Study on acidizing technology and its application in ZJ2 reservoir of Wenchang 13-1/2 Oilfield

Reservoirs of Zhujiang formation in Wenchang 12-1/2 Oilfield are low porous,middle-high per-meable,and loose consolidated and produce sand easily.Based on the damage mechanism analysis on these reservoirs,the MH chemical retarded acid are selected.Laboratory studies indicate that because of its powerful chelating and low surface tension,it can slow down the reaction speed of acidizing rocks and prevent from secondary precipitate,inhibit the swelling of clay solids and remove scale.Two wells（A7,A10） in Wenchang 13-1/2 Oilfield have been treated by this method and gained good effects.