Wettability determination of core samples through visual rock and fluid imaging during fluid injection

Schneider, Marc; Osselin, Florian; Andrews, B.; Rezgui, Fadhel; Tabeling, Patrick

doi:10.1016/j.petrol.2011.05.016

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…The diameter ranges of pores, cavities and fractures are 0.099-0.181 mm, 1.161-1.657 mm and 0.325-0.492 mm, respectively. The maximum allowable stress can up to 10 MPa The contact angle of these micromodels is 36.4°-36.7° (water-wet), which is similar to the water-wet carbonate rocks in study area [37].…”

Section: Micromodel Fabrication Based On Microelectronic Photolithogrsupporting

confidence: 59%

Visual Investigation of the Occurrence Characteristics of Multi-Type Formation Water in a Fracture–Cavity Carbonate Gas Reservoir

et al. 2018

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It is difficult to investigate the formation process and occurrence states of water in multi-type reservoirs, due to the strong heterogeneity and complex microstructure of the fracture-cavity carbonate gas reservoirs. To date, there is no systematic study on the occurrence characteristics of multi-type formation water, especially through visual observation experiments. In this paper, a new creation method for visual micromodels based on CT scan images and microelectronic photolithography techniques was described. Subsequently, a gas-drive-water visual experiment was conducted to intuitively study the formation mechanism and the occurrence states of formation water. Then, the ImageJ gray analysis method was utilized to quantitatively investigate the gas-water saturation and the proportion of residual water film. Finally, the occurrence characteristics of formation water and its effects on gas seepage flow were comprehensively analyzed. Visual experimental results showed that: the migration processes of natural gas in different types of reservoirs are different; the water in multiple media consists of native movable water and residual water, and residual water is composed of secondary movable water and irreducible water; the residual water mainly occurs in different locations of different reservoirs with the forms of "water film", "water mass", "water column" and "water droplets"; the main influencing factors are capillary force, surface tension, displacement pressure and channel connectivity. Quantitative results reflect that the saturation of movable water and residual water are the parameters related directly to reservoir physical properties, pore structure and displacement pressure-the smaller the size of flow channel, the larger the space occupied by water film; the thickness proportion of water film is increasing exponentially with the channel size; the thickness proportion of water film decreases as the increase of displacement pressure; the thickness proportion of water film is essentially constant when the displacement pressure increases to a certain extent. The conducted visual investigation not only improves our intuitive understanding of the occurrence characteristics of formation water, but also provides a theoretical basis for the efficient development of fracture-cavity gas reservoirs.

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Section: Micromodel Fabrication Based On Microelectronic Photolithogrsupporting

confidence: 59%

Visual Investigation of the Occurrence Characteristics of Multi-Type Formation Water in a Fracture–Cavity Carbonate Gas Reservoir

et al. 2018

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“…When the target water saturation is close to the residual value (defined as the minimum saturation that is possible to be reached by following the drainage curve), this simple method is not efficient anymore. Indeed, because of the wettability of the medium, the wetting fluid will be trapped by capillary forces while the non-wetting one will flow between the pockets of the wetting fluid [14]. Accordingly, reaching water saturations close to the residual saturation needs a very high ratio between the two flow rates (1000 or more), which is not compatible with the technical limitations of the experimental set-up (mainly the limited volume of the pumps bodies).…”

Section: Relative Permeabilitiesmentioning

confidence: 99%

Experimental investigation of the influence of supercritical state on the relative permeability of Vosges sandstone

Osselin

Fabbri

Fen‐Chong

et al. 2015

Comptes Rendus. Mécanique

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International audienceMeasurements of relative permeabilities involve complex and long experiments, especially when dealing with supercritical carbon dioxide at high pressures and temperatures. However, the development of CCS (Carbon Capture and Storage) underlined the need of such experiments in order to carry-out the indispensable simulations of the behavior of deep saline aquifers or other geological formations subjected to carbon dioxide injection. In this article, we present the measurement of relative permeabilities of a sandstone with a new experimental set-up with the fluid pairs gaseous CO2/water and supercritical CO2/water. For highly permeable and non-reactive materials, the results are almost identical, showing little influence of the pressure, temperature, and physical state of the considered fluids on the obtained data

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“…The wetting-drying cycle refers to the process in which the rock mass is continuously subjected to repeated cycles of soaking, dewatering, soaking, and dewatering under rainfall or groundwater conditions [12][13][14][15][16][17][18][19]. In this process, the physical and mechanical parameters of the rock mass are continuously weakened, the strength is continuously reduced, and the creep aging effect is continuously intensified [20][21][22][23][24][25][26], with the increase of time, under certain conditions, it may even cause accidents such as engineering instability and failure.…”

Section: Introductionmentioning

confidence: 99%

Study on creep mechanical properties of carbonaceous shale under dry-wet cycle

Wei¹,

et al. 2023

Phys. Scr.

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The creep mechanical properties of rock under dry-wet cycles are of great significance for studying the long-term aging stability of engineering rock and soil. In the past, there were few studies in this area, and most of the dry-wet cycle tests on rock samples did not conform to the actual stress state of the rock. In view of the shortcomings of these studies, this paper innovatively carried out the dry-wet cycle test of the rock under the continuous state of the stress field, and studied its mechanical properties. The specific method is to take carbonaceous shale as the research object, and use the soft rock shear rheological test system independently developed by our research group to carry out the shear creep test of carbonaceous shale under the action of dry-wet cycle. The test results show that the creep full-time curves of carbonaceous shale under different dry-wet cycles show a step-shaped curve shape. The dry-wet cycle has a significant effect on the deformation characteristics of carbonaceous shale. With the increase of the number of dry-wet cycles, the instantaneous strain of the rock gradually increases, the instantaneous shear modulus decreases from 596.650 MPa at 0 times to 365.199 MPa at 12 times, and the attenuation rate reaches 38.79 %. The creep strain and cumulative creep strain become larger, the stress required for accelerated creep decreases from 3.29 MPa to 2.75 MPa, and the accelerated creep time in the third stage increases from 11.892 h to 5.316 h, and the creep effect is more significant. The long-term strength of carbonaceous shale decreases from 3.05 MPa to 2.49 MPa, and the decrease increases with the increase of dry-wet cycles. The more the number of dry-wet cycles, the smaller the undulation of the shear failure section of the carbonaceous shale, and the smoother the surface. The research results have important guiding significance for the long-term aging stability analysis of engineering rock and soil mass subjected to repeated dry-wet cycles.

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Wettability determination of core samples through visual rock and fluid imaging during fluid injection

Cited by 9 publications

References 23 publications

Visual Investigation of the Occurrence Characteristics of Multi-Type Formation Water in a Fracture–Cavity Carbonate Gas Reservoir

Visual Investigation of the Occurrence Characteristics of Multi-Type Formation Water in a Fracture–Cavity Carbonate Gas Reservoir

Experimental investigation of the influence of supercritical state on the relative permeability of Vosges sandstone

Study on creep mechanical properties of carbonaceous shale under dry-wet cycle

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