Treatment of Condensate and Water Blocks in Hydraulic-Fractured Shale-Gas/Condensate Reservoirs

Ganjdanesh, Reza; Rezaveisi, Mohsen; Pope, Gary A.; Sepehrnoori, Kamy

doi:10.2118/175145-pa

Cited by 29 publications

(7 citation statements)

References 22 publications

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“…studied suitability of DME as an additive for steam injection in recovery of heavy oil and bitumen. Ganjdanesh et al examined the performance of DME in removing condensate in hydraulically fractures reservoirs.…”

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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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%

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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“…where K ij is the binary interaction parameter. The parameters of DME used in PR EOS were obtained from literature (Table 3) [13,32]. 0.10 0.12 0.07 0.02 0.01 0.00 0.25 0.00 0.00 ----C 6-9 0.11 0.12 0.05 0.03 0.02 0.01 0.20 0.00 0.00 0.00 ---C 10-17 0.11 0.12 0.05 0.06 0.04 0.02 0.08 0.02 0.01 0.01 0.00 --C 18-27 0.11 0.12 0.05 0.09 0.06 0.05 0.08 0.03 0.03 0.02 0.00 0.00 -C 28+ 0.11 0.12 0.05 0.12 0.09 0.07 0.08 0.05 0.05 0.03 0.01 0.00 0.00 DME is also soluble in the aqueous phase, and Henry's law was used to determine the fugacity in the aqueous phase.…”

Section: Fluid Modelingmentioning

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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“…All PR EOS components of DME were gathered from a literature reference (Ganjdanesh et al 2016). It was assumed that the gaseous, oleic, and aqueous phases were in thermodynamic equilibrium.…”

Section: Fluid Modelingmentioning

confidence: 99%

Compositional modeling and simulation of dimethyl ether (DME)-enhanced waterflood to investigate oil mobility improvement

2018

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Dimethyl ether (DME) is a widely used industrial compound, and Shell developed a chemical EOR technique called DMEenhanced waterflood (DEW). DME is applied as a miscible solvent for EOR application to enhance the performance of conventional waterflood. When DME is injected into the reservoir and contacts the oil, the first-contact miscibility process occurs, which leads to oil swelling and viscosity reduction. The reduction in oil density and viscosity improves oil mobility and reduces residual oil saturation, enhancing oil production. A numerical study based on compositional simulation has been developed to describe the phase behavior in the DEW model. An accurate compositional model is imperative because DME has a unique advantage of solubility in both oil and water. For DEW, oil recovery increased by 34% and 12% compared to conventional waterflood and CO 2 flood, respectively. Compositional modeling and simulation of the DEW process indicated the unique solubility effect of DME on EOR performance.

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Treatment of Condensate and Water Blocks in Hydraulic-Fractured Shale-Gas/Condensate Reservoirs

Cited by 29 publications

References 22 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

Compositional modeling and simulation of dimethyl ether (DME)-enhanced waterflood to investigate oil mobility improvement

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