Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media

Bai, Yingrui; Li, Junjian; Xiong, Chao; Shang, Xiaosen; Fang, Wei; Zhang, Miao

doi:10.1002/app.43447

Cited by 6 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the hydrogel cross-linked by the metallic cross-linker, such as Cr 3+ and Al 3+ , has poor temperature-resistant and salt-resistant properties. , As a result, the organic cross-linking agent, such as formaldehyde and phenol, has been employed to prepare the hydrogel used in high-temperature conditions. Moradi-Araghi et al reported a stable phenol–formaldehyde gel, which survived over 9 months at 149 °C in seawater containing 3.4% total dissolved solids (TDS) and 1700 mg/L hardness.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Nanosilica-Reinforcing Polyacrylamide/Polyethylenimine Hydrogel for Water Shutoff Treatment

Chen

Wang

et al. 2018

Energy Fuels

View full text Add to dashboard Cite

Polyacrylamide hydrogel used in conformance control is subjected to poor stability at an elevated temperature. In this paper, nanosilica has been found to be a very effective stabilizing agent for the polyacrylamide/polyethylenimine hydrogel, and the reinforcing performance of nanosilica on the hydrogel was investigated in detail. The result showed that the strength of hydrogel is enhanced obviously by the nanosilica, and the hydrogel syneresis is also significantly inhibited by the nanosilica, which can increase the hydrogel stability time from 18 to 180 days at 130 °C. Besides, nanosilica can increase the shear viscosity and hydrodynamic radius of polyacrylamide, and the bound water in the hydrogel is also grown in the presence of nanosilica. In comparison to the micromorphology of common hydrogel, the dense and strong mesh structure is formed as a result of the reinforcing behavior of nanosilica. According to the above results, it is inferred that the silanol group of nanosilica cross-links with the amidogen of polyacrylamide via the hydrogen bond, which is considered as the primary cause of the reinforcing performance of nanosilica for the hydrogel. In addition, as a result of the improving strength and stability and increasing absorption of the polymer to rock surface, the hydrogel enhanced by nanosilica has a higher water shutoff ratio and residual resistance factor and a longer period of validity.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Nanosilica-Reinforcing Polyacrylamide/Polyethylenimine Hydrogel for Water Shutoff Treatment

Chen

Wang

et al. 2018

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The models are implemented by finite element numerical simulation. Core #1 is the fractured core created by cutting through the middle of a core sample, − and core #2 is the fractured core with a fracture in the middle and leakoff pots in the side faces . Core #3 is the fractured core used in this work, in which there is a fracture of fixed width in the middle of the fractured core with two fluid leakoff channels perpendicular to the fracture direction, which allows the fluid to flow away from the matrix.…”

Section: Methodsmentioning

confidence: 99%

“…Schematic diagram of different fractured models − and numerical simulation of different models. The basic numerical model is a 2D matrix with a fracture in the middle.…”

Section: Methodsmentioning

confidence: 99%

Interplay between Viscous Pressure and Capillary Pressure on Polymer Gel Dehydration and Water Shutoff in Hydraulically Fractured Reservoirs

Liang

et al. 2020

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Hydraulic fracturing is essential for efficient developments of low-permeability reservoirs. For these fractured production wells, serious water channeling frequently occurs because of the fracture connections to injectors or underlying/lateral aquifers. To address the problem, the preformed gel treatment is typically adopted. One of the key mechanisms for the treatment is gel dehydration, which has however not been well understood. This study presents a lab experimental study of the mechanisms of gel dehydration and its impact on water shutoff performance. We carried out both sand pack and fractured core tests to comprehensively study how capillary pressure and viscous pressure induce gel dehydration. Results show that viscous-pressure-induced dehydration greatly enhances water shutoff performance through forming a concentrated gel cake with a width less than 3 mm, whereas capillary force acts oppositely and reduces the bonding between gel and fracture surfaces. Specifically, viscous pressure dominates the early stage of gel dehydration and capillary force takes over in the later stage while the influence of viscous pressure fades away due to the formation of the gel cake. Increasing the viscous pressure can effectively offset the damage caused by capillary pressure, which favors gel dehydration and thereby improves water shutoff performance. This work, to our best knowledge, is the first that particularly provides insight into the synergistic mechanism of capillary force and viscous force dehydrating a polymer gel. The overall work enhances our understanding of the interplay of viscous and capillary pressures on gel dehydration and its fracture shutoff performance. It provides a theoretical basis for designing gel injection strategies during field treatment in fractured reservoirs.

show abstract

“…More than half of the hydrocarbon production in the world is contributed by fracture-vuggy carbonate reservoirs [4,5]. Tahe Oilfield, located in the Tarim Basin, western China, is a typical fracture-vuggy carbonate reservoir (billion tons-level) [6,7]. The recovered oil production has exceeded 0.5 billion tons since its exploitation from 1997.…”

Section: Introductionmentioning

confidence: 99%

Study on Fluid Behaviors of Foam-Assisted Nitrogen Flooding on a Three-Dimensional Visualized Fracture–Vuggy Model

Liang

Hou

2021

Applied Sciences

View full text Add to dashboard Cite

Tahe Oilfield, located in northwest China, is an unconventional fracture–vuggy carbonate reservoir. The foam-assisted nitrogen gas flooding technology has been proven to be a potential EOR technology. However, the flow behaviors of foam-assisted nitrogen gas in fracture–vuggy structures are not clear due to the complex fracture–vuggy structures and their strong heterogeneity. In this work, a three-dimensional visualized fracture–vuggy model is designed and fabricated to investigate the fluids behaviors of foam-assisted N2 flooding and classify the residual oil types after foam-assisted N2 flooding. Experimental results reveal that foam slug can enlarge the sweep efficiency, suppress the formation of nitrogen gas channeling, and detach the oil film. Additionally, the evolution processes of the gas–oil and oil–water interfaces are investigated and analyzed. Moreover, the residual oil types after foam-assisted N2 flooding and nitrogen gas flooding, respectively, are classified and summarized. Compared to nitrogen gas flooding after water flooding, 12.36% more oil can be recovered through foam-assisted N2 flooding. This work further studies the fluid flow behaviors of foam-assisted N2 in the three-dimensional visualized fracture–vuggy carbonate model and also confirms the previous achievements.

show abstract

Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media

Cited by 6 publications

References 31 publications

Experimental Investigation on the Nanosilica-Reinforcing Polyacrylamide/Polyethylenimine Hydrogel for Water Shutoff Treatment

Experimental Investigation on the Nanosilica-Reinforcing Polyacrylamide/Polyethylenimine Hydrogel for Water Shutoff Treatment

Interplay between Viscous Pressure and Capillary Pressure on Polymer Gel Dehydration and Water Shutoff in Hydraulically Fractured Reservoirs

Study on Fluid Behaviors of Foam-Assisted Nitrogen Flooding on a Three-Dimensional Visualized Fracture–Vuggy Model

Contact Info

Product

Resources

About