Diffusion and gravity drainage tests to support the development of a dual porosity simulator

Suffridge, F.E.; Renner, T. A.

doi:10.3997/2214-4609.201411278

Cited by 4 publications

(1 citation statement)

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“…Investigation of the role of molecular diffusion in the recovery of waterflood residual oil by CO2 injection is a huge topic for researchers. The subject topic is the overall goal of assessing the economic feasibility of CO2 flooding the naturally fractured reservoir (John, 1986;Luan, 1994;Orr and Tabber;1983;Schecker et al, 1981, Schecker et al, 1998Scheckter and Guo 1996;Suffridge et al, 1994;Taylor;1975;Turek and Metcalfe, 1984;Wang, 1982). Effects of other critical parameters (temperature, pressure, injection rate, injection pattern and initial water saturation) on CO2 injection which was also the goal of investigation, is very difficult to analyze.…”

Section: Introductionmentioning

confidence: 99%

Role of molecular diffusion in the recovery of water flood residual oil

Amadi¹,

Ukpaka²

2019

Preprint

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Traditionally, carbon dioxide (CO2) injection has been considered an inefficient method for enhancing oil recovery from naturally fractured reservoirs. Obviously, it would be useful to experimentally investigate the efficiency of waterflooding naturally fractured reservoirs followed by carbon dioxide (CO2) injection. This issue was investigated by performing water imbibition followed by CO2 gravity drainage experiments on artificially fractured cores at reservoir conditions. The experiments were designed to illustrate the actual process of waterflooding and CO2 gravity drainage in a naturally fractured reservoir in the Brass Area, Bayelsa. The results demonstrate that CO2 gravity drainage could significantly increase oil recovery after a waterflood. During the experiments, the effects of different parameters such as permeability, initial water saturation and injection scheme was also examined. It was found that the efficiency of the CO2 gravity drainage decrease as the rock permeability decreases and the initial water saturation increases. Cyclic CO2 injection helped to improve oil recovery during the CO2 gravity drainage process which alters the water imbibition. Oil samples produced in the experiment were analyzed using gas chromatography to determine the mechanism of CO2-improved oil production from tight matrix blocks. The results show that lighter components are extracted and produced early in the test. The results of these experiments validate the premises that CO2 could be used to recover oil from a tight and unconfined matrix efficiently.

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Section: Introductionmentioning

confidence: 99%

Role of molecular diffusion in the recovery of water flood residual oil

Amadi¹,

Ukpaka²

2019

Preprint

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Gas Gravity Drainage Under Secondary and Tertiary Conditions in Fractured Reservoirs

Saidi

Sakthikumar

1993

Middle East Oil Show

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Variety of gases can be used for injection into reservoirs under conditions varying from immiscibility to full miscibility. Also gas injection has found applications in both secondary and tertiary conditions. The advantage and disadvantage of different combinations of each of the above will depend on the particular context. The reported laboratory work and subsequent simulation work has been done in clarifying the influence of the parameters controling the efficiency of the different processes under gravity drainage conditions. This paper addresses the problem of oil recovery by gas injection under primary condition and of water flooded reservoirs with particular emphasis on the use of lean hydrocarbons gas. A systematic investigation was carried out to highlight the parameters controling such processes. The work comprised of analysing reported laboratory experiments under reservoir conditions and interpretation of these experiments using a compositional simulator. Laboratory experiments included both centrifuge tests and core floods under reservoir conditions. The core displacement was designed to help determine the 3- phase oil relative permeability at low oil saturation. The investigation confirms that tertiary lean gas injection is capable of mobilizing Waterflood residual oil and thus reducing the residual oil saturation. The work also helps to identify the role of 3- phase relative permeability. In addition the role of gas-oil diffusion under tertiary condition is discussed. Moreover, simulations were made to clarify the effect of block boundaries in block-to-block interaction.

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Some Theoretical Aspects of Gravity Drainage in Naturally Fractured Reservoirs

Luan

1994

SPE Annual Technical Conference and Exhibition

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The mathematical model of gravity drainage in naturally fractured reservoirs and singular perturbation analyses are presented which explore the effect of capillary, gravity, and wettability on oil saturation distribution and oil recovery in reimbibition. This study shows that wettability capillary end effect and fracture transmissibility appear to be most important factors in oil recovery. Numerical results are also presented which summarize and compare the effective saturation in nonequilibrium state with the actual saturation in equilibrium state. Based on this work, we believe reimbibition or capillary continuity in a stack of matrix blocks can not provide higher oil recovery than in continuity core. Introduction In recent years, growing attention has been focused on reimbibition and capillary continuity in gravity drainage. Reimbibition process is closely related to various forces (gravity, capillary, viscous, diffusive and relaxation). However, the experimental and theoretical research on gravity drainage mechanism in naturally fractured reservoirs is limited. Bogomolova and Glazova (1970) have observed the end effects and saturation discontinuities on the boundaries of unconsolidated porous media with some different permeability. Hagoort (1980) used the classical Buckley-Leverett theory to study the gravity drainage in homogeneous media, and indicated that oil relative permeability is a key factor in the gravity-drainage process. Barenblatt's work investigated the end effects in heterogeneous media. Recent experiments and observations by Firoozabadi and his co-worker (l992), Catalan and Dullien (1992) prompted us to reexamine the gravity drainage mechanism. This study has tried to examine from both a mathematical and a physical viewpoint the key features of gravity drainage in a stack of matrix blocks. P. 357^

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Diffusion and gravity drainage tests to support the development of a dual porosity simulator

Cited by 4 publications

References 0 publications

Role of molecular diffusion in the recovery of water flood residual oil

Role of molecular diffusion in the recovery of water flood residual oil

Gas Gravity Drainage Under Secondary and Tertiary Conditions in Fractured Reservoirs

Some Theoretical Aspects of Gravity Drainage in Naturally Fractured Reservoirs

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