Investigation of Fracture Width Change under Closure Pressure in Unconventional Reservoir Based on the Hertz Contact Theory

Dong, Liang; Wang, Di; Li, Fengxia; Fu, Xiaoxiao; Wang, Miao

doi:10.1155/2021/1268352

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…The study found that high stress causes increased pore blockage, and larger pores are less likely to experience particle plugging. Closure pressure reduction increases fracture width, as it decreases the contact force between fractured surfaces [30,31]. Chen et al used the Brazilian splitting method to create rough fractures and quantified the effect of proppant concentration on the stress sensitivity of artificial fractures by changing gas flow pressure and confining pressure, respectively.…”

Section: Introductionmentioning

confidence: 99%

Stress Sensitivity of Proppant-Containing Fractures and Its Influence on Gas Well Productivity

Chen

Wei²,

Cheng³

et al. 2023

Geofluids

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Formation pressure gradually decreases with fracturing fluid flowback and gas production. Due to the stress sensitivity of the fractures, the permeability of the artificial fractures after fracturing becomes lower, which significantly affects gas well productivity. This paper focuses on two questions: (1) the stress sensitivity of proppant-containing fractures with different roughness and (2) tight gas well productivity considering stress sensitivity. Two types of artificial fracture samples, smooth and rough, are prepared and filled with different proppant concentrations. Then, the changing confining pressure method is used to quantify sample stress sensitivity. On this basis, the productivity equation for the fractured well with finite conductivity that considers fracture and matrix stress sensitivity is derived, and the influence of stress sensitivity on productivity is discussed. The results show that proppant concentration and fracture surface roughness will significantly affect fracture permeability and stress sensitivity; with increasing proppant concentration, fracture permeability increases, stress sensitivity decreases, and well productivity increases; under the same proppant concentration, the stress sensitivity is lower and the gas production is higher for smooth fracture; and when the artificial fracture changes from no proppant to proppant, the productivity of the fracturing well is improved the most.

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Section: Introductionmentioning

confidence: 99%

Stress Sensitivity of Proppant-Containing Fractures and Its Influence on Gas Well Productivity

Chen

Wei²,

Cheng³

et al. 2023

Geofluids

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The characterization of incline-induced flow conductivity in shale’s proppant-packed crack: Lab-scale study

Cao,

Li,

Gao

et al. 2024

Fuel

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Determination of the fracture closure pressure in fractural-cavity carbonate reservoirs using a failure criterion based on asperity behavior

Tian,

Chen,

et al. 2024

Front. Earth Sci.

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As fluid flow paths in fractural-cavity carbonate reservoirs, fractures have a significant impact on the production performance of carbonate reservoirs. In particular, well production depends on the apertures of the fractures, which vary with the effective stress acting on the fractures. Thus, predicting the fracture closure pressure is crucial for carbonate reservoir development. In our research, fracture closure pressures are derived using the Zienkiewicz–Pande failure criterion, which defines the pressure at which most asperities come into contact. The results reveal that fracture closure is influenced by the geo-stress field, rock mechanics, and spatial location of the fracture. Ultimately, the fracture closure pressure of typical wells located in different tectonic zones in the Shunbei Oilfield is calculated, and the results indicate that the fracture closure pressure in the Shunbei Oilfield is significantly affected by the dip of fractures and the angle between the fracture strike and maximum principal stress. To demonstrate the accuracy of the estimated fracture closure pressure, production performance corresponding to fracture closure was evaluated. It reveals that the flowing bottom pressure decreases rapidly and the recoverable oil reserves reduce when the pressure approaches the fracture closure pressure. This observation verifies that the fracture closure pressure determined using our formula is a feasible predictor of the production performance of fractural-cavity carbonate reservoirs.

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Investigation of Fracture Width Change under Closure Pressure in Unconventional Reservoir Based on the Hertz Contact Theory

Cited by 3 publications

References 21 publications

Stress Sensitivity of Proppant-Containing Fractures and Its Influence on Gas Well Productivity

Stress Sensitivity of Proppant-Containing Fractures and Its Influence on Gas Well Productivity

The characterization of incline-induced flow conductivity in shale’s proppant-packed crack: Lab-scale study

Determination of the fracture closure pressure in fractural-cavity carbonate reservoirs using a failure criterion based on asperity behavior

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