Self-assembled microspheres feasibility study for conformance control in high temperature and high salinity reservoirs

Zou, Jirui; Yue, Xiang-an; Zhang, Junbin; Fu, Joseph; He, Jie; Kang, Bin; Ling, Qing

doi:10.1007/s12517-018-3544-0

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…[23][24][25] The polyacrylamide microspheres have good salt and temperature resistance, good suspension, adjustable particle size range, and could migrate into the reservoir deeply without losing too much to matrix adsorption. 26,27 Polyacrylamide microsphere has been widely used in the field of profile control to reduce water cut in heterogeneous reservoirs, but the temperature and salt resistance, thermal stability, mechanical strength, and plugging ability need to be further improved. Thus, the functional enhancement and modification research have become a current research hotspot.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, the polyacrylamide microspheres deep profile control technology has become a cost‐effective method to modify flow heterogeneity and enhance oil recovery from heterogeneous reservoirs 23–25 . The polyacrylamide microspheres have good salt and temperature resistance, good suspension, adjustable particle size range, and could migrate into the reservoir deeply without losing too much to matrix adsorption 26,27 …”

Section: Introductionmentioning

confidence: 99%

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Synthesis, investigation of temperature and salt resistant polyacrylamide microspheres used for deep sealing and profile control and function strengthening mechanism

Jinhua,

Siman,

Junwei

et al. 2024

J of Applied Polymer Sci

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Based on the requirements of deep sealing and profile control for the excellent temperature and salt resistance on polyacrylamide microspheres, the Poly‐AM/AMPS was prepared depends on aqueous solution polymerization method to improving oil and gas recovery efficiency in low‐permeability and heterogeneous reservoirs resulted by water channeling. The key technical parameters were established through single‐factor experimental methods, and the chemical structure was studied by infrared spectrum analysis (FTIR), energy spectrum analysis, and x‐ray diffraction analysis, and then the thermal stability was investigated depends on the thermogravimetric (TG) and differential thermogravimetric (DTG) distribution curves, moreover, the particle size and distribution, microstructure, and surface morphology were further studied. As a result, the results confirmed that the molecular structure of Poly‐AM/AMPS meets the expected design, and the quality retention rate at 800°C is 17.4%, the median particle size of Poly‐AM/AMPS particles is 35.88 μm, and the particle size distribution range is about 1.94–497.8 μm. Further, the Poly‐AM/AMPS was modified by maleic anhydride, sodium styrenesulfonate, and dimethyl diallyl ammonium chloride through conventional functional strengthening and modification, modified by nano‐SiO2, GO, and S‐CaCO3 through nano‐functional strengthening and modification. Additionally, the functional strengthening and modification mechanism was studied depends on the FTIR, TG, and DTG methods.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis, investigation of temperature and salt resistant polyacrylamide microspheres used for deep sealing and profile control and function strengthening mechanism

Jinhua,

Siman,

Junwei

et al. 2024

J of Applied Polymer Sci

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“…The injection of CSA particles, which are significantly smaller than the target pore throat diameter, can not only successfully enter the deep porous medium, but also effectively block the high-permeability region by forming self-aggregating particle clusters. Zou et al [ 20 ] synthesized self-assembled microspheres from DCA (divinylbenzene-co-acrylamide), and Shi et al [ 21 ] conducted a subsequent investigation on the mechanism of plug formation and migration of DCA microspheres. These microspheres are capable of forming clusters in high-temperature and high-salinity oil–water environments.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Preformed Submicron Crosslinked Polymer Coils for Conformance Control in Low-Permeability Reservoirs

Liu,

Peng

2023

Polymers

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With the increasing development of low-permeability reservoirs, the significance of conformance control treatment has risen considerably. To address the conflict between injectability and plugging performance, as well as to enhance the deep migration capacity of conformance control agents, preformed submicron crosslinked polymer coils (SCPCs) have been manufactured using aqueous solution dispersion polymerization. Fourier transform infrared and scanning electron microscopy were employed to examine the chemical structure and micromorphology, while particle size distribution, zeta potential, rheological, and filtration properties were analyzed. The effectiveness of conformance control was confirmed through the parallel core displacement. The effective particle size of SCPCs was at a submicron level (500~800 nm). SCPCs exhibit a transitional threshold concentration between gel and sol states (0.25 wt%~0.5 wt%). SCPCs can efficiently block the 1.2 μm microporous filter membrane. The filtration time is up to 67.8 min. SCPCs can improve the water absorption rate of lower permeability cores from 21.21% to 57.89% with a permeability difference of 5. Therefore, SCPCs have good injectability, plugging performance, and deep migration capacity and can be used for conformance control in low-permeability reservoirs.

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“…Recently, the polyacrylamide-based nano–microspheres emulsion as a new kind of depth profile control agent, with controllable particle size, strong migration ability, good swelling performance, low cost, and good injection performance, has achieved preliminary effects in enhanced oil recovery (EOR), especially for some low-permeability reservoirs. − To better match the permeability, pore throat size, formation water temperature, and salinity of the applied rock formation, the researchers mainly studied the size of the nano–microspheres, the temperature and salt resistance of the copolymer component, the swelling capacity, the gel strength, and the plugging performance of the simulated core. In recent decades, researchers prepared a series of micron-scale polymer microspheres from increasing the plugging strength for pore throat.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Temperature-Sensitive P(NIPAM-AM) Nano–Microspheres in Enhanced Oil Recovery

Zhou

Luo

et al. 2022

Energy Fuels

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As a new kind of water plugging and profile control agents, the polyacrylamide nano−microspheres have been experimentally applied and achieved satisfactory preliminary results in enhanced oil recovery, especially for low-permeability reservoirs. However, the larger swollen particle size and excessive hydrophilicity limit the effect at the oil−water interface. In order to further improve their profile control and flooding effect, the temperature-sensitive poly(N-isopropylacrylamide-acrylamide) nano−microspheres are prepared by inverse microemulsion polymerization. Based on the principle of conformation transition of PNIPAM triggered by simulated high temperature in reservoirs, the particle size and hydrophilicity of the microspheres are reduced, making it easier to reach the oil−water interface, reduce the oil−water interface tension, and enhance the structural disjoining pressure, which improves the spontaneous emulsification effect and removal effect of residual oil on rocks. The swelling properties, hydrophilicity, interfacial activity, and oil displacement properties of the nano−microspheres were also analyzed. The results show that the swelling ratio of the copolymerized nano−microspheres decreases to 1.5. At simulated reservoir temperature (65 °C), the water contact angle of copolymerized gel increases from 43 to 86°, indicating that its hydrophilicity decreases and shows a clear tendency to migrate to the water−oil interface. At 65 °C, 0.1 wt % PNIPAM-based microsphere emulsion (N3) reduces the oil−water interfacial tension from 17.8 to 0.9 mN m −1 . The microscopic oil displacement experiment shows that the recovery efficiency of our designed temperature-sensitive nano−microspheres emulsion is increased by 7%, which is higher than that of the PAM polymer nanosphere. The PNIPAM-based temperature-sensitive nano−microspheres that can function at the oil−water interface have a potential development prospect in low-permeability reservoirs.

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Self-assembled microspheres feasibility study for conformance control in high temperature and high salinity reservoirs

Cited by 9 publications

References 29 publications

Synthesis, investigation of temperature and salt resistant polyacrylamide microspheres used for deep sealing and profile control and function strengthening mechanism

Synthesis, investigation of temperature and salt resistant polyacrylamide microspheres used for deep sealing and profile control and function strengthening mechanism

Preparation of Preformed Submicron Crosslinked Polymer Coils for Conformance Control in Low-Permeability Reservoirs

Preparation and Properties of Temperature-Sensitive P(NIPAM-AM) Nano–Microspheres in Enhanced Oil Recovery

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