Taking advantage of injectivity decline for improved recovery during waterflood with horizontal wells

Bedrikovetsky, Pavel; Nguyen, Thi Kim Phuong; Hage, Andrew; Ciccarelli, J.; Wahab, Mohammad ab; Chang, Gladys; Souza, Antônio Luiz Serra de; Furtado, Cláudio

doi:10.1016/j.petrol.2011.05.020

Cited by 12 publications

(3 citation statements)

References 13 publications

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“…With continuous displacement of oil by freshwater injection, water saturation of the waterflooded zone of well G6-104 has increased, with a corresponding decrease in residual oil saturation (Soo and Radke, 1986a;1986b;Bedrikovetsky et al, 2011). The oil saturation of the waterflooded area dropped to 31.1% from 57.8%, reflecting the strong washing experienced by the reservoir.…”

Section: Changes In Fluid After Waterfloodingmentioning

confidence: 99%

Identification of waterflooded zones and the impact of waterflooding on reservoir properties of the Funing Formation in the Subei Basin, China

Zhang

Ren

et al. 2013

J. Zhejiang Univ. Sci. A

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This paper describes the identification of waterflooded zones and the impact of waterflooding on reservoir properties of sandstones of the Funing Formation at the Gao 6 Fault-block of the Gaoji Oilfield, in the Subei Basin, east China. This work presents a new approach based on a back-propagation neural network using well log data to train the network, and then generating a cross-plot plate to identify waterflooded zones. A neural network was designed and trained, and the results show that the new method is better than traditional methods. For a comparative study, two representative wells at the Gao 6 Fault-block were chosen for analysis: one from a waterflooded zone, and the other from a zone without waterflooding. Results from this analysis were used to develop a better understanding of the impact of waterflooding on reservoir properties. A range of changes are shown to have taken place in the waterflooded zone, including changes in microscopic pore structure, fluids, and minerals.

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Section: Changes In Fluid After Waterfloodingmentioning

confidence: 99%

Identification of waterflooded zones and the impact of waterflooding on reservoir properties of the Funing Formation in the Subei Basin, China

Zhang

Ren

et al. 2013

J. Zhejiang Univ. Sci. A

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“…Usually, the low permeability reservoirs are characterized by low waterflood injectivity, poor sweep, and low productivity, because of their internal microporous or even nanoporous structure. 1 The average oil recovery from low permeability reservoirs after the primary production period (produced by natural reservoir energy) is only about 13%, which means that an enormous amount of petroleum is left underground thereafter. In recent years, most of the low permeability oil fields in the world have entered the stage of water flooding exploitation, with which crude oil cannot be displaced from the formation unless enough water is injected into the macro and nanopores.…”

Section: Introductionmentioning

confidence: 99%

“…Low permeability reservoirs are widely distributed among the world, and Changqing Oilfield (Xi’an, China) and Yanchang Oilfield (Yan’an, China) are the representative ones in China. Usually, the low permeability reservoirs are characterized by low waterflood injectivity, poor sweep, and low productivity, because of their internal microporous or even nanoporous structure . The average oil recovery from low permeability reservoirs after the primary production period (produced by natural reservoir energy) is only about 13%, which means that an enormous amount of petroleum is left underground thereafter.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Silica with Potential for Water-Injection Augmentation of a Low-Permeability Reservoir: Drag Reduction and Self-Cleaning Ability in Relation to Interfacial Interactions

et al. 2019

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An aqueous nanofluid containing superhydrophobic silica nanoparticles with a high surface activity and an average size of 7 nm was used to enhance the water injection of a low-permeability well. The mechanism for the aqueous nanofluid to enhance water injection was discussed. Findings indicate that the silica aqueous nanofluid can greatly increase the effective water permeability even after injecting water for 2100 pore volumes. This is because the hydrophobic silica nanoparticles can be well adsorbed onto the surface of the porous channels to cause hydrophilic to hydrophobic transformation. Both the hydrophobic capillary force and adhesion work contribute to increasing water injection; and in particular, there is a critical point in the pressure-permeability curves for the rock cores with different wettabilities. Only above the critical point, the hydrophobic rock core exhibits a higher effective water permeability than that of the hydrophilic one, which is imperative for drag reduction. Moreover, the hydrophobic rock core surface has a remarkable self-cleaning ability and can reduce the expansion ratio of clay and inhibit the formation of scale in association with the increase of effective porosity via decreasing the hydration film amount. This approach, highlighting the important role of wettability alteration in increasing water injection, could potentially promote the application of a silica aqueous nanofluid in enhanced oil recovery.

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Effect of different injection fluids scenarios on swelling and migration of common clays in case of permeability variations: a micromodel study

Karami

Sedaee

Nakhaee

2023

J Petrol Explor Prod Technol

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Swelling and migration of present clays make damage to the oil reservoirs due to low salinity waterflooding (LSWF) can induce serious problems in the case of oil recovery improvement and researchers are trying to solve this problem. The purpose of this work is to investigate the mechanism of two phenomena of swelling and migration clays in the porous media of a reservoir rock by injecting a different composition of LSWF using a glass micromodel and providing the appropriate composition and pattern of injection with the removal of damage. Proper water flooding design, application of efficient swelling inhibitors, and migration control are among the most important methods to overcome the problem of formation damage due to swelling and migration of clays. A series of static (bulk or bottle test) and dynamic tests were carried out using a micromodel with a coating of kaolinite and montmorillonite clays in the vicinity and injection of different low salt water compositions. The type and amount of these clays were selected based on the results of XRD and SEM mineralogical tests on real reservoir rock, FW and diluted FW, SW and diluted SW, solution of 1% zirconium oxychloride in 20 times diluted seawater (SI), and composition of nanofluid MgO, SiO2, and Al2O3 in 20 times diluted. In the studies conducted by the micromodel, only the images taken were used in the analysis of the mechanisms, but here, the input and output pressures of the micromodel were recorded with high-precision pressure transmitters, and by using the differential pressure, the permeability was calculated and the formation damage index was introduced. The overlap of the interpretation of the captured images and the changes of the numerical parameter of the damage index in all stages of injection of smart water composition was considered to evaluate the simultaneous and separate mechanisms of swelling and migration of clays. The results of the experiments in this research show that clay swelling has destructive effects on permeability, and migration due to the transfer of clays from the porous medium can have promising effects on reducing the damage index in some conditions. And it is necessary to use the swelling control compound during the flooding process, but the migration inhibitor compound is not always suitable. Gradual reduction of salinity is also introduced as a pattern to prevent swelling damage or clay migration.In general, in this study, the best design and fluid engineering for smart water injection with the least damage in the micromodel scale was presented.

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Taking advantage of injectivity decline for improved recovery during waterflood with horizontal wells

Cited by 12 publications

References 13 publications

Identification of waterflooded zones and the impact of waterflooding on reservoir properties of the Funing Formation in the Subei Basin, China

Identification of waterflooded zones and the impact of waterflooding on reservoir properties of the Funing Formation in the Subei Basin, China

Hydrophobic Silica with Potential for Water-Injection Augmentation of a Low-Permeability Reservoir: Drag Reduction and Self-Cleaning Ability in Relation to Interfacial Interactions

Effect of different injection fluids scenarios on swelling and migration of common clays in case of permeability variations: a micromodel study

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