Since matrix acidizing is a low-budget stimulation operation, there has been little incentive to improve acidizing treatments including real-time technology, despite the wide usage of matrix stimulation. Hence, for matrix acidizing real-time quality control, job monitoring and job optimization is seldom practiced and no sophisticated tools were available. However, the ever increasing length of stimulated segments and the associated technical and economical problems in combination with reports on high stimulation failure rates have created an emphasis on the development of real-time tools, not only for monitoring and analyzing acidizing treatment efficiency but also for evaluating pre- and post-treatment job performance. All the tools available today use the evolution in skin factor as a quantitative measure of the overall treatment. For the calculation of the skin factor three methods, based on measuring the injection rate and pressure, are presented. The methods differ widely, from applying a steady-state approach to the fully transient flow regime accounting for various effects influencing the pressure response. Comparisons are presented, based on detailed analysis of the models' features and matching of field data An obvious conclusion is that the fully transient method is the most promising means of real-time monitoring and analysis of matrix treatments for the future.

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