Acid Fracturing Treatment in an Iranian Carbonated Reservoir

1959 Words Feb 22nd, 2018 8 Pages
An acid fracturing treatment must produce a conductive flow channel long enough to alter the flow pattern in the reservoir from a radial pattern to one that approaches linear flow. This needs high rate of acid flow completed with formation solution in acid.
Considering the above restrictions imposed by acid fracturing, its applicability is limited to special cases where no better solution is available especially in Iranian oil fields. In this paper, one of these special cases is studied occurred in a carbonate reservoir in Iran. This was the first successful acid fracturing operation in an Iranian reservoir which makes the condition so delicate and unique as there was so many uncertainties and lack of experience.
As we know, hydraulic fracturing has been used worldwide in damaged formations and formations with low conductivity but performing acid fracturing has been limited to so many operational and reservoir restriction. The main difference between acid fracturing and proppant fracturing is the way fracture conductivity is created. In proppant fracturing, a propping agent is used to prop open the fracture after the treatment is completed. In acid fracturing, acid is used to etch channels in the rock that comprise the walls of the fracture. Thus, the rock has to be partially soluble in acid so that channels can be etched in the…
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