Effectiveness of the Acidizing Treatment in Wells Based on the Petrographic Results of Thin-Section Acidizing Experiments

The ac idi zing (reatment is a method usuall y used for Ihe cnhacc menl of produc tivi ty i ll o il-gas fie lds . Treati ng thin -sec ti ons for microscopi c pe trog ra phi c anal yses wit h comm on acid s, establishes the so lubilit y and dispersion o f minerals, as wel l as secondary formatio n damage. The best res ults were achieved by treating carbonale rocks and rocks wilh carbonate const ituents. Si liceolls minera ls, such as q uart? and micas arc nOI dissolved, but the sol ubili l}' o f fe ldspars illcreascs w ith the COl-component in plagioclase ,md thc dcgrce or al te ra ti on. Cl ay minera ls ,tre s ubj ect 10 mec hanica l d is integra tion w hic h causes fUrlher fo rmation damage. Anhyd ri te Hnd o paq ue mine ral s arc insolubl c.