首页|The effect of temperature, natural fractures and vugs on the acidizing process in fractured-vuggy reservoirs with hydro-thermal-chemical coupled modeling
The effect of temperature, natural fractures and vugs on the acidizing process in fractured-vuggy reservoirs with hydro-thermal-chemical coupled modeling
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Matrix acidizing is a common stimulation measure used for carbonate reservoirs in the petroleum industry. Carbonate rocks are characterized by rich fractures and vugs, however, limited work has been done to date to examine the effect of fractures and vugs on the carbonate acidizing process in three-dimensions (3D). In this paper, the temperature and vugs with high porosity are introduced into the two-scale continuum (TSC) model. The 3D radial fractured-vuggy carbonate acidizing process is simulated using the present hydro-thermal-chemical (H-T-C) coupled model. The sensitivity of temperature, natural fracture and vug parameters on the acidizing process is evaluated. The results show that a high-temperature significantly improves the optimal injection rate of the acid. The existence of fractures and vugs significantly reduces the amount of acid consumed as the acid breaks through the formation. For fractures of the same direction, with the increase of fracture number and fracture length, the normalized initial pore volume (PV_(BT)) is reduced first, and then stabilizes. For intersecting fractures, there is an optimal number and length of fractures with the minimum PV_(BT) value. Furthermore, an increase in the vug size reduces the PV_(BT) value. There is an optimal number of vugs with the minimum PV_(BT) value. Finally, some possible extensions of the current work are discussed.
Hydro-thermal-chemical coupledTwo-scale continuum modelFractured-vuggy carbonatesThe acidizing process
Linbo Zhou、Anbang Guo、Xiaoguang Wang
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Sinopec Research Institute of Petroleum Engineering, Beijing, 102206, China
The Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, 430072, China
College of Energy, Chengdu University of Technology, Chengdu, 610059, China
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