Question: H C l acid solution ( 1 5 % ) is used for an acidizing project to a carbonate reservoir ( Dolomite ) . The
acid solution is used for an acidizing project to a carbonate reservoir
Dolomite The chemical reaction between the acid solution and the dolomite is
shown below. The available information is given below:
CaMg
Depth, D
wellbore radius, rw
Fracture gradient, Gf
Porosity
Permeability
Skin factor
Skin zone radius, s
Reservoir pressure
Reservoir radius, re
Reservoir thickness, perforated
Perforation density
Perforation diameter, dp
Discharge coefficient,
Acid solution density
Acid solution viscosity, ua
Acid friction loss
Specific mud acid volume,
Dolomite density
MwDolomite
acid solution
Fractal dimensionality
Acid diffusivity
It is required to calculate:
Surface injection rate
Surface injection pressure
The injected acid volume and the injection time
The radius of the wormholes
The skin factor after the acidizing
The volume of the reservoir rock that could be dissolved by the acid solution
The new porosity after the acidizing
The stimulation ratio
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