Impacts of crosslinker concentration on nanogel properties and enhanced oil recovery capability

Ding, Hongwei; Geng, Jiaming; Lu, Yuanhang; Zhao, Yang; Bai, Baojun

doi:10.1016/j.fuel.2020.117098

Cited by 21 publications

(6 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rheological properties of 3D printing inks are crucial for the success of the process. They affect the printability, performance, and results of the print [47,48].…”

Section: Rheology Of the Gel Solutionsmentioning

confidence: 99%

Additive-Free Gelatine-Based Devices for Chondral Tissue Regeneration: Shaping Process Comparison among Mould Casting and Three-Dimensional Printing

et al. 2022

View full text Add to dashboard Cite

Gelatine is a well-known and extensively studied biopolymer, widely used in recent decades to create biomaterials in many different ways, exploiting its molecular resemblance with collagen, the main constituent of the extra-cellular matrix, from which it is derived. Many have employed this biopolymer in tissue engineering and chemically modified (e.g., gelatin methacryloyl) or blended it with other polymers (e.g., alginate) to modulate or increase its performances and printability. Nevertheless, little is reported about its use as a stand-alone material. Moreover, despite the fact that multiple works have been reported on the realization of mould-casted and three-dimensional printed scaffolds in tissue engineering, a clear comparison among these two shaping processes, towards a comparable workflow starting from the same material, has never been published. Herein, we report the use of gelatine as stand-alone material, not modified, blended, or admixed to be processed or crosslinked, for the realization of suitable scaffolds for tissue engineering, towards the two previously mentioned shaping processes. To make the comparison reliable, the same pre-process (e.g., the gelatin solution preparation) and post-process (e.g., freeze-drying and crosslinking) steps were applied. In this study, gelatine solution was firstly rheologically characterized to find a formulation suitable for being processed with both the shaping processes selected. The realized scaffolds were then morphologically, phisico-chemically, mechanically, and biologically characterized to determine and compare their performances. Despite the fact that the same starting material was employed, as well as the same pre- and post-process steps, the two groups resulted, for most aspects, in diametrically opposed characteristics. The mould-casted scaffolds that resulted were characterized by small, little-interconnected, and random porosity, high resistance to compression and slow cell colonization, while the three-dimensional printed scaffolds displayed big, well-interconnected, and geometrically defined porosity, high elasticity and recover ability after compression, as well as fast and deep cell colonization.

show abstract

“…The rheological properties of 3D printing inks are crucial for the success of the process. They affect the printability, performance, and results of the print [47,48].…”

Section: Rheology Of the Gel Solutionsmentioning

confidence: 99%

Additive-Free Gelatine-Based Devices for Chondral Tissue Regeneration: Shaping Process Comparison among Mould Casting and Three-Dimensional Printing

et al. 2022

View full text Add to dashboard Cite

show abstract

“…To match the pore throat with a smaller size, a variety of functionalized PAM-based nano–microspheres were developed for oil recovery. For example, P(AA-AM) nano–microspheres with a diameter of 100 nm were prepared by adding more surfactants, span80, and Tween60 . P(AAM-AMPS) nano–microspheres enhanced resistances to temperature and salt environment by introducing poly(2-acrylamido-2-methylpropane sulfonic acid) .…”

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

View full text Add to dashboard Cite

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.

show abstract

“…PPGs were synthesized at surface facilities and overcame the drawbacks that existed in CPGs. After injected into the formation, PPGs could go deep into the formation by elastic deformation and block the high permeability area of the reservoir after absorbing water and swelling. − So far, some types of PPGs have been developed. For example, Zhou et al synthesized an acid-resistant PPG system by the radical polymerization of acrylamide (AM), N , N ′-methylene bisacrylamide (MBA), and dimethyldiallylammonium chloride, and this PPG system exhibited good water absorbency and viscoelastic properties under acidic conditions for conformance control .…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Novel Nanocomposite Particle Gel for Water Shutoff Treatment in Mature Oilfields

et al. 2022

View full text Add to dashboard Cite

Conventional preformed particle gels suffer from insufficient salt tolerance and weak mechanical properties after water absorption, which reduce the water shutoff effect in mature oilfields. In this paper, a nanocomposite particle gel (NCPG) is synthesized by copolymerization of acrylamide (AM) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) using laponite RD (LPT) as a physical cross-linker and N,N-methylene-bisacrylamide (MBA) as a chemical cross-linker via in situ free radical polymerization. Compared with the NCPG without LPT, both the swelling rate and mechanical properties of NCPG added with LPT are found to be improved. In addition, the pore sizes of the network of the swollen NCPG are smaller than those of the sample without LPT, and the thermal stability is also slightly enhanced. The swelling rate of NCPG increases with increasing AMPS concentration. The water absorbency of NCPG first increases and then decreases with increasing MBA and APS concentrations. The NCPG is sensitive to alkaline medium due to the presence of sulfonic acid groups on the molecular chains of the NCPG. The synthesized NCPG exhibits good salt tolerance at 80 °C in formation water. The plugging rate of the NCPG to a sand-pack is above 90%, and the residual resistance factor reaches 19.2 under reservoir conditions. These results indicate that the NCPG may have potential application for water shutoff treatment in mature oilfields.

show abstract

Impacts of crosslinker concentration on nanogel properties and enhanced oil recovery capability

Cited by 21 publications

References 29 publications

Additive-Free Gelatine-Based Devices for Chondral Tissue Regeneration: Shaping Process Comparison among Mould Casting and Three-Dimensional Printing

Additive-Free Gelatine-Based Devices for Chondral Tissue Regeneration: Shaping Process Comparison among Mould Casting and Three-Dimensional Printing

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

Experimental Investigation of a Novel Nanocomposite Particle Gel for Water Shutoff Treatment in Mature Oilfields

Contact Info

Product

Resources

About