Parametric Wormhole Studies on Matrix Acidizing Carbonate Reservoir

Teodoro Marcos Mota; Sudjati  Rachmat

Teodoro Marcos Mota Dili Institute of Technlogy
Sudjati Rachmat Institut Teknology Bandung Indonesia

Keywords: Well stimulation, matrix acidizing, skin, wormhole, fractal, equivalent hydraulic radius.

Abstract

Matrix stimulation is one of the key intervention treatments that is performed to increase well productivity in carbonate formation reservoirs. Stimulation using matrix acidizing can cause a wormhole around the well so that it can increase the permeability around the wellbore which results in decrease of skin values. Wormholes are channels that resemble natural fractures that have very large permeability. Wormhole is the formation of branched holes in formation as a result of acidizing treatment. Skin is a barrier factor that affects the rate of production. Skin is an area of formation that is damaged. Skin formed around the wellbore. If it’s positive value mean the area near wellbore is damaged and negative value if the area was improved or stimulated. In this research, by knowing the value of acid volume, permeability ratio (k/ks), porosity of the original formation, fractal dimension and acid injection rate, calculations were performed using the equivalent hydraulic radius concept and making a plot to see the effect on skin factor and productivity index (PI). The indicator of the success of implementing acidizing stimulation can be seen from the decrease in skin factor, increases in well productivity (productivity index ratio) and increased production rates.

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References

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