Laboratory Investigation of Miscible CO2 WAG Injection Efficiency in Carbonate

Duchenne, Sebastien; Puyou, Gilles; Cordelier, Philippe; Bourgeois, Marcel; Hamon, Gérald

doi:10.2118/169658-ms

Cited by 19 publications

(4 citation statements)

References 10 publications

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“…Higher recovery is obtained if the injected gas achieves miscibility at reservoir condition and the oil left behind, as S orm is very low. There will be trapping of large amount of gas during the 1 st cycle of WAG injection that will be reduced subsequently in later cycles (Duchenne et al, 2014). Figure 9 shows the oil recovery and GOR match of the two experiments performed using Eclipse software.…”

Section: Exp# 2: Coreflood At 4800psimentioning

confidence: 99%

Gas Injection EOR Screening by Laboratory Experiment and Sector Modeling in Carbonate Reservoir

Kumar¹,

Yammahi²,

Nakashima³

2015

Day 3 Wed, November 11, 2015

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Hydrocarbon gas injection projects are undertaken in order to maintain reservoir pressure, produce oil through swelling and reduce residual oil saturation by decreasing the interfacial tension (IFT). Along with local displacement efficiency, macroscopic sweep efficiency plays a dominant role in the success of gas injection projects, as recovery from the field depends strongly on reservoir geology and petrophysical properties.In this paper, a procedure to screen the best injectant for implementation of a successful gas injection pilot project is discussed. To determine the microscopic sweep efficiency, PVT experiments and coreflood tests are conducted. First, minimum miscibility pressure (MMP), oil solubility and IFT values are measured through PVT experiments, which is followed by unsteady-state coreflood experiments on 200 cm long cores to evaluate the sweep efficiency at miscible and immiscible conditions. Data from the experiments are used to evaluate oil recovery in a sector model extracted from the full field model. The sector model analysis for different injection scenarios provides sweep efficiency and guidelines for the implementation of the gas injection pilot project.The coreflood experiments show improvement in recovery in immiscible conditions due to oil swelling and reduction in IFT, while higher recovery is achieved in miscible conditions due to multiple-contact miscibility. Evaluation of the macroscopic sweep efficiency in the sector model highlights the issue of gas override, and suggests improving the sweep by gas enrichment, as well as water-alternating-gas injection (WAG).

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Section: Exp# 2: Coreflood At 4800psimentioning

confidence: 99%

Gas Injection EOR Screening by Laboratory Experiment and Sector Modeling in Carbonate Reservoir

Kumar¹,

Yammahi²,

Nakashima³

2015

Day 3 Wed, November 11, 2015

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“…The type of gas injected is also a highlight; applications with CO 2 injections have produced better results than hydrocarbons or other gases (Christensen et al 1998). The literature results also showed higher efficiency of CO 2 -WAG injections compared to pure CO 2 injections (Duchenne et al 2014). However, these recovery methods present high operating costs due to the gas, which represents a large fraction of the total cost, besides requiring compression and gas injection equipment, especially for CO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Kulkarni and Rao (2005) showed that the results with WAG recovery were better than CGI and the miscible condition was more favorable than the immiscible. Duchenne et al (2014) investigated the microscopic efficiency of CO 2 in the WAG injection well above the minimum pressure of miscibility (MMP) in the samples. They found recovery factors of the order of 80%, measured through a precise system of monitoring the saturations of the three phases and by calculating the volume produced.…”

Section: Introductionmentioning

confidence: 99%

Impact of physical phenomena and cyclical reinjection in miscible CO2-WAG recovery in carbonate reservoirs

Sampaio

Mello

Schiozer

2020

J Petrol Explor Prod Technol

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Carbonated reservoirs with high percentage of CO2 have been discovered and produced in the Brazilian pre-salt cluster. Recovery techniques, such as CO2-WAG, have hence been evaluated and applied, as in the Lula field. Although studies demonstrate the advantages of this technique, it is still difficult to estimate an increase in oil recovery. Thus, this work presents a methodology to evaluate the impacts of the main phenomena that occur and how CO2 recycling can benefit the management of these fields. The results showed an increase in recovery with the modeling of the main phenomena such as relative permeability hysteresis and aqueous solubility of CO2, accompanied by a significant increase in CO2 injection. However, the recycling of the CO2 produced was shown to be fundamental in the reduction in this injection and to increase the NPV. The results showed a 4% increase in oil production and 9% in NPV, considering a producer–injector pair.

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“…Since the late 60s, a number of laboratory and simulation studies has been conducted in detail concerning different issues of WAG process properties and design [18,[48][49][50], enabling us to use it more effectively in different reservoir conditions. Most of the published laboratory WAG process studies are focused on commonly used hydrocarbon and non-hydrocarbon (especially pure CO 2 and N 2 ) [19,51,52] gases. Increased interest in CO 2 EOR is particularly evident in recent years because of its high effectivity as well as environmental and economic implication when combined with CCS [53].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of Immiscible High-Nitrogen Natural Gas WAG Injection Efficiency in Mixed-Wet Carbonate Reservoir

et al. 2020

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Crucial oil reservoirs are located in naturally fractured carbonate formations and are currently reaching a mature phase of production. Hence, a cost-effective enhanced oil recovery (EOR) method is needed to achieve a satisfactory recovery factor. The paper focuses on an experimental investigation of the efficiency of water alternating sour and high-nitrogen (~85% N2) natural gas injection (WAG) in mixed-wetted carbonates that are crucial reservoir rocks for Polish oil fields. The foam-assisted water alternating gas method (FAWAG) was also tested. Both were compared with continuous water injection (CWI) and continuous gas injection (CGI). A series of coreflooding experiments were conducted within reservoir conditions (T = 126 ℃, P = 270 bar) on composite cores, and each consisted of four reservoir dolomite core plugs and was saturated with the original reservoir fluids. In turn, some of the experiments were conducted on artificially fractured cores to evaluate the impact of fractures on recovery efficiency. The performance evaluation of the tested methods was carried out by comparing oil recoveries from non-fractured composite cores, as well as fractured. In the case of non-fractured cores, the WAG injection outperformed continuous gas injection (CGI) and continuous water injection (CWI). As expected, the presence of fractures significantly reduced performance of WAG, CGI and CWI injection modes. In contrast, with regard to FAWAG, deployment of foam flow in the presence of fractures remarkably enhanced oil recovery, which confirms the possibility of using the FAWAG method in situations of premature gas breakthrough. The positive results encourage us to continue the research of the potential uses of this high-nitrogen natural gas in EOR, especially in the view of the utilization of gas reservoirs with advantageous location, high reserves and reservoir energy.

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Laboratory Investigation of Miscible CO2 WAG Injection Efficiency in Carbonate

Cited by 19 publications

References 10 publications

Gas Injection EOR Screening by Laboratory Experiment and Sector Modeling in Carbonate Reservoir

Gas Injection EOR Screening by Laboratory Experiment and Sector Modeling in Carbonate Reservoir

Impact of physical phenomena and cyclical reinjection in miscible CO2-WAG recovery in carbonate reservoirs

Experimental Studies of Immiscible High-Nitrogen Natural Gas WAG Injection Efficiency in Mixed-Wet Carbonate Reservoir

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