Mechanism, mode, and prediction of karst caves collapse in the deep marine carbonate fracture-cavity reservoir

Lyu, Xinrui; Ju, Binshan; Wang, Bin; Wu, Xingwei; Ding, Yanzhi

doi:10.1016/j.marpetgeo.2024.106978

Marine and Petroleum Geology

2024

DOI: 10.1016/j.marpetgeo.2024.106978

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Mechanism, mode, and prediction of karst caves collapse in the deep marine carbonate fracture-cavity reservoir

Xinrui Lyu,

Binshan Ju,

Bin Wang

et al.

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2024

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Cited by 2 publications

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Fluid cross-flow characteristics of a partially filled cavity in deep marine carbonate reservoirs

Wang,

Ren,

Cheng

et al. 2024

Physics of Fluids

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The analysis of the fluid cross-flow characteristics in partially filled cavities is essential for characterizing the fluid flow behaviors in deep marine carbonate reservoirs. Thus, it is vital for the effective development of crude oil in deep marine carbonate reservoirs. This study presents mathematical models for portraying the fluid cross-flow characteristics in partially filled cavities, considering the effects of gravity, cavity filling degree, and storability ratio. By solving the models using the Laplace transformation and Stehfest numerical inversion methods, pressure transient analysis, and rate transient analysis can be performed on the reservoir, resulting in the evaluation of the dimensionless pressure, dimensionless cross-flow rate, and dimensionless cumulative cross-flow rate in a cavity. The available experimental data adequately validate the proposed models. Moreover, based on the derived model, parameter sensitivity analysis is conducted. Based on the results, the cross-flow characteristics are significantly affected by fluid and cavity parameters. Additionally, as the thickness-to-radius ratio of the cavity decreases, the radial flow becomes pronounced, leading to a more complicated cross-flow process. The derived model not only assists in understanding and predicting the cross-flow characteristics in partially filled cavities in deep marine carbonate reservoirs but also provides guidance for crude oil exploitation.

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Fluid cross-flow characteristics of a partially filled cavity in deep marine carbonate reservoirs

Wang,

Ren,

Cheng

et al. 2024

Physics of Fluids

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Production Law of Shielding Oil in Fractured Carbonate Reservoirs: A Case Study of Northwest Oilfield, China

Li,

Qu,

Zhen

et al. 2024

Processes

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Multi-scale fractures in Northwest Oilfield are extremely developed. Fractures in both oil flow channels and water channels lead to the phenomenon of water channeling in the later stages of reservoir development, which may be affected by the bottom water cone. Gel plugging agents are widely used in the treatment of this phenomenon because of their low cost and high-water plugging efficiency. However, because there is often residual oil in small-scale fractures, the pressure law of different grades of differential fractures on gel is not clear, thus leading to low gel application efficiency and low oil recovery. There is still a lack of effective means through which to understand the regularity of shielding the remaining oil with gel strength and fractures of different grades. In this study, we conducted a novel analysis of the law of shielding oil production in fractured reservoirs. The gelling and rheological properties of anti-temperature gels (ATGs) with different strengths were studied. The plugging rate of oil phase was 96.39%, and that of water phase was 25.37%. ATG showed good oil–water selectivity. The influences of different grades of differential fractures on the production law of shielding the remaining oil were also studied, as well as the corresponding influence law chart. When the gel strength was in the range of 2.0–28.1 Pa and the fracture grade difference was 5–10, the recovery ratio was increased by 10.6–24%. The enhanced oil recovery can be quantitatively predicted by the scale of reservoir fractures and the strength of gel used. It has a certain guiding role for the field application of gel to efficiently shield residual oil in differential fractures.

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Mechanism, mode, and prediction of karst caves collapse in the deep marine carbonate fracture-cavity reservoir

Cited by 2 publications

References 14 publications

Fluid cross-flow characteristics of a partially filled cavity in deep marine carbonate reservoirs

Fluid cross-flow characteristics of a partially filled cavity in deep marine carbonate reservoirs

Production Law of Shielding Oil in Fractured Carbonate Reservoirs: A Case Study of Northwest Oilfield, China

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