Methods are provided for removing filter cake containing a bridging agent soluble in a carboxylic acid salt from a formation fluids producing zone penetrated by a well bore. The methods basically comprise the steps of introducing in an aqueous carrier liquid a carboxylic acid ester and a base for slowly catalyzing the hydrolysis of the ester and forming a carboxylic acid salt therewith into the producing zone, and allowing the base to catalyze the hydrolysis of the carboxylic acid ester to form the carboxylic acid salt so that the carboxylic acid salt dissolves the bridging agent and the filter cake is removed.
本发明提供了从井眼穿透的地层产液区清除含有可溶于
羧酸盐的架桥剂的滤饼的方法。这些方法基本上包括以下步骤:在含
水载液中将
羧酸酯和用于缓慢催化酯的
水解并与之形成
羧酸盐的碱引入产液区,并使碱催化
羧酸酯的
水解以形成
羧酸盐,从而使
羧酸盐溶解架桥剂并去除滤饼。