Numerical simulation of water production process and spontaneous imbibition in a fractured gas reservoir – A case study on homa gas field

Akbarifard, Mohammad Ghasem; Azdarpour, Amin; Aboosadi, Zahra Arab; Honarvar, Bizhan; Nabipour, Moein

doi:10.1016/j.jngse.2020.103603

Cited by 9 publications

(5 citation statements)

References 27 publications

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“…After the fracturing process, the fracture conductivity of formation is increased, which makes the fluid flow more easily (Ranjbar and Hassanzadeh, 2011;Di et al, 2021;Memon et al, 2022). However, during fracturing in some tight reservoir with bottom water, the fractures may connect with the bottom water, which results in early water breakthrough or serious water flooding (Alblooshi and Wojtanowicz, 2018;Moghadasi et al, 2019;Akbarifard et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on plugging performance of nanospheres in low-permeability reservoir with bottom water

Tang¹,

Wang²,

Deng³

et al. 2022

Adv. Geo-Energy Res.

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The oil production rate decreases rapidly after a short period of high yield from acidizing or fracturing in low-permeability reservoirs. In this paper, nanospheres are applied before the fracturing step, which possess the ability to absorb water and expand in the water layer, reducing the flow capacity of bottom water and finally enhancing the oil recovery. The plugging performance is investigated by nanosphere displacement experiments in cores and sand-packs, which explores the plugging effect in the oil layer, the oil-water transition zones, the water layer and the fracturing zones. In addition, a nuclear magnetic resonance experiment is conducted to study the flow mechanism of nanospheres and determine the plugging rates, which can characterize the plugging performance of nanospheres in porous media. The results show that the plugging rate is 85.84% and 78.65% on the water layer and oil-water transition zone, respectively, and 94.36% in the fracturing zone. Meanwhile, the nanospheres cannot plug the oil layer. The formation pressure has a less considerable effect on the plugging performance of nanospheres. The nanospheres have good injectivity, and the intensity variations in small, medium and large pores account for 34.46%, 13.22% and 52.32%, respectively. Overall, this paper explores the feasibility of applying nanospheres for water plugging and enhanced oil recovery.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation on plugging performance of nanospheres in low-permeability reservoir with bottom water

Tang¹,

Wang²,

Deng³

et al. 2022

Adv. Geo-Energy Res.

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“…Crude oil is a mixture of various quantities and forms of organic components such as resin, wax, and asphaltene. Asphaltene is the heaviest and most polar compound of crude oil. − Asphaltene is usually insoluble in normal alkanes and soluble in aromatics. − Any disturbance in the thermodynamic equilibrium of the crude oil results in asphaltene precipitation and deposition. , Changes in pressure and temperature, gas injection, acidizing, and well stimulation are the significant causes of asphaltene deposition. − On the other hand, wax is the paraffinic fraction of crude oil, where its solubility decreases by decreasing the temperature. − As the temperature falls below the cloud point or wax appearing temperature (WAT), the paraffin forms a high-molecular-weight solid wax. Asphaltenes are possible deposits inside the reservoir, near the wellbore region, inside the tubing string, and at the surface facilities; however, wax is rarely deposited inside the reservoir and near the wellbore region as it usually deposits in downstream sections from tubing to surface facilities. − Permeability reduction is the significant consequence of asphaltene and wax deposition inside the reservoir, which results in a considerable decline in production rate. − …”

Section: Introductionmentioning

confidence: 99%

“… 7 , 8 Changes in pressure and temperature, gas injection, acidizing, and well stimulation are the significant causes of asphaltene deposition. 9 − 12 On the other hand, wax is the paraffinic fraction of crude oil, where its solubility decreases by decreasing the temperature. 13 − 15 As the temperature falls below the cloud point or wax appearing temperature (WAT), the paraffin forms a high-molecular-weight solid wax.…”

Section: Introductionmentioning

confidence: 99%

Comparative Static and Dynamic Analyses of Solvents for Removal of Asphaltene and Wax Deposits above- and below-Surface at an Iranian Carbonate Oil Field

et al. 2023

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During production from oil wells, the deposition of asphaltene and wax at surface facilities and porous media is one of the major operational challenges. The crude oil production rate is significantly reduced due to asphaltene deposition inside the reservoir. In addition, the deposition of these solids inside the surface facilities is costly to oil companies. In this study, the efficiency of different solvents in dissolving asphaltene and wax was investigated through static and dynamic tests. The analysis of solid deposits from the surface choke of one of the Iranian carbonate oil fields showed that they consisted of 41.3 wt % asphaltene, and the balance was predominantly wax. In addition, the asphaltenes obtained from the surface choke solid deposits had a more complex structure than that of asphaltenes extracted from the crude oil itself. The static tests showed that xylene, toluene, gasoline, kerosene, and gas condensate had the highest efficiencies in dissolving solid deposits; conversely, diesel had a negative impact on dissolving solid deposits. Static tests on pure asphaltene showed that, among the tested solvents, gas condensate and diesel had a negative effect on the solubility of asphaltene. The dynamic core flooding results showed that asphaltene deposition inside the cores reduced the permeability by 79−91%. Among the tested solvents, xylene, gasoline, and kerosene resulted in the highest efficacy in restoring the damaged permeability, and higher efficiency was obtained with an equivalent solvent injection rate of 1 bbl/min versus 3 bbl/min.

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“…Other studies have focused on changing materials and their parameters and wetting fluid properties to explore the relationship between imbibition characteristics, materials, and fluids. Akbarifard et al 36 demonstrated that fracture networks play an important role in water and gas production in carbonate reservoirs based on the fluid and rock properties of a gas field in southern Iran. More et al 37 discussed the comparison of saturation levels of homogeneous and heterogeneous porous media of different types of sand bodies at different time and distance levels.…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution Law and Mechanism of Fracture Imbibition in Loaded Coal Based on Micro-CT

Yu,

Li,

Gao

et al. 2023

Energy Fuels

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Numerical simulation of water production process and spontaneous imbibition in a fractured gas reservoir – A case study on homa gas field

Cited by 9 publications

References 27 publications

Experimental investigation on plugging performance of nanospheres in low-permeability reservoir with bottom water

Experimental investigation on plugging performance of nanospheres in low-permeability reservoir with bottom water

Comparative Static and Dynamic Analyses of Solvents for Removal of Asphaltene and Wax Deposits above- and below-Surface at an Iranian Carbonate Oil Field

Study on the Evolution Law and Mechanism of Fracture Imbibition in Loaded Coal Based on Micro-CT

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