Matrix acidizing modeling of near-wellbore with reduced reservoir properties (part 2)

Authors: K.A. Turegeldieva, U.K. Zhapbasbayev, B.K. Assilbekov (Kazakh-British Technical University, Kazakhstan, Almaty), A.B. Zolotukhin (Gubkin Russian State University of Oil and Gas, RF, Moscow)

Key words: acid stimulation, damage function, wormhole, Damkohler number

This paper deals with two-scale numerical modeling of the carbonate rock dissolution using hydrochloric acid. In order to account the reduced reservoir properties due to of the near-wellbore zone damage, a special function f_d characterizing reservoir damage introduced in the numerical calculations. The influence of f_d function on process of rock dissolution depending on the Damkholer number is analyzed based on numerical modeling. The optimal regimes of damaged and undamaged carbonate rock dissolution were determined.