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Abstract

An improved acidization solution is provided which comprises water and one or more esters or polyesters of hydroxy acid or of glycerol. The solution may include, for example, ethyl lactate and pure water or a brine. The hydrolysis of the esters or polyesters occurs at a slower reaction rate than that of several other known acidization esters, such as diethyleneglycol diformate, at temperatures higher than 60.degree. C. or even higher than 100.degree. C. Thus, the acidization solution may be distributed substantially throughout a region in a well where acidization is required before hydrolysis is completed, despite being exposed to relatively high temperatures. The hydrolysis may result in the slow release of an acid that is capable of consuming all or most of an undesirable substance in the well, e.g., a filter cake.

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First Claim