate (Zr) as a cross-linking system, ammonium persulfate (KPS) as the initiator for the first time. The surface morphology, pore structure, particle size distribution, crosslinking architecture and element distribution of nanoparticles were fully characterized with several means including SEM, TEM, LPSA, BET, FT-IR, 13 CNMR, elemental analysis, and long-term thermal stability. The SEM, TEM, LPSA, and BET experimental results indicate that the nanopolymer particle exhibits regular spherical shape and smooth surface, has mesopores ranging from 4.9−7.1 nm with a typical diameter centered (BJH pore size distribution) at ∼5.7 nm. FT-IR, 13 CNMR, and elemental analysis experimental results indicate that the monodisperse mesoporous networks nanopolymer particles were crosslinked by AM, AMPS, NVP, MBA, and Zr. Compared to the ordinary AM/NVP/AMPS nanoparticles, significantly enhanced high-temperature thermal stability was found under 150 °C. A core displacement experiment showed how the nanopolymer particles could effectively plug the porous media for water control and oil recovery improvement even after aging at 150 °C for three months. Oil recovery is increased by 13% on the basis of water flooding. Zr-AM/NVP/AMPS nanoparticles with doublecross-linked architectures can be a great help for petroleum engineers to better apply this deep profile control and flooding technology.

Effects of residual resistance factor in the mobility control of the polymer flooding

“…Notably, hydrophobic association polymers have been tested in the Bohai oilfield. Moreover, the intermolecular interactions used to form supramolecular structure oil repellent systems consist of intermolecular complexation, chelation 44 and intermolecular encapsulation 45,46 (e.g., cyclodextrins with different alkyl species), and the research in this field has been mostly at the stage of conceptual modeling and interior research.…”

Preparation of Copolymer of Dihydroxy Monomer and Acrylamide and Its Solution Properties with Polyphenylboronic Acid Compounds

“…Although the composite system formed by polymer and organometallic cross-linking agent has the advantages of good temperature resistance and shear resistance, and long crosslinking time, but the cross-linked polymer has a great influence on the treatment of produced fluid. [3][4][5][6] Dynamic covalent bond is a reversible covalent bond. Its bond energy is lower than that of stable covalent bond, but is higher than that of non-covalent bond.…”

“…Organometallic cross‐linking agent is widely used for the second method, and the coordination bond between it and polymer could be formed. Although the composite system formed by polymer and organometallic cross‐linking agent has the advantages of good temperature resistance and shear resistance, and long cross‐linking time, but the cross‐linked polymer has a great influence on the treatment of produced fluid [3–6] …”

Intelligent sustained‐release microgel for reduced permeability of fluid channels: Synthesis and properties

“…3,4 Profile control agents have been applied in oilfields, including in-situ polymer gels, [5][6][7] particle gels 8,9 and polymer microspheres. 10,11 Microspheres have been successfully used as a deep fluid flow agent with excellent performances, 12 due to their nanometer sizes, good injection properties, and deep migration capabilities. 13,14 Moreover, microspheres have excellent dimensional and thermal stability when used as a pre-crosslinking system.…”

“…Deep profile control is needed to improve the efficiency of injection wells and the sweep coefficient of the injection development 3,4 . Profile control agents have been applied in oilfields, including in‐situ polymer gels, 5–7 particle gels 8,9 and polymer microspheres 10,11 . Microspheres have been successfully used as a deep fluid flow agent with excellent performances, 12 due to their nanometer sizes, good injection properties, and deep migration capabilities 13,14 .…”