Introducing a Novel Enhanced Oil Recovery Technology

Parsons, Charles A.; Chernetsky, A.; Eikmans, D.; Riele, P. te; Boersma, D.; Sersic, I.; Broos, R.

doi:10.3997/2214-4609.201700313

Cited by 13 publications

(11 citation statements)

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“…They also studied phase behavior modeling of the three-phase system in reservoir conditions and suggested equations of state or empirical correlations to estimate partitioning of DME between brine and oil. − Chernetsky et al showcased the results of two tertiary corefloods performed on carbonate rocks, one in continuous and one in slug injection mode. Parsons et al presented results of a tertiary DME coreflood on sandstone using live crude oil. Chahardowli et al , studied the effect of polymer addition to DME–brine solution in order to control the mobility of displacing fluid for high-viscosity oils through coreflooding experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Most proposed EOR methods in the chalk fields enhance recovery by up to 10% − while the additional recovery by DME EOR method in the literature ranges from 10 to 35% for different rock types. , Considering the great potential this novel technique presents, the current study aims to investigate the DME EOR technique in greater depth and address the following uncertainties that are not discussed in the open literature: In all previous studies, the EOR agent was fully saturated with DME at the experimental condition. Since DME preferentially partitions in the oleic phase, the saturation of DME in the front of the EOR agent continuously reduces which may impact the ultimate oil recovery.…”

Section: Introductionmentioning

confidence: 99%

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On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

Javanmard

Seyyedi

Nielsen

2018

Ind. Eng. Chem. Res.

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North Sea tight chalk oil reservoirs are well-known for their submicron pore throat sizes and heterogeneous porosity pattern that includes fractures and microfractures. The host rock of these reservoirs is extremely sensitive and can easily react with the injected fluid, which in turn adversely affects the permeability and thus injectivity. The combined effect of these parameters makes oil production in chalk reservoirs extremely difficult. A novel solvent-based enhanced oil recovery (EOR) method that can address these issues is investigated for the first time in the chalk reservoirs. We thouroughly investigate the oil recovery potential and dominant oil recovery mechanisms by dimethyl ether (DME)−brine injection under conditions pertinent to the North Sea tight chalk oil reservoirs. A series of systematically designed high-pressure and high-temperature flooding experiments were carried out using reservoir core and crude oil. The experimental results revealed the strong oil recovery potential of tertiary DME−brine injection with two different DME contents. Furthermore, both secondary and tertiary DME−brine injection scenarios significantly improved the oil recovery with the better performance in the secondary scenario. The results show that the dominant oil recovery mechanism is rapid and strong oil swelling is caused by the preferential partitioning of DME into the oil phase. During DME−brine injection, no indications of rock mineral dissolution and adverse effects on rock permeability were observed. This is one of the advantages of this method over CO 2 , CO 2 −water alternating gas (WAG), and alkaline injections in which the EOR agent causes calcite dissolution, wormhole formation, and scaling issues in fragile chalk reservoirs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

Javanmard

Seyyedi

Nielsen

2018

Ind. Eng. Chem. Res.

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“…Additionally, DME can be extracted from the produced fluid and reused through distillation and adsorption processes [14]. DME was first introduced as a solvent for EOR by Shell [15][16][17][18], and this method has proven effectiveness in improving oil recovery [14][15][16][19][20][21]. Recent research on DME in the field of EOR has focused on modeling and experiments of the DME-water-oil phase behavior or studies modeling the core scale [15,16,[21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Compositional Modeling of Dimethyl Ether–CO2 Mixed Solvent for Enhanced Oil Recovery

Lee

Jeong

et al. 2021

Applied Sciences

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Dimethyl ether (DME) is a compound first introduced by Shell as a chemical solvent for enhanced oil recovery (EOR). This study aims to investigate the efficiency of EOR using the minimum miscible pressure (MMP) and viscous gravity number when a mixed solvent of CO2 and DME is injected. Adding DME to the CO2 water-alternating-gas process reduces the MMP and viscous gravity number. Reduction in MMP results in miscible conditions at lower pressures, which has a favorable effect on oil swelling and viscosity reduction, leading to improved mobility of the oil. In addition, the viscous gravity number decreases, increasing the sweep efficiency by 26.6%. Numerical studies were conducted through a series of multi-phase, multi-component simulations. At a DME content of 25%, the MMP decreased by 30.1% and the viscous gravity number decreased by 66.4% compared with the injection of CO2 only. As a result, the maximum oil recovery rate increased by 31% with simultaneous injection of DME and CO2 compared with only using CO2.

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“…DME is miscible with oil and due to its slight polarity, it also can be dissolved in water, which makes it an attractive candidate for tertiary recovery as an additive to the injected water. DME enhanced water-flooding (DEW) is a novel EOR technique, first introduced by Shell (M. Chernetsky et al, 2015;Parsons et al, 2017), that can significantly increase the oil recovery (Chahardowli et al, 2013;Mohammad Chahardowli et al, 2016;Javanmard et al, 2018;Riele et al, 2016). Initially, water flooding is performed to produce oil from a virgin reservoir (Figure 1, Step 2).…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of water-soluble solvents for enhancing oil recovery in heterogeneous chalk reservoirs

Mahdizadeh

Eftekhari

Nick

2019

Journal of Petroleum Science and Engineering

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Introducing a Novel Enhanced Oil Recovery Technology

Cited by 13 publications

References 0 publications

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

On Oil Recovery Mechanisms and Potential of DME–Brine Injection in the North Sea Chalk Oil Reservoirs

Compositional Modeling of Dimethyl Ether–CO2 Mixed Solvent for Enhanced Oil Recovery

Numerical modeling of water-soluble solvents for enhancing oil recovery in heterogeneous chalk reservoirs

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