Process for Acidizing

摘要

The invention relates to in-situ acidizing processes that involve the dissolution of an acid-soluble material. Treatment fluids have been identified that can effectively dissolve acid-soluble materials at low temperatures, such as temperatures of 30° C. or lower. In some embodiments, the processes may also be usefully employed at higher temperatures. The processes and treatment fluids of the invention can advantageously be used to dissolve acid-soluble materials, including filter cakes, in underground formations.

主权项

1. An acidizing process which comprises:
(a) providing a treatment fluid that comprises dissolved glucono delta lactone; (b) contacting the treatment fluid with an acid-soluble material; and (c) allowing the glucono delta lactone to hydrolyse to produce gluconic acid and the gluconic acid to dissolve at least a portion of the acid-soluble material;wherein during or following the step (c) the treatment fluid comprises a dissolved salt effective for preventing precipitation of alkaline earth metal salts of gluconic acid and/or dissolving precipitated alkaline earth metal salts of gluconic acid.