Examination of disproportionate permeability reduction mechanism on rupture of hydrogels performance

Salehi, Mahsa Baghban; Soleimanian, Mina; Moghadam, Asefe Mousavi

doi:10.1016/j.colsurfa.2018.09.085

Cited by 31 publications

(22 citation statements)

References 21 publications

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“…To improve RPM performance, it is important to understand the gel’s rheological properties. ,,,,,− Therefore, viscosity measurements were conducted using steady shear flow tests, and the viscoelastic properties of the polymer solutions were examined via oscillation shear flow tests. Temperature sweeps mimicking true reservoir temperatures were also conducted.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it was previously shown that the efficiency of a water shutoff treatment strongly depends on the gel quality (i.e., the gel’s rigidity and stability). − Moreover, while there have been recent insights into the mechanism of gel deformation and the associated disproportionate permeability reduction (DPR), ,− further scientific understanding of gel behavior in relation to injection rates is required to guarantee successful gel placement in gas wells. The previous literature works mostly focused on the use of gels to mitigate water production in oil wells.…”

Section: Introductionmentioning

confidence: 99%

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A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

et al. 2020

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Excessive water production is a significant challenge during hydrocarbon production from oil and gas reservoirs, and it is typically controlled by polymer gel placement. However, the fundamental process in terms of how precisely this gel reduces water production in gas reservoirs is rarely reported. The objective of paper is to investigate the impact of cross-linked polyacrylamide (poly(acrylamide-co-acrylic acid) partial sodium salt) gel as a relative permeability modifier for a sandstone/gas/water system and provides insights into the detailed in situ gel behavior inside the porous medium. Stronger gels increased water retention inside the porous media yet decreased the lubrication effect of the gel. Moreover, as the water flow rate increased (during imbibition), the water relative permeability reduction decreased, which is attributed to (a) gel shear thinning behavior and (b) reduction in the residual gas saturation. However, the gel showed shear thickening behavior during gas flow. At low gas flow rates, gel performance is mainly controlled by the gel lubrication effect, while at higher gas flow rates, the significance of gel rigidity is greatly increased. These effects were associated by gas diffusion and gas dissolution in the gel, which in turn expanded the gel layer and reduced gas permeability. Moreover, we identified two counteracting mechanisms (i.e., water retention and lubrication effects) responsible for the disproportionate permeability reduction. In addition, we identified a critical flow rate above which the gel treatment becomes unsuccessful as both effects (i.e., water retention and lubrication) were significantly reduced. These findings thus provide novel insights into the factors leading to successful gel placement to better control water production.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

et al. 2020

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“…The produced liquid from each section during chemical flooding was collected, and the molecular aggregate dimension of the polymer was measured with a Brookhaven BI-200SM dynamic/static light-scattering system (Brookhaven Instruments Corp.). Schemes 1-2 to 1-4: At injection rates of 0.5, 1.0, and 1.5 mL/min, 30,41,43 F R and F RR of the polymer microsphere solution were tested in sections 1-10 of the core. Scheme 1-5: At an injection rate of 1.5 mL/min, F R of the polymer microsphere solution was tested in sections 1-10 of the 18-m-long core.…”

Section: Resistance Factor and Residual Resistance Factormentioning

confidence: 99%

Migration characteristics and deep profile control mechanism of polymer microspheres in porous media

Niu

2019

Energy Science & Engineering

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The performance and migration characteristics of polymer microspheres in porous media and the mechanism of deep profile control for oil displacement were studied by theoretical analysis, instrument detection, and physical simulation to further improve oil recovery. Polymer microspheres were expansive in water and nonexpansive in oil. The polymer microspheres with short expansion times possessed excellent mechanical shear resistance. According to the matching factor (Ra), resistance factor, and residual resistance factor, the migration of polymer microspheres in porous media was divided into four periods: transportation (Ra > 2.41), bridging plugging (1 < Ra < 2.41), elastic plugging (Ra < 1), and fatigue (microsphere breakage). The resistance factor and residual resistance factor of the polymer microspheres during the bridging and elastic plugging periods were larger than those during other periods. The deep oil displacement profile can be controlled by adjusting the occurrence positions (distance from the injection end) of these two periods. Increasing the injection rate during the transportation and bridging plugging periods and decreasing the injection rate during the elastic plugging period made elastic plugging occur farther from the injection end while maintaining the resistance factor and residual resistance factor at high levels. Aimed at the remaining oil accumulation area, the optimal profile control depth of oil displacement (distance from the injection end) of polymer microspheres in porous media can be regulated by changing the injection rate to enhance oil recovery. The simultaneous migration and expansion of polymer microspheres is the main mechanism of microsphere fluid diversion in porous media.

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“…Polymer gels are widely used in mature reservoirs due to their excellent profile control ability, easy preparation, and disproportionate permeability reduction property [ 2 ]. A new trend in gel preparation for EOR is the synthesis of preformed particle gels (PPG) having significant potential for conformance control [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Ketova

Burin

Galkin

et al. 2022

Gels

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In todays’ world, there is an increasing number of mature oil fields every year, a phenomenon that is leading to the development of more elegant enhanced oil recovery (EOR) technologies that are potentially effective for reservoir profile modification. The technology of conformance control using crosslinked microgels is one the newest trends that is gaining momentum every year. This is due to the simplicity of the treatment process and its management, as well as the guaranteed effect in the case of the correct well candidate selection. We identified the following varieties of microgels: microspheres, thermo- and pH-responsible microgels, thin fracture of preformed particle gels, colloidal dispersed gels. In this publication, we try to combine the available chemical aspects of microgel production with the practical features of their application at oil production facilities. The purpose of this publication is to gather available information about microgels (synthesis method, monomers) and to explore world experience in microgel application for enhanced oil recovery. This article will be of great benefit to specialists engaged in polymer technologies at the initial stage of microgel development.

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Examination of disproportionate permeability reduction mechanism on rupture of hydrogels performance

Cited by 31 publications

References 21 publications

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

A Multiscale Investigation of Cross-Linked Polymer Gel Injection in Sandstone Gas Reservoirs: Implications for Water Shutoff Treatment

Migration characteristics and deep profile control mechanism of polymer microspheres in porous media

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

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