Pushing the Envelope of Polymer Injectivity in Low Permeability Sandstones

Ghosh, Pranab; Metidji, Mahmoud Ould; Dupuis, Guillaume; Wilton, Ryan Richard; Ravikiran, Ravi; Bowers, Annalise; Seright, R.S.

doi:10.3997/2214-4609.202133035

Cited by 10 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It can be seen from the figure that the polymer was not applicable for low permeability (up to 10 mD), which could be due to the increased value of adsorption, formation clogging, or a sharp decrease of reservoir properties. A possible solution for displacement oil from low permeability PK formation may be the use of a low-molecular-mass polymer with lower adsorption values and better filtration properties [41,42]. Further calculations did not consider the results obtained from the displacement of oil from the 7-mD-permeable reservoirs because of the total loss of intake formation capacity in the calculation.…”

Section: Resultsmentioning

confidence: 99%

Environmentally Safe Technology to Increase Efficiency of High-Viscosity Oil Production for the Objects with Advanced Water Cut

et al. 2022

View full text Add to dashboard Cite

The depletion of conventional oil reserves creates a significant demand for the development and improvement of methods and technologies for the production of hard-to-recover oil. A huge potential for hard-to-recover oil in Western Siberia lies in the Pokur suite (PK). These deposits are characterized by high oil viscosity and, accordingly, early water breakthrough. This study identifies and substantiates an effective technology for oil production from such and similar deposits using polymer flooding. The obtained data are based on research of the geological structure, the main reservoir properties and those of its fluids, chemical and laboratory methods of analysis, and the results of mathematical and hydrodynamic modeling. According to the results of hydrodynamic modeling, the greatest technological effect of polymeric water flooding is observed in the model of collector permeability at 70 mD and above 1000 mD, but this technology is not recommended for reservoirs with an average permeability of less than 10 mD. Implementation of the best practices through the prism of the resource nexus allows sustainable water management by applying environment-friendly polymers for enhanced oil recovery and contributes to the UN Goal 6 of clean water and sanitation.

show abstract

Section: Resultsmentioning

confidence: 99%

Environmentally Safe Technology to Increase Efficiency of High-Viscosity Oil Production for the Objects with Advanced Water Cut

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Размер молекул полимера ограничит проход состава в поровое пространство, а в призабойной зоне пласта произойдет кольматация, что в дальнейшем может привести к проблемам с приемистостью. Также показатель проницаемости необходимо учитывать и в средне проницаемых коллекторах, так как у разного полимера различные размеры молекул и в определенных условиях они также могут тампонировать поровое пространство [6].…”

Section: критерии эффективного внедрения технологии полимерного завод...unclassified

The current level and prospects for the development of large-volume injection technologies using polymers to increase oil recovery

Podoprigora

Byazrov

Khristich

2022

The Eurasian Scientific Journal

View full text Add to dashboard Cite

Currently, there is a worldwide decline in the level of production while maintaining the level of consumption. At the same time, the newly discovered fields are not able to compensate for the volumes of extracted oil, since the volumes of reserves are mainly small or medium. In this regard, it is relevant to introduce technologies to increase oil recovery at already drilled and developed fields. A promising method of increasing oil recovery is polymer flooding, which has many years of successful experience in both Russia and abroad. Polymer flooding technology consists in adding dry polymer to the injected water in concentrations from 0.05 to 0.25 % in order to increase its viscosity, which in turn contributes to improving the flooding process. The polymer rim equalizes the ratio of mobility in the reservoir and allows oil to be uniformly displaced from reservoirs in which there is a heterogeneity in permeability. The key result in the implementation of the technology is an increase in the oil recovery coefficient by improving the coverage of the reservoir by the flooding process, as well as a gradual increase in water availability, without early water breakthroughs from injection to production wells. This technology has wide limits of applicability and has already proven its effectiveness in various geological and physical conditions. This article will consider the physical basis of exposure, the principle of action, the criteria of applicability, the main groups of chemical reagents, and the accumulated domestic and international experience in the design and implementation of polymer flooding technology, development trends and the main difficulties associated with the introduction of this technology.

show abstract

“…Sheng et al proposed a threshold permeability limit of 50 mD for polymer flooding. Recently, the evaluation of polymer flooding applicability for tight reservoirs with permeability as low as 30 mD has sparked worldwide interest − …”

Section: Introductionmentioning

confidence: 99%

“…Considering the recent efforts made toward adopting polymer flooding for low-permeability formations − and the significance of Sor reduction to the overall recovery factor, , a consolidated effort is needed to investigate the effect of polymer’s viscoelasticity on Sor reduction in low-permeability rocks. Therefore, the objectives of this paper are: (1) to formulate two polymer systems of varying viscosities and elasticities using rheometry and then perform core flooding experiments at a low Darcy velocity of 0.2 ft/day in sequential mode to investigate if the polymer’s elasticity can lead to true Sor reduction in a well-swept core at a flux much far away from the well, (2) to determine whether the polymer viscoelasticity relies solely on the high pressure drop to mobilize residual oil in low-permeability rocks, and (3) to finally investigate what would happen to the flow behavior and recovery profiles in low-permeability cores if the polymer elasticity is increased due to an increased MW.…”

Section: Introductionmentioning

confidence: 99%

Is There a Viscoelastic Effect of Low-MW HPAM Polymers on Residual Oil Mobilization in Low-Permeability Rocks at a Darcy Velocity of 0.2 ft/Day?

Barri,

Azad,

Al-Shehri

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

High-molecular-weight (MW) polymer solutions with significant viscoelasticity have been reported to positively influence residual oil saturation (Sor) reduction at high pressure gradients and/ or high fluxes. The lower the permeability, the lower the acceptable MW for transportable polymers and, therefore, the lower the viscoelastic effects in porous media. The objective of this paper is to answer the following question: how does a polymer's viscoelasticity influence Sor reduction in low-permeability formations? Initially, two low-MW polymer systems are formulated by varying the concentration, and sequential core flooding is performed with a 35 mD rock sample by injecting the viscous polymer first followed by a relatively elastic polymer at a low Darcy velocity of 0.2 ft/day. Results reveal that viscous 6000 ppm HPAM 3130 injection corresponds to a 55.9% recovery with an injection pressure of ∼80 psi. Interestingly, the secondary injection of relatively elastic 4500 ppm HPAM 3230 further increases the recovery to 58.8%, thereby resulting in an incremental recovery of 2.9% at an injection pressure of ∼60 psi. This incremental oil recovery due to the elastic polymer can solely be attributed to residual oil mobilization that is well-swept during the preceding viscous polymer injection at a relatively higher pressure. Although Sor reduction is observed with the elastic polymer at a relatively low pressure of 60 psi, 60 psi generated during 0.2 ft/day propagation in low-permeability rocks is still in the high range. This work provides experimental evidence for residual oil mobilization in low-permeability rocks with a low-MW high-concentration elastic polymer at 0.2 ft/day.

show abstract

Pushing the Envelope of Polymer Injectivity in Low Permeability Sandstones

Cited by 10 publications

References 8 publications

Environmentally Safe Technology to Increase Efficiency of High-Viscosity Oil Production for the Objects with Advanced Water Cut

Environmentally Safe Technology to Increase Efficiency of High-Viscosity Oil Production for the Objects with Advanced Water Cut

The current level and prospects for the development of large-volume injection technologies using polymers to increase oil recovery

Is There a Viscoelastic Effect of Low-MW HPAM Polymers on Residual Oil Mobilization in Low-Permeability Rocks at a Darcy Velocity of 0.2 ft/Day?

Contact Info

Product

Resources

About