Most of the reservoirs in Mexico are carbonate formations, which produce mainly from high conductivity fractures, the temperature of these fields generally goes above 140 C. Under this combined scenario of fissures and hot environments low rate acid injection generates a very fast mass transfer from acid to the rock, which yields very poor results in terms of production. Good results have been obtained on latest designs when injection rates have gone above frac pressure. The high rate mitigates the combined effect of the high proportion of rock surface area in the fissure to low volume of acid in the rock and the high temperature.

Special acid systems as emulsified systems; organics acid and high strength acid have been used to complement this practice with excellent results. Gelled especial system has helped to obtain a homogenous distribution of the acid in the open intervals.

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