Author(s)

Jing Huang¹, Binhai Zhang¹, Shujie Liu¹, Yanfeng Cao¹, Heng Xue^2,3

¹CNOOC Research Institute, CNOOC Plaza, Beijing, China.
²China Zhenhua Oil Co., Ltd., Beijing, China.
³Chengdu Northern Petroleum Exploration and Development Technology Co. Ltd., Chengdu, China.

Based on the equivalent permeability tensor theory, a novel carbonate acidizing mathematical model is developed, which can be adopted to simulate the simulation process for carbonate matrix-acidizing and vuggy carbonate acidizing. Wormhole-channel in the core BC21 and BC10 was simulated based on the Omer Izgec experimental data. The comparative result between the experiment and the simulation shows that the two dominating wormhole-channels, the variation of pressure-drop curve and the pressure values at the inlet of the core are almost the same. The acid-flowing channel is significantly influenced by mineral distribution heterogeneity and macropore distribution pattern in the core. The acid breakthrough volume is defined as 1.5 PV divided by pore volume of core (PV is the acid volume consumed to form the dominating wormhole channel.). If the acid is injected continuously while the wormhole has completely broken through the core, the wormhole shape only changes a little, but the end-face dissolution will be formed at the end of the core. And the conclusion could be used to optimize the acid consumption volume.

Equivalent Permeability Tensor, Wormhole, Vuggy Carbonate, Matrix Acidizing, Simulation

Huang, J. , Zhang, B. , Liu, S. , Cao, Y. and Xue, H. (2018) A Novel Model for Carbonate Formation Acidizing Based on Equivalent Permeability. Open Journal of Yangtze Oil and Gas, 3, 167-178. doi: 10.4236/ojogas.2018.33015.