Influence of natural caves on hydraulic fracturing pressure curves: numerical modelling and ANNs

Matrix acidizing is widely used to enhance oil/gas production in the exploitation of carbonate reservoirs. In this work, a three‐dimensional (3D) hydro‐chemical‐thermal (H‐C‐T)‐coupled model was presented to improve the understanding of the acidizing process. The influence of different influencing factors was analyzed, especially the coupling effect of natural fractures and in situ stress. With the increase in acid injection concentration, the minimum pore volume of acid required for breakthrough (PVBT) decreases. The optimal injection rate and the minimum PVBT increase with increasing initial reservoir temperature. With the increasing initial reservoir permeability, the minimum PVBT increases. With the increasing initial reservoir pore diameter and specific surface area, the minimum PVBT and the optimal acid injection rate increase. When the fracture direction is perpendicular to the direction of the maximum principal stress, the fracture apertures decrease with the increase of the maximum principal stress, which leads to an increase in PVBT and wider paths of wormholes. Lastly, the present H‐C‐T‐coupled model was applied in the context of Tahe reservoir exploitation, which shows that optimizing the acid injection rate is able to enhance the connection between wellbores and natural caves.

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“…Natural caves in Tahe fractured‐vuggy reservoir 56,57 . (A) The shape of caves filled with sediment.…”

Section: The Combined Aifrac and The H‐c‐t Calculation Methodsmentioning

confidence: 99%

Three‐dimensional simulation of the acidizing process under different influencing factors in fractured carbonate reservoirs

Guo

Tang

Qiao

et al. 2023

Energy Science & Engineering

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The hydraulic fracturing with multiple influencing factors in carbonate fracture-cavity reservoirs

Qiao

Tang

et al. 2022

Computers and Geotechnics

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Combining machine learning and physics modelling to determine the natural cave property with fracturing curves

Tang

Qiao

et al. 2023

Computers and Geotechnics

View full text Add to dashboard Cite

Influence of natural caves on hydraulic fracturing pressure curves: numerical modelling and ANNs

Cited by 3 publications

References 41 publications

Three‐dimensional simulation of the acidizing process under different influencing factors in fractured carbonate reservoirs

Three‐dimensional simulation of the acidizing process under different influencing factors in fractured carbonate reservoirs

The hydraulic fracturing with multiple influencing factors in carbonate fracture-cavity reservoirs

Combining machine learning and physics modelling to determine the natural cave property with fracturing curves

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